Would've Chosen You Anyway
Summary: When Izuku presented as an alpha as a kid, he was caught off guard and immediately bit Katsuki, claiming him as a mate. It wasn't until years later when Katsuki presented as an omega that he finally understood the urge to claim Izuku back.
This is my first ABO, so please be kind. :D I tried to make my story a bit different from others I've read. I may have projected some of my kinks onto Katsuki oops.
Midoriya Inko peered into the living room, smiling softly as her son Izuku and his best friend Katsuki chased each other around the coffee table.
"Silver Age All Might, we must team up to save the citizens of the city!" Katsuki announced, making his All Might action figure fly around in the air as he talked.
"You're right, Bronze Age All Might!" Izuku said back in his best All Might voice, waving his own action figure around. "The villains are too strong for us to take down alone! We must team up and work together for the sake of both of our timelines!"
Inko giggled, finally stepping into the room. "They can work together tomorrow, you guys," she said. "It's time for bed."
Izuku pouted a little. "Awh, mom. Just a little longer!"
"Yeah! Come on, a little longer!" Katsuki chimed in, looking distressed. He was normally much more of a rowdy and demanding kid, but even he knew not to disrespect Ms. Midoriya.
Inko put her hands on her hips stubbornly. "That's what you said a half hour ago, you guys. Now, run upstairs and climb in bed like good little heroes-in-training!"
Izuku glanced over at Katsuki. Katsuki shrugged.
"Alright, mom," Izuku sighed. "Will you tuck us in?"
Inko chuckled. "Sure, honey," she said.
Katsuki grinned. "Bet you can't beat me there!" he yelled, taking off at a run before he even finished speaking. Izuku was right behind him, not wasting a second.
Inko laughed. She was glad that Izuku had such a good friend. The two of them were inseparable. When she finally made it up the stairs after them and into Izuku's bedroom, she saw the both of them squeezed into Izuku's bed, shoving each other over for more room.
"Move over, Kacchan," Izuku whined. "You're hogging the whole bed."
"No, I'm not!" Katsuki yelled back. "I'm pressed up against the wall. You're the one not giving me any room!"
"You two are getting so big. You won't be able to share a bed for very much longer," Inko said. "Are you sure that you don't want me to get a futon out for one of you to lie on the floor?"
Katsuki and Izuku both looked up at Inko in horror. "No!" they both shouted together. Inko chuckled.
"Alright, then," she said. She leaned down to kiss Katsuki on the forehead and then to kiss her son's forehead as well. "Sweet dreams, you two."
"Good night, Ms. Midoriya," Katsuki said.
"Good night, mom," Izuku said as well. She waved as she left, shutting the bedroom door behind her with a quiet click.
"You want to continue playing tomorrow? Or does your mom want you home right away?" Izuku whispered, turning on his side to look at his friend and not feeling tired at all.
"I've got time," Katsuki whispered back, turning on his side to look at Izuku too and grinning mischievously. "We can't let both of the All Mights' timelines stay in danger, after all."
Izuku smiled. "Yeah, exactly!" He wrapped his arms around his best friend in a tight hug, burying his face in Katsuki's shoulder and rubbing his scent on him fondly. Katsuki was a little embarrassed at the overwhelming show of affection, but he hugged him back all the same.
"I'm so glad that you're my friend, Kacch-" Izuku began. He wasn't even able to finish his sentence before suddenly a flash of pain ran through him, and he clenched his teeth in agony.
"Deku?" Katsuki asked uncertainly. He felt Izuku shudder and tense up against him.
"Kacchan," Izuku whispered into the crook of Katsuki's neck, still keeping a tight hold on him. "It… hurts."
Katsuki shoved him away just far enough to inspect him with concern. His eyes widened at what he saw. Izuku's face was scrunched up in distress. His incisors grew at an alarming rate. His eyes gleamed with a predator's stare.
"Alpha," Katsuki whispered.
Izuku had presented… as an alpha.
This was not what either of them had expected. They were both still in elementary school, so Izuku was still rather young. He was a late bloomer when it had come to his quirk (Izuku still hadn't developed one yet and his mom had started to worry that he would never get one), but apparently, he was an early bloomer when it came to his second gender.
Katsuki pouted a little in jealousy. He had always thought that he would be the alpha and Izuku would be a beta doomed to spend his whole life in his shadow. It didn't make sense to him that Izuku would present first.
"Kacchan," Izuku sobbed, nuzzling his friend's neck and inhaling deep. His new inner alpha was restless. He didn't understand what was happening to him. "I'm just… just so glad that I have you. Want you with me always. You smell so good." There was a yearning in him now, something that had always been there to some extent, but it suddenly amplified to beyond what Izuku was able to comprehend.
"Deku, what are talking about?" Katsuki asked, blushing a little and trying to push him off. "Stop being so embarrassing."
Izuku held him tighter, his fangs bared, his eyes clouded with something inhuman.
"Want you," he whispered.
"What do you mean, Deku?" Katsuki asked, a little annoyed that his friend wasn't making any sense. "I'm right here, you idi-"
Fangs suddenly sunk into the skin over Katsuki's scent gland, digging in deep, sharp and permanent. Blood poured out from the wound, filling Izuku's mouth and staining the bed.
"You're mine," Izuku snarled once he pulled lose: an alpha's order. Katsuki hadn't presented yet, so he wasn't affected by the harsh command. He just laid there in shock.
Izuku leaned down and licked the skin of Katsuki's neck, cleaning it of blood.
Katsuki shuddered, his heart pounding in his chest. "What… what did you just do?"
At the sound and scent of Katsuki's fearful confusion, Izuku snapped out of his daze, horrified with himself. "I… I'm sorry, Kacchan. I didn't mean to. My body just suddenly… My alpha… it wanted…"
Katsuki shoved him off the bed and onto the floor.
"Get away from me," he snarled. "I can't believe you claimed me. I didn't say you could do that."
Katsuki couldn't believe that this was happening. Izuku was an alpha. He couldn't even begin to process the thought that he'd been claimed by an alpha. The only thing that would remove the claim now would be the bite of another. He would never be unmated again, and Katsuki hadn't even presented yet. He wanted to be a hero when he grew up. He wanted to be the best. How could he ever be the number one hero if he was owned by someone like Deku?
Frustrated tears formed at the corners of Katsuki's eyes.
"We're not friends anymore! This bite… it doesn't mean anything."
Katsuki didn't present until years later. If Izuku was considered a bit of an early bloomer, then Katsuki was considered a really late bloomer.
It made no sense to Katsuki. He had developed his quirk, and practically perfected it, at a very early age, so he wasn't sure why his second gender was taking so long. By the time that they had both been admitted into UA High School, Katsuki was the only one in class 1-A who had not presented yet. Most people left him alone about it, though. He had an alpha's claim on him, after all, so he smelled vaguely of alpha. Katsuki never bothered to correct them.
As time went by, Katsuki went on ignoring Izuku and refusing to acknowledge their bond or their past friendship. Izuku couldn't think of anyone that he would rather be bonded to, but he still felt guilty about the way that it had happened. He hadn't meant to do it, but as they had both laid there in each other's arms in that bed as kids, it had just felt so right. His whole world had narrowed to his desire for Katsuki in that moment. His new alpha instincts had immediately taken over.
Izuku hated that that's what it had taken for him to realize that he had a crush on his best friend. Even though Katsuki had pushed him away after that, Izuku never really stopped wanting him.
He stared at the back of Katsuki's head during class. His eyes wandered over Katsuki's neck, and he wished he could see the mark that he'd made one more time. Katsuki refused to leave it uncovered. Even during summer, he wore his hero uniform with a high collar to hide the prominent teeth marks over his scent gland. Katsuki never spoke of second genders. He never showed any interest in dating or having pups one day. All he wanted was to be the number one hero, and he swore to anyone who asked that he wasn't going to let any of that extra stuff get in the way.
Izuku selfishly hoped that Katsuki would never find someone else to replace his mark with their own. He wanted Katsuki to be his mate for real, forever. Katsuki had been right: the bite didn't mean anything the way it was now. Katsuki hadn't chosen it. He had never acknowledged it. Izuku had no real claim over him. Even during his ruts when his body craved his mate, Izuku never sought Katsuki out. He didn't feel like he had any right to.
That didn't mean he couldn't dream. As he sat there in class, he found himself wondering for the millionth time if Katsuki would present as an alpha or a beta. Both options were enticing in their own way. He fell headfirst into the familiar fantasy.
However, he didn't have to wonder for much longer.
Suddenly, right there in the middle of class, Izuku smelled it. A pleasant aroma pervaded the air, making Izuku gasp with the intensity of it. His eyes widened as he realized what was happening even before Katsuki did.
Katsuki growled deeply and braced himself against his desk. Pain shot through him, and he clutched his stomach. He panted heavily, suddenly feeling dizzy. It was happening. He was presenting.
However, Katsuki's teeth didn't grow into sharp fangs like he had expected them to. His eyes did not become wild with the blood-lust of a predator. Instead, his body flared up with heat, releasing a sweet scent into the air that only Izuku could smell. Katsuki felt like he had downed an entire bottle of aphrodisiac. He felt drunk.
Izuku let out a shuddered breath, feeling a little faint himself.
Omega. Bakugou Katsuki was a male omega.
Male omegas were so rare in their society that they were virtually unheard of. There wasn't any genetic need for men to be omegas. They could never get pregnant and bear pups, so their heats didn't mean anything. Their bodies craved sex and craved to be impregnated even though it was impossible. They were seen as broken, the dregs of society, not even fit to be mothers or caregivers. Traditionally, they had been viewed only as useless sluts and sex toys for their betters. Izuku didn't understand. That didn't fit his image of Katsuki at all. He had never imagined this as a possibility.
Everyone in class stared at Katsuki. Despite what was happening in front of their very eyes, no one realized that he was an omega yet. They couldn't smell him. Katsuki had already been claimed. His pheromones affected only one person.
"Bakugou, what the hell are you doing?" Aizawa-sensei asked him with a sigh, turning from the chalkboard with an unamused look on his face. "Please don't interrupt my class."
"Uh… sensei," Izuku said, fighting hard not to give in to the urge to bite Katsuki again right there and then in front of everyone, "may I take Kacchan to the infirmary? His stomach has been giving him problems lately. He's not well."
Aizawa looked back at Katsuki, realizing that his sudden outburst had not been a joke. He sniffed the scent of distress in the air and sighed. "Fine," he said. "Go."
Izuku quickly stood up and grabbed Katsuki, pulling one of his arms over his shoulder and hauling him out of the room quickly before anyone could guess what had really happened.
Izuku sped through the halls to the infirmary, trying not to think about the warm body draped over him as he gripped Katsuki against him tightly. He was grateful that the hallways were completely empty. He didn't think that Katsuki would appreciate anyone seeing him like this. He didn't want anyone to see himself like this either. He tried to calm himself down, but his body was quickly flaring up in an answering rut.
"Alpha," Katsuki groaned against Izuku's shoulder.
Izuku gulped and took a deep breath. He tried hard not to think about what Katsuki would sound like begging for him in that voice.
"Just a little further," he said, pushing the door to the infirmary open and shoving Katsuki inside. He closed the door behind them quickly, shutting everyone else out.
"Recovery Girl!" he cried out, his voice breaking. There was no response. He looked around the entire room and saw no one. There was a sign over her desk that said she would be back in five minutes.
They were all alone.
Another enticing wave of omega pheromones wafted through the air and made Izuku weak in the knees. He had to be careful. He was the only real danger to Katsuki now.
Katsuki wobbled over to the nearest infirmary bed and lay down on it slowly. His face was flushed, and he seethed with frustration. Izuku's eyes widened when he noticed Katsuki's erection straining against his uniform pants. He looked just as turned on as Izuku felt.
Izuku stayed near the door, trying his best to control himself.
"This is… bullshit," Katsuki grumbled through clenched teeth. "There's no fucking way I'm an omega. I can't be… It makes no fucking sense."
"It's just biology, Kacchan," Izuku insisted. "You're still the most badass guy I know."
Katsuki let out a low chuckle. "Of course I am, shitty nerd!" he said enthusiastically, his demeanor changing back to reflect his usual arrogance. "I could beat you any day of the week."
The side of Izuku's mouth curled up in a half-smile as he was suddenly hit with an idea. "Not any day," he said, purposefully egging Katsuki on. "I've beaten you plenty of times already. I'm going to become a better hero than you, just you watch."
"In your dreams, asshole!" Katsuki shot back. Izuku was glad his plan seemed to be working. He knew Katsuki better than anyone else, and he knew that comforting him would just have the opposite effect. He needed to distract Katsuki from the pain of his heat, even for just a little bit.
"I knocked you on your ass yesterday in class. I thought you were going to be my rival and actually challenge me to be the number one hero," Izuku taunted. "Presenting as an omega isn't an excuse. You better come at me with all you've got."
"Fuck you!" Katsuki yelled. He flipped over onto his front and clawed the bed sheets for relief, panting hard. "This omega shit has nothing to do with that. I'll kick your ass."
"I'd like to see you try!" Izuku retaliated. "Look at you, barely keeping it together right now. You're pathetic. Fight it!"
Katsuki growled, low and animalistic. Izuku was so sure that his degrading words would make Katsuki fight harder against what was happening to him. Instead, they were only fueling the fire, turning him on even more.
"God damn it," Katsuki sobbed, his voice breaking. "When the fuck is Recovery Girl coming back?"
Izuku wasn't sure exactly when Recovery Girl left her office, but he was pretty sure that she had been gone much more than five minutes by now. He didn't tell Katsuki this, however. He held onto the desperate hope that she would be back soon.
"You giving up already, Kacchan?" Izuku retorted instead, trying even harder to antagonize Katsuki into fighting his instincts now that he felt Katsuki slipping. Without realizing it, he was beginning to enjoy teasing Katsuki a little too much. He had always fantasized about putting a horny and willing 'Kacchan' in his place, shaming him for being a brat until he finally broke down and begged for a knot. "Maybe you are weak after all," he growled, his voice beginning to sound deeper now, more threatening.
The authority in his voice made Katsuki let out a small frustrated whimper. "Don't you dare… look down on me… shitty alpha," he whined.
Izuku's rut was growing unbearable. He could barely hold himself back from holding Katsuki down and breeding him so full of cum that, even as a boy, Katsuki would feel pregnant afterward.
Izuku bit his lip, blushing deep red as Katsuki brazenly started to rub himself against the bed underneath him. Both of their resolves were crumbling fast.
Before he even realized what he was doing, Izuku let out a small snarl. He stood taller and puffed out his chest. "Kacchan, snap out of it!" he ordered. Katsuki didn't listen, he was never one to follow orders so easily, but he let out a gasping, stuttering breath in response. The alpha pheromones in the air were intoxicating.
"Mate," he sighed. "Please."
Izuku backed up further into the corner of the room, shock snapping him out of his own daze. Katsuki had never called him that before. The bond between them had never really felt real. Hearing Katsuki openly desiring him was too much. Izuku wanted to just give in and climb on top of him so badly.
"You're going to hate yourself when you remember this later," Izuku said, shaking his head. This wasn't right. He shouldn't do this.
"Make me shut up then," Katsuki gasped as he continued desperately humping himself against the surface below him. He was delirious with lust at this point, too far gone to realize the situation he was in or the unfiltered honesty in what he was saying. "Make me take your knot, alpha. I want it."
"No, Kacchan," Izuku mumbled, squeezing his eyes shut to resist the lewd scene in front of him. "I can't. You don't really want this. You would kill me if you were conscious of what you were asking right now."
Katsuki shook his head even though he was clearly out of his mind with desire, inexperienced and ignorant of how to deal with his first heat. "No. Wanted you… for so long, Deku. Take me. Fucking take me, dammit."
Izuku needed to get out of there. Now.
In a burst of sheer willpower and green lightning, Izuku sprung toward the door. "Recovery Girl will be here to help you soon," he said quickly. "I… I'm sorry. I can't be near you right now." He forced himself through the door and into the hallway.
Izuku would've given anything to hear Katsuki say those words and mean it, but he knew that it wasn't real. Katsuki would never beg like that. He wasn't thinking straight.
Izuku wasn't about to make the same mistake that he did last time. He wasn't going to give in to his basic instincts.
Katsuki deserved better than that.
It was surprisingly easy for things to go back to normal after that. Recovery Girl found Katsuki not long after Izuku had left and prescribed him with suppressants to control his heat. They were fast-acting, and Katsuki was back to class and grumpy like normal by the next day.
Izuku avoided looking directly at Katsuki even though he could feel red eyes staring at him everywhere he went. He didn't want to embarrass Katsuki by bringing up all of the debauched things he'd said. It was probably just that stupid bite mark that had messed with Katsuki's head. The pheromones between them made him say things he didn't mean. He probably would've been just as desperate for any other alpha. There was no way that Katsuki had been telling the truth that he'd wanted Izuku for a long time. It had to be a mistake.
At the end of the day, Izuku noticed Katsuki waiting for him by his shoe locker. He looked pissed, just as Izuku had feared.
Izuku didn't really feel like being mocked or rejected. He knew better than anyone that presenting was never pretty. It was hard to control. He thought it was better to save Katsuki the embarrassment and ignore what had happened, just like they always had.
He left the building out of a separate entrance, still wearing his indoor shoes.
It took a while for anyone else to notice that Katsuki's scent had changed. No one but Izuku could smell Katsuki's pheromones because of the bite, and the suppressants muted his overall smell even further. Katsuki had never announced his unpresented status to the world anyway, so people had always assumed that he was an alpha, because all they could smell on him had been Izuku's claim.
Kaminari and Kirishima were laughing with Katsuki in the dorm common area almost a week after he'd presented, when Kaminari finally noticed that Katsuki's smell was off. He leaned in a little closer to sniff in the direction of Katsuki's shoulder.
"Oy, Bakugou," he said, sniffing again with a face scrunched in confusion. "Is that… omega smell?"
Kirishima's eyes widened and he leaned in to sniff as well. "Whoa!" he said, noticing the same thing. "It is!"
Katsuki waved them both off moodily, swatting them away. "Get out of my face!"
"Did you bang some omega chick or something?" Kaminari asked, still baffled.
"It's such a subtle scent though," Kirishima said, frowning thoughtfully. "Actually, your alpha smell has always been really subtle too."
Katsuki stood up and pushed past them. "Leave me alone," he grunted. "It's none of your business."
He left both of them stunned. They had both smelled a mix of alpha and omega scent on him, but it didn't seem right. If he'd had sex, the smell would've been much stronger. Even if he'd just been spending time with an omega, he wouldn't have smelled like that. Neither of them had ever heard Katsuki express an interest in sex or romance at all. It didn't make sense.
Was Katsuki the omega? They both pushed that idea aside immediately, knowing it couldn't be true. All they knew was that something had clearly changed, and Katsuki's situation, whatever it was, was complicated.
Kaminari and Kirishima were loyal friends to Katsuki, so they didn't say a word about what they kept smelling when they were around him, not even to Sero and Ashido. Katsuki generally kept his distance from most people, so no one else noticed for a while.
It wasn't until a week later that Katsuki started exhibiting even weirder behavior.
After class, Todoroki walked up to Izuku and smiled a little. "Hey, Midoriya," he said coolly. "Do you want to watch that TV show you were talking about earlier today? It sounded good." Ever since they had fought each other in the Sports Festival, they had gotten closer and were spending more time together.
The room emptied as all their classmates filed out of the classroom as usual, excitedly talking amongst themselves about what they would be doing over the weekend. No one thought twice about them hanging out with each other.
No one except Katsuki.
Katsuki hid outside the classroom doorway and watched them, grimacing at the annoying smell of happiness wafting from the room. Todoroki looked at Izuku with a look of starry-eyed affection as he listened to him talk animatedly about some nerdy hero show he wanted them to watch together. They both looked so content in each other's presence.
It made Katsuki sick.
Todoroki was a beta. He didn't release pheromones like an omega and wasn't overwhelmingly attracted to them like an alpha either. He was almost always so composed and calm, practically the opposite of Katsuki. Katsuki couldn't comprehend why Izuku liked the guy, and he didn't understand why the idea of them together made him so angry.
Even before Katsuki had presented, it seemed like everything Izuku did had pissed him off. Now, however, puberty seemed to hit him hard and the intensity of smells in the air affected him more than normal. Even just a simple interaction between two people he didn't care about sent him into a frenzy.
He found himself beginning to get pissed off that the claim mark on his neck only went one way.
Before Katsuki could think about what he was doing, he marched back into the classroom, shoved himself between the two of them, and grabbed Izuku's arm to pull him in closer.
"What? K-Kacchan?" Izuku stammered, not sure why Katsuki was even there.
Never breaking eye contact with Todoroki, Katsuki nuzzled his scent gland against Izuku's, slowly and deliberately. He pulled Izuku in closer, rubbing their necks together, scenting him thoroughly until he was satisfied. When he finally pulled away, he glared at Todoroki for one second longer before looking down at Izuku.
Izuku, completely taken off guard, looked Katsuki in the eyes for the first time since that day in the infirmary. His heart beat fast as he was held close and eyes searched his.
He was stunned. What the hell was Katsuki doing? Why could he never tell what Katsuki was thinking?
However, before he could ask, Katsuki was already gone. He stomped out of the room, his face uncharacteristically red, not saying a single word.
Todoroki sniffed the air and the scene before him finally clicked. His nose wrinkled a little at the smell of Izuku now. Everything about him screamed 'keep away.' "Ah, that makes sense," he said simply.
Izuku whirled around and stared at him, open-mouthed. "What made sense about that, exactly?"
"We can watch that show some other time," Todoroki said, patting Izuku's shoulder sympathetically. "You should probably get all this sorted out first."
"Huh?" Izuku asked, shocked that Todoroki had suddenly changed his mind. "Get what sorted out? What are you talking about?"
Todoroki sighed. "Just talk to him. You'll figure it out."
He left Izuku to stand in the classroom, alone, completely clueless about what had just happened.
Izuku didn't take Todoroki's advice. He didn't really understand what had happened, so he just elected to ignore the whole thing.
Katsuki didn't stop trying to get Izuku alone.
"Hey, Deku," he yelled after several failed attempts, whirling around in his seat the second that class was over to catch Izuku before he ran. "When are you finally gonna pull your head out of your ass? Why are you treating me like-?"
"Uh, sorry, Kacchan. I've got plans with Aoyama tonight. Bye!" Izuku couldn't get out of the classroom fast enough, even though Aoyama was still there packing up his things.
Days passed since Katsuki had scented him, and Izuku learned to deal with people teasing him about smelling like an omega. When Kirishima first came near him since the scenting, he stopped in his tracks, hitting Kaminari on the arm and looking at him meaningfully.
Kaminari burst into laughter in response. "Man, we're dumb," he snickered. "Good job, Midoriya!"
Izuku felt like everyone knew something that he didn't. It was getting tiresome.
Eventually, after about a week of not answering people's questions no matter how much they begged, people began to leave him alone again. He stopped looking in Katsuki's direction, and he clung to his friends so that he could never be cornered alone. Katsuki's scent eventually wore off. He sighed in relief. Maybe it was finally over. Maybe things could go back to normal and they could be friends again.
As soon as he thought that, however, it happened again.
One Sunday morning, he and Uraraka were studying together in a secluded corner of the campus. Their table was piled high with strategy textbooks. Izuku had even brought a couple of his Hero Analysis notebooks to show her so that he could give her tips on how to improve.
Uraraka beamed excitedly as he stood next to her chair and pointed to the textbook. "I really think this type of technique would help you gain the element of surprise. That way you could get in closer while your opponent is distracted to use your martial arts skills or touch them to make them float!"
"Oh wow! I never would have thought of that," Uraraka said thoughtfully.
"Maybe we can ask Iida to practice with us later so you can try to surprise him," Izuku suggested.
Uraraka beamed.
"Thank you, Deku!" she said cheerfully, standing up from her seat and throwing her arms around Izuku's neck in a hug. The beta girl rubbed her face and chin against his shoulder, happily marking him as a dear friend of hers with her scent. "This is such a relief. I was so worried about this practical test that-"
Before she could even finish, someone else grabbed him by the back of his collar and shoved him up against the wall. Izuku flinched and looked up, finding two red eyes staring down at him, aggressively searching his gaze.
It was Katsuki again, and he looked even more pissed than usual. He blocked Izuku from escaping by putting his arm against the wall.
"This avoiding me shit ends now," he barked.
Izuku blushed at the closeness of their bodies, remembering what it had been like to hold Katsuki against him while he stunk of heat and pheromones. "Uh… uh… I…"
Katsuki sighed at Izuku's lack of words and leaned down to nestle their necks together once again. This time, he didn't stop there. He angrily rubbed against every part of Izuku that he could reach, covering his face and shoulders with his scent. A normal gesture that some would do softly or sensually, he did hurriedly like he had to scrub Izuku clean of any smell that wasn't his. He pushed closer and closer until they were both pressed fully against the wall. He ran both of his hands up Izuku's arms, touching as much of his skin as he could.
Izuku let out a little involuntary sigh of pleasure.
Then, just like before, when Katsuki was satisfied, he sprung away from Izuku like nothing had ever happened. This time, however, he didn't run away. He continued to glare at Izuku and Uraraka.
Izuku looked helplessly at Uraraka, completely flabbergasted and unable to form a thought. He had no idea what Katsuki was upset about.
Uraraka shot a flustered look right back at him, also unsure of what had just happened. Then, she sniffed the air, and it all became clear. "Oh!" she shouted. "I didn't know. I'm sorry! Uh… congratulations!" She rushed to gather an armful of textbooks.
"Wait, Uraraka! What?" Izuku called after her, but before he knew it, she had already scampered away.
Izuku stood there, stunned. This was crazy. Twice now, Katsuki had barged in without warning and chased off his friends. Katsuki used to tease him a little in middle school, but Izuku thought that was all behind them. Maybe what had happened between them in the infirmary had brought up too many old grudges.
"What the hell is your problem?" Izuku yelled at Katsuki. "Why are you being so weird, chasing everyone away from me?"
"I tried to get you alone, but you were always hanging out with those stupid betas," Katsuki grunted. He grabbed Izuku's hand, making Izuku's eyebrows shoot up in surprise. "Come on."
Katsuki dragged Izuku around the corner and up the stairs toward the boys' dormitories. Some other students stared curiously as they passed by. Izuku looked down at the ground, avoiding their gaze. He wouldn't know how to explain this if he tried. Was Katsuki challenging him to some kind of fight?
They reached Katsuki's dormitory, and he unlocked it. "Get inside," he ordered. "We're settling this once and for all. You better not fucking run again."
"I… I'm not running," Izuku lied.
Katsuki shot him a look that clearly expressed that he didn't believe him for one second. He walked into his room and turned the lights on. "Hurry up!" he shouted. Izuku trailed behind him, shutting the door carefully.
Katsuki sat on his bed, and Izuku sat on the chair to Katsuki's desk, keeping his distance.
Katsuki raised an eyebrow at him. "We used to share a bed when we were kids, for fuck's sake. Sitting next to each other isn't going to suddenly send me into another heat or anything. You need to calm the fuck down, stupid Deku."
Izuku stiffened in his seat, looking away in shame. "T-that's not it. I'm just comfortable over here, that's all."
"Quit acting so weird. It's driving me crazy," Katsuki grumbled. "Is me being an omega that much of an inconvenience to you? All through middle school I couldn't get you to leave me the fuck alone, and now what, you suddenly want nothing to do with me?"
Izuku didn't know what he had expected Katsuki to say, but that hadn't been it. "Inconvenience? No, not at all, Kacchan!"
"Then why are you treating me like I'm some plague you don't want to catch?" Katsuki asked, eyes narrowed. "I'm not good enough for you anymore, huh? You looking down on me, thinking I'm not still a threat? Die!"
Izuku wilted in his seat as the weight of what Katsuki said began to hit him. As far as he knew, no one else knew about Katsuki being an omega yet. Katsuki didn't really have anyone to talk to about this life-changing experience, and Izuku had just abandoned him. He ignored him at every turn.
He looked at Katsuki and finally saw the insecurity in his facial expression and the way he held himself. No one but Izuku would have noticed. He should have noticed. Katsuki was right. He had been a shitty friend.
"I'm sorry, Kacchan. Yeah, I've been avoiding you," Izuku admitted, "but not because of that. I thought it would be better to not make a big deal about it and act normal."
Katsuki sighed exasperatedly. "You idiot. Don't you realize that avoiding me like that is the exact opposite of acting normal? Usually I can't get you to shut the fuck up!"
"Then why are you complaining?" Izuku shot back. "If you're not angry, and you haven't been trying to chase away my friends, then why have you been scenting me?"
Katsuki got a little flustered at the question, his face twisting into anger again.
"You've got your scent all over me, so why can't I do the same?" he asked a little too defensively.
Izuku paused, staring at Katsuki for a long moment before asking quietly "why would you want to smell more like me though?"
Katsuki seemed caught off guard at the idea of actually having to explain himself. "Uh… I dunno," he said quickly, not looking Izuku in the eyes. "The scent of alpha keeps the extras away. I'd kick their ass if they tried anything, of course, but being a guy and an omega, the things people say- I'd just rather not have anyone giving me shit."
Izuku's heart sank. Oh. So that was the only reason? The little bit of hope that he'd kept that it had meant something more burst inside of him. He looked down at the floor sadly. "Still, why me? Haven't you always hated me for what I did?" he asked, voice shaking slightly.
Katsuki blinked in surprise. "I don't hate you." His demeanor suddenly shifted completely. He looked at Izuku very intensely.
Izuku shook his head. "You should. You don't understand, Kacchan. When I smelled your heat, I just… I was right back to being a kid in that bed with you. I wanted to mate you so bad."
"Then why didn't you?" Katsuki asked, his voice dangerously low. He gripped the bed sheets below him tightly. "Normal alphas take what they want. I was literally asking for it."
"You weren't in your right mind, Kacchan," Izuku said with a scoff. "I wasn't going to rape you."
"Fuck you if you think that wanting sex makes me some kinda mindless omega bitch," Katsuki yelled. "I don't give a fuck what people say. This omega bullshit means nothing, I'm still the best. The number one hero is going to be a boy omega, and they can all just cry about it."
"Wait… what?" Izuku suddenly had the sense that they were both talking about two different things. He'd been so caught up in trying not to force himself on Katsuki that he hadn't recognized it, but... Katsuki thought that Izuku had rejected him for being an omega.
"You think I would've ever asked for some knot that I didn't want?" Katsuki continued, growling at the very thought. Izuku's heart beat fast, realizing what Katsuki was admitting. "I told you I wanted it, and you didn't take it. I may have been horny as all hell, but I was still me."
Katsuki's face burned red, but finally, he refused to look away.
"I know better than anyone how pheromones can make you lose control," Izuku protested, despite the hope rising in his chest again.
"So, you claiming me was just you losing control, and I just happened to be there? Is that what you're saying?" Katsuki snarled. For one short second, Izuku could see the hurt in his eyes beneath his usual façade of unshakable confidence.
Izuku suddenly understood that Katsuki had no idea what had really happened the night he was claimed. Katsuki had no idea what he meant to him.
Izuku sucked in a deep breath. All the feelings he'd been stopping himself from having for Katsuki all these years, afraid to hurt him, finally began to bubble over. "I've loved you since before I can remember, Kacchan," he breathed out, letting it all go. "It's only ever been you. But I thought… I thought you would never accept me as your mate."
Katsuki's eyes widened, but he stayed silent for a long time. Izuku wished that he could read his mind.
Finally, Katsuki rubbed the back of his neck and sighed. "At first I was pissed off that you took away my choice," he admitted, almost begrudgingly. "Then, I guess I was just pissed I would've chosen you anyway. Presenting just… made it hard to ignore."
Katsuki would've chosen him. The idea made Izuku bare his fangs. His eyes flashed with the desire of an alpha barely holding himself back from his prey. All Katsuki needed to do was say the word, and Izuku was ready to make him his a thousand times over. "Are you sure I didn't… make you want this?"
"I've never done a single fucking thing that I didn't want to do," Katsuki barked back, also visibly growing excited by the change in Izuku's attitude. "Though who the hell knows why I would ever care about some shitty alpha who won't just take the hint and fuck-"
Green lightning sparked in the air as Izuku launched himself onto Katsuki, sitting on him and pinning him to the bed.
"Quiet, omega," Izuku whispered into Katsuki's ear, loving the shiver of desire that went through the body beneath him.
"Yes," Katsuki agreed. "Fuck yes."
Izuku's lips crashed down onto his harshly.
Most people pictured their first kiss as something tentative and awkward, Izuku had never wanted to kiss anyone other than Katsuki, who was always full of endless passion and fury. Katsuki kissed back with the same intensity that he did everything in life, just as Izuku had always imagined.
Izuku pushed Katsuki down, unrelenting, as years of built-up desire pulsed through him. "Do you have any idea how long I've been fantasizing about this?" Izuku groaned, shifting his butt against Katsuki's crotch ever so slightly.
"You never shut up, do you?" Katsuki grumbled, pulling Izuku into another kiss. He slid his tongue into Izuku's mouth, rubbing them together heatedly.
Izuku couldn't believe how lucky he was that Katsuki was so ready and willing.
Katsuki pulled back and quickly reached for Izuku's t-shirt, eager to get Izuku undressed. Izuku immediately grabbed both of Katsuki's wrists and pinned them against the bed before he could get the shirt off.
"What do you think you're doing?" he asked, his eyes gleaming.
"You're so fucking slow," Katsuki complained. "Hurry up and get in me already."
Izuku had spent way too long imagining losing his virginity with Katsuki like this. There was no way that he was going to just rush through it sloppily like Katsuki wanted. He was going to make Katsuki enjoy every second.
"You're always so impatient," Izuku murmured. "But you'll just have to wait."
He let go of one of Katsuki's wrists to pull the collar of Katsuki's shirt down, exposing his neck for the first time since they were children. He stared at the oval-shaped bite mark, no longer red and bloody from trauma like he remembered. The bite had healed and faded into his skin. It was part of Katsuki now.
Izuku leaned down and licked it, sucking the sensitive skin on his neck gently in silent apology for their past.
Katsuki moaned sharply, arching up to meet him.
Izuku licked a long stripe back upward so that he could slot their mouths together once again. He made no move to undress Katsuki. He didn't even bother to get up from his position on top of him.
Moving his hand back down to keep a firm grip on both of Katsuki's wrists, Izuku leaned back and continued to rub himself against Katsuki's crotch lazily. He kept focused, just as he would've been in a fight, watching the man beneath him grow more and more distressed with every passing second, never underestimating him.
Katsuki shuddered and moaned in irritation. "Shitty Deku, what are you doing?"
"Taking it slow. Teasing you," Izuku said with a playful smile. "I've waited so long for this. Gonna make you feel so good."
"I'll believe it when I see it!" Katsuki shot back, despite this erection hardening in interest under his thin pants. "Just hurry up and touch me, scum!" He was still a far cry from the version of him that had been aggressively humping the infirmary bed and begging for his alpha.
Izuku would change that.
"Stop arguing so much and take off your shirt, Kacchan," Izuku ordered. Katsuki raised a skeptical eyebrow. Where did this nerd get off bossing him around like that? However, he did so without protest, biting his tongue to hold back any insults from slipping out.
Izuku grinned.
Suddenly, green lightning flashed through the air. Izuku grabbed Katsuki, pushing him back onto the bed and pulling his ass up, spreading his legs faster than the eye could see. Katsuki was reminded in an instant just how easily Izuku could have overpowered him. Katsuki could've always fought back and blasted him away, he was never the type to go down without a fight, but this time he didn't want to. He wanted Izuku in control.
Izuku brought his hands up to unbutton Katsuki's pants, looking him in the eyes with a bright smile now that Katsuki was behaving. That pissed Katsuki off. How the hell did this asshole have such a commanding presence one minute and then go back to his usual bright-eyed, nerdy self the next?
"Why are you looking at me like that?" Katsuki grumbled.
"You're amazing," Izuku said with awe, massaging his hands up Katsuki's chest and then dragging them back down again. "So good underneath me like I've always wanted you. Lift up your hips."
"Do you ever stop talking?" Despite his protests, Katsuki continued to do as he was told, since it was getting him what he wanted in the end anyway. Izuku slid off Katsuki's pants and underwear, tossing them aside onto the floor, leaving Katsuki completely naked.
Izuku stared at him in unbridled adoration.
Katsuki scowled. There was something vulnerable about being the only one in the room without clothes on. Nevertheless, he still didn't shrink under the alpha's gaze above him. He was better than that. "My turn," he insisted. "Shirt off. Now."
"You ordering me around, omega? I don't think so," Izuku said forcefully, refusing to back down. He leaned in for another kiss, pushing Katsuki's legs up above his head and gripping them tightly as he did so. He kissed the corner of Katsuki's mouth, all the way over to his ear. "Am I being too pushy?" he asked softly. "Yes or no?" He knew that being an omega was a little bit of a sensitive spot for Katsuki, and he didn't want to make it worse.
Katsuki grunted in annoyance at the question. "More like you aren't being pushy enough," he hissed. "If you're gonna bother with so much foreplay, you might as well do something good like smack my ass and call me a whore or something."
"Oh?" Izuku said, his face darkening with growing lust. "Is that what you want?"
Katsuki looked surprised, like he hadn't actually expected Izuku to take him seriously. "Yeah. Fuck yeah!" he said, getting more excited with each word. "You're an alpha, right? Prove it. Make me submit. If you can."
Izuku would never stop being in complete awe of the man he had claimed. Seeing Katsuki so eager to be dominated was something he thought that he would only see in his dreams. Maybe all along Katsuki's bad attitude had just been the only way Katsuki knew how to make Izuku push back.
Izuku couldn't wait to knock him down a peg and make him sob for it.
He let go of Katsuki's legs. "Flip over, then."
Katsuki bit his lip and did so without protest, ready for Izuku to push him down and have his way with him.
"So you like when I tell you what to do?" Izuku grabbed Katsuki's ass, kneading the flesh with his hands.
Katsuki only nodded in response, exhaling heavily with the relief of being touched.
Without warning, Izuku smacked the skin of his butt. "Answer me!" he ordered.
Katsuki's face twitched like the slap had only been a minor inconvenience. "Is that all you've got?" he chuckled. "I've gotten worse beatings than that in class."
Izuku narrowed his eyes, but kept smiling, taking it as a challenge. "Well if you don't like this, I guess I can just stop."
"No!" Katsuki shouted.
"Then answer my question!" Izuku shouted back. "You like taking orders from a 'shitty alpha,' you pitiful whore?"
Katsuki bit back a moan as his previous words were all thrown back at him. "Yes. Fuck, yes. Put me in my place."
He spanked Katsuki's ass again, hard. This time, as a reward, his body pulsed with green lightning. Katsuki flinched, and his hips trembled. He let out a small, shaky sigh.
"You think I'm scared of your stupid quirk?" he taunted, despite his body's reaction. "I've seen you in action. I can handle way more than that shitty little percentage of your power you can actually use. Your hands will be more black and blue than my ass when you're done with me. You'll walk out of here in worse shape than me, and I won't even need to lift a finger."
Izuku rubbed the globes of Katsuki's butt cheeks absentmindedly. "Is that what you think?" he asked. He swiftly struck Katsuki's ass again, hitting the other cheek this time. His entire hand glowed as he did so, leaving a red mark against Katsuki's skin.
Katsuki grunted in pain, sucking in a breath.
"You're so weak, you can't even handle one omega," Katsuki spat, despite the flush on his cheeks and the catch in his breath. "Some successor of One For All you turned out to be. All Might would be so disappointed in you."
At the mention of All Might, Izuku frowned. He knew that Katsuki was only trying to rile him up, lashing out to get the alpha in him angry enough to lose control and ravish him, but he was acting like a brat. "You're really asking for it, aren't you?" he asked with admiration in his voice. He had wanted to take it a little easy on Katsuki for their first time, but Katsuki wasn't having it, and who was Izuku to deny him?
His hand came down hard, thumping against the sensitive skin of Katsuki's upper thighs. Katsuki hissed with a mix of both pain and pleasure. Izuku hit him again and again, changing the percentage of One For All gradually each time. Each slap was a surprise. He smacked one cheek or both, depending on his mood.
Katsuki grunted with each blow. His noises grew louder and louder, until finally, he was shaking and panting for more.
"Yes, j-just do it already, fuck," he stammered, jolting at the next impact. His cock hung low below him, leaking precum onto the sheets.
"Do what?" Izuku asked, stilling his hand.
"Fuck me," Katsuki moaned, too far gone to care about how desperate he sounded. "Just… fuck… T-there's artificial slick in my bedside table." Katsuki lowered his head a little, half expecting Izuku to judge him, but the alpha pretended not to notice.
Despite being an omega, Katsuki was a boy. He didn't produce any slick naturally, so he needed artificial lube to make him wet. Some people might have looked down on him for being a "broken" omega, but Izuku didn't. Katsuki was perfect the way he was.
"Oh? What do you use something like that for? Do you touch yourself and think of being a good little omega for me like this?" Izuku's heart pounded with excitement at the thought.
He leaned over and grabbed the bottle of slick from the drawer. It was right where Katsuki said it would be, right next to a knotted dildo.
Fuck.
Izuku had always been the more patient of the two, but it was hard to hold back and keep himself from mindlessly ravaging Katsuki's body. "Oh, wow," he said breathlessly, trying to keep his composure. "You really are a knot-hungry slut, aren't you?"
Katsuki's head spun around, suddenly realizing what Izuku had seen. "So what if I am?" he barked, not even bothering to deny it. "That thing's probably better than your pathetic cock, anyway."
Izuku hit both sides of Katsuki's ass again hard, causing him to cry out in surprise. "Do you want me to just leave you here alone with it then?" Izuku asked.
Katsuki shook his head. "Fuck no!" He needed this to happen. There was no way, after all this time, that he was going to let Izuku go without finally making good on his claim.
"Good boy," Izuku said, opening the bottle and spreading the lube over his fingers.
At the sound of the bottle, Katsuki raised his butt in the air further, instinctively giving him more access.
"You're so cute like this, Kacchan," Izuku cooed, earning a glare from the other boy. "You want me to fuck your tight ass that badly? Are you gonna behave and be a good omega?"
Katsuki wasn't stupid. As much as he wanted to argue, he knew that wouldn't get him what he wanted. "Yes," he said, gritting his teeth and leaning over to present himself. He was tired of waiting. He wanted more. He wanted to be a good omega.
Izuku rewarded him by sliding a cold, wet finger inside of his hole. The blonde let out a small sound of approval at the intrusion.
"You're not as tight as I thought you'd be," Izuku said, sliding another finger in with surprising ease. "Did you already open yourself up today? Did you prepare for me by stretching your cute hole?"
Katsuki ignored his embarrassing question in favor of moving his hips back to force Izuku's fingers deeper, his brow furrowing with annoyance.
"So that's a yes, then," Izuku replied, knowing Katsuki well enough to understand. "You've got this dildo, yet you're trying so hard to get me to fuck you. I thought you said my cock was pathetic in comparison. You're a terrible liar."
He pushed his fingers against the walls of Katsuki's insides, splaying them out and rubbing them deeper and deeper. He took extra care to open him up thoroughly. Despite Katsuki's heats and his body's misplaced desire to be knotted and bred, his ass wasn't actually made to take something so large.
"Why don't you just stick it in finally so I can judge?" he yelled anyway, his patience wearing thin. Izuku increased the pace of his fingers generously, the lube making a squelching sound with every movement. "Quit fucking rambling on like you always do. Just shut up and put your money where your mouth is."
Izuku removed his fingers completely without warning, causing Katsuki to growl a bit ferally. He could have teased Katsuki more, but he was also already at his limit. His own cock strained against his boxers, hard and ready.
"Turn around, then," Izuku said, pushing down his shorts and underwear, just enough to pull his dick out. He stroked it slowly, covering it in lube. "I want to look at you while I fuck you."
Katsuki turned himself over, laying on his back once again. He stared at Izuku's cock hungrily, before looking Izuku directly in the eyes. Izuku loved the silent dare in his gaze, the taunt to continue. Everything between them had always been a competition that no one but them understood.
Izuku loved it. He loved him. Katsuki was so beautiful. They were doing this, really doing this, after all these years.
Izuku lined himself up with Katsuki's entrance and pressed in easily.
Katsuki shuddered with relief at the slide of skin against skin, his eyes fluttering closed as Izuku slowly filled him up. Izuku's heavy length sat inside him for a moment, allowing Katsuki time to adjust. Katsuki was tense below him, his breathing labored.
"You okay?" he asked. Katsuki tried to grind upward, but Izuku held him in a death grip until he answered properly.
"Of course I am," Katsuki said through gritted teeth. "Your dick isn't that special."
"This is your first time, Kacchan. You're all tense. I'm not moving until you're okay." He kissed Katsuki's cheek. Katsuki was a little shaken by the intimacy of it. He had wanted it rough partly to avoid this kind of sappy shit.
"You're so annoying, damn nerd," he grumbled. He took a deep breath, not wanting to admit that Izuku's gentle kisses down his neck were actually working to help him calm down.
Feeling Katsuki relax, Izuku thrust forward slowly at first, his member inching farther and farther inside. Katsuki let out a shaky breath. The stretch of Izuku inside of him felt kind of weird but also really good.
Izuku moved his hips shallowly, unhurried as he pulled back out and thrusted back in. They were pressed so closely together that the mixed smell of pheromones and nitroglycerin was intoxicating. "Ugh, you're so tight," he rasped out. "I'm glad you prepared yourself earlier. At least now you seem loose enough that I won't hurt you."
A small buzz of pleasure began to build up inside Katsuki, but it wasn't enough. People praised him every day. He was the best, so naturally he was used to that. He wanted more. He wanted to feel owned, loved. He didn't want to be abandoned anymore.
"Dammit, Deku. I want you to hurt me, you idiot. Break me! Use me! Do whatever you want, just touch me." The words left his mouth before he knew what he was doing with them, but he finally felt like he was being honest for once.
Izuku ran a gentle hand up Katsuki's body, stopping to pull lightly at his exposed nipple. "What if I'm already doing what I want?" he asked, returning Katsuki's stare with just as much intensity. "I could just fuck you slowly like this, ignoring you sobbing for more, and watch as you come undone, little by little."
"Ugh, no. No. No. No. More. Give me more, you useless nerd," Katsuki barked.
"What's the magic word?" Izuku asked, unimpressed by Katsuki's weak attempt to order him around.
Katsuki let out a long groan of frustration. "Oh, come on."
"All you've gotta do is be good, Kacchan. Be good for your alpha." Izuku couldn't help but enjoy watching Katsuki squirm uncharacteristically.
"Please," Katsuki muttered, hating to say it but desperate for Izuku to just pound into him already.
Izuku shook his head. He pulled out of Katsuki slowly, then pushed back in inch by inch. "You're the best omega. I know you are, Kacchan. You can beg better than that." He rolled his hips encouragingly, treasuring every sound that he forced out of the man beneath him.
Katsuki gasped for air, his body shaking as he finally let go. His mind went blank with lust. "Please. Please, alpha."
"Please what?" Izuku asked softly, pulling out again, torturously slow.
"I'm made to take cock," Katsuki said, the words coming out so easily that it can't have been the first time that he had imagined saying it. "So just… treat me like it."
Katsuki could barely finish talking before Izuku slammed in to the hilt in one swift movement, causing Katsuki's whole body to jolt in surprise.
"Ah!" he screamed with his eyes squeezed shut. He braced himself against the bed for the rough fucking he was about to receive.
Their bodies trembled together as Izuku fucked into Katsuki hard, claiming him in the way he'd always wanted. Katsuki's legs wrapped around Izuku, taking him in further. He clenched around Izuku's cock, milking it for all it was worth.
Izuku took a second to pull himself up onto his knees, using them for better leverage. He thrusted down into the man below him, grabbing Katsuki's thighs for support and gripping them tightly.
"Yeah," Katsuki breathed out happily as Izuku pushed and pulled his whole body, impaling him on his cock. This is what he craved. This is what he needed.
Deku leaned into the movement, propelling his hips forward to crash again and again against Katsuki's muscular ass. He didn't give Katsuki a single second of rest.
"Good little slut," Izuku cooed, trying out the nickname. "You take my cock so well. Is this what you wanted? To be just a hole for me to use?"
Katsuki's eyes were clouded over with bliss. "Just a hole," he agreed, barely coherent.
Izuku pressed a hand down on the base of his neck, not enough to choke him. He kept him like that, pressed down into the mattress possessively, reminding Katsuki of just how much control he had over him.
"You're such a good omega," Izuku said. "The best fucking hero in the world. You can do anything. But here you belong to me. You're mine to do with as I please. Is that what you want?"
Katsuki finally looked up at Izuku, seeing him clearly. "Yes," he whispered. The pressure of being the best all the time was gone. Here, underneath Izuku, he could shut off his brain and just be worshipped for being the type of omega that society hated. He was being given everything he wanted, everything he deserved. His mate wanted him back. He was loved.
Izuku's scarred hands held Katsuki tight enough to bruise, one holding Katsuki's thigh open as he thrust into him at a brutal pace.
"Ugh, pound me harder," Katsuki demanded. As both of their orgasms were beginning to build, Izuku did as he was told. He sped up his assault on Katsuki's tight hole.
"What do you think of my 'pathetic' cock now, Kacchan?" Izuku asked with a teasing smile.
Katsuki didn't answer. He reached for his own cock and began tugging at it desperately.
Izuku growled and pulled Katsuki's hand away, forcing his arm back on the bed. His hips stilled, despite the fact that neither of them wanted to do anything but chase their orgasm at that moment. "Ah, ah, ah," Izuku huffed, committing to the dominant character that he knew Katsuki wanted. "Have you learned nothing? Answer me first. Say it. Say you want my cock."
Katsuki whined lowly. "Fucking hell! Don't stop!"
"That's not how you can get what you want, and you know it," Izuku panted. Contrary to his unsympathetic facade, his knot was beginning to fill out. He was beginning to lose control as the need to breed completely overtook him.
Katsuki groaned. "D-dammit. Who do you think you are, useless Deku?"
"I'm the one currently in control of your whole body so show me respect," Izuku growled back. His inner alpha was angry at being defied. "Answer me, omega."
Katsuki keened at the authority in his voice. "I want… I want your pathetic cock," he said with every bit of defiance that he could muster.
Izuku smirked. "If I'm pathetic, then what does that make you, huh? How does it feel to be fucked by a 'useless nerd'?" His hips snapped back into him hard. He grinded against Katsuki's prostate, making him cry out.
"G-good. It feels so good," he whimpered.
"Whose whore are you?" Izuku asked.
"Yours," Katsuki replied immediately. He took the brutal thrusts like a champ, moving his hips back to meet Izuku's every movement.
"Whose bite is that on your neck?" Izuku demanded.
"Fuck, 'zuku. Your knot. It's getting bigger," Katsuki moaned. His insides were beginning to stretch farther than they ever had before. It was nothing like the toy he had in his bedside table. Izuku's dick was starting to catch on the rim of his hole with each thrust. The pull of it drove Katsuki wild.
"You're almost there, Kacchan," Izuku said soothingly. "Tell me whose bite that is, and I'll let you touch yourself."
"Yourssss, fuck. Fuck, I'm all yours. Always have been. Please," Katsuki sputtered.
Izuku slammed in one final time before his whole body shuddered with shockwaves of pleasure and his knot finally locked in place, letting out a steady stream of warm cum. He let Katsuki's hand go, and Katsuki wasted no time to stroke himself wildly.
"Kacchan, you're such a good little omega for me. Love you so much," Izuku gripped him tight and mumbled incoherently as he came. His hips continued moving, grinding into Katsuki's prostate even as he couldn't pull out anymore. "You feel so good wrapped around my knot. So hot. So tight. You're so fucking amazing and perfect, Kacchan."
It was too much for Katsuki. He opened his glazed-over eyes to look at Izuku who was practically drooling as his body shook with prolonged orgasm. He felt a dark desire well inside him, the need to keep Izuku his forever.
"You're my alpha," Katsuki insisted, his lips pulling back with a feral growl. "Mine."
Without warning, his head jerked forward, and he bit hard into Izuku's neck.
Katsuki didn't have the long fangs of an alpha, but he could still break skin. He chomped down hard, ignoring Izuku's sharp cry of surprise and pain. Blood flowed out of the wound, and he sucked it all up as it came, refusing to detach his teeth as Izuku continued to hump into him.
Finally, after Izuku's cock rubbed against that spot inside of him a few more deliriously wonderful times, Katsuki's whole world froze in time. His body seized up and semen spurted out between the two of them.
He detached his teeth, gasping for air as the aftermath of what they'd done began to set in. His muscles had a nice, dull ache. His head was light and clear. Izuku's alpha cum continued to pump into him. It was a little weird, but it felt warm and nice to still have Izuku pressed against him.
Izuku slumped over on top of Katsuki, a look of complete satisfaction on his face.
They both slowly came down from their high, the room filled with nothing but the sound of their breathing as they were still locked together.
"You… you bit me," Izuku whispered in disbelief. He touched his neck, wincing at the blood that covered his fingers at the lightest touch. They were both claimed. They both belonged to each other.
"Is that a problem?" Katsuki asked, daring Izuku to say otherwise. Part of him was still waiting for Izuku to reject him, to say this had all been a way to make fun of him for his unorthodox sexual needs.
Instead, Izuku beamed and snuggled his head into Katsuki's chest. "It's only everything I've ever wanted," he said.
Katsuki didn't say a word for a long while, but he wrapped his arms around the boy on top of him and stroked his skin gently as they waited for Izuku's knot to deflate.
"I lied earlier," Katsuki said without preamble, "when I said it didn't make any sense that I was an omega." He paused. "I… I've wanted this for a while. I already kinda knew."
Izuku stroked Katsuki's cheek affectionately, looking at him like he made the world turn, just like he had always done. "I'm so glad you chose me," he whispered.
Katsuki huffed a little in annoyance but didn't pull away. "You chose me first," he said, trying to sound accusatory but failing. The silent knowledge that he was also glad hung in the air between them. He finally knew that his mate didn't regret biting him, and he would never regret biting him right back.
They fell asleep just like that, holding each other close, content in the fact that they would never be alone again.