"You gonna get up anytime soon, Evo?" Mirko taunted the fallen hero in training. A quick lunch break had been all the relief Saiki had gotten since arriving at the Rabbit Hero's home. The rest of his first day had been spent in intensive fight training. Much as he felt pride in his stamina, his durability, his endurance, the professional hero was fully capable of matching him and then some. She had at this point beaten him down to near unconsciousness seven times.

The purpose of the training wasn't to teach him to fight. He had enough basics learned on that front that she could trust in his simple responses. No, the purpose was to teach him how to make split-second decisions, what was the appropriate response to a situation, and to put that response into action without hesitation. A ranged quirk. Duplicate, decoy and diversion tactics. Area effect quirks. Melee specialists. All at varying levels of strength. That part was perhaps the most important. Dealing with weak opponents quickly could stop problems before they arose. Dealing with opponents of similar strength? Taking the initiative made pulling out a victory closer to a certainty. Dealing with stronger opponents?

Dealing with stronger opponents was perhaps the greatest problem for Saiki and what they spent the most time on. The simple fact was he had trained himself too well with his quirk. Only a handful of his classmates were on a similar level of strength. Only one almost certainly stronger. As such, his response for dealing with a stronger opponent was to have already trained himself to the point there were no stronger opponents. That was the attitude Mirko was determined to beat out of him. The fact that doing so actually played into that methodology didn't help. It was somewhat aggravating seeing him barely conscious, then in half an hour ready to go again, even stronger.

Maybe that was why she decided to kick him.

"Gu-huah!" he groaned in pain, rolling onto his side clutching his abdomen. "Okay!" he croaked, rolling to his knees, rising slowly, "Okay, I can, keep going." His hand still on his newest injury implied otherwise.

"Ooh, I forgot that one," Mirko gave a shark-like grin. Unnerving on a rabbit. "That's right! Fight through the pain! A real hero doesn't get to wait around for someone to kiss their boo-boos! Get right back into it!" Jumping back, she raised a hand palm out as she had many times, "Stronger than you, no holding back, pain doesn't matter, fight through it!" she rattled off the conditions for this bout and that was all the warning he got before she descended on him. He felt the ground shake as he awkwardly dodged away from her heel drop. His own leg came around to sweep hers, arms moving the opposite way to forcefully drop her to the ground. She went with the momentum, allowing the move only to grab his arms, flipping and using the reversed momentum to throw him down. He slammed face first into the ground with a sickening crunch.

"Are you done this–" time, she was about to ask, only to get forcefully interrupted. Saiki rolled, got a foot underneath himself and used it to rise, bringing his fists up to land a wild swing directly into her left tit. "Nngh!" she groaned, surprised, even more so by the sudden onslaught of fists hammering into her abdomen. She could see the blood flowing down his face. His nose clearly broken, skin of his forehead torn enough to show a hint of bone. The Rabbit Hero grinned. He was learning. Pain tolerance was a fantastic thing to have for a quirk like his, and a must for any hero. He was finally using that skill he accidentally gained the proper way. End the threat, no matter what.

But, the scenario was for the opponent to be stronger. And so she took one more punch and grabbed the offending arm, raised a leg and brought it down on the other side of the arm, forcing the boy to twist. She drove him to the ground again with a kick, his arm still trapped between her limbs, a quick twist!

Snap!

"GHHHH!" he screamed through gritted teeth as she let the arm fall limp. She stepped over his chest, and stomped on the other arm. No sound escaped him this time, just a silent scream of pain. By the time she repeated this treatment for his legs, tears were silently leaking from his eyes.

"Yeah," she said, leaning down and picking up her intern as he gasped with the movement, "You're gonna hate me by the end of this week. But it'll be worth it. You wanna be strong, so I'm gonna make you strong. Mind and body. Your quirk just gives us a neat little shortcut, even if using it isn't fun." She carried him back upstairs, not really caring much about the blood dripping on the floor. "How long do you take healing broken bones?" His mouth moved as he tries to force out an answer. "What was that."

"Hours," he answered, his voice hoarse, shaky. "At least."

"Perfect," the Rabbit Hero nodded to herself. "Just this once, I'll feed you and then toss you in bed to recover. You need to bandage up or anything?"

"Easier, if I do," he answered.

"Well, not big on making things easy for you so... Meh, screw it. You'll be fine." Without ceremony, she dumped him in a chair in the kitchen, not especially caring about it jarring his broken limbs.

Saiki sucked in a breath through his teeth, eyes screwed shut. "How did you even get your license if this is how you treat injured people?"

"Oh, don't get me wrong," she said to him, head buried in a cupboard. Sadly Saiki was in too much pain to properly enjoy her incredible ass being presented for him as she bent over wiggling back and forth. "I don't treat injured civilians like this. You're supposed to be a hero, right? You can take it. What doesn't kill you makes you stronger. Literally true in your case, huh? Lucky."

"Yep," he groaned, "Feeling so lucky right now."

"Besides, I'm not a rescue hero," she added, emerging from the cupboard with some instant ramen. "Never have been. I exist to beat the bad guys. Coddling people isn't my thing."

"Yeah, I get that," he nodded, lips twitching in irritation at the blood dribbling over them. "Definitely get that impression. Could you at least plug my nose or something?"

"Hm?" she hummed, looking his way. She sighed, rolled her eyes, grabbed a tissue.

Ripping it into halves, she bunched each up and none too gently shoved one in each nostril. "Nngh!" he grunted in pain, "Thagk you."

"Mm-hm." Mirko leaned against the countertop as she waited for the kettle to boil. "So, the lesson sinking into that super-hard head of yours yet?"

"What lessod?" Saiki asked, wincing at the discomfort of talking with a broken and blocked nose. "Do you have to bake be talk dow?"

"Oh quit being a baby," the Rabbit Hero groused. "I'm the number eight hero right now. Do you know what that means?"

"That you're really strogg add popular."

"I am really strong," she agreed. "The popular thing too. Here's the funny thing about the billboard rankings. It's super favoured by popularity more than activity or success rate. All Might doesn't really work much nowadays especially since taking a job at UA. Yet he's still number one even though everyone knows Endeavour does way more hero work. Endy isn't even unpopular. He looks cool. I mean I like him." She shrugged. "My point is, I'm number eight. You know how that happened?"

Saiki wasn't about to cause himself pain just to try answering a rhetorical question.

Mirko smirked, taking on a pinup pose. "Because I'm a badass bunny girl with a great ass," she answered her own question, giving that ass a meaty smack for emphasis. "It'd be great if that wasn't such a big factor, but that's the world we live in. Ryukyu is a hundred percent definitely stronger than I am. But she turns into a weird-looking dragon lady and that doesn't get as much appreciation." She walked around to Saiki's front, leaning down just a little to look him in the eyes. "You'll get stronger thanks to your quirk. Maybe by the time you leave you can hang in the ring with me for a few hits without going down. Maybe in a year or two you could go toe to toe with me. Doesn't matter. No matter how strong you get, there's always someone stronger."

Saiki scoffed in the back of his throat. "Tell that to All Bi–"

Oh.

Saiki remembered. It was more than a month ago at this point. But... The USJ incident. He remembered what happened that day. The battles he witnessed. All Might came in swinging and he won in the end but... It wasn't a sure thing by any means. They had almost got him when he was trapped in that mist villain's gate. If it weren't for Todoroki and Katsumi jumping in...

Mirko stood straight again with a smile, arms folded under her bust. "By that look on your face, I think you're starting to get it. A fight like that can happen any time. And what will get you through it is grit, instinct, training and a refusal to give in no matter what. It's not over until you're dead." Her eyes flicked upward in thought as the kettle clicked. "Even more so in your case," she added as she poured water onto the noodles, stirring them as they soaked. "There we go. Now you should feel lucky," she told him as she brought the bowl to him and pulled up a chair of her own. "You have any idea how many men wish they were in your position right now?"

"Wid broked arbs add legs?" he asked incredulously, only for her to take that chance to jam food in his mouth.

"Funny enough? I've seen someone on one of my fan sites say he'd feed his legs through a woodchipper to do lovey-dovey shit like this with me. Now say 'ahhhh'!"

As she carried him to his room and dropped him onto his bed a half hour later, Saiki couldn't decide whether the woman was a straight up sadist or just cared that little for his well-being.

But... Outside his room, Mirko, Rumi Usagiyama was forcibly calming her heartbeat. A series of unfortunate effects all converging at once and doing terrible things to her body. Rumi Usagiyama was a rabbit woman. And the thing about rabbits is they have an extremely long and active mating season that runs from spring to the start of autumn. During that time they, well, fuck like rabbits.

From a young age, Rumi knew that was something she did not want to have to deal with, nor would her school. Doctors got involved and she was provided specific medication that would dampen the effects and urges of her mating season. It took some work. As a result, she lost her virginity at fourteen and was very sexually active during the summer months of that year. By the time she was preparing to enter UA they had concocted a solution. During mating season she took a medication that pushed down her need to have sex. Mostly. It wasn't perfect. The major failing was that if she got into a situation that she found especially arousing, her need came through again for a little while.

Normally, this wouldn't have been a problem. For all that her costume was sexually provocative, Rumi wasn't a particularly lustful woman beyond the nature of her quirk. She enjoyed fighting far more than fucking. And therein lay the problem.

She enjoyed fighting. She enjoyed it a lot. The chance to test her physicality, to really let loose on someone, it was an experience deeply satisfying for her. Taking in an intern who would let her beat the shit out of him until he collapsed, only to heal up and come at her again? She couldn't imagine a more fun time. However, even that wouldn't have been enough to truly push her buttons. No, the final thing that pushed her over the edge was that her intern, Saiki, he was strong. In body yes. But also in mind. If he had been some weak shit with a lottery-winning quirk she wouldn't have cared. She wouldn't be feeling the heat between her legs that she was.

A single day. That was all it took for him to take her lesson to heart. To fight through the pain and come at her no matter what. Even after she snapped his limbs like twigs he did nothing but talk shit like it was no big deal. She couldn't be more glad that he couldn't see how stiff her nipples were or how wet she had gotten through her leotard, nor smell her arousal thanks to his broken nose. If he had, she might have just said fuck it and ridden him right then and there. If he could already tell and her heat wasn't going away, what difference would it make if she got some relief?

Thankfully, he hadn't noticed. She was safe. Safe to take a long, indulgent shower, then go on patrol. It was getting to be about that time anyway.

-(-)-

"Alright. Take a break," Mirko offered with an absent wave. "System. Ring off." With a whirr, the walls surrounding the sparring area receded, letting her head for a refrigerated shelf with some chilled water bottles. Tearing the cap off one she douses herself with it, then did the same with another to drink. "Ahh, good stuff." Just what she needed to cool off.

"Can I get one of those?" Saiki requested.

"I dunno, they're right there. You feel up to the challenge of walking across the room, hero?" the Rabbit Hero asked sardonically.

The intern rolled his eyes, thought for half an instant about doing something stupid like smacking her ass as he walked past her...

A loud smack echoed through the basement. She was gonna kick his ass either way. As his palm cracked against a beautifully round chocolate cheek, his eyes widened in wonder. His palm raised in front of his eyes as he stared at it, his expression euphoric. "Holy shit, your ass is perfect!"

He barely reacted as her foot slammed into him, throwing him across the room and into a pile of weightlifting equipment. He ended up with his body hanging off of a bench by his legs, his shoulder resting on an iron bar. "You alive?" the rabbit woman asked, not entirely sure how much she cared about the answer.

"I'm alive," he answered, voice screaming pain but it was starting to feel like his natural state of being at by now. "Totally worth it."

"And you're damn right it's perfect!"

That altercation extended the break by another half hour as Saiki let his shoulder heal up sufficiently. Given the opportunity, he decided to sit down and check his phone. He had heard it buzzing earlier but with a violent rabbit bearing down on him he couldn't give it his attention. "Huh. That's weird." Mirko didn't acknowledge his prompt, focusing instead on towelling off sweat, but he continued despite her disinterest. "I got a message from one of my classmates but it's just a location. Somewhere in..." He pulled the map back to get a wider range. "Hosu? The hell is she doing in a back alley in Hosu?"

Mirko snorted. "Maybe she's fighting the hero killer," before taking another swig of water. Not noticing the sudden panic her words caused in her intern.

"Shit," Saiki breathed, "Shit!" Suddenly his finger frantically moved across the screen, checking news sites. "Come on, Izuku. Just this once, just this once don't be a suicidal moron, please please please–!"

Finally, he found an article with pictures, the headline reading 'Flame Hero Endeavour Takes Down the Hero Killer!' There were several pictures. Through them he managed to spot Izuku, Todoroki and Iida looking various levels of injured, but alive. "Oh thank gods," he sighed, shoulders slumping in relief.

"And here I was thinking it'd take something extreme to freak you out," Rumi thought aloud. "So what happened?" Without thinking, Saiki tossed his phone at her, the Rabbit Hero snatching it out of the air. "Huh. Hero Killer's done, huh? Another win in Endy's book. Oh, I get it. These are your classmates aren't they? I recognise Tits McGee there, and Endy's son. You were really worried, huh?"

"Yeah," Saiki admitted, catching the phone as she chucked it back at him, "Izuku... She has a bad habit of jumping into the middle of things. Kind of like you do, but Izuku doesn't think at all. Even if she doesn't have a plan she just acts. It's gotten her in trouble before."

"Aww, worrying about your little girlfriend, that's so sweet. Wait," she interrupted her own sarcastic cooing as a realisation came to her. "Didn't you go on a date with that Yaoyorozu girl? I see how it is," she smirked, folding her arms under her breasts as she looked down on him. Something only possible because he was sitting down. "So you're that kind of guy, huh?"

"No idea what you mean," he answered with the kind of casual disinterest that said he knew exactly what she meant.

"Hey, not to worry," she assured him, "I'm not one to judge. We're all slaves to our urges."

Saiki wasn't sure whether to believe her, what with her following up that assurance with a dropkick into his sternum. And so ended another day of learning under a pro hero.

-(-)-

The third day was largely spent on patrol. Actually running through the basics of the hero job. Giving Saiki a feel for what the work was like on an average day. Mirko's approach to patrolling seemed to be just run through the city and stop crime, barely taking a moment to slow down. Then after that take some time to do the highly visible hero routine, meet some fans, raise her profile a little with people. Then right back to high speed patrolling.

"So. Let's talk about what your quirk actually does," Mirko said as they stop for lunch. A food stand that was happy to let them eat for free since a top ten pro hanging around was only good for business. "Because right now? You're not very flashy. In fact, you're kind of lame."

"Says the most ferocious rodent. OW!"

The Rabbit Hero's teeth flashed as she ground her toes into his suddenly very bruised foot. "The backtalk is cute but don't make me do something I'll regret."

"Okay, fine, why do you think I'm lame?" he asked through gritted teeth.

"Oh, not you personally. But as a hero? Super lame. Like, look at you." She waved a hand up and down at him. "Your costume is... fine, I guess. Nothing special. And your quirk? It's not flashy at all. Maybe one day if you get All Might levels of strong. Do you have an upper limit on how much your body can improve?"

"Quirk doctors don't seem to think so. Or if they do, they have no idea what it might be."

"And that's great for the long term. When you get naturally powerful enough you'll have no trouble. But until then, you need something that'll let you really wow people if you want to be a popular hero, you know?"

"Like being a bunny girl with a great ass," Saiki nodded solemnly at her wisdom.

She punched him in the back of the head. "Exactly."

"But I don't have anything like that," he shrugged. It was a problem he'd known about but not had any way to resolve, leaving him to put it off and hope it resolved itself by getting strong enough. "My quirk is regeneration and improvement. How do I make that flashy?"

"Every quirk has the potential for a super move, even the kind of shitty ones," Mirko dispensed even more wisdom. "Think about mine. Most of 'em are just really flashy kicks with a fancy name. So, your quirk is regeneration. Is that from anything?"

He shrugged. "As long as it doesn't kill me. But it's too slow to be showy."

The pro hummed to herself. He wasn't wrong. His broken bones had been healing at an astonishing rate, but only by normal standards. Overnight healing was impressive and useful, but not to a civilian who wanted to be wowed by heroes doing incredible things with their quirks. "And different types of damage take different amounts of time to heal."

"Yeah. I mean it depends on the severity of the damage, still. A broken bone causes all kinds of damage of different types so it takes a while to recover."

She pursed her lips. "What about... Something that does some short-term damage but would build up over time with repeated use?"

Saiki gave her a strange look, not knowing what she was talking about. "If a normal person were to recover quickly, it would take me no time at all. And then I'd better tolerate the damage in the future. That's how it works for everything."

The Rabbit Hero didn't smile as an idea began to coalesce in her mind. How feasible it would be... Well, that would depend. While she wanted to tell her intern, it would be better off if she were the one to suggest it to those he would need the aid of than for him to try himself. "I need to write something up for your teachers. Remind me when we get back."

"Okay...?"

-(-)-

By the end of the fourth day, Saiki was confused. The morning had been odd compared to previous ones. He would train with Mirko, she would kick his ass back and forth across her basement, he would heal, and then they would start over again. This day, Mirko seemed less willing to go for debilitating blows. Instead, a strange number of their altercations ended with her straddling him. Then she would get irate, knee him in the groin, and take her position again.

"Enough!" she declared finally, looking supremely pissed. "We're done for the day!"

Saiki dove backwards away from a kick that went directly counter to her declaration. "What the hell, Mirko?!"

"I'm gonna cripple you so you can heal again like you do every day!"

"That's fine if I'm gonna sleep but the day's barely started!"

She looked very much like she didn't care about that, but after a moment relented with a stomp. "Fine! Do whatever, I don't care!" With that, she stomped off back upstairs.

Saiki was left to only blink after her. Shaking his head to dismiss his confusion he got to work on training his body in a more traditional fashion. The equipment was right there after all. Designed specifically for people with superhuman abilities.

A couple of hours later he emerged from the basement, ready to get something to eat before getting back to it. However his advanced hearing distracted him, picking up sounds coming from somewhere in the house. Following his ears, he soon didn't need to anymore. His nose joined in on tracing the strange phenomenon. A scent on the air, slightly different but still largely familiar to him. A scent that brought a wicked smile to his face. His phone was soon in his hand as he followed the sounds of muffled moans and the low hum of a vibrator at work. So it had been this kind of frustration that Mirko was feeling. And why she was so determined to put him down before going to deal with it. What a shame for her.

As he moved down the hall toward the door the sounds were coming from, he quietly cracked it open, camera already recording. He didn't bother going for a good look himself, he could see enough. Better to enjoy the show for longer than to get greedy and get caught.

"Fffffuck," Mirko groaned in frustrated pleasure as her body undulated, hips moving with her hand driving her vibrator into her soaked pussy. "Fucking kid, fuck!"

So she was thinking about him, Saiki realised with a grin. Well–

"Fuck, are you coming in or not?!" the sweaty, chocolate-skinned heroine shouted at him.

So much for not getting caught. His phone hidden behind him as he entered, soon finding a place on a nearby shelf obscured by a book. He didn't even pretend at a guilty expression. "So this is why you were so angry at me."

She didn't acknowledge his comment. There was only one reason she called him in and it wasn't to engage in banter. "Here's the deal," she told him, legs coming off the bed to stand fully bared before him, not a hint of shame. "You're not going to tell anyone about this, and I'm going to ride you until your hips break."

"Don't threaten me with a good–"

"Shut up. Clothes off. Now."

With a flick of his finger at his neck, the seam of his hero costume split to reveal a zip that was swiftly undone. The whole suit came off, followed by his underwear.

"Not bad," Mirko commented with a smirk, fingers sliding to her pussy again. "On the bed."

It was a novel experience for Saiki, letting the woman take the lead. With Juri he had trained her to be his little slut. With Katsumi it was a similar process even if she still somehow hadn't quite realised it. Here though? Mirko was a woman who knew what she wanted and he was more than willing to give it to her. After the sight he entered on, he was already rock hard and ready to let her fulfil her promise.

With perfect accuracy, the snow-haired chocolate heroine hopped onto the bed, her feet slipped back to drop her to her knees above him, her soaked slit hovering an inch above his cock. Saiki was only given enough time to realise that before she dropped herself fully onto him, impaling herself on his shaft with a euphoric expression. "Yesssss!" she hissed, "This is it! A real dick! I needed this!" She immediately started bouncing, wet slaps of her juice-soaked crotch slapping against his, leaving strings of her girlcum connecting and breaking over and over again. Her ample breasts with diamond-hard nipples bounced freely. They were a tantalising image and they called to Saiki but there was only one place his hands would go.

With both hands, he reached around her to grab two big handfuls of Mirko's generous, firm ass. Squeezing. Massaging. Groping her greatest asset with great strength. Even so, "Harder," Mirko demanded, "Fucking spank me!" Smack! Just as she taught him, he didn't hesitate. "Yes! That's it! I'm such a slutty bunny! Do it again!" Smack! "Yes!" Smack! "Yes!" Smack! "Yessssss!" Her body vibrated atop him, her hips twitching as she came hard around his cock.

It seemed to Saiki she was into the rough stuff. One hand was still gripping her ass, encouraging her to keep riding him, to keep bouncing. Meanwhile the other rose. Smack! His palm swatting across her bouncing tits to send them wobbling one way then smack backhanded them the other way.

"You– FUCK!" she screamed, "You little shit!" she snarled with a feral grin, bouncing harder as though to punish him. Hard enough that he genuinely did feel his hips bruise but he wasn't about to let her win.

Sticking a finger in the corner of her lips, he pulled her head down towards him, "You're a little bunny slut, aren't you?" he asked firmly, grabbing hold of a soft tit with his other hand. "Say it!"

"Yeah, I'm a little bunny slut," she slurred with that same grin still on her face even with the fishhooking finger tugging at her lips.

"You're my little bunny slut," he corrected, fingers closing on a nipple and twisting roughly.

She groaned in pained pleasure. But even so, "You wish," she slurred at him.

Even though he wanted to punish her, to flip her over and ram her into the mattress, there wasn't much he could do about it. In truth, she was stronger than him. She was in control. It wasn't his preference but if it meant he got to fuck an incredible piece of ass like Mirko he'd take it. He'd happily grope and get his enjoyment out of her body while she got hers out of his. Before long her powerful slams successfully milked out his release. As she felt his copious volume of hot cum spurt up inside her womb, Mirko's tongue hung out of her mouth, lost in the ecstasy of getting what her body had craved since the first night after Saiki arrived.

Saiki breathed hard, his hips and pelvis hurting, not that he had any intention of letting that show.

"Alright, time for round two," Mirko suddenly said as she came back to awareness.

...

... Uh oh.