15 Part 1: Nana(My Hero Academia)

(This is AU, Where Nana Shimura(All Mights' predecessor) is still One For All's user)

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Nana Shimura barely looked at the sludge villain, which she'd just freshly defeated for the second time today. She didn't even spare more than a cursory look at the blond young man the villain had been attacking. The other heroes could help him now that the fighting was done. She had eyes only for the young man who had run in to save him despite having already admitted to her that he was quirkless. There was absolutely nothing he could've done to hurt the villain, yet he'd tried anyway. Rushing in and putting your life on the line to save others; that was the mark of a true hero. Maybe she'd misjudged him earlier.

But even though she'd begun to think about stepping back and hanging up her hero's cape to live a life out of the spotlight, she didn't find her eyes drawn to Izuku Midoriya for the purposes of making him her successor and the eighth user of One For All. It was for a decidedly less noble reason that she breathlessly walked towards him. Even the #1 ranked hero and the seventh user of One For All was not immune to the wants and desires of any other normal human, and she had never wanted a man like she wanted him in that moment. Never before had her body ached for the touch of another like this. Her brain could focus on only one thing: claiming his cock as her own and never letting it or him go until he'd mated with her and impregnated her. It was a wild thought; while she'd always thought she'd like to have kids some day, likely after retiring, she'd never felt the pull towards motherhood this strongly. Judging by the desperate look in his eyes as he watched her approach him, she was sure he was feeling the same irresistible pull to fuck her and never stop fucking her until he was sure he'd knocked her up.

Neither of them knew what was driving their lust to such unprecedented levels, but there was actually far more to it than met the eye. Izuku Midoriya, contrary to what he'd always believed, was not actually quirkless. No one, not even the doctors that had examined him, had been able to detect his quirk, but that didn't mean it wasn't there. It had simply been a latent quirk that didn't manifest itself until that particular moment.

When Izuku became truly attracted to someone, desiring them beyond merely thinking they were cute, his quirk would activate and release pheromones that would affect both himself and the female. The pheromones sent both of them into a frenzy of desire for each other and filled them with an all-consuming need to mate with each other, to fuck over and over again until the woman was impregnated. The work of the pheromones didn't stop there though. Once his quirk activated, there was no turning back. The woman would continue to desire him and his cock, and eventually she would fall in love with him.

Nana knew none of that, and neither did Izuku. They didn't have any clue why they were drawn to each other so strongly. They just knew that they had to have each other, and they had to have each other right now.

"Sh-Shimura-san—" Izuku said, his voice shaky. She could see his arms shaking at his sides, likely because he felt the urge to touch her and was doing all he could to stop himself from doing so. It was admirable, but it was also the last thing she wanted. She wanted to feel his hands on her, wanted to feel his cock inside of her, wanted him to strip her and fuck her and breed her. She wanted it, needed it, and she needed it right now. This wasn't the place though. They were still out in the open; she'd just defeated the sludge villain, and they were surrounded by heroes. She couldn't fuck him here, not without disgracing her public reputation forever.

"Come with me," she said. She grabbed him by the hand and led him away from the scene of the battle with her powerful grip. She moaned as soon as her hand touched his skin, but she forced herself not to pounce then and there. She needed to find a more secluded spot, and then she could make him hers. Or maybe more accurately, she could make herself his.

--

"Good enough," Nana said. It had been torture to feel his skin against hers but not act. She'd grown uncomfortably wet inside of her bodysuit and had been rubbing her thighs together as she walked. Her entire body felt like it was on fire while she searched for a suitable place, and now she'd found it. The back alley behind a couple of deserted storefronts wouldn't see any random passersby, and she kicked over a large piece of metal to block the path and discourage anyone from even thinking about entering the alley. She needed as much privacy as she could manage, because things were about to get hot, heavy and loud.

"Shi-Shimura san, I—"

She cut off Izuku with a kiss on the lips. This was no mere peck; now that she finally had the privacy she required, she unleashed all of the passion and lust that had been building up inside of her. Her strong, sculpted body pressed against his, pushing him backwards until his back hit the brick wall behind him. She kept him there, cupping his cheeks in her hands and pressing her body flush against his while she shoved her tongue down his throat. Nana pulled back panting moments later, but only because her hormones demanded more than mere kissing, no matter how heated it was.

"Get your clothes off," she said. While Izuku hurried to strip out of his civilian clothes, Nana dealt with her hero costume. She had been waiting far too long to take the time to care about undressing seductively. She threw off both the cape attached around the back and the one hanging over her shoulders and tugged off her belt and gloves. The white knee-high boots she left on, which just left her dark bodysuit. She didn't need to pull it all the way off, at least not right now. There was only one part of her body that needed to be available to Izuku right now, and exposing just that one body part would be faster than peeling the entire suit off of her. Since speed trumped logic at the moment, she simply ripped a hole in the crotch of her bodysuit, freeing her pussy to the open air. Now he knew her naughty secret; she never wore anything underneath her bodysuit. She loved the feeling of the tight material pressing against her bare skin, and also got a little thrill out of knowing that she went commando every single time she went out to fight a villain or save people in need, and no one had a clue. No one until now, that is. Now Izuku knew her secret, and he looked very impressed by it.

"Oh…Shimura-san," Izuku groaned. He was staring at her dripping pussy with awe, and Nana took the chance to admire his own naked body. He was relatively scrawny, especially by the standards of a top hero like her who had to keep her body in peak physical condition in order to be worthy of wielding the power of One For All. But she wasn't concerned about the size of his arms or the definition of his abs. There was only one part of Izuku's body she was concerned with right now, and there was nothing scrawny about that part of him. His cock jutted out big and proud, and seeing it made Nana's mouth water. There it was! There was the thing she wanted and needed, the thing that she hadn't been able to get out of her mind from the moment she swooped in and saved him from the sludge villain for the second time.

"Fuck me, Izuku!" she begged. "Give it to me! I need it! I need it so bad!"

He surprised her by spinning them around so now it was her back hitting the wall, but it was the best kind of surprise. This unassuming-looking young man would've been the last person most people, including her, would have expected to take charge like this with a strong, famous hero like her. She loved seeing this show of confidence from him though, and she happily wrapped her arms and legs around him and allowed him to lift her up off of the ground with two firm handfuls of her toned ass through the tight bodysuit.

There was no bodysuit shielding her front from him though, much to both of their delight. Izuku's hard cock rubbed against her crotch a few times without actually going inside, and she whined in frustration, not sure whether he was nervous and legitimately struggling to slip it in or if he was deliberately teasing her. She was just about to bark at him to get on with it when his hips nudged forward and his cock penetrated her at last.

"OH!" She gasped the second that she felt him go inside of her. Thanks to her busy life as the top ranked hero it had been far too long since she'd been able to have sex; toys and her own fingers had been her only companion for quite some time now. But even the best sex she'd ever had couldn't compare to the feelings of completeness and contentment that shot through her body from that first moment of penetration with Izuku. This was different than any other time and any other man. She didn't know why this was happening or how she had been drawn to him so quickly, but the one thing she knew for certain was that she was made for this, made to be fucked by Izuku Midoriya's cock.

Thanks to the pheromones that was driving both of their actions without their knowledge, he was just as hungry for her as she was for him. He slammed into her desperately, hitting her with thrust after thrust as he held her by her ass and pinned her against the wall. Many women probably would've been uncomfortable like this, getting fucked so hard while their backs were brushing against brick. Even if Nana had been such a woman, even if she hadn't been a fit and tough superhero who dealt with far worse discomfort on a nearly daily basis, she was so aroused that she wouldn't have cared. Her body didn't care what happened to it. As long as she kept getting fucked so well, as long as Midoriya gave her the fucking she so desperately needed, it was worth whatever pain she needed to endure. Nana didn't know where this had come from. Sure, she liked sex, but never in her life had it so utterly consumed her entire being. She was aware of nothing other than the in and out of his cock as he pushed it deep inside of her and then pulled it back out, again and again and again.

He fucked her frantically against the wall, every bit as desperate to fuck her and breed her and make her his as she was to be on the receiving end of all of it. His awakened quirk was behaving exactly as intended, driving both Izuku and his chosen lover into a frenzied sort of single-minded, make that mindless obsession with mating until they physically could not mate any more. Izuku wasn't concerned with trying to pace himself or make this last long; his brain couldn't even comprehend that concept right now. Neither could Nana's, for that matter. She just panted and moaned along with his thrusts as he did his best to fuck her right through the wall.

It was over as suddenly as it had begun. There was no warning from Izuku, not that Nana would have wanted one anyway. He just pounded into her steadily until the internal pressure was released, and he made sure his cock was buried inside of her as he hit the point of release. They moaned together as he filled her with his seed, completing the biological urge that had been overwhelming them both from the moment that she swooped in to save him for a second time and Midoriya's hero worship on the One For All user blossomed into something more. He was no longer a mere fanboy; now he was her man, her lover, and the father of her future children. She hoped that the semen currently being emptied into her pussy took hold so she could make a child with him as soon as possible.

The pheromones weren't going to take any chances though. They both had a job to do, and they wouldn't be allowed to rest until it was carried out. Nana didn't even allow Izuku to pull his cock out of her, if the thought had ever crossed his mind. She propelled her weight forward, sending him tumbling down onto his back on the ground. He let out a grunt when his body hit the ground, but Nana wasn't concerned for his well-being at the moment. Her body was driven only by the pressing need to procreate with this young man she'd known for only a matter of hours, and everything she did was in service of that goal that currently defined her very being.

Izuku's back had barely even touched the ground before she sat up and started riding his cock. Nana squealed and moaned as she took her new lover for a ride, putting her hands on his chest for balance and launching herself up and down on his dick. Her eyes widened in surprise when his hands came up to her chest and followed her lead in ripping another hole in her bodysuit, right above her breasts. She was stunned by his show of force, but not exactly bothered; she'd already ruined this bodysuit anyway. It didn't seem like he was unhappy to have her on top of him for now though, which had been her real concern. Her most recent lover before this had always wanted to be on top. He had been intimidated by her strength and always fucked her like he had to prove his own manliness, and frankly it had made sex a lot less enjoyable.

Because of that it had been a very long time since she'd had the chance to get on top of a guy and have complete control of her body during sex, and only now did she realize how much she'd missed it. She loved being able to ride a guy with all the strength she had. Well, not all the strength she had; that would shatter the bones of most men! But she was definitely enjoying this opportunity to control the flow of sex and show her new man just what she could do. Her powerful hips crashed down onto him repeatedly, and her sizeable breasts bounced every time she dropped down and took his cock inside of her tight pussy, the same pussy he'd just cum inside of. That was what this was all about, and every time she bounced on his cock was done with that ultimate goal in mind. She would keep riding Izuku like a prize stallion until he gave her more of his semen. And if there was any more left in his balls after that, they'd do it all over again, and again and again and again, as many times as it took, until he had no more sperm left to give to her.

Nana had always been someone who was never content to fall into boring routines and keep repeating the same things, and that applied in her sex life every bit as much as her day to day activity. Bouncing up and down on his cock was fun, but her body wanted to switch it up.

Her lover must have had the same inclination, because he unexpectedly sat up and repositioned them so he was on his knees and her legs were bent on the sides, with her feet on the ground next to his knees. He hugged her body to him and together they began to rock back and forth on the ground, sliding his cock around in her pussy. This position gave them the chance to kiss each other, and they happily engaged in a playful wrestling match with their tongues while their hands also roamed each other's bodies. He grabbed her ass, and she rubbed at his bare upper arms and played with his fluffy green hair. It was a surprising level of intimacy and affection for a couple who had only just met and were having sex because his quirk had compelled them to do so, but it was a sign of things to come. Right now their relationship consisted solely of fucking, of fulfilling their bodies' needs and breeding, but eventually it was going to evolve into something on a deeper level.

Love would come later though. Now was a time for breeding, and Nana and Izuku moved their bodies to reach that endpoint. She pulled her head back to look directly into his green eyes while she urged him to give her what they had both somehow known they needed.

"Cum in me, Izuku!" she begged. "Give it to me! Give me your semen! Do it! Knock me up, please, knock me up! Do it! Cum in me, do it, do it!"

"Shi-Shimura-san…" he groaned.

"Nana! Call me Nana!" she shouted. No need for him to be so formal with her. He was about to cum inside of her and hopefully knock her up; it'd be strange for the father of her future child to not refer to her by her given name.

"N-Nana!" He closed his eyes, held her body tighter against him and moaned as he hit his peak for the second time. It felt like he was giving her a load every bit as big as the first one, which excited her to no end. The more semen he could shoot inside of her, the better.

"That's it," she cooed. "That's it, Izuku. Fill me up. Give me everything you've got."

Their bodies remained still while they waited for his orgasm to trickle down. They were both panting by the time it was done and she pulled herself off of his lap and got back to her feet. She helped him back up as well, and they looked at each other and smiled. Neither of them could have ever imagined the turn their days would take, but she wouldn't trade it for anything, and she could look into his eyes and tell that he felt the same way. It was unexpected, but it was perfect. She'd always known she wanted to be a mother some day, and it was comforting to know that she'd found the young man who was going to make that happen. He might have even made it happen right now. And if he hadn't, well…

"Do you live around here?" she asked, looking at him as he began to gather his clothes.

"Uh, yeah," he said. "I live with my mom." He looked away, blushing. "You know, just for now." She wasn't bothered at all; he was still a young man, after all. There was one potential complication that this did present though.

"Is she home right now?"

"No." Izuku shook his head. "She's out of town right now, visiting an old friend. She'll be gone all weekend." Nana smiled widely when she heard that. This was perfect!

"You know what that means, don't you?" she asked. He shook his head. "We can spend the rest of the weekend fucking in every square inch of your place and making absolutely sure that you knock me up."

"Y-yes!" he said, standing ramrod straight. He hurried to pull his clothes on, and she bent down to gather her own things. It was only then that she realized she'd made her journey out of this back alley quite a bit harder on herself. There wasn't really anything she could do to hide the giant rips in the crotch and chest of her bodysuit.

"Well, it's a good thing I can jump really high," she muttered to herself. She put the rest of her clothing back on, picked Izuku up in her arms and followed his directions that led them back to his apartment, minimizing her time on the ground and avoiding any heavily populated sections. Maybe she could have come up with a less risky solution, but she was too horny to waste too much time on that. She needed to go get knocked up, and besides, what was life without a little risk every now and then?

--

"Hah….hah…hah…"

Nana flopped down to the side and let her head rest on Izuku's chest. He'd just come inside of her yet again. What had that been, the fifth time today alone? Maybe even the sixth? It was hard to keep her head straight after an entire weekend spent fucking Izuku across every inch of the apartment he shared with his mother. They'd had all sorts of fun in exploring the various surfaces. Izuku had really loved having sex in the tub with her, but her personal favorite had been when he bent her over the kitchen table and fucked her from behind.

His mom was due to return from her trip today though, so they were restricting their activity to his bedroom for now. He was going to introduce her to his mother when she got home (not that his mother didn't know who the #1 ranked hero was, of course) and tell her they were together. The specifics of the relationship were better kept private though. There was no need for his mother to know that she'd dragged her son into a back alley and torn her bodysuit apart because she had been so desperate to have him fuck her and hopefully impregnate her. #1 hero or not, she feared she might make an enemy out of Izuku's mother if she knew just how brazen and risky and sudden all of this had been.

How they'd come together was impossible to explain. She loved sex, but dragging off some guy she'd only just met, ripping her costume apart and fucking him in public so he could get her pregnant? That wasn't Nana Shimura, or at least it wasn't who she'd been before this weekend. Truthfully she didn't fully understand it herself, but she wasn't bothered by that. She couldn't explain it, and she didn't need to. She just knew that her life wouldn't be complete until she was carrying Izuku's child, and she had a feeling that this pull she felt towards him wouldn't fade even after that.

"Izuku? I'm home!" The door to the apartment closed, and Nana felt her hands shaking as she hurried to put her clothes back on. She couldn't remember the last time she'd felt this nervous. It had to have been before she mastered One For All, surely? She wasn't accustomed to this kind of anxiety anymore; she was a confident hero and woman. That just spoke to how important Izuku had become to her in such a short time.

"Hi mom!" Izuku said. "I've got someone I want you to meet."

"…Is this someone also the owner of the bra that's sitting on our kitchen table?"

Nana swore she could feel her heart stop as her words made it through the closed bedroom door and settled in. How had she forgotten her bra?!

"Well, I guess the cat's kind of out of the bag, huh?" Izuku whispered, grinning at her sheepishly. "Ready to get this over with?"

"Are you sure I can't just go fight the sludge villain again?" she whined. "Heck, I'd even take another round with All For One over this."

Nana Shimura would fight villains and throw herself into danger with a smile on her face, but meeting Izuku Midoriya's mom was a battle that One For All could not help her with.

"She's not that bad!" Izuku said, laughing. "Besides, she'll probably love you as soon as you tell her you want to give her grandchildren!" Unbeknownst to him, his mother had gotten closer to his door while she waited for a response.

"…Izuku? Did you just say grandchildren?"

(There's still part 2)