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by Nexus Sannin

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8. Sz

3PeopleInACoat

Izuku is down in the dumps - his mother and father divorced, and now his father has married a woman half his age and twice Izuku's. But Rumi proves to be a great stepmom, showering Izuku with love and affection. Years later, however, Rumi and Izuku find themselves alone in the house, Rumi in the midst of her heat, and Izuku's starting to look a little ... too appetizing ...

Notes

... I'll be real with you guys, this idea wouldn't leave my head until I wrote it out. This is no

doubt one of the worst things I've ever written. I can't believe I worked so hard on this.

3PeopleInACoat

Izuku is down in the dumps - his mother and father divorced, and now his father has married a woman half his age and twice Izuku's. But Rumi proves to be a great stepmom, showering Izuku with love and affection. Years later, however, Rumi and Izuku find themselves alone in the house, Rumi in the midst of her heat, and Izuku's starting to look a little ... too appetizing ...

Notes

... I'll be real with you guys, this idea wouldn't leave my head until I wrote it out. This is no

doubt one of the worst things I've ever written. I can't believe I worked so hard on this.

Enjoy.

My New Stepmom

Chapter Notes

See the end of the chapter for notes

Izuku Midoriya had only been ten years old when his mom sat him down in their kitchen to patiently explain that his parents were getting a divorce.

He hadn't really gotten it at first, never really considering the possibility that his parents could really divorce - but as Inko explained that his parents had just simply fell out of love, and his father had found love somewhere else, he had felt a spike of anger in his chest. Anger was never really his thing, usually preferring to bottle it up inside and never address it - something that he had plenty of experience with, given his status as a quirkless nobody - but anger at his dad, anger at this woman taking away his happy family, almost made him lose control. He didn't even listen when Inko explained that his father was going to bring this new woman he was dating over to introduce her to him.

Izuku had went to his room, slamming the door shut and huddled on the bed, blinking tears out of his eyes as he ignored his mom knocking on the door, worried. First he was diagnosed quirkless, then he was bullied in school, now he has to deal with his mom and dad divorcing?! He felt so miserable, he started to cry, huddled under his sheets and trying not to let himself be overheard by his mom - they didn't need to flood the apartment again with both of their tears.

Hours went by, while Izuku cried miserably, and he did not hear the doorbell ring, and the door open. He didn't hear the huddled whispers as Inko tearfully explained that Izuku wasn't taking the news well, and he did not hear an unfamiliar voice asking to speak to him alone. He did hear, however, his door slowly and quietly open. The room was dark, so the only light came from the outside hallway, illuminating a woman he didn't recognize as he peaked out of his bedsheets covering his body.

"Hey," she asked, her voice deep but surprisingly youthful-sounding, "you're Izuku, right?"

He let out a smaller sob, bundling deeper into his makeshift fort. The woman slowly walked forwards, pulling the desk chair out and sitting down on it, facing his bed.

"My name is Rumi," she patiently said, leaning forwards a bit so she could see him a bit better. "I'm ... I was wondering if you'd like to talk to me for a few minutes."

Izuku, still teary-eyed, wanted to tell her to get lost, get out of his room, but even when he was angry and hurt, his manners got the best of him. He let out a small sniffle, and sat up in the bed, rubbing the tears off his cheeks, and brought down the blanket down so he could turn to face her. He expected some nice looking woman, or someone in a skirt and dress-shirt, someone professional looking like his dad was whenever he went to work.

He was not expecting this, though.

The first thing that stood out to him were her bunny ears, pointed high above her white hair with a slight crook. Her skin was dark, much darker than he was expecting, and she had a pair of sharp red eyes looking at him, her lips curled in a warm smile. She looked like an athlete, her sleeveless arms muscular. She was dressed ... Izuku had to blink to make sure he was seeing this correctly, but she was dressed ... like a hero. She was wearing a white leotard, a yellow crescent moon over her chest, with two metal plates above her hips. Her legs had purple thigh-high boots, and there

were plates on her feet, looking like the feet of rabbits.

She was ...

She was ...

"You're ..." Izuku whispered, looking at her in wonder, "you're a hero?"

"Yeah," Rumi smiled, nodding. She did wince a bit, though, "I probably should've gotten changed before I came here - I just got off my shift. It's not weird, right?"

"You're a hero."

"Er ... yeah," Rumi nodded again, looking concerned.

"I - but - you - I've never - I've never seen you before," Izuku said, curiosity and wonder making him get up to sit on the edge of his bed, facing her properly - his previous angry thoughts about his parents getting divorced forgotten temporarily.

"Well, I'm pretty new," Rumi explained with a grin, flexing an arm. "I just hopped into the business! Your dad's acting as my sponsor, helping me get up in the rankings ... it's kinda how we met, actually," she confessed, going a bit red. She then saw Izuku's wonder and amazement suddenly fade as he thought of something. "You okay now, kid?"

"Y-yeah, it's just ..." Izuku muttered a bit, rubbing a hand through his green hair, and then asked, in a quiet voice, "I was ... wondering how old you were."

"How old I'm ...?" Rumi blinked, a bit confused, before she realized what he was talking about - of course, his dad was in his thirties, he was wondering why she looked so young. She let out a small laugh, and gave Izuku a teasing grin. "You know it's rude to ask a lady her age, kid?"

"Erk!" Izuku went red, immediately whipping his head to the floor, muttering apologies left and right. Rumi let out another laugh, and pointed a finger to herself.

"I'm just messing with you. Truth is, kid, I'm only twenty years old," she explained, and Izuku's gaze turned back to her. "I met your dad a few months ago, and we fell in love. I'm ..." she sighed, and leaned back in her chair. "I'm sorry that your parents ... they fell out of love. I hope that doesn't give you a bad impression of me."

"Um, I don't ..." Izuku muttered, and Rumi raised an eyebrow.

"I'm telling you, kid, speak up your mind," she said sharply, and Izuku jumped a bit. "I prefer to speak with someone who isn't afraid to speak their mind. You can be honest with me, kid, I won't get mad."

"Er - I don't ..."

"C'mon, spit it out!" Rumi encouraged, leaning forward and nodding. Izuku gulped a bit, looking anywhere but her, but finally, he did speak up.

"I'm ... actually kinda mad. And sad. At you."

"I get you," Rumi nodded, smiling a bit. "I'd honestly get pissed if some woman came into your life without warning and messed things up. Tell you what, though - I wanna make a deal with you."

"A - a deal?" Izuku asked, looking back at her smiling in encouragement. "What's that?"

"I wanna get along with you," Rumi told him, a look of guilt on her face, "and I know that I probably hurt you a lot today. I wanna make up for it. If you want to, I can give you my phone number - something for you to text me with. I'll answer you, and we can talk about anything you want."

"A-anything?"

"Anything!" She nodded. "What's up, what you did at school, heroes, the works. Just ... maybe lay off All Might," she laughed a bit, looking around. "Seems that you really like him."

Izuku squeaked at that, but before he could apologize (for what, he didn't know), she pushed a hand out to him, offering to shake.

"And you can call me Rumi, if you want," she said kindly, and Izuku stared down at the hand. She had taken off the glove, so her calloused but kind looking hands could be visible. He hesitated for a few moments, looking up from her hand to her face, seeing that confident grin on her face. And slowly, he offered his hand and took it in a handshake.

"Okay," he whispered, giving her a wobbly smile. "Awesome," she grinned. "Let's get along, Izuku."

Two years later, Rumi and Hisashi had gotten married, and Rumi was officially Izuku's stepmother. There were a few raised eyebrows in the hero community for Rumi marrying a man a decade her senior, but they wisely did not comment on it - Rumi had gotten a reputation for kicking whoever insulted her family into the sky. She slowly rose through the rankings, starting to become a household name as the well-received Rabbit Hero Miruko.

She had seen Izuku a few times during the two years - while her hero life kept her busy, and Hisashi was forced to return overseas to continue working, she was sure to visit him a few times a year just to make sure he was okay. She was more than happy to sit down with the kid and talk about her hero work, eagerly boasting about the fights she had gotten into while Izuku listened with a look of reverence on his face. While All Might was and forever his favorite hero, he had to admit that his new stepmother was slowly rising in those ranks - although he still hesitated to call her mom - that title belonged to Inko.

Speaking of Inko, despite what Izuku initially feared, she welcomed Rumi into the family with open arms, as though Rumi wasn't the new missus. The two would sit in the kitchen and laugh, gossiping, and Inko would almost faint from fear whenever Rumi laughed about the fights she had gotten into over the years. Rumi had been present for both of Izuku's birthdays, giving him autographs from heroes that Izuku had never seen before, and she had quickly gotten all too used to Izuku's bursting into tears at the drop of a hat.

Although, Rumi couldn't be there all the time, and wouldn't be there. Such as now, with Izuku, now twelve years old, being slammed into a chain-link fence by Katsuki while his cronies crowed and laughed behind him.

"I heard that you've been looking at hero schools for high schools," Katsuki growled, tightening his grip on Izuku's shirt and starting to burn. "What the fuck did I say you were supposed to do, Deku?"

"I -" Izuku gasped out, cringing at the heat.

"I told you, time and time again, I am going to be the only hero coming out of this shitty school. It's

part of my origin, the thing that people will note for years after they learned that I went to U.A!" Katsuki yelled, shoving his face into Izuku's and screaming straight into his face, spit flying.

"I - I know, Kacchan, but -"

"But you never fucking listen!" Katsuki's angered face was suddenly replaced by a ferocious grin, sneering straight at him. "Your quirkless ass keeps thinking that you can still be a hero! How fucking pathetic are you?! Plus, you already know what happens when you don't fucking listen!"

Izuku cringed, closing his eyes tightly in anticipation as Katsuki laughed loudly and drew his fist back, reading to knock Izuku into the dirt -

"Oi! Brat."

The middle-schoolers jumped and whirled around, seeing Rumi glaring at them while crossing her arms, leaning up against the post. She was dressed in a white dress shirt and caramel jeans, her hair tied up in a bun, so she wasn't instantly recognizable, even with the darker skin and white bunny ears. The boys gulped when they saw her, though - she was tough but very hot, staring at them like they were scum.

"Oi, beat it," Katsuki grunted, throwing Izuku to the ground as he turned to face her.

"I don't think so, brat," Rumi said coldly, getting up and walking over. "I wanna know what you think you're doing with my stepson."

"Your stepson?" Katsuki blinked in confusion, which only increased when Rumi bent down to help Izuku up.

"You good, Izuku?" she asked softly, brushing some dirt off his middle-school uniform.

"I'm - I'm okay, Rumi," Izuku tried to brush her off, shaking his head. "And - and it's okay! We're just -"

"You're just getting beat up," Rumi snapped, her eyes narrowed while Izuku quickly shut up, staring up in fear at her, "don't try to pass this off as rough housing. I've been in my fair share of scraps to know this ain't anything friendly. And you, brat," she suddenly whipped her gaze around at Katsuki, who was about to turn around to leave. "Stay right where you fucking are."

The other guys gulped again, and decided wisely that this was the time to make like trees and get out of there, running away as fast as they could as Rumi slowly stood up, helping Izuku to his feet.

"Eh?" Katsuki narrowed his eyes. "Why the fuck do I have to listen to you, bitch?"

"'Bitch'?" Rumi scoffed, standing up properly to face him and smiling. "Y'know, if this were anything different, I'd take that as a compliment. I value people who don't mince their words and speak their minds."

"Whatever."

"But you were just beating Izuku up," Rumi's smirk fell off her face, glaring hard at the blonde boy. "So now you've gotta face some good old consequences."

"Ha? What fucking consequences?" Katsuki sneered. "What the fuck are you gonna do? Complain to my mom?"

"Huh. Y'know what, I think that is what I'm going to do." Rumi nodded, and Izuku cringed as she squared her shoulders, sneering up at him this time - the boys starting to go through puberty were starting to get taller than her, although this did not diminish her intimidating aura. "Izuku, he live around here?"

"Uh ..." Izuku gulped, and Katsuki's gaze whipped to him, silently sending him a death glare if he tattled.

"Don't look at him, answer me." Rumi reminded him, turning around to glare up at him, her short stature doing nothing to diminish how intimidating she looked. "Does he?"

"Uh ... I ... yeah. Down ... down that way." Ashamed, Izuku pointed.

"Huh. Not far from your mom's apartment." Rumi nodded, and gestured with her head. "Alright, Kacchan, let's go."

"Don't fucking call me that! It's Katsuki Bakugou!"

"Alright, Katsuki Bakugou," Rumi said his name in a mocking way, and with a burst of super- speed, sped over to where he was standing and grabbed his ear. While Katsuki screamed and blew sparks with his hands, Rumi rolled her eyes and dragged him down the street, intending to go straight to his house. Izuku, nearly paralyzed with fear about what was happening, was quick to run up to Rumi, trying to convince her that it was okay, but his stepmother did not listen, scanning the names of the houses to find Bakugou's. Rumi was very enthusiastic to get this done; she had heard about the Bakugous from Inko, so this confrontation had been inevitable.

When she did finally find his house's plate, Rumi nodded again, and walked down the front yard. At this point, Katsuki's yelling had attracted some attention, and the door opened to reveal Mitsuki, staring in shock at them.

"Katsuki?" She turned her gaze to Rumi, who nodded up at her, and Mitsuki's face twisted in rage, seeing her son being pulled around by a complete stranger. "Wh- what the fuck's going on?!"

"Yo!" Rumi raised a hand in greeting, throwing her a grin. "I'm Izuku's new stepmother. I wanted to talk to you about your son's behavior."

"Oh! You must be Rumi!" Mitsuki's initially angry look faded off her face at once, smiling at her and jogging down to shake her hand. Rumi shook her hand enthusiastically, and let go of Katsuki's ear so she could bow properly. Even if she was abrasive and rude, Rumi knew it was nice to make first impressions with Inko's friends.

"That's me," Rumi nodded, and stood up properly. "And I'll let your kid know I'm also Miruko. Y'know, top 20 hero?"

Katsuki's rage-filled face faded off his face at once the moment he heard that, his initial intentions to tell her to go fuck herself immediately leaving him the moment he realized he had been caught bullying stupid Deku by an actual pro hero.

"So," Rumi cracked her neck. "I don't wanna make this very dramatic, but do you mind if I tell your son what'll happen if he bullies Izuku again?"

"Oh, go right ahead!" Mitsuki nodded, standing back and crossing her arms. She was going to enjoy this.

"Awesome!" Rumi nodded, and turned to face Katsuki. "Now, brat," she started, "I caught you

bullying my stepson while waxing on about how you'll be this great pro hero. I'm gonna tell you, that shit's not gonna fly. I might not be some top 10, but I've got enough clout going for me right now to make sure you got utterly no chance of entering any hero school, let alone U.A."

Katsuki's temper flared. "You can't fucking - "

"That's why," Rumi interrupted, continuing to glare up at him, "I'm giving you one last chance, brat. You leave my stepson alone, don't even fucking look at him, and I'll overlook this. You do it again, though? I'll make sure that you can't even dream of being a hero. I'll make sure you work at some burger joint for the rest of your life. And you won't be able to blame Izuku - 'cause news flash? That'll be your fault. You got me?"

The blonde grit his teeth, glaring away from her. That didn't satisfy Rumi.

"You got me?"

"Yeah." Katsuki's answer was short.

"Good." Rumi nodded, and then turned a genuine smile to Mitsuki. "Although I wish the situation was a bit better, it was really nice to meet you. I'll be sure to be around sometime so you, me, and Inko can go for coffee."

"That sounds nice!" Mitsuki said enthusiastically, nodding.

"Great!" Rumi smiled. "Izuku!" The boy, who had been paralyzed in fear while Rumi threatened Katsuki, jumped when his stepmother whirled around, smiling at him. "Threatening people makes me want somethin' sweet. I want some fucking ice cream! C'mon, I'm buying."

Wordlessly, Izuku followed her out, not looking back at Katsuki, who looked like he was about to explode out of rage, or the shit-eating grin Mitsuki had on her face. They walked in silence for about two minutes while Rumi tapped her phone, grumbling and trying to find the nearest ice cream shop. Izuku fell into a silence for a bit, before he sighed and shook his head.

"You ... you didn't need to do that."

"Huh? Do what?" Rumi looked up from her phone, turning to her stepson. "Tell that little brat to get his shit together? If I hadn't, no one would've."

"I ... I do appreciate what you did," Izuku sighed, looking away, "but ... but he was right." "Huh? Right about what?"

"About me ... not being cut out to be a hero. You ... you know I'm quirkless. I can't exactly do what you can."

"Why the fuck not?" Rumi scoffed. "I might be strong as fuck because of my quirk, but what about Eraserhead? He pretty much fights quirkless, he just makes other people quirkless too."

"I ..."

"Or what about that Midnight chick? She's got the knockout gas, sure, but she's nothin' without that. She pretty much fights quirkless. So you wanna know what I think?"

Izuku stared down at Rumi, puberty starting to make him taller, but his attention was on her as she gave him a shark-grin, nodding in approval.

"Screw what Bakugou said. You can totally be a hero."

"I ..." Izuku blinked unexpected tears out of his eyes, and his voice shuddered. He couldn't help crying out, tears leaking onto his cheeks as he put a hand over his mouth, sobbing and grabbing his jacket in one hand. Rumi blinked in panic as her stepson broke down, reaching out unsurely as he bent his knees slightly.

"Wh - whoa, you okay, Izuku? Did I say something wrong?"

"N-no," Izuku shook his head, and managed to get himself under control. He stood up properly, and gave her his best grin. "I just ... I've always wanted someone to say that."

Rumi's smile returned, and she wrapped an arm around his shoulders, squeezing gently. "Then I'm glad it was me, kiddo. Now let's go get some fucking ice cream. After that, though, I gotta talk to your mom - I'm thinking that we need to start talking about some therapy. Your self-confidence is kinda shit."

Izuku laughed a bit, and nodded. "I - sure, Mom."

The two walked off into the sunset, Rumi still looking around for ice cream shops, but even she couldn't help the wide grin on her face as she realized something, while Izuku wiped his tears from his cheeks.

He ... he called me Mom.

Several years passed, and Rumi rose in the rankings as a pro hero, Izuku proudly behind her as she finally broke the top 10 at number 5. During that time, Rumi had offered to let Izuku stay at her place, an apartment with a mini-gym and pool, and help train him to get in shape. Izuku, with permission from his mom, went to and from the place, eventually calling her apartment his home

as well. Rumi and Inko still got along well, going out for coffee with Mitsuki and laughing about how Katsuki was clearly struggling to keep his stupid nose out of Izuku's business. Izuku also began seeing a therapist, intending to help him get some self-confidence back and stop seeing Katsuki in such a good light. Through time and effort, Izuku became much more confident and self- assured, much to everyone's relief. Hisashi would occasionally come home, spending his nights with Rumi due to a certain situation with her quirk, and she appreciated her husband helping her out in her trying times, even if he wasn't there at most points in the year.

Once Izuku's final year of middle-school came around, an unexpected development came. Izuku had gotten in trouble with a slime-based villain, and got an offer from some scrawny man to help train him for U.A. Rumi and Inko gave their permission, and Rumi helped train Izuku at the trashed beach with the old man, Toshinori, encouraging him to go harder. Although Izuku would struggle, and sometimes fall, he eventually completed his training, and applied for U.A. To everyone's delight, Izuku developed a quirk during that training, and his life at U.A., and his lifelong dream of being a hero, began in earnest.

The years passed by, and after several close encounters with villains (Rumi nearly lost her arm to a Noumu during a raid; thanks to Izuku's insistance that she cut out the lone-wolf bullshit, she learned to wait for backup and managed to only walk out of there with a broken elbow), the League of Villains was defeated, Izuku graduated, and was now attending university. Rumi, meanwhile, continued climbing the ranks towards the top, eager to fight it out with Best Jeanist and Edgeshot for the position of number one.

Right now, though, Rumi was in her apartment, grumbling and cursing as she texted Hisashi,

wearing a tank top and leggings. It was around seven at night, and he was supposed to be home from the airport by now, so he could help her handle the worst part when it came to her quirk, but she didn't have anything. She was about to give up and go lift some weights, but the door to her apartment jingled, and she looked around to see Izuku opening the front door.

"Hey, Mom!" He said cheerfully, and Rumi felt a smile blossom on her face. Izuku had gotten even taller during his time at university, filling out his clothes more. He was at least as tall as his friend Shouto now, and had the muscles to compare. She wasn't surprised to see him, however - his university was going into its reading week, so he had the next day and a bit off.

"Hey!" She nodded, and moved to hug him, squeezing him gently. As he moved out of the way, she noticed that he wasn't alone. Behind him was a girl with long white hair, looking a bit condescending at her. She had a monocle on, for Christ's sake, so Rumi automatically knew that this girl was full of it.

"Oh! Mom, this is Saiko," Izuku introduced them, and Saiko loftily bowed. "She's my girlfriend from university."

"Nice to meet you," Rumi nodded, "make yourself at home."

"I will," Saiko nodded snidely, and Rumi fought down a bolt of annoyance.

"We're just going to go to my room for a bit," Izuku explained, blushing slightly. "Saiko's gotta get back to the campus by tomorrow before break's over, but since Dad's coming home, I thought I'd stay the day! Would that be okay?"

"It's more than okay, Izuku," Rumi nodded, smiling, although there was a part of her that was cringing - she kinda had important plans for tomorrow that weren't exactly family friendly. Speaking of that ... "Although, your dad's supposed to be back from the airport by now. I'm gonna go call him," she pointed to her room. "Just yell if you need anything."

"We will!"

The two young adults went to Izuku's room, and Rumi rolled her eyes. If Izuku wanted to bang his girlfriend at his stepmother's apartment, he didn't have to pretend to sneak around doing it - she was the one who encouraged him to date more than Hisashi and Inko, telling him to get out there and get some girlfriends. After the last few, including that Momo girl, Camie and Mei, hopefully he'll figure out what exactly he was looking for.

Entering her room and sitting on the bed, Rumi dialed Hisashi's number and brought it to her ear, hoping he picked up. It took a few tries, waiting for him to pick up, but thankfully, he eventually did, and Rumi was enthusiastic to hear from him. She wasn't very enthusiastic when she heard why he was late, though.

"What do you mean, you're still in America?!"

"I'm sorry, Rumi," Hisashi apologized, "but the boss got me to do some overtime, so I might not be

back for a week."

"Hisashi, this -" Rumi lowered her voice, trying not to sound too loud so Izuku and his girlfriend would overhear. "You know what week this is. I need you back here!"

"I know, honey." Hisashi sighed. "It's - it's just that, I couldn't get away. Will - will you at least be okay without me?"

"I ..." Rumi sighed, "Okay, fine, I - I get it. I'll just ... I'll just get through my heat without you this year."

"Again, I'm really sorry, Rumi," Hisashi apologized again, at least sounding pretty guilty. Rumi sighed, scratching her ear.

"It's really fine," she shook her head. "I'll just - use my vibrator or something. I'll figure it out." "Okay," Hisashi sounded a bit relieved at that at least. "Give my regards to Izuku, okay? I love

you."

"Love you too, dear," Rumi made a small kissing noise into the phone before hanging up, sighing again and throwing the phone across the bed, laying down and throwing her hands behind her head. God damn it! This was bad. Every year, Rumi's heat would hit her, and it would be bad. The combination of her parents' quirks made the heat almost unbearable. And now she was facing an entire heating session alone, for the first time in years. She was going to crash hard.

Rumi usually had Hisashi with her to go through her heat session - while he didn't have a lot of stamina to keep up with her, thanks to the side effect of her quirk, he usually really helped her out, getting her through her heat in the first day - just a long day dedicated to her. But now? With just a stupid vibrator to help her? This was going to take days. And she had that stupid speech to give at the children's hospital on Monday! How was she supposed to face kids while she was dripping wet through her hero costume?!

If only Hisashi would somehow get home, Rumi pouted as she got up from the bed, exiting their bedroom and walking downstairs to grab something to drink. She could already feel her heat starting - the urge to breed, while not as strong yet, was steadily there, stirring in her loins. It wasn't like she couldn't masturbate - her dad's goddamn quirk combining with her mom's meant that when she was in heat, it started to actually burn if she didn't cum after a while. Even now, she was starting to think of sex, opening the fridge and grabbing a water bottle, and grumbled as she unsealed the cap and took a large drink. She didn't want to have to deal with that heat by masturbating - she'd have to take the whole week off at this rate, she'd be too distracted by her urges to properly concentrate on fighting villains.

Stupid Hisashi! Stupid work! Rumi cursed them out while grumping, staring into the fridge without really looking for anything. Stupid vibrator, stupid heat, stupid -

"Oh, hey Mom."

Rumi jumped a bit, surprised, and whirled around to see Izuku standing at the counter, apparently just coming back from his room. She was almost about to say hello, ask him what he was up to, when she caught sight of him properly ... seeing him shirtless and sweaty. Wet hair clung to his face, sweat shining against his muscles, his arms scarred but still nice to look at. It was an image she'd seen plenty of times - she had trained the kid, after all, as a part of being his stepmom she took part of his training - so it shouldn't be any surprise to see him like this.

But ... but oh god ... suddenly Rumi found herself tongue-tied. The sight of Izuku's pecks stood out to her, coupled with the sweat pouring down them, they looked almost delectable. His face, while still having a bit of babyfat, had slimmed slightly, showing a strong jawline. His arms were double the size of hers, looking like he could carry her easily - and he could, knowing this from experience sparring with him - and his legs looked like they could crush her head. HIs lips, soft and inviting looking. His beautiful green eyes, staring at her. And ...

... and his smell. Rumi's animalistic instincts picked it up almost immediately - the smell of

aftermath. He'd been - he'd been fucking right now. Probably that Saiko chick upstairs. It made sense, Izuku was a growing boy, hell, she encouraged him to start having sex with others girls, the memory of him going on that date with the Camie girl came to mind years back. But now ... standing in front of her now, while her heat slowly but surely began ... Rumi froze in spot, staring up at her stepson while feeling heat course through her. She felt her heat shift its focus, away from anger at Hisashi ... and straight onto Izuku.

"Uh ... Mom?" Rumi jumped slightly, blinking, and seeing Izuku looking concerned. "Are you okay? I've been calling your name for a bit now."

"O-oh! Y-yeah, I'm fine, squirt," Rumi laughed, a bit nervously, and rubbed a hand through her hair. Izuku nodded, satisfied, and began walking towards the fridge. As he walked forward, Rumi felt herself shake a bit - even the sight of him coming towards her sent a shot of heat into her loins. She quivered, and watched as Izuku moved to grab his own water bottle, uncapping it and bringing it to his lips. Rumi stared as though in a trance as he slowly gulped down his water, the way his throat moved almost making Rumi leap forward to latch her mouth against it.

Before she could, thankfully, Izuku lowered the bottle, empty, and wiped his lip.

"So, there anything you want to do tomorrow before I go back?" he asked, leaning slightly against the counter while Rumi tried to snap herself out of her little fixation on him. "I've gotta be back by Monday afternoon, so if you wanted, we could do something."

"O-oh, that's - that's okay, Izuku," Rumi tried to say, turning away to look back in the fridge. Oh, god damn it, why, why, why was this the weekend Izuku had to come home?! "I'm sure you - you'll wanna visit your mom."

"Er - I already visited her today, actually," Izuku admitted, scratching the side of his head sheepishly. "I was in the neighborhood, so I decided to drop by. She and All Might are going on vacation, though, so I couldn't stay long. Ah, well, that means I can hang out with my other mom!"

Izuku, god, please don't, Rumi silently begged him, but couldn't do anything but nod stiffly, giving him a small smile.

"Y-yeah," she said weakly. "Just you and your mom."

"Ooh! If you want, we could do a bit of quirk analysis!" He said excitedly, and Rumi tried hard to let out a small laugh at the child-like enthusiasm coming from him - even standing here like the man he had become, he hadn't changed much. Rumi nodded, and Izuku's grin grew.

"Awesome!" he cheered, and walked over and wrapped his arms gently around her, bringing her in for a hug. That's what he's always done, and something she's used to, having been his mom for years now.

But in the midst of her heat? And suddenly realizing he was hot? Oh, fucking god, this was agony. Rumi had to consciously fight not to bring her arms around him, or she might break and drag him up to her room. With all her might, she resisted, and Izuku eventually let go, smiling down at her as he reached to grab a new water bottle, taking it with him and going back up to his room.

Standing frozen in her kitchen, Rumi grunted and shook her head, trying desperately to get her mind off of Izuku. No, no, no, no, no, that was a road she was not going down. It was one thing to think of cheating, something that she would normally detest - no, the fact that her heat decided to target her stepson, someone she viewed genuinely as her own flesh and blood, and make her want to fuck him into the fucking ground.

Groaning, Rumi went to the gym, quickly grabbing some weights and starting to do some lifts, grunting from the exertion, trying to take her mind off of Izuku. As her mind wandered, she tried hard to convince herself not to go through with what her heat was demanding - especially, considering the other side effect of her quirk ...

"Thank you for joining us, Mrs. Usagiyama," the doctor had thanked Rumi's mother back when she was fifteen. Her mother glanced anxiously at her daughter, who was quivering in place, shaking and unable to stop herself.

"We did do an analysis of Rumi, and we may have discovered what's going on," the doctor pointed to his notes. "So you did say that your quirk is rabbit-related, right? With heat?"

"Er - yes," Her mother confirmed, glancing at Rumi. "My heat is usually in the spring, but thanks to my husband's quirk, we can get it under control. His pheromones usually make me focus only on him."

"Yes, and I believe that's the problem," The doctor sighed. "It may be possible that your quirks combined, and Rumi developed an unknown mutation. While her quirk is primarily Rabbit, she may have also developed your husband's pheromone-related quirk. After study, I believe that rather than spread it as a gas, like your husband, she can only transfer the pheromones through lip contact."

"What ... what does that mean?" Mrs. Usagiyama looked fearful.

"It means," The doctor sighed again, "that if Rumi is in heat, and does kiss someone ... it may be impossible to stop them until Rumi's heat is satisfied. Due to this, I would recommend that Rumi takes a week off when heat comes around, and definitely do not kiss anyone during the heat - there are high chances that she'll catch a disease or get pregnant."

Rumi let out a yell as she threw the dumbbell away, cursing and grabbing her shoulders. The doctor had been right - her father's quirk had combined with her mother's, and she had the pheromones. If she kissed anyone during her heat, they wouldn't stop fucking until Rumi was satisfied. Hisashi knew about it, one of the things she'd explained to him when they started dating, and had

consented to using them on him - it was how he helped her through her heat.

But now, she was alone. And Izuku looked like he would be there all day tomorrow ... with her heat specifically targeting him ...

Rumi cursed, and threw her towel away, heading back up to her room. She had reached the kitchen, hoping that she charged the batteries in her vibrator, and hoped that Izuku wouldn't be looking to do much with her tomorrow - when she heard it. Thanks to her sensitive animal instincts, she had much better hearing than normal, and could pick up sensitive sounds, just like her nose earlier.

And now, she heard ...

... the sound of a bed creaking.

Rumi froze, staring at the hallway where Izuku's room would be, and she cursed out loud, shaking her head. No chance, there was no chance in hell she was going to go there. Even in her heated state, where Izuku, the kid who she treated like her son, looked more appetizing than anything she had ever seen before, she wouldn't dare try to look in and - oh fuck, she was already at the door.

It was closed, and Rumi gulped when she heard the creaking a bit better, now overhearing the

sound of muffled moans. They were Izuku's, no doubt about that, and they sounded hotter than anything Rumi had ever heard before. She tried desperately to grasp onto reason, reminding herself that she was in a happy relationship with his father (a relationship that had been distant for years, a dark part of her reminded her).

She was about to finally muster the courage to walk away, go to her room and stay there for a goddamn week, when Izuku suddenly moaned louder. That single moan, that arousing sound, caused the heat to suddenly spike, and Rumi's will broke. Without thinking clearly, Rumi pushed the door slightly open as quietly as she could, moving her head to look in.

As she suspected from the obvious noises, they were fucking, Izuku sitting up on his knees and jackhammering into Saiko, grunting as he thrust in and out. Rumi's eyes immediately trailed down Izuku's body, the strong temple he had built up over the years, sweat gleaming in the orange light from the desk lamp across the room. Rumi felt her knees quiver at the sight of his cock - his large, meaty cock - driving into his girlfriend in and out at a surprisingly rough pace, wet slapping noises echoing in the room.

Rumi felt a small wetness between her legs, but managed to stop herself from reaching in and giving her aching vagina proper attention. This was wrong - fucked up on so many levels, watching the boy she saw as a son fuck his girlfriend and want to be in the position of the girlfriend - but she took a small, deep breath, trying to calm herself. She could do this, she could just go back to her room, turn on her vibrator, and fuck herself all day long. As her eyes trailed down to Saiko, trying to concentrate, she noticed something that made her blink.

Saiko ... wasn't doing anything. She wasn't participating, she wasn't moaning, she wasn't even touching him. She just kind of laid there, staring up at Izuku with a smug smile on her face as he continued fucking her. Rumi felt a sudden jealousy spike within her, a rage fueled by her heat, demanding to know why Saiko was just laying there like a fucking slug, he's fucking you so fucking good, why are you doing nothing?!

Rumi took a deep breath, and silently as she could, she pulled her head back and closed the door. Once it shut, she whipped around and ran straight to her room, not minding that she was using her quirk to get there faster. As she ran, she desperately tried to see reason, reminding her that he's her son (he's not actually your son, her heat seemed to sneer), she was married to his father (Where is he? Why did he take that assignment when he knew you'd be suffering?) and Izuku was dating Saiko (She's just using him!) and it was wrong (but it would feel so right).

She reached her room, and quickly stripped off her clothing. Her heat was truly upon her now, and she had only one thing on her mind. She ripped her dresser open, grabbing the vibrator laying inside, and flopped down on the bed. Moaning out, she turned it on, not bothering to find any lube, and pushed it inside, moaning loudly as it penetrated her. Her heat had fully taken control, and Rumi closed her eyes tightly, thrilling to the imagination of Izuku, her beloved stepson, someone she saw as her own blood, thrusting his big meaty cock into her and fucking her better than his father ever could.

She begged herself, prayed to any god that was listening, that she could control herself until Izuku went back to university. And please, don't make her do something she'll regret - and destroy the only family she had.

Izuku yawned as he opened his door, scratching his bare chest as he moved out to the living room. Saiko had fallen asleep a bit ago, after cleaning up after having sex with him for an hour, and now he was feeling in the mood for a shower. He was sweaty, tired, his bones were sore from doing exercises all day and then fucking his girlfriend. He kind of wished she did a bit more, though -

Izuku hated to sound like he was complaining, but it was kind of exhausting as he did most of the work.

As Izuku headed down the hall towards the shower, taking a second to yawn and stretch the kinks out of his arms, he was suddenly distracted by a muffled sound coming out of Rumi's room.

Izuku turned, slightly confused, and wondering what that was. It was close to midnight, was she still awake? And what was she doing? It sounded like she groaned, was she in pain? Concerned, Izuku approached the door and opened it softly.

"Hey," he said quietly, "is everything oka -"

He didn't finish his sentence, though, as he opened the door a smidge and got a good look at what was inside, his eyes widening. His stepmother, the woman he saw as a second mother, was lying naked on her bed, a vibrator being pushed in and out of her as hard as she could. The lights weren't on, but the moon shone through her windows, showing her beautiful naked form on her bed, muscles straining as she continued fucking herself. Her eyes were tightly closed, her ears curving as she moaned loudly, panting raggedly.

Izuku froze in the doorframe, watching his stepmother masturbate, and before he could decide to walk away, her pants increased in speed, and she let out a loud moan as she came onto the sheets. Izuku stared in a mixture of shock and arousal as her juices sprayed onto the sheets, her breasts heaving up and down as she came hard.

As quietly as he could, Izuku slowly brought his head back out, and tiptoed his way into the bathroom, turning on the shower and stepping in, not bothering to wait for it to warm up. He stared at nothing, feeling his cock still hard from what he had seen, and let out a long groan as he leaned against the glass wall, rubbing a hand through his wet hair.

Oh, god ... what was he thinking? Chapter End Notes

... yeah.

Okay, a bit of background - I had been awake one night, writing up some smut and at a bit of a loss for what I wanted, when I had been checking my Twitter. I came across this /aestheticc_meme/status/1327258154669920256?s=21 and my stupid horny mind went into overdrive, thinking up something I could legit write for them. I checked some other stories, and saw the ones about Miruko's heat - and then, for some reason, I thought about stepmoms. The accursed horniness went like ( ͡ ͜ʖ ͡) and I went like :O and the idea would not leave my mind until I wrote it out, and here we are.

I'll upload part two soon! Just ... don't judge me too harshly.

A Passionate Mistake

Chapter Notes

See the end of the chapter for notes

Izuku let out a small groan as he sank down into his pillows, feeling his nose clogged and a dry cough escape his throat. Of course going on patrol in the middle of a rainstorm would make him sick, he spent so much time running around last night it didn't really register with him. But his foolish mistake caught up with him now, causing him to collapse in his bed in exhaustion this morning while at his stepmother's, unable to make it to school.

Speaking of his stepmother, Rumi entered his bedroom with a wry smirk, holding a tray of soup in her hands as she observed the mess in front of her. She was wearing a pair of short-shorts, a red t- shirt on her torso that seemed a bit too small for her, letting him catch a glimpse of her midsection, her abs poking out and making him catch his breath (although that could also be the mucus in his nose).

"See what happens when you work in a fucking thunderstorm?" She shook her head, setting the soup down on the table and taking a seat at the edge of the bed, "You get fucked the fuck up."

"Yeah, yeah," Izuku nodded slowly, not really wanting to listen to his stepmother's 'I-told-you-so', and reached over to take the soup from the tableside and put it in his mouth. Raising the spoon weakly to his lips, Izuku took a sip, but sighed as he didn't taste anything, the cold removing all the taste from his mouth. He put the spoon back down into his soup, staring dejected at the meal in his lap.

"Hm? Can't you eat it?"

"No," Izuku confirmed, shaking his head. "Can't taste it." He saw Rumi shift out of the corner of his eye, still studying the food as though trying to figure out how to make himself taste it, until he heard her clear her throat.

"If that's the case, Izuku ..." he turned his gaze back to his mother, and felt his jaw drop and his eyes widen. She had ripped her t-shirt off of her body, throwing it away across the room, and fixed him with a lustful gaze, no bra on her body letting her come across as fully bare in front of him, minus the pair of shorts that looked sexy enough. Her breasts were heavy, firm, beautiful - he had to resist the temptation to reach out and take them in his hands, the muscles lining her stomach sending a shot of arousal straight down to his loin. Instead, she grabbed the tray and threw it away, colliding with the wall with a huge crash, soup spilled everywhere. Grabbing her own breasts in her hands, gently massaging, she crawled onto his bed and straddled him, pushing her chest into his face. Still cupping her left tit, she smirked and pressed her nipple against his mouth.

"How about Mommy gives you something better to try?"

Izuku woke up with a start, feeling sweat clinging to his body as he woke up from the very pleasant image he had dreamed up. He stared at the ceiling of his second room, panting slightly from what he saw in his dreams, and felt his erection strain against the pair of underwear he was wearing. He let out a small groan as he threw an arm over his eyes, trying to shake that very pleasant image of Rumi pushing her breast into his mouth out of his mind.

"Oh, you're awake." Izuku jolted, looking up to see Saiko standing at his bedroom door, already dressed. She looked bored, turning around to grab her bag. "I'm going to be heading back to school,

there's not much here to do anyway. I'll see you in a day or so."

"Er - yeah. See you -" Before he could even get up to give her a goodbye kiss, Saiko was out the door, closing it. He could hear her footsteps going down the hall and towards the front door of the apartment, and he frowned while laying back in bed, staring at the ceiling. He really shouldn't be surprised - Saiko was pretty self-centered, not really caring to return any of the affectionate gestures he usually gave her. Normally he didn't really mind, knowing that she needed to go at her own pace - but right now, it didn't really sit right with him.

He knew one of the reasons why, of course - and it wasn't that she didn't seem capable of returning any of the affection he threw her way. No, it was because of what he saw last night. Rumi, his second mother, someone he felt as close to as his best friends, who trained and guided him, who gave him love and affection, had been masturbating on her bed. He had seen her squirt on her sheets. And he was unable to get that image out of his head. He had taken a cold shower last night, but still, the image of her naked form, her breasts heaving up and down as she pleasured herself, would not leave his mind.

He hadn't thought to touch his erection, of course - he had enough self-control for that. But he

knew that it was going to be a problem today - he had to spend some time with her, which was what he had promised, and now he probably wouldn't be able to look her in the eye. He kept remembering how her chest moved up and down, the sound of her beautiful moans, her thighs, which looked like they would crush his head ... by god, those thighs ...

Izuku let out a small groan, throwing the covers off and standing up, stretching slightly. He could do this, he could talk to Rumi without thinking of her naked. It wasn't like this was the first girl he'd seen naked - he'd lost his virginity to Camie, and she was quite buxom, as was Momo and Mei - but this was different. This was his stepmother, and she was - okay, Camie and Momo and Mei were attractive, but Rumi was a woman - a very attractive, sexy woman.

Izuku paused when he pulled up his phone, almost about to check his messages, but he suddenly had an impulse he couldn't control. He went into Google and typed in Miruko in the image bar, and pulled up the first images he could. Some of them were for photos she did as shoots, but then there were the ones that were taken by pedestrians during her fights, some blurry, some posed after she had wrapped up the villain. But then one stood out to him, and Izuku clicked on it, feeling shame start to wallow up inside him.

She just finished fighting a villain, and her strong back was to the camera. Izuku's eyes shamefully went down, and got a good look at her ass. Izuku gulped, and felt himself start to shake. It was ... oh, god, it was big. He knew that his stepmother was quite the sex symbol, on par with Midnight, which Mineta frequently brought up and made Izuku want to punt him to the moon. But now ... now, looking at her in that light, he felt his crotch start to stir in his pants. Her ass was ... oh, god, she was a very muscular woman, but her ass looked so soft, under those hard lines of muscle. Her bunny tail, which he knew to be real since she tended to wear clothes that let it push out, looked so soft ...

Oh, god, Izuku was hard, but he tried to shake his head. Stop looking at your stepmother like that! Not to mention, not only was he considering cheating on his girlfriend, no matter how disappointing the relationship was, he was considering committing - oh god, did this count as incest? Kind of, right? At least, sort of? Either way, if word got out about that, their careers would be over, and the world would be deprived of Miruko. The amazing heroine, top 3 hero, with a heart of gold and a great smile and a huge ass. God damn it, it was huge. No! Stop! Bad Izuku!

Before Izuku could do anything else, a la smashing his head into the wall, a message popped up on

his phone, and Izuku clicked to check who sent it. He let out a small groan when he realized who texted him.

YOU

Yeah, it's cool Are you okay?

(STEP)MOM

yo Izuku I'm not feeling too hot so i'm gonna stay in my room for a bit today that cool?

(STEP)MOM

yeah i'm good just not feeling too good

Izuku's eyebrow furrowed at that, hearing that she wasn't doing okay. Disregarding his previous thoughts, Izuku was quick to put on a pair of pants, and grabbed the disregarded sheets from last night, intending to throw them in the washing machine to get rid of the smell of him and his girlfriend fucking. As he walked down, he shook his horny thoughts out of his head; the least he could do was check in on her, make sure there wasn't anything he could get her. He entered the kitchen and had the forethought to grab her something to drink from the fridge, in case she was thirsty. He went down the living room and to the hall where hers and his dad's rooms were.

After throwing his sheets into the washing machine, he looked a bit to the side, wondering if there was something else he was forgetting, when his eyes fell to some laundry at the side, inside a basket. He was about to turn around to leave, to go give his stepmom something to drink, when his eyes caught something at the top of the pile. He felt an uncomfortable lurch in his stomach when he saw a pair of blue lacy panties, laying at the top of the pile, freshly washed.

For a few seconds, Izuku stared at the panties, his mind immediately going to a place he didn't like. He had an impulse - oh god, he had the impulse to pick them up and smell them. No! Do not pick them up, Izuku! Not only is that fucked up on so many levels, it's perverted as fuck, something disgusting and - oh fuck, he already picked them up.

Izuku stared at the panties in his hand, feeling how soft they were, and had to consciously fight down the urge to bring it to his nose to smell it. Before he could throw them away or stuff them in his pocket, he heard a groan through the walls. Izuku froze up briefly, already knowing what that moan meant, but he couldn't stop himself as he walked out of the laundry room, the panties still in his hand, and walked to the door to his parents' room. Now, he could hear her muffled moans, and the sound of shifting in the room. Taking a deep breath, Izuku closed his eyes briefly, realizing that he could not resist peaking, and, as quietly and slowly as he could, opened the door briefly and looked in.

As he suspected, Rumi was still masturbating, the vibrator being moved in and out at a shocking pace. At least this time, she had changed her positions, rolling onto her stomach and propping her ass into the air, her face pressing into her pillow as she fucked herself. Izuku's eyes immediately went to that huge ass, feeling his cock start to push hard against his pants as he watched his stepmother start to bring herself back to ecstasy.

Without consciously thinking, Izuku's hand went down to his pants, unbuttoning and pulling the zipper down, and bringing his cock out to rub in his hand. He felt ashamed, every fiber of his being screaming at him for doing something so perverted, so wrong, especially when he already had a girlfriend, and the fact that he was staring at his mother figure made it even more shameful. But he couldn't help himself, staring to jack off to the sight in front of him, and stared at that hearty chocolate ass as her vibrator pushed in and out of her.

Izuku let out a small and quiet groan of pleasure from the show, plus his hand rubbing against his hardening cock, and brought his other hand, the one with the panties in them, to his face, and pushed the fabric against his nose and sniffed. Oh, that was the good shit, Izuku shut his eyes tightly as the nice smell invaded his nostrils as he worked himself up. However, before he could continue, he saw Rumi shift a bit, and immediately moved himself away, making sure he wasn't caught. Realizing it was too close, as quickly and quietly as he could, he ran back down the hall towards his own room.

Once he was shut in, Izuku quickly threw himself to his bed, landing on his back, and pushed Rumi's panties further into his face, smelling up her sweet scent as much as he could, groaning as he imagined his stepmother wrapped around his cock, bouncing up and down with that feral grin. Izuku felt ashamed about thinking about his stepmother like that, but he couldn't help it, even as he wrapped her panties around his cock, pumping his hand up and down and rubbing the fabric against it. It wasn't long before Izuku came, both to the arousing thought of the taboo and the soft panties rubbing his prick.

Panting, and realizing his waist was covered in his spunk, Izuku rolled off the bed to grab a tissue from the bedside table. He felt the shame build inside him, thinking of fucking his father's wife, cheating on his girlfriend with his stepmother, the utter taboo nature of it. He felt ashamed that he had caught his stepmother masturbating twice -

- wait.

Izuku stopped where he stood, wiping up his cum with a kleenex, thinking. She - she specifically told Izuku that she wasn't feeling well, and that she was going to stay in her room for the day. When she had gotten sick before, she'd usually tell him to leave the room when he came in to check on her, but wouldn't specifically go out of her way to tell him not to come in via text. And - when she said she wasn't feeling well, he caught her masturbating.

Izuku leaned against his desk, thinking. She said she wasn't feel well, went out of her way to text him not to bother her, and was jacking off? Why did she ... Izuku blinked, suddenly realizing what he was thinking of, and sat down at his desk, grabbing his phone and punching in, wincing when the first thing to come up was Rumi's ass. He flipped to a new tab, and quickly typed in "Animal quirk heat".

"Ah, Ms. Usagiyama! How are you?"

"Fuckin' peachy doc," Rumi said through gritted teeth, her thighs pressed together as she tried to resist her heat to get through this conversation. It had been a long day of nothing but masturbation, but even Rumi knew it wasn't doing the trick. It only somewhat held back the pain, but the

pheromones in her body were demanding a dick in her, and it was getting harder and harder to stay in her room and fuck herself with the vibrator.

"I'm fucked, doc," Rumi growled, sitting down on the bed and trying to control herself for five minutes. "Hiashi didn't come home this year, so now I'm facing my heat by myself."

"Wh - oh, no!" Rumi's doc sounded shocked, realizing the implications. "Is - no, I don't suppose there would be anyone else in the home, would there?"

"That's the fucking problem, doc!" Rumi tried hard to control her breathing, throwing her vibrator across the room so it didn't tempt her. "Izuku came home this weekend, and now the pheromones are targeting him!"

"Oh, god."

"Yeah, oh god is right!" Rumi growled. "I've held off as long as I could, but it's just getting worse! Is there anything I can do?!"

"Oh, dear ... well, firstly, are you in pain?"

Rumi winced, feeling a shot of pain in her loins the longer she went without something inside her. "No fucking shit, doc, this hurts like a bitch."

"Alright, alright - and where is Izuku?"

"I ... I dunno," Rumi shook her head, trying hard to control her breathing. "I texted him this morning, told him I was feeling sick and not to bother me. I - I haven't seen him."

"Okay, good," Her doctor said in relief, "at the very least you haven't broken yet. Now, Rumi, I was afraid something like this would happen one day - but firstly, I would advise you to get Izuku as far away from you as possible. Ask him to leave the apartment. I'm afraid the longer he's in there, the more tantalizing the opportunity would be and the more likely the pheromones will force you on him."

"Oh, sweet Jesus," Rumi groaned, closing her eyes tightly and trying to ignore the pain.

"Secondly, I would call Hisashi and tell him what's happening. Tell him how much pain you're in, tell him to get home as soon as possible, whichever you need. I'd call your office and tell them you need the week off as well, just to be safe."

"Fuck," Rumi growled, "I had shit to do this week. And Hisashi's in America, he can't drop everything and come home."

"In any case, Ms. Usagiyama," her doctor said sternly, "I would get Izuku as far away from you as possible. The longer he's in the general facinity with you, the more likely it will be your pheromones take control."

"I - fine, doc, I gotcha. I'll get him out."

"Very good. And be sure to give me a call tomorrow so I can check up on you. I'd make a house visit, but ... we don't want to risk it."

"Sounds good, doc," Rumi nodded, and turned her phone off, throwing it away. Five minutes to talk to her doctor and now the pain was almost unbearable. Rumi whipped around and jumped on the bed, reaching for her vibrator to shove back into her aching vagina, the pheromones sending

sharp bolts of pain through her. While this pain was pretty much unbearable, she knew that the only remedy was ... her own stepson. And that was a line she wouldn't cross - no matter how much she wanted to.

She was ashamed to admit, but during her times of arousal, she would bring up her laptop and, since her pheromones were targeting Izuku, they would make her look up photos of her son while he was working as a hero. While he was pretty much a low level sidekick, he had gained the attention of the public, especially his fit stature and his skintight uniform. She had encouraged him to show off a bit, seeing it as a well-deserved confidence booster for the boy to have his little fanclub of girls - which she was now reaping the benefit of, looking at photos of his muscles pushing against the green spandex while she fucked herself through an insatiable desire.

However, before she could insert the vibrator within herself again, to somewhat soothe the pain, there was a timid knock on the door.

"H-hey, Mom?" Izuku's voice was heard behind the closed door, sounding a bit nervous. "Can I come in for a second?"

"Wh -" Rumi's eyes bulged, the pheromones within her already forcing her attention to the boy behind the door, but she tried to maintain some semblance of control. "I - I asked not to bother me, Izuku."

"N-no, I get it," Izuku answered, still sounding a bit scared. "I just - there's something I need to talk to you about."

"I ..." Rumi gulped, but the pheromones had already put the idea of Izuku coming in to her room in her head, and she knew she wouldn't be able to resist it much longer. She still looked down and blanched at her naked form, covered in sweat from the long day of masturbating she had, and quickly stood up, ignoring the sharp bolts of pain and stumbling over to her dresser. "Just - just one second, Izuku. Just wait a second."

"Okay."

As quickly and quietly as she could, she grabbed a pair of panties and slipped them on, hoping to cover any juices that may slide down her legs. She then put on a pair of black leggings and a t-shirt with a low line exposing a bit of cleavage. Cursing herself for not having any less revealing t- shirts, she remembered to chuck the vibrator in her dresser, ignoring the pain as best she could, and sat down on her bed, hoping it didn't look too obvious what she had been doing.

"I - okay, Izuku. Come in." "Okay."

Quietly, Izuku opened the door and stepped inside, his gaze immediately going to her. At once, Rumi's heat spiked, and she had to bite down on the inside of her cheek, trying to keep some semblance of control. He was dressed in a white t-shirt that was a bit too small for him, showing off his muscular arms, and the neck was low as well, showing off that strong neck and collarbones. It took all of Rumi's little will not to break and speed over, pin him against the wall, and lick him up, but she repressed it with a shudder. She knew that she had to follow her doctor's advise and get Izuku as far away from her as possible - no matter what the heat she was going through made her.

"H-hey, Mom," Izuku gave her a small smile, a noticeable blush on his cheeks. "I - I know that you said I wasn't to bother you today, and I do understand that, but ... but there was something I had to talk to you about."

"I - I get that, Izuku," Rumi nodded, not really paying attention as she decided to get him out as fast as possible. "I just - I need you to -"

"You're going through heat right now, aren't you?"

Rumi's words died on in her mouth when Izuku interrupted her, making her stare at him with a shocked look on her face. Izuku let out a small squeak, his face exploding into a blush, as he threw his arms to cover his face. It was one of his mannerisms that she hadn't seen in a long time - it was almost funny to see, if not for the shock of Rumi finding out that he knew her deepest, darkest secret.

"You ..." Rumi blinked, "... you know?"

"W-well," Izuku gulped, looking away, "I - I kinda figured it out? I guess? I know my classmates Asui and Tsunotori go through their own heat cycles - they had to be excused from their classes every spring. I just - I just figured it out. Is - is that why you've been in here all day?"

Rumi looked up into his beautiful green eyes, something that he didn't take from his father, and let out a small sigh of defeat. She slumped somewhat on the bed, wincing at the sharp pains poking at her, and nodded.

"Yeah, kid," she admitted. "I'm going through heat right now. That's - that's why I didn't want you to see me. I'm - I'm really going through it now."

"O-okay," Izuku nodded, trying hard not to glance down at the ample cleavage presented to him. God, figuring this out was the scariest thing he'd ever done, it made him stay in his room all day long, afraid of going out into his apartment and being tempted to knock on her door. However, by the time the sun set, Izuku had felt hungry, going to grab something to eat, and heard her moans through the apartment, trying desperately hard to ignore them - but eventually, his curiosity won out, and he knocked on the door. But now ...

"I just - I'm wondering if you're okay?" Izuku said a bit weakly, noticing Rumi's painful face. "I - I only saw Tsuyu in her heat once, and she looked like she was going to jump Uraraka in the middle of class. You - you look like it hurts."

"Er - cause it does," Rumi confessed, glancing away from her stepson - the longer she looked at him, the more appetizing he looked. "My, uh - ow - my dad's quirk mixed with my mom's, so that's why I'm like this."

"Uh - your father's quirk?"

"Yeah. I got the rabbit part from my mom, and from my dad - I got pheromones. They're ..." Rumi bit her tongue there, trying desperately hard to stay in control, but of course, her impulses won out, "... they're ... kind of a lust quirk. It mixed with my mom's, and instead of a heat that lasts a week, this one only lasts as long as my - fuck, ow - as long as the pheromones in my body are there. Once the pheromones are spread and gone, my heat goes away."

"Pheromones ..." Izuku blinked, feeling a bit of concern fill him. "You're - you're saying it literally hurts you if the pheromones are in your body? How do you get them out?"

"Through ..." Rumi sighed, trying not to shift too hard while keeping her gaze locked on a wedding photo on the nightstand, "... through kissing." Izuku's jaw dropped at that, the realization of what that enthralled immediately coming to him. "If I ... if I kiss someone, I spread the pheromones to them, and then the both of us would be - we'd be overcome with lust. We wouldn't stop until the

heat is satisfied - and god, that usually - ow - takes all night." "And ... and dad usually helps you."

"Yeah. He knows, by the way, I told him - but - fuck, ow! - but he couldn't make it this year. He was supposed to be here last night, helping me out, but - but he couldn't make it. Some stupid thing came up, and he's in America." Rumi took another deep breath, trying hard to suppress the pain to get through this, and not fall under her lust and take Izuku then and there. "Listen, kid, I'm - this is awkward, but I do need you to leave. Go back to university."

"Wh-what? When you're in pain?! I can't do that."

"Kid! You have to!" Rumi turned to look at him, desperation in her eyes, and couldn't help the words spilling from her mouth. "My - ow, the pheromones go to the next person I find attractive if I have no control over them, and they've ... ow!"

"Mom!" Izuku moved when a look of pain overcame Rumi, making her wince, and his protective instincts made him run to her, kneeling in front of her and grabbing her shoulders. The motion made Rumi wince, the feeling of his strong arms on hers nearly overcoming her, and she barely held on. "Mom, what about the pheromones? Who have they -?"

"You."

Izuku's words caught on his throat when he heard that whisper, faltering to a stop. Rumi had looked up at him, and Izuku felt a chill go down his spine. Her normally rough eyes, full of fire and courage, only had a mixture of fear and ... oh, god. Lust. She was looking at him with such lust in her eyes. It was so ... it was such a different look it caught Izuku off guard, and he felt the cock in his pants start to stiffen at the sight.

"My pheromones have targeted you." Rumi whispered, gritting her teeth tightly. The time to play around was over, he needed to know the stakes. "Izuku, I'm trying as hard as I can, but I've only got a few seconds of control before I drag you onto this bed and fuck your brains out. I'm - I'm married to your father. You're my stepson. You have a girlfriend. This would fuck all of that up. So I am begging you to get out of this apartment, go literally anywhere else. Because I'm about to break."

He couldn't deny, the words she just spoke, about how much she was holding back now, sent a shiver of something down his back. But he stared up at her, panting and wincing in pain, and realized that he couldn't do as she asked. When she was in pain, he couldn't walk away. The answer to her problems, however, was his problem. There was only one way to make sure the pheromones didn't hurt his stepmother, and it would ruin a lot of things. A lot of things important to him. But ...

... but he remembered how beautiful she was, how she had supported him all along, how much she did for him to make him so much more confident, how he loved her a second mother. And ... and he knew he couldn't leave her like this. That meant ... that he'd have to do something that wasn't very mother/son like.

Izuku took a deep breath, and then doubled his grip on her shoulders. Before Rumi could protest, obviously trying desperately to hold back, Izuku leaned forward and pressed his forehead against hers. Rumi's eyes widened, and she felt the pheromones within her, affecting her heat, spread throughout her body, feeling her heart hammering in her chest as they were practically face to face.

"I ... I have a confession," Izuku mumbled, going much redder, and Rumi smelled his breath, strangely minty, and she desperately wanted more of it. "I ... I was taking a shower last night when I heard you in here. And I peeked." Rumi's eyes widened more, feeling her breath start to come out

jitterly. "I ... I ended up having a little dream about you, but it got interrupted by Saiko. Then, when I was doing laundry, I found your panties, and - and then I heard you again. I watched you again."

Izuku took another deep breath, staring her in the eye. "I masturbated to you. I sniffed your panties. I looked up a picture of your ass and jacked off to it. I ... I know this is wrong. I'm in a relationship, and you're my stepmom. This could - it could ruin everything. But ... but I want to make sure you aren't in pain anymore. And - and I realize that this'll change everything between us, but ... but I can't walk away knowing you'll be suffering until your heat is done. If that means I have to ruin things with you ..." he sighed, then nodded. "then so be it."

For a few moments, they stared at each other, foreheads pressed together, green eyes meeting red. Then, as slowly as they could, they could feel their faces start to get closer.

"Izuku." Rumi's voice was hushed, as both of them began subconsciously leaning in, feeling their noses brush each other as their lips got closer. "This could ruin everything."

"You're in pain," Izuku whispered back, feeling his eyes start to close as their lips inched closer and closer, "I don't want you to hurt anymore."

"Do ... do you want to fuck me? Even ... even without the pheromones or the heat. Do you want to fuck me?"

"I ..." Izuku gulped. "I do. Do you ... if you didn't have the heat, if this was normal ... would you want to fuck me?"

"... God, yes."

With that, both of them felt their hesitation break and leaned in at the same time, their lips meeting together in a passionate kiss. Izuku immediately groaned into the kiss, the feeling of her soft and firm lips something unlike he had ever felt before, the excitement in his chest momentarily hitting him hard. His hands reached up and cupped her cheeks, feeling her long white hair tickle his arms. Rumi, on the other hand, moaned as their mouths opened and her tongue brushed against his lips, the pheromones finally moving out of her body, lessening their pain, and spread to Izuku.

The boy felt the effects immediately, letting out a gasp. They felt like liquid fire spreading through him, filling him with pleasure as their tongues moved in each others' mouths, Rumi raising her hands to rub his shoulders. The longer the kiss went on, the more the pheromones began affecting Izuku, filling him with even more desire than he thought he could feel. All of them directed at Rumi. They finally disengaged from the kiss, breathing heavily, and Izuku took a few seconds to stare at her as she opened her eyes, gazing at him in lust.

Her beautiful skin, her gorgeous face, her soft cheeks, her beautiful hair, her plump lips. Her beautiful breasts. That ass he masturbated to today. All of them making up Rumi, his beautiful stepmother. And judging from the look in her eyes, the pheromones had fully affected Rumi as well, making her go through the same sensation he was feeling. And both of them were taken over by one singular desire:

Each other.

Both of their wills broke at that moment. Izuku's small hesitation, and Rumi's fragile control over her heat, both of them evaporated at that one moment. Izuku grabbed his stepmother and planted another hard kiss to her, opening their mouths to shove his tongue inside and explore, and Rumi grabbed a tight fistful of his t-shirt, pulling him to her to lay atop her on the bed that she and his father slept in. This was so fucked up, on so many levels, but Izuku and Rumi couldn't care at this

moment, not with their tongues battling for dominance as Izuku laid on top of his mother, rubbing her breasts through the t-shirt and Rumi's hands crawled all over Izuku.

Rumi grunted, and used her strength to flip them over, Izuku's head hitting the pillows while she straddled him. Her tail bounced as Rumi began grinding against Izuku's short-covered crotch, both of them moaning as the friction sent small bursts of pleasure to them. Izuku's hands went down to her ass, grabbing two handfuls and squeezing tightly, listening to Rumi moan above him as she continued humping into him. Izuku felt the pheromones direct his state of thinking, obsessed with pleasuring her, and sat them up so he could kiss her again, suddenly finding the inspiration to fuck his stepmother as roughly as he could.

Izuku stood up from the bed, holding Rumi tightly to him, and, using a burst of Full Cowling, sped over to the opposite wall, slamming Rumi up against it. The bunny hero let out a gasp of surprise and pleasure at the pain - Hisashi usually couldn't even hold her up properly, so this sudden strength shocked her - but sent a shiver of pleasure down her all the same. Rumi wiggled out of Izuku's grasp as he bent to kiss her neck, biting it slightly, and she grabbed two handfuls of his shirt, throwing him around and slamming him against the wall this time.

Cracks appeared on the wall where Izuku hit it hard, but thanks to their natural strength-enhancing quirks, this didn't phase them in the slightest. Izuku let out a moan as Rumi started kissing his neck, leaving small bites and hickeys, and his hands returned to her ass, playing with her bunny tail. Rumi moaned at the feeling of her tail being toyed with, and pressed him harder against the wall, more cracks appearing on the wall by the minute. Izuku then grabbed her by the armpits and threw her across the room, Rumi landing and bouncing on the bed with a small gasp, and Izuku was on her in an instant, grabbing her t-shirt and ripping a hole on her chest, exposing her humongous rack.

It was clear that the pheromone had completely overcome Izuku, driving him practically mad with the need to breed, and Rumi wouldn't have it any other way, helping him rip her shirt completely off and throwing the tattered remains away to the other side of the room. It was thankful that Rumi had the foresight to take her pills today, or this would be a problem. Izuku didn't waste any time feeling up her muscles and breasts, panting raggedly, and Rumi let out a small squeal of pleasure as Izuku dove in, shoving his head between her breasts and motor boating them with zeal, kissing and licking. Rumi slammed a hand against the mattress and rolled them over so that she was back on top, laying completely on top of Izuku and thrilling to the feeling of his lips and tongue teasing her.

It seemed that her stepson wanted to dominate some, however, as he rolled them back over so she was on her back, emerging from her breasts to kiss her hard again. Rumi wouldn't let that go without a fight though, rolling them back around so that she straddled him, grinding against him again. Izuku rolled them back over, reaching down and squeezing on her breasts, and Rumi finally managed to get them to the head of the bed to slam Izuku down into the pillows, dipping in and practically shoving her tongue down his throat, Izuku reaching back and feeling up her back muscles with a groan of approval.

This was much harder than it was with Hisashi, Rumi thought as her tongue scoured his mouth, her hands crawling down to grab at his t-shirt. With her husband being much weaker than her, his fights for dominance during her heat could be subdued much easier. Izuku, on the other hand, had his own strength-enhancing quirk to contend with, and was more than willing to give her a fight. Which excited Rumi to the core, making her shudder as she ripped his own t-shirt in half, checking out the delicious scars decorating him. Without any hesitation, Rumi dipped down, kissing, biting and licking his abs and muscles while moaning wildly. Izuku groaned, and raised his hands to play with her ears, scratching them while she worked on him.

Thoughts of the awful thing they were doing with each other were far from their minds. What they were doing to Hisashi and Saiko were inconsequential and could be dealt with later. What Inko would think of this didn't even register to them. The pheromones emitted by Rumi had completely taken over both of them, and the thoughts of being stepmother and stepson were out the window. Izuku and Rumi were man and woman now, two horny beasts ready to tear into each other until the sun rose.

Rumi had reached Izuku's pants, taking a second to palm the erection pushing against them, and used her strength to rip up the waistband. It was a bit harder than the shirt, but Rumi managed to fling the ruined pants off of her stepson, licking at the bulge in his underwear. Rumi grabbed the band and tore it down, exposing Izuku's large cock for all to see. Izuku groaned as his heated cock hit the cold air, and Rumi licked her lips, not seeing a more appetizing thing in her life before her.

Rumi grabbed his cock in her hand and immediately dipped down, inhaling the penis into her mouth. Izuku moaned, the tight wetness of her mouth enveloping him. Saiko couldn't really be bothered to give him a blow job, and combined with the pheromones going through his body, this was already the best blowjob he'd ever had. A large part of it, much to Izuku's shame (though that was clouded by his own horniness) was that it was being given to him by his own stepmother, but the sight of her shoving his cock as far down her throat as she could aroused him to no end, despite the taboo nature of it.

Her moan was muffled as she managed to get his entire cock into her mouth and throat, gagging slightly but refusing to let up as Izuku panted raggedly, grabbing her ears in both of his hands and squeezing lightly. Rumi then slowly brought her head back up, unsheathing his cock, before going back down, deepthroating him again and causing Izuku to cry out and grip her hair even tighter.

Rumi giggled with glee as she continued deep throating him, bobbing up and down and using her tongue to slide up his cock, teasing him even more. She could already feel it start to spasm in her mouth, a clear sign that he was about to cum, and she thrilled to the thought of her stepson cumming down her throat, and began increasing her movements, gagging slightly as the tip continued hitting the back of her throat. Izuku was sitting up, her ears held while his eyes screwed up and panting hoarsely as Rumi brought him closer to orgasm, grabbing his hips tightly in her hands and practically face-humping her stepson, slobbering all over his cock to give it a bit more lubricant as he groaned.

Finally, Izuku's cock twitching in her mouth reached its natural conclusion, and he groaned loudly as he finally came, Rumi moaning as she felt the tip erupt in her mouth. Greedily, Rumi swallowed her stepson's seed as though it were nectar, her own heat making her suddenly thirsty enough to continue sucking him off even after he had finally finished cumming, continuing to ram her head up and down his cock.

This wouldn't do, however, as Izuku grabbed the sides of her face and fully pulled her off his cock, Rumi gasping for breath as soon as it was out of her mouth. She didn't have much time to breathe, however, as Izuku pulled her up to him, slamming his lips against hers and making Rumi moan into his mouth, her tongue shooting straight into his mouth. Izuku scooped her up quickly, grabbing her thigh and ass in his hands, holding her close to him as the two made out.

Suddenly, Izuku's quirk activated, and before Rumi could blink, they were across the room, slamming against the opposite wall and hearing an ominous crackling, lines appearing behind Rumi's strong back. Once again, neither cared, as Izuku whirled her around so he could press her back to his, Rumi letting out a small moan feeling his strong muscles press against her, his cock pushing between her clothed butt cheeks as he grinded against her. Rumi responded in kind, pushing her ass against his pelvis and the two lost themselves while swaying back and forth, Izuku

burying one hand between her breasts and feeling up her abs with the other while sucking on her neck, Rumi moving her hand through his soft hair and rubbing his butt from behind.

Izuku's hands suddenly zipped down, and grabbed the front of her yoga pants with both hands. With sudden strength, Izuku ripped a hole into the front, exposing her pair of lacy black panties, groaning in approval at the sight of them. Pushing the fabric aside, Izuku inserted a finger into her, enjoying the sound of Rumi wildly gasping, her hand in his hair tightening at the sensation. Izuku subjected her to a slow fingering, pushing his fingers in and out while she gasped and moaned and pressed her ass harder against him.

"Don't - fuck, don't tease," she growled, and Izuku let out a small, devious laugh - which turned Rumi on even more than she already was. She whipped around, her long white hair flinging behind her, and kissed Izuku hard, pushing him against the already broken wall while grabbing her waistband. Urgently, she pushed them and her panties down her strong legs, kicking them aside, and Izuku felt some drool escape his lips when he saw her wet arousal, juices sliding down her strong thighs, delicious looking.

"Fuck, you're so hot," Izuku groaned, and pushed his tongue back into Rumi's mouth, who responded in kind, wrapping her arms around his neck as they began stumbling towards the bed. Izuku let impatience overcome him and scooped her up by the thighs, holding her close to him as they kissed and groped each other, Izuku's prick rubbing against her entrance and making her hiss.

"Oh, fuck me, that's so good," his stepmother moaned, using her tongue to lick at the sides of his face like an animal. Which was very much approved by Izuku, who squeezed her ass in appreciation and finally got to the bed, holding her up as he pushed her against the soft bed. Finally disconnecting from their make outs, Izuku glanced back down, seeing her quivering lips, and, hunger overcoming him, immediately crawled down so he could face her vagina. Once he was down there, he went straight to it, immediately pressing his mouth to her folds and pushing his tongue into them.

"Oh, FUCK, yes," Rumi yelled out, squeezing her eyes shut at the sensation - this was much better than her fucking vibrator stuck inside her all day, the feeling of her stepson's tongue pushing into her lower lips and exploring while he pushed her legs out for more room, being sure to rub the soft inner thighs appreciatively. Despite his soft handling of her legs, his tongue was strong and dominant, slurping up whatever juices escaped her as he squeezed his eyes shut, pleasing his stepmother as they lost themselves to the pseudo-incest they were committing.

"Oh, fuck yeah, right - right fucking there, Izuku!" Rumi cried out, throwing her head back and crossing her legs around Izuku's head, pushing him further in. Izuku didn't care for there not being any room to breathe, instead focusing on bringing his mother to the same nirvana she brought him earlier. He pushed himself even further into her, his tongue scouring around, while Rumi thrashed on the bed, throwing her head back and moaning. Izuku's hands went to her large breasts, grabbing one in each hand and squeezing. Her hands went down to his hair, gripping two fistfuls and nodding rapidly as he brought her closer to her climax, her hips already starting to hump his face.

"Mm, mm, mm," Izuku's groaning was muffled, his cock already hard enough to rival steel as he rubbed his nose against her clit, making Rumi scream out. He always enjoyed giving oral to his partners, enjoying bringing them to such climaxes while he heard them, knowing it was him doing that to them - but all of them paled in comparison to the noises he was hearing from his stepmother. Whether it be the pheromones running through him, the taboo nature of what he was doing with Rumi, the noises she was making and knowing he was the one doing that to her, or a combination of all three, he knew that once she was done climaxing here, he needed his cock in her and soon.

"Like that, like that, yeahyeahyeahyeahyeahyeah," Rumi whispered frantically, her eyes rolling into the back of her head as her stepson continued lapping up her juices, his eyes opening to look into her deep red ones. The pheromones running through her were reacting very well to Izuku's ministrations, making her feel like she was on cloud nine. They were always slightly disappointed with Hisashi's performance, pretty much doing what they wanted and just that, but Izuku going above and beyond going down on her meant that her orgasm was at hand, making her scream out as she squirted into his mouth.

Rumi threw her head against the bed, her back arced as she came onto the covers, gasping and moaning raggedly as Izuku tongue-fucked her through her orgasm, gulping down her juices eagerly. Saiko's climaxes were always more subdued, waiting to get over them so she could go clean up, so Rumi's violent explosion was more than welcomed as Izuku finally emerged from her entrance, panting raggedly. Rumi had a hand covering her face, gasping desperately for air as she fought to get back under control.

"Oh, my god, you're so much better than your father," she whispered, the pheromones preventing her from thinking clearly about why mentioning him was not a bad idea. At the mention of his father, Izuku suddenly froze, an unknowing feeling possessing him. He quickly realized it was jealousy, something that he ordinarily wouldn't feel but ramped up due to the pheromones trailing in his mind. Izuku forced himself to sit back up, collapse on Rumi and kiss her hard, making her moan out as his tip brushed against her wet entrance, teasing both of them.

"I'm better than him?" Izuku managed to growl out as they slowly disconnected, hugging her tightly as he began grinding his cock against her, causing her to moan and grip his shoulders tightly. "I'm better than my dad when it comes to fucking you?"

"So much better, baby," his stepmother moaned out, wrapping her legs around his waist and letting him rock back and forth on her, "and I'm so much better than that slug of a girlfriend you have, right? Am I right?!"

"So much fucking better!" Izuku nodded frantically, sitting up on his knees and bringing her with him so they could continue grinding, both of them moaning out at the sensations of his cock teasing her. With sudden violence, Rumi shoved him back hard, his back meeting the edge of the bed as she straddled him, her ferocious grin returning as she grabbed his cock in one hand angled it with her entrance. By now, the pheromones spread throughout Izuku's body made everything feel sensitive, her soft grip on his hard on making him throw his head back and groan in approval as she rubbed the tip of his cock against her wet folds.

"Do you want Mommy to fuck you?" Rumi teased him, having a hard enough time trying to keep herself under control before she said fuck it and dropped down. "Do you want Mommy to sit down on you? Is that what you want, Izuku?"

"Fuck, yes, Mom!"

"Then let's get started," Rumi's patience had broken, and without warning, she dropped down on his cock. Both of them let out yells of pleasure as Rumi bottomed out almost immediately, the sensation of each other immediately filling their thoughts. Rumi's eyes rolled into the back of her head as he penetrated her, his cock filling her completely, and Izuku winced as her tight wetness enveloped him, squeezing the life out of him.

With lust driving both their minds crazy, the two of them got started immediately, Rumi beginning to bounce up and down on him, crying out as his dick was driven deeper into her as she put her hands down on his pecs, rubbing them with her thumbs as she fucked herself on him. Izuku wasn't one to sit there and take it lying down, however, adjusting himself so that he could meet her thrusts

with his own, reaching up to grab her ass as they met in the middle of their thrusting, the sound of his hips meeting her ass echoing in the room.

"Oh, fuck, baby, fuck yeah!" Rumi cried out, biting her lip and grinning as he completely filled her up, feeling her inner walls cling to his cock as they continued fucking. "Right fucking there, baby, that's so fucking good!"

Izuku moaned out loud, watching her breasts heave up and down from the force of her thrusts, hypnotizing. The feeling of her wrapped around his cock immediately drove him half-way into insanity, and sat up, driving his cock even deeper and making her cry out. He kissed her again, lightly biting down on her lower lip and nibbling on it, and Rumi's hands wrapped around his neck, loving the squishing noises that were coming from both of them. Izuku's hands raised to grab both of her ears, rubbing the fur briefly before grabbing them tightly and yanking them back, causing Rumi to scream out in pleasure as Izuku's lips found her neck again, leaving noticeable hickeys on her delicious chocolate skin.

"Fuck me just like that, Izuku, just like that!" Rumi begged him, and Izuku rolled them both over, leaving him on top of his stepmother and beginning to grind his hips into hers, driving himself even deeper. She used her strength to pull him down completely on top of her, her breasts pressed against his chest, and wrapped her legs around his waist, snaking her arms around his midsection. Izuku's hands zipped down to her ass, rubbing the soft skin as he began hammering away at her cunt, listening to her screams and cries of pleasure.

"Oh, my fucking god," Izuku grunted, hugging her tightly to him and pressing his face into the pillow beside her head, feeling his orgasm returning to him, panting raggedly. Rumi, meanwhile, was feeling her own climax approaching, clawing at Izuku's back and leaving thin white lines while she thrashed underneath him, drool escaping her lips. Izuku's thrusts became subtly more powerful, unintentionally activating his quirk and beginning to thrust even harder into her, the bed starting to creak ominously.

"I'm - oh, my god, I'm cumming again!" She screamed out, feeling her climax finally hit her again as she squirted on the sheets beneath them, throwing her head back at the pleasure. Izuku, on the other hand, only moaned as his stepmother's pussy wrapped tightly around his meat, continuing to ram into her while feeling his climax swiftly approach. Rumi continued shrieking as she climaxed again, and continued to cum thanks to Izuku's thrusts, her eyes rolling into the back of her head and her legs squeezing his waist tightly, causing him to grunt somewhat in pain but not stop. Finally, Izuku felt his dick spasm within her, shooting his load into her while he yelled out, one of his eyes screwed up as he gave her the cream-pie she wanted.

As soon as Izuku was finished cumming, however, the pheromones drove them both straight back to work - far from satisficed, they needed to continue indulging in each other. Rumi rolled Izuku off of her, sitting up and throwing her hair behind her head, and dipped down to suck his cock back into her mouth, moaning and slobbering all over it while tasting her essence. Izuku let out a loud groan of pleasure from the sensation of her mouth on him, and without thinking, grabbed her meaty thigh and threw it over his head, making her straddle his head and diving up into her inviting folds, licking hard.

Both of them moaned as they engaged in their sixty-nine, Izuku's arms wrapping around her waist as he continued licking like he was up against a jawbreaker, and Rumi withdrew her mouth from his cock. Izuku groaned in disappointment, but it was short-lived as she arranged herself to place his cock in her cleavage, pressing her breasts to both sides. Izuku let out a wild moan as she began moving her boobs up and down, giving him a boobjob. She licked and sucked at the tip as she heaved up and down, unable to control her moans as Izuku pushed his tongue further inside her.

"Oh, fuck yeah, baby, just like that," Rumi moaned out, moving her hips in time with Izuku's tongue while she heaved her breasts up and down. "Fuck Mommy, just like that, oh, fuck yeah!"

Izuku's moans were still muffled by her snatch over his face, grabbing her large ass and moving his tongue in time with hers. However, both of them were growing unsatisfied with the oral sex, suddenly needing Izuku to be in her again, so he used his strength to push her off of him, making her land face first on the bed, and he managed to quickly sit up on his knees, rubbing his cock as he grabbed her hips and lifted, making her sit up on all fours as he angled his cock to penetrate her again.

"Oh my fucking god, fuck yeah!" Rumi screamed out as he penetrated her again, his hips pressed against her ass as he pulled in and out, grunting with pleasure. "Fuck me, Izuku, just like that!"

He yelled out as she wrapped around his cock once again, and Izuku once again began fucking his stepmother with all of his strength, never minding the bed making a creaking sound again. Rumi laid face down on the bed, her ass still in the air as she bit on the blankets, eyes rolling back in pleasure. Izuku didn't mind at all, but his body had other ideas. Without thinking, Izuku wrapped his arms around her strong stomach, lifting her up and standing. Rumi grunted a bit in confusion, but didn't need to ask as Izuku took her to the other side of the room and pressed her face against the wall, thrusting in and out in a standing position as he glanced down at her beautiful bubble butt jiggling to his thrusts.

"You like my ass, Izuku?" Rumi whispered seductively, pressing her back to his and threading a hand through his hair. "You like looking at your mother's ass? You like it?"

"Fuck, yes," Izuku moaned, biting down on her shoulder while she cried out. "Well, it's all yours! Tonight, you can fuck it all you want!"

He let out another moan as she suddenly pulled out, leaving him groaning in disappointment. But she wasn't one to stop anything, the pheromones demanding she get back to it. She whipped around and grabbed Izuku's face, pulling it down so she could make out with him, Izuku responding immediately and kissing back, their tongues dancing in their mouths. Rumi suddenly used her strength to grab Izuku and throw him straight at the door, the strength of the throw and Izuku's weight breaking it off the hinges. Izuku grunted as he fell onto the door now laying in the hallway, propped up by the wall slightly and scrapping the wallpaper, but Rumi was on him in an instant, shoving her tongue back into his mouth and pulling him up.

Izuku wasn't one to let her roughly treat him like this, however, and immediately scooped her off her feet, hands digging into her ass as he used his speed to blitz to the bathroom, slamming her back into the door and bursting it open. He carried her straight into the shower, slamming her against the porcelain wall and leaving cracks. He used his other hand to turn on the shower, adjusting it to hot while he angled his dick to penetrate her again, causing her to cry out.

As the four showerheads activated, sprinkling them with water, Izuku whirled around and pressed her hard against the glass wall, making cracks tunnel out from where she landed. Seeing as nothing changed in their quirks, neither of them once again cared, now that Izuku was back inside her, and he began thrusting into her at once, thrilling to her screams of pleasure as she scratching his back again, leaving slight cuts from her nails as they were showered in warm water, adding to the pleasure they were going through.

"How much better am I than Dad?" Izuku grunted, the pheromones latching onto his jealousy and demand to know how he compares. "Do I fuck you better?"

"Sooo much better," Rumi groaned out, hugging him tightly to her as she felt her climax once again rising up within her. "God, why the fuck haven't we fucked before?! I'm so much better than that Saiko bitch, aren't I?!"

"So much better!" Izuku nodded rapidly, feeling his dick start to twitch again within her. "We should've done this years ago!"

Rumi let out a scream of pleasure as she came again, feeling Izuku cum within her again, groaning out as they hugged tightly. Once they had calmed down, the pheromones took control again, and Rumi shoved Izuku to the ground, pressing both her thighs together and giving him a thigh job, thrilling to his sperm shooting all over her legs. Words no longer escaped them, the consequences of this far from their minds as they gave into pleasure, ensuring that Rumi's heat would be completed tonight. After Rumi was fucked against the shower floor, they turned it off to fill up the bathtub full of water, fucking on the sink while they waited for the tub to fill. Once it had, Izuku laid inside it, letting Rumi ride him to climax, eyes rolling into the back of their heads as the warmth of the water and their bodies brought them back down.

After leaving the bathroom destroyed, they stumbled into the laundry room, grabbing bedsheets from the washing machine and throwing them into the dryer. Once it had started up, Izuku thrust into Rumi on top of it, thrilling to the shaking of the machine. Once they were done in there, Izuku dragged her out to the kitchen, laying her atop the table while he thrust into her standing up, the table eventually breaking and sending them tumbling to the ground. This didn't stop them in the slightest, however, going to the couch and continuing their sixty-nine, Rumi slobbering all over his cock while he sucked on her clit. They eventually made it back to Rumi and Hisashi's bedroom, finishing destroying the bed in their hard lovemaking. Izuku took her through several positions - missionary, cowgirl, reverse-cowgirl, doggy, piledriving, carrying, wall sex, breast fucking. And Rumi loved it all, being showered in his love and affection while they had the longest and best night either of them ever had.

Hours had passed, the night almost finished along with Rumi's heat, and they had reached Izuku's own room, and Rumi demanded that he fuck her atop it, desperate to show him a better time than his slug of a girlfriend. Izuku did exactly as instructed, throwing her onto his covers and taking her in a missionary position. The sun peaked out in the horizon as Izuku and Rumi heaved against each other, sweat coursing down both of their bodies and wet hair sticking to their forehead. Izuku threw himself down on her and kissed her hard again, the pheromones starting to weaken at long last.

"I -" Izuku groaned out, the first thing they really said in hours as his hips thrust harder into his stepmother. "I - I love you, Mom."

"I love you too, Izuku!" Rumi moaned, squeezing her thighs tightly together as she felt yet another climax upon her. "I love you, I love you, I love you so much!"

"I love you!"

"FUCK, I LOVE YOU!"

Both of them screamed out as Izuku erupted inside her once again, and both of them finally felt their strength give out, Izuku collapsing ontop of his stepmother as they desperately gasped for air. Rumi felt the heat finally leave her mind, and she shuddered as she finally felt her orgasm subside.

They gasped for a few minutes for air, Izuku leaning up on shaking arms to look down at his stepmother, and planted a few more kisses to her lips, which she eagerly kissed back. As they languidly made out, finally feeling tiredness and exhaustion overcome them, the pheromones slowly faded away at long last, leaving them finally satisfied. Izuku weakly pulled out of his

stepmother, feeling his dick finally flaccid, and both of them broke from their kiss to gaze into each other's eyes.

And that's when the pheromones were truly gone, and reality settled in.

Izuku's eyes widened, staring down at the mess his stepmother was. Hickeys littered her entire body, she was bruised on her waist and neck, her hair was a wet mess, and his seed slowly flowed out of her, and the implications finally settled in for him as to what he just did. They just - oh, god, they just had sex. All night long. He had sex with his stepmother. He had came in her several times. He cheated on his girlfriend. And now horror started to fill him.

"I-Izuku?" Rumi asked, feeling fear start to fill her. As her heat and pheromones finally calmed down, not to be dealt with for another year now, what had just happened was settling in for her. She had an affair. She committed adultery. Not just with anyone, but with her stepson. If anyone heard of this, their careers would be ruined. His cum was leaking from her - thank god she had the forethought to take her pills, but that didn't stop her from staring up at her son's horrified face, seeing her bite marks all over him, her rough hands leaving bruises.

"I ..." Izuku gulped, staring down at her. "I ... I shouldn't have ..." Without thinking, Izuku leapt off the bed, stumbling slightly on his weak knees, and gathered up some clothes from his dresser. Dressing at lightning speed, Izuku quickly went to the door, looking back to see his stepmother sitting up on the bed, her hand outstretched.

"I'm ..." Izuku felt tears prickle his eyes, and he took another deep breath. "I'm sorry."

And without looking back, he ran out of the room, out of the apartment, and away from his stepmother.

It had taken Rumi a few minutes to get up from the bed on shaking legs, feeling awful for what had just happened. She slowly left the room, glancing back at the rumpled bed with the obvious stains from their sweat and juices clinging to it, and she sighed. She walked down the hall to look at the living room, seeing the furniture destroyed and laying in pieces, the same with the kitchen, with the table laying in two and the counters littered with fluid, some of the hanging pots and pans laying on the ground below. She glanced into the laundry room, seeing the destroyed machines, and the bathroom which had broken glass and a chunk of the bathtub taken out of it when Izuku had kicked out. Finally, she reached the bedroom, stepping over the door and seeing the bedframe laying uselessly against the wall, one of the bed's legs broken.

She slowly sat down on the edge of the bed, the musk of sex and sweat still in the air, and she slowly reached for her phone, bringing it up and immediately pushing in Hisashi's number. She brought the phone to her ear and waited to connect, sitting there on the slightly damp bed, before she heard the other end of the phone crackle.

"Rumi! Hey." Hisashi sounded oddly out of breath, as though he were running. "It's pretty early in the morning, what's up?"

"Hisashi."

"Yeah? What's up?"

"... I cheated on you."

For a minute, there was silence on both ends of the phone. Rumi sitting there, guilt coursing through her while Hisashi was silent. Finally, she heard him sigh.

"... okay. I guess ... I was gonna wait until I got home, but I guess I've gotta do this now."

It had been two weeks until Izuku and Rumi saw each other again, with the bunny-woman sitting out in the parking lot of the university Izuku attended, waiting for him to exit the building he used. During that time, Izuku had come clean with Saiko and admitted he cheated on her, feeling ashamed for what he did, only for her to brush him off, saying that she didn't mind since she had been sleeping with Yo Shindou behind his back for a few weeks now. Their breakup was pretty inevitable, and Izuku was thankfully able to not admit who exactly he cheated on her with - no need for that to get spread around.

For the next two weeks, Izuku was in a saddened mood, knowing that he had destroyed his relationship with his awesome stepmother due to their lust. He was wondering how it would go going forward - would she not acknowledge the affair? Would they have to hide it from his mom and dad? - but as he exited the lecture hall, walking outside with his friends, Ochako looked in the distance and her eyes widened.

"Hey Deku - isn't that Rumi?"

Izuku jumped somewhat and whirled around, his eyes wide. Sure enough, there was Rumi leaning against her car, thumping her foot like she usually did when she was impatient. As soon as she caught sight of him, she straightened up, biting her lip.

"Er - yeah," Izuku nodded, feeling nervousness start to crawl all over him. "I should - I should go talk to her."

"Deku, is everything okay?" Ochako asked, a bit concerned.

"I - yeah, Uraraka. I just - we just need to talk about something. You don't need to wait up."

She didn't look particularly convinced, but she still let Izuku walk away, turning around to walk back to the cafeteria with Iida. Izuku made his way down the hill to the parking lot, eventually coming to Rumi, who glanced up at him. For a few seconds, they stared at each other, with the boy not really sure how to begin. Before he could, however, Rumi spoke first.

"Hey, kid," she nodded slowly at him. "How - how are you doing?"

"I - fine."

"Good." She gestured with her head. "Do you mind taking a drive with me? We gotta talk." "Er - yeah. Yeah, I can."

Rumi nodded, and turned around to enter her car. Izuku let out a small sigh as he went around to the other side, getting in. Once he was, Rumi drove off, not really looking for anywhere in particular to drive, just needing to have some privacy. As they rode off, Rumi turned off the radio, sighing, and pouted a bit.

"I ... okay," she breathed out, "first off, this is about us - you know. Fucking." "I ... I figured."

"Yeah," Rumi sighed, leaning back. "Well, first off, I should start with saying that I did tell your father I cheated on him." Izuku sat forward, eyes wide, but she raised a hand. "I didn't say with who - I don't need that kind of stuff ruining your family."

"Oh." Izuku nodded slowly, sitting back in the seat. "Okay."

"We're getting a divorce," she continued to explain, grimacing. "It turns out - well, the reason he couldn't make it back was because he met some chick in America, and agreed to stay the week - he forgot that it was my heat until I called him. So he spent the night with her."

"Oh. Oh, my god."

"I know," Rumi sighed, biting the inside of her cheek. "So that's over. I guess ... I guess I'm not your stepmom anymore."

"I ..." Izuku felt the blow to his chest, feeling oddly empty inside while he sat forward, thinking about it. They weren't - they weren't technically family anymore. The thought of it saddened him immensely, the thought of Rumi leaving his life permanently, especially on such a messed up note. Without thinking, Izuku reached his hand out and took his stepmother's hand in his, giving it a comforting squeeze and making her look around in surprise.

"I ... I don't really care," Izuku told her, feeling himself go slightly red but still confessing his feelings. "You're still my mom. I - I know what we did was really messed up, but you were in pain. If I had to do it again I would. And I - I really hope that you'll still be in my life."

Rumi stared at him for a few seconds, taken aback, but then she gave him her familiar fierce grin and ruffled his hair.

"Of course, kid," she laughed, "I'm not going anywhere."

Izuku couldn't help but smile at her as she turned her gaze back to the road, driving around. As Izuku settled back in his seat, he couldn't help but lower his eyes down to her body, seeing the cashmere sweatshirt she was wearing with the brown pants. He felt a bit nervous looking at her like this, but he felt a sudden boost of confidence, that didn't allow him to hold back on what he wanted to say.

"Er - hey, Mom?" She turned her attention back to him, seeing him blush. "I ... I know what we did was really messed up, and it was wrong, and we should never do it again - but - but I don't like the thought of you going through that alone next year. If - If you don't have a b-boyfriend by then ..."

Rumi's eyes widened, realizing exactly what Izuku was implying. That if she didn't have a boyfriend by the time her next heat came back, he'd be willing to step up to plate. She was about to tell him no, to not make this more complicated than he had too - when she remembered the night they had. The intense lovemaking, the kissing, the groping, everything. It had, by no competition, been the best night she'd ever had, despite the taboo nature of it. And if he was offering ...

Without thinking, Rumi lowered a hand to Izuku's crotch, rubbing it. The boy stopped his stuttering and mumbling when he felt her touch on him, gasping as she grabbed the hardness that had started when he started remembering the night they had. Rumi smirked, and was sure to drag her hand along it.

"If neither of us are dating by then," Rumi didn't look at him, keeping her eyes on the road, "then I'd be more than willing to let you help me out."

That was under the assumption that she wasn't going to have a boyfriend, she remembered, but she shook that thought out of her head. A long, complicated marriage she just got out of? There's no reason for her to jump back into the dating game ... for a few years at most.

Chapter End Notes

Sorry this came out so late, guys, I kinda got distracted by life XD. Thank you for joining me in the degeneracy!

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