If Saiki had known what he would be in for when he first heard Mirko's sounds of self-pleasure... Yeah, he still wouldn't have done a damn thing different. But even his resolve that he made the right choice didn't change the past few days had been the greatest ordeal of Evo's young life. Including the USJ incident. Mirko was simply that fierce when she really got in a mood.

The first session, if it could be called that, lasted twelve straight hours. It had seemed implausible for Saiki at the time. To think that her desires were so utterly insatiable once they had been triggered, to think he would be able to last that long. In the future it would be something he would be thankful for but on that day his quirk was somewhat working against him. He could become exhausted. He could become spent. But Mirko's insistence that they keep going, a transcendentally erotic, beautiful and powerful woman egging him on. He was unwilling to back down from a challenge. And while Mirko rode his only half-hard cock, his quirk came to his rescue.

His experience in sex had cut down his refractory period already but the sheer unending strain put on him by Mirko's demanding libido removed it entirely. His cock was constantly ready to spring back to full attention. His balls evolved, improved to the point that they could legitimately be called sperm factories, generating and pumping out fresh seed at an impossible rate. He could go on and on, getting ridden by a muscular bunny woman from midday to midnight. Only when the injuries to his pelvis got too much did Mirko show mercy by giving him a break. Time to heal.

Those were the results of the first day.

The second day? The seal had been broken. The insatiable rabbit wanted more. Shovelling down food and desperately needed fluids, it soon all began again. A new day, another endless sex marathon. Another challenge he couldn't refuse. It was on this second day that the Rabbit Hero's stamina actually started to flag, finally letting him take control. The white-haired, caramel-skinned hero had no complaints as long as he continued to give her what she wanted. And for the time being all she wanted was more of his soothing cum dousing her burning womb. He gladly continued to pound her from behind, using her ears as reins as he slammed her cunt again and again.

That was the second day. And technically the end of his internship. But, as Mirko awoke from her sex coma the next morning, Saiki finally having made her submit first the night before, she offered an idea. The internship was intended for him to work for her... But there was nothing stopping him spending the rest of the weekend with her as a private citizen. Giving her more vigorous fuckings, filling her with more doses of that wonderfully warm cum.

Little did either of them know that Saiki's quirk had evolved his body yet again. The exhaustive stress and strain of his body in a specific state for such an extended period would lead to no other outcome. Even in his own personal training he had never put himself through the wringer like this for one specific purpose. His balls had swelled. Improved to fill even faster. The simple fact was the entire experience had left him more or less sexually inexhaustible.

Had she had time to think clearly Mirko might have had enough on that Saturday morning. But being bathed in his scent for two days straight, her mind already muddled by her unleashed mating instincts, with him right there ready to go again... She didn't stand a chance.

"Fuck! Fuck! Fuck! Ah! Shit! Fill me again! Fill me! Fill me!"

And that was how Mirko spent her Saturday in a mating press, her legs locked behind her head as a teenager slammed her bruised pussy to his heart's content. And with the exertions of the third day that teenager's body evolved yet again. He didn't go soft anymore. Not fully. His cock, thickened and lengthened in response to the squeezing forces acting against it, no longer went flaccid. At minimum it would be half-hard, ready to rise to action at only a whiff of arousal.

But as Mirko awoke on the Sunday, lying in bed with the boy who was supposed to be her intern, her poor pussy throbbing from the abuse she had put it through, she knew she had hit her limit. Damn the kid for his stamina and regeneration, he had beaten her. No matter what her instincts were still screaming at her, she couldn't go again. She needed to heal and she didn't have a cheating quirk like the kid. So on that day Saiki awoke to Mirko leaning heavily on the wall keeping her distance from him, telling him it was time to go home.

His upper body rose, turning into a stretch that was half waking his muscles, half putting on a show for the caramel-skinned woman doing her best to keep her distance. The flush that came to her face was delicious. "Really?" he asked, throwing off the covers and standing to his full height, letting his newly hefty package hang free for her viewing pleasure and temptation. "You want me to leave?"

"N–" she almost broke right then and there, biting down on her lip until it bled to kill the word. "I need you to leave," she answered instead.

"Is something wrong?" he asked with a grin. "We were having so much fun."

"Don't make me say it," she grit her teeth.

"Say what?" he asked taking a step toward her.

Only for her to hold a hand out to stop him. "Fine. I can't fuck anymore because you wore me out and turned my pussy into one massive bruise. Happy?"

"Eh, yes and no," he answered with a shrug and a lopsided grin. "On the one hand it's pretty gratifying to hear I out-fucked a top ten hero. On the other, I kind of wish I could get one for the road." He tapped his chin with a finger. "Tell you what, how about a compromise."

"I already told you I can't–"

"Relax, all you have to do is get on your knees."

She gaped at him. "You can't be serious."

"Get on your knees and worship my cock and then I'll leave," he promised, speaking like it was an entirely fair deal. He already figured she was impossibly enamoured with him and was perhaps now feeling a little vengeful for her using him as a sex toy on that first day. Even if he was happy with the results.

Rumi sighed in resignation and defeat. She knew if he pushed it she'd just spend the whole day on her back or with her ass in the air and she couldn't exactly fight him off with her lower body as stable as jelly stilts. Slowly, carefully, she used the wall to lower herself down to her knees and knee-walked over to him. "It's like inches and miles with you, isn't it?"

"You wanna talk about inches? You gave me a couple," he joked, stroking himself just a little as she approached him. He watched her take a breath in through her nose and shudder. "I think you've got a job to do, Mirko. I think I wanna feel those inches you gave me in your throat."

"You're such a little bastard," she said but the insult was undercut by her lustful panting as she breathed in the scent of his already hard cock. If she had more harsh words for him they were utterly lost as her lips parted and wrapped eagerly around the head. Her cheeks hollowed as she sucked, her tongue swirling around his glans before she bobbed forward. Her lips slid back and forth over his shaft. Her tongue coiled around as she licked and sucked, one hand stroking the rest of his length. The other came underneath to cup and fondle his engorged balls, completely full and swollen thanks to the rest he had taken. Her lips came off of his cock with a loud pop, both hands going to work on jerking it. Her mouth sucked eagerly on one of his balls, her nose buried in the base of his shaft to drink deep of his odour.

"That's right," Saiki sighed in pleasure, feeling this was the perfect capstone on his internship. "That's what you love isn't it? You need my cock, don't you?"

"Mmmh!" she groaned, unable to answer better with her mouth full.

"You're a little bunny slut, aren't you?"

Her mouth came free, mind a haze all over again. "I'm a little bunny slut."

"You're my little bunny slut."

"I'm your little bunny slut."

And there it was. No hesitation. No matter how she felt about it, she knew it was true. Exactly what Saiki needed to hear from her. "Then suck it, bunny slut."

No hesitation as she filled her mouth with cock once again. Only this time Saiki put his hands on the sides of her head and pulled. Suddenly the few inches she had been pleasuring drove deep into her throat for her to choke on, her nose flush with his crotch. She gagged, her eyes watering as he held her there, letting her choke and splutter with her gullet full of dick meat. After around ten seconds of that he pushed her back but not out of mercy. He gave her only enough time to get a worthwhile breath before ramming her throat hole again. The cock worship was fun but he wanted to show her just what his bunny slut was for. He mercilessly facefucked her, using another one of her holes for his pleasure the same as he used her pussy and she used his cock. This sexual relationship didn't start out of mutual respect and trust. It started because one of them needed a good fuck and the other was happy to oblige. The only thing that had changed was who was in control.

It was always going to be Saiki, no matter how long it took. Top ten hero or not, Evo refused to be a dildo to be used and discarded. Mirko was his fucktoy, not the other way around.

"I'm gonna cum, Mirko," he told her. "I'm gonna fill your bunny slut belly with my cum just like I did your pussy."

She wasn't capable of saying a word, or even letting out a hum of acknowledgement. The hero's eyes had started to roll back. With one final grunt and thrust he dragged the rabbit woman down to the base of his cock one last time as jet after jet of hot cum flowed down his bunny slut's gullet. As the flow began to wane he pulled out a bit to let the dregs fill her mouth, then pulled her off completely. Even as she dropped bonelessly to the floor she swallowed the sticky white substance before taking a breath. Her hand slid down between her legs only for her to wince and for that hand to retreat.

Saiki squatted down to get closer to her face. "See? That wasn't so bad, right?"

Her head shook, both as answer and a means to clear the haze on her mind just a little. "You need to go home now."

"Yeah, you're right," he agreed with a nod, "I should take a day to relax from all this hard work before I get back to school. But hey, I'd be happy to come back sometime and give you more of what no one else can, my little bunny slut." He snapped his fingers as he came to a realisation. "How about next Sunday? Sunday Bunday, how's that sound?"

He didn't wait for her to answer, just picked up his clothes and left her bedroom.

Her pussy throbbed. She wanted it right then but was in no state. She knew even when she threw out the sheets, cleaned the stench of his cum and their rutting from the room, her body would remember. She would still want more.

She scoffs, the taste of his cum still on her tongue, the smell still in her nose. She knew she'd invite him back. Her body wouldn't let her do otherwise.

-(-)-

Saiki returned to school the next day with a spring in his step. A combination of factors. Relief that the incredibly harsh training he endured was over. Satisfaction from even temporarily turning a famous hero into his pet. Accomplishment that he managed to put a huge dent into one of his flaws, something he could continue to work on to remove it completely.

It was easy to tell the students who had similarly satisfying experiences. The ones with just that little bit more energy coming back. Tsuyu (as she insisted people call her) walked with a straighter back, her head held higher. Iida by comparison looked like his internship left him stoic and contemplative. A damn sight better than what he was like going into his internship at least.

But no one seemed more energised than the girl he ran across at the shoe lockers. "You're pretty chipper aren't you," he observed aloud as Jiro used her jacks to pull out, spin and deposit her shoes on the ground.

"I guess you could say that," she answered with a smug smirk, switching shoes and depositing her outdoor shoes in her locker with her jacks. "Though you're one to talk. I guess your internship went pretty good too."

"I guess you could say that," he echoed back at her with an equal amount of smugness. "What did you end up doing?"

"I interned at Death Arms' agency. Helped out in a hostage situation, no big deal," she humble-bragged, brushing imaginary dust off her shoulders.

"I notice you're using your quirk more."

"Yeah, Death Arms gave me some advice to use them for anything I don't need my hands for. Improve their dexterity."

"Looks like that's going well."

"Thanks," she accepted the praise easily. "Well? What did you do?"

"I got brutalised by a top ten hero for a week straight," he answered proudly. What she did to his crotch still counted as brutalising as far as he was concerned. He was there. It certainly felt that way.

She gave him a strange look. "That doesn't sound like a good– Wait. Oh no."

Saiki enjoyed the look of realisation and horror that rested on the tomboy's face. "Yep. She kicked my ass for ten hours a day. Every day ended with broken bones at least. Also I got to watch her kick ass on patrol so that was fun too."

"Broken–?!" the punk girl yelped, "Dude, are you some kind of masochist?"

"I'm gonna be the best," he answered as he shut his own shoe locker, "The number one hero. Whatever it takes to get me there is a worthwhile cost." He smirked at her again. "And no, I'm not a masochist but," He moved around her only to crowd her personal space, encourage her to edge backward, her back against the lockers, "If you want to experiment, you just let me know."

He didn't stay to listen to Jiro's stammered denials, happier to make his way to his classroom. Only to run across someone else. His eyes widened.

"Hey S–" Izuku didn't get further than those words and raising her hand to wave before Saiki was grabbing her by the shoulders, checking her over for injuries. "Uhh!" she uttered, red faced.

The blue-haired boy saw the still healing mark on her face, the only visible injury. Accepting that she was fine he wrapped her in a hug, not caring in the slightest for her embarrassment. "You got me so worried sending me that message. I thought you'd done something crazy and stupid again. The only reason I didn't freak out was seeing the news stories and seeing your picture."

"U-Umm!"

He pulled back, looking her dead in the eye. "I know we're gonna get into some crazy shit sometimes, but next time let me know you're okay, okay?"

"I... Yeah sorry could, c-could you let go?" she asked meekly, inwardly shouting down the part of her that really didn't want the very pleasant hug to end. Mercifully and disappointingly he did so, letting her collect her thoughts. "I'm sorry, a lot was happening all at once. When it was over I didn't really, I don't know. I guess I wasn't thinking."

"It's okay," Saiki sighed fondly but with audible concern, "I just worry about you sometimes, you know?"

"To be honest, I don't think I can be the kind of person who doesn't get wrapped up in dangerous situations. I can't promise it won't happen again," Izuku admitted, "But still! I promise that one day I'll be strong enough that you won't have to worry about me, no matter what happens!"

Saiki took in her determined appearance, shaking his head as he opened the classroom door. "You really need to work on reassuring people, you know that?"

A little while later the class were settled in ready for homeroom. Aizawa was in much better shape as he entered. The facial scars were hard to ignore but only earned the man more respect from his class. It was impossible for them to forget how he got them after all.

"Alright," he spoke, as energetic as ever after taking roll. "You've all completed your internships. I hope all of you came away from them having learned something about what it means to be a pro. Be sure to show what you learned in your hero studies classes. We'll be watching your progress ahead of your final exams. You've gotten a vision of the future but now it's time to get back to focusing on your studies."

"Mister Aizawa," Saiki raised his hand.

"What is it, Saisei."

The boy frowned, feeling a touch awkward. "The hero I interned with, she told me to give this to you when I got back to class.

The longsuffering teacher sighed tiredly and extended a hand. "Give it here."

He took the sealed envelope. A strange thing for a hero to do, having a student carry a message instead of pass it through the school's system. One hand propping up his chin he opened it and pulled out the letter, eyes scanning the contents. Suddenly, he sat a little straighter. "Saisei, what is this?"

"Honestly have no idea, sir," he admitted easily even if he was confused by the teacher's sudden alarm. "She told me not to look at it, that it would be better if it came from her, whatever 'it' is."

The teacher's eyes scanned for signs of a lie but found none. Satisfied with that at least, he read the letter in more detail.

Dear Eraserhead

Ugh, writing letters is weird. Who calls anyone 'dear'? Especially people they don't know? Whatever. I'm writing for the sake of maybe boosting the kid's progress. Saiki Saisei. Evo. That kid. He's hit a brick wall when it comes to making himself appear more heroic. He can walk the walk doing the job but being showy about it is gonna be a real struggle for him until he gets that quirk of his pushing him to crazy limits. I looked you up so I know you don't really care about being showy but the kid does.

My suggestion is to work with medical experts (Recovery Girl is still on the UA faculty, right?) to work up an appropriate course of stimulants that Evo can use to amplify his abilities and use the full extent of his strength. While it would be a dangerous thing for most people, the strain on Evo's body would be minimal and quickly recovered based on his own explanation of his quirk. The idea is a little unorthodox but considering what the kid's quirk does it should be a huge boost to what he's capable of with no drawbacks. In the end it's up to you as his teacher whether you act on it but for the sake of the kid's growth I hope you do. Even if you aren't interested in teaching your students to be showy, this could be a way to keep the kid alive while he's still a baby hero. I've got faith he'll be pretty amazing if he lives to see his full potential.

The kid doesn't know what I've written here so if you don't wanna do it just blow it off as a suggestion for his training and go on as normal. But again, I hope you give this idea due credit. If ever there's been a student in your school who embodies Plus Ultra, well there might be others who take it to his level but I bet it isn't a high number.

Sincerely

Rumi 'Mirko' Usagiyama

'Unorthodox' she said. Giving a student access to restricted substances and calling it support equipment. That went a little beyond 'unorthodox'.

But...

Aizawa's eyes narrowed slightly as he stared at one of his best, if most problematic students. The logic was sound. The practicality was sound. The legality... There would be no way to swing it before he received a provisional license. But if he managed that, it was certainly a possibility.

He would make sure to ask some very circumspect questions of Recovery Girl over the next few days. Feel her out on the subject. Mirko might have been dismissive of his own approach to heroism but she was right about one thing. Aizawa wanted to see his students reach their potential. He wanted them to live long enough to do so. And with this League of Villains group, with the Hero Killer spreading unease and dissatisfaction among the people, the safety of his students was getting harder and harder to ensure.