[Growth, Weight Gain]
Izuku Midoriya was a boy with dreams. Dreams of becoming a Pro Hero. Dreams of protecting the ones that he loved. Dreams of protecting the world from evil. Dreams that were unceremoniously crushed as he heard he didn’t have a quirk.
At least, that’s what he thought after that fateful meeting with the doctor. But as he soon discovered, he did have a quirk. It was just one that didn’t work very well, or would help him do what he wanted to do. Because while quirks like pyrokinesis, or his buddy Kacchan’s ability to make his sweat explode…
His relied on the presence of a female and for his emotions to be irregular. If he then touched them, and they had sufficiently caused his emotions to waver… They’d grow. They’d grow and grow, until they couldn’t grow anymore. It was something that he discovered one day when his mom tried to comfort him, and ever since that day he tried his very best to try and avoid using it. Because not only was the sight of his mom expanding in all the wrong ways a terrible thing for a boy to see…
A boy like him couldn’t stop himself from popping a boner when faced with such a situation. It was enough to make him squirm and shiver just thinking about it. And unfortunately for him, it was something he thought about quite a lot.
But… There was a chance for him to fulfill his dreams. When he had a chance encounter with the man that he idolized. And a chance to save the boy that he was once deep friends with, before things took a turn for the worse.
He risked his life to save Kacchan. He distracted a villain, and gave the man who he idolized the chance to deal with him. Even a boy with a bad quirk like him could save people. It brought a smile to his face, even if the other Pro Heroes told him off for risking his life so recklessly. Just the thought of helping his friend was enough to set him on the right path…
“Oi! Kid!”
Unfortunately, as he was making his way home from school, it seemed like he had attracted the attention of a certain woman who had a bone to pick with him. Not because he was anything special, but precisely for that lack of special flair.
“Y-Yes?” Izuku asked as he turned around to face the woman calling out to him, gulping a little as he almost immediately noticed the sheer eroticism of her costume. Why did female heroes have to be wearing such tight clothing..?
Not to mention, it just had to be Yu Takeyama. Better known as Mt. Lady. The woman with the ability to grow on command, something she put to good use dealing with the toughest villains on the block. After all, they couldn’t exactly deal with somebody much bigger than them, even if they had lots of abilities on hand.
“You, kid, you’re the absolute worst.” Mt. Lady said as she prodded her finger straight up against his chest, her cheeks puffed. “Why’d you have to go and steal the glory? I was going to turn all huge and then step on that slimy bastard, just so I could get all the fame! I even prepared the perfect tattoo just in case somebody wanted to snap a great picture!”
The shamelessness of the heroine knew no bounds. Especially as she turned around and showed off her ass to the boy, revealing a bright ‘Mt. Yours’ on her asscheek. “Come on, imagine how all the boys would go nuts over that? They’d try anything to get a piece of this, just to try and get with me!”
Izuku narrowed his eyes a little. While he was an enormous nerd in regards to heroes, he admitted that he didn’t exactly find interest in her antics. Was it the costume? Was it her nonsensical approach to heroism? Or was it simply because she was too shameless? He couldn’t tell. All that he knew was that he didn’t like her that much. So not long after seeing that tattoo, he tried to walk away. Just so she could leave him alone…
“Hey! Don’t turn you back on adults when they’re talking!” Mt. Lady cried out as she grabbed the boy by the shoulders, forcing him to turn around and look at her again, her tits very nearly smashing their way into his face with how violent she was being. “Aren’t you going to apologize for what you did? Stealing the glory of a hero?”
The boy took a deep breath as he looked into her eyes. He really didn’t like the way she looked at him. It was exploitative. It was mean. She just wanted her paycheck and her fame. He wanted much more than that… Why couldn’t people just be good people? Instead, she had to be…
“Please leave me alone.” Izuku said as he tried to pull away from her. “I didn’t do anything wrong.” He continued, struggling. All while his body started to tremble. He knew what was coming. He didn’t want to do it, but she deserved it. If he did it, she’d probably stop bothering him over it… But then she’d reveal his quirk to the world, and he didn’t want that..! He wanted to stay ‘quirkless’, so he could get better like that..!
Mt. Lady narrowed her eyes as she grabbed him by the cheeks, tugging and yanking on them. “You little brat! You don’t get to say that to a hero!” She was well and truly angry at him. Her vanity had consumed her, making her little better than a villain at this point. “I’ll have you know, if I don’t end up in the spotlight, people are just going to pass me up for the next hottie they see! And that’s not fair! I should be the only one they look at!”
He didn’t want to do this. But he had to. Otherwise, she’d just keep going and going. And he couldn’t call on anybody, she’d probably try to paint him as the one that assaulted her instead of the other way around. This was his only chance to turn things around..!
Izuku grabbed ahold of her asscheeks, squeezing his strong hands into them and forcing the older woman to let out a big, powerful moan thanks to her sensitive spot being manhandled like that…
“Y-You little brat! I knew you were the worst, you’re probably a villain trying to wipe away his reputation by acting like a good boy!” Mt. Lady cried out as she struggled to get free. She was just the kind of woman that’d try to blame a boy like him for his failures, when she was the one who had instigated all of it. She wanted nothing more than to see him apologize…
Which was why she was shocked to feel something pulsating through her. It was a swelling sensation that was sweeping over her, causing her to gasp and pant. She didn’t understand what exactly was happening, but she couldn’t deny that it felt good…
“You made me do this…” Izuku muttered as he looked up at her, a disappointed look in his eyes. “All because you had to be a hero that didn’t know when to stop..!” He cried out, sinking his hands even further into that ass.
It brought the woman’s attention to her ass, as she looked over her shoulder to stare straight down at her pillows. They had grown. Exponentially so. In fact, it was a wonder her suit hadn’t torn right then and there, what with how much she had already grown. It was like both of her asscheeks were the size of a basket ball, struggling within that thin fabric.
“T-That’s a quirk! You’re definitely a villain!” Mt. Lady cried out as she tried to use her own power right then and there. If she could just grow bigger than him, she could not only turn him in for being a perverted little brat, but she could the broadcasters to send out a message with her ass just like she wanted.
Unfortunately, she didn’t get that far. As soon as she tried growing, he noticed and squeezed his hands deeper into her ass, causing that pulsating sensation to reverberate through her even more. “I’m not a villain! You’re the one acting like one with that attitude, Miss Yu!”
The heroine let out another gasp as her ass kept on pulsating, tingling with every second that passed. She could feel that growth spreading through her, as her cheeks flushed a bright red. “Y-You don’t get to use my real name, kid! You’re doing worse than I ever could!”
“I’m just defending myself from a woman that wants to bully me into silence!” Izuku shouted back as he let go of her ass, quickly running around her as she tried to stop her body from sending so much pleasure through her.
Mt. Lady tried her best, but as soon as she felt a powerful slap ring through her body, she was forced to let out a massive cry of pleasure, as those two massive mounds wobbled back and forth from the sheer intensity of the slap. “H-How strong are you?!”
“I’m not strong at all, not like a real Hero. You’re just like this because you’re trying to be greedy!” The boy cried out as he wound up another slap, watching that pudding-like pair of cheeks wobble all over before he slapped them again, causing them to bounce and wobble even harder.
The heroine fell onto the ground after that second slap as she tried to fig her fingers into the pavement. She was trying her best to suppress the moans, wondering how and why it felt so good to have her body wobbling around like that. How was it possible that a boyish villain like him could do something like this to her? It just didn’t make any sense! And worst of all was the fact it felt good to be spanked. N-Not that she had tried it before and definitely didn’t plan on trying it out in controlled environments…
“O-Okay, look… If you just promise to give me the glory you took from me, I’ll say sorry for trying to do bad things to you in return. Okay? That’s fair, right?” Mt. Lady said as she slowly turned her head towards him, smiling the best she could.
Despite the fact that her ass was now twice the size of her head, despite the fact that she knew that the boy could counteract her quirk if he activated his earlier than hers, and despite the fact that she knew he wasn’t the type to let things… She still tried to make that deal.
All it earned her was another spank on the ass, the wobble from her cheeks causing them to grow even further as they struggled to stay within the suit. It was outright tearing at this point, something that her quirk normally couldn’t cause it to do.
“H-Hey! I promised that I’d say sorry! Isn’t that good enough!?” Mt. Lady cried out as she let out another moan, trying not to show off just how melted her expression had become. To have a boy, a villain for all she knew, treat her like just some sort of sexual object… It excited her. So much so that she almost started wriggling her hips, inviting him to punish her more.
Izuku narrowed his eyes. She really was the worst hero of them all. And thus his anger and his contempt for her grew, in tune with the growth of her posterior. It was an ugly sight, but it was what he had expected to see once he used his powers.
But it wasn’t enough. He needed to make sure she understood just how badly she had affected him, as he climbed atop of her and started squeezing his hands into her stomach.
“H-Hey! Hands off the goods! You really want to be known as a villain that molests heroes, kid!? You’d better stop!” Her ass was one thing, but Mt. Lady was sensitive about her stomach. If people knew about how her tummy could grow on its own if she wasn’t careful, then she’d be the laughing stock of the entire Pro Hero scene. And she was already causing problems with her glory hounding…
Izuku didn’t listen to her. In fact, her trying to stop him was enough to make him more frustrated. And that frustrating flowed through him and into his hands, before pouring into the woman as it pulsated and made her body quiver and shiver. The more she tried to stop him with bad words, the more he’d punish her..!
As the powers of his quirk started flowing into her stomach, it slowly but surely started to push out against her suit. The very same suit that was doing its best not to tear in the back, was now dealing with a brand new sort of pressure in the front.
Mt. Lady could feel her cheeks flushing bright red as she looked at herself. She could feel the fat flowing into her belly, as her own anger rose to new heights. “Listen here! If you keep doing this, I’ll.. I’ll!” She cried out, her frustration combined with the pleasure to make it harder and harder for her to think straight. All she knew was that she didn’t like this one bit.
*SPANK*
“And stop that! It’s the worst!” The heroine cried out as that massive mound she called an ass stretched and bounced from side to side after that blow, leaving the tears in her suit growing ever slightly bigger the longer it went on for.
Izuku didn’t listen. He squeezed into her growing belly and into her ass with every passing moment. He didn't admit it, but he kinda enjoyed seeing her fall victim to his quirk. He didn’t consider this part of becoming a villain or anything, but he just couldn’t deny the delight he got from all of this…
Her belly, which had only just started taking on the size of a football, was now growing to twice that size, and the softness that came with it was astounding. It was honestly surprising that anybody could be this delightfully soft. Especially a heroine who was known for growing in more straight forward ways…
“Sstttooooppp…” Mt. Lady cried out, her cheeks and face now completely red. The pleasure was overwhelming. The pleasure was intense. She could feel her thighs getting slickened thanks to the juices running down her legs. She could feel every single breath that left her lips driving her further up the wall. She couldn’t take it. If he didn’t stop, she’d probably cum before anything else…
Izuku took a deep breath as he looked at her. An ass that was still struggling to not tear the suit completely apart, and a stomach that looked a little firm thanks to the very same suit. If he didn’t know any better, he’d think she was expecting a couple of triplets at this point…
But he still wasn’t done. Despite everything she had gone through, he was now too horny to stop. And when he was horny, he just couldn’t control himself, as he started slipping his pants off.
Mt. Lady looked over her shoulder and saw the leery look on the green-haired boy’s face, gasping as he pressed his cock up against her nearly torn suit. “L-Look, we can talk about this. We can just go our separate ways, and we’ll act like this never happened. That’s fine, right? You don’t have to do this!” She cried out, nearly begging. If she got hit like this, if he pumped that thick thing into her, then..!
He didn’t listen. Izuku was too far gone to listen to a woman like her. Everything she had told him had done little to make him think of her as a good person. And that meant that he was free to go as wild as he wanted.
The boy slammed his hips straight forward, making direct contact with hers as his cock slipped into her exposed pussy, their mutual cries filling the street as his quirk continued to work its magic on her.
Now that he was utterly consumed by his lust, it made sense that she’d grow even bigger to make the experience as plush as possible. He didn’t want to get hurt by fucking her, after all. And when she could still grow so much more, what choice did she have in the matter?
Mt. Lady let out moan after moan as she felt the pulses of pleasure pour over her. Not just from the quirk, but the shaft inside her was also giving her problems. It did feel really good to be rammed into like this. It very nearly made her eyes roll into the back of her head from how good it felt.
And that wasn’t even taking her growing body into the equation. Those mounds, which were almost as big as the boy’s torso at this point, were growing even bigger. If they grew any bigger, they could probably be used as a two-seat couch, leaving her unable to sit down in any furniture ever again. A proper punishment, considering her lazy approach to gaining fame…
Not to mention her belly. While her ass had grown so thick due to how much attention it had earned, her belly was growing at a rate much faster than it. From looking pregnant with several children, it grew wider and softer, losing its firmness in the process.
With every thrust, the rude Heroine became more and more aware of how her ass and her belly were becoming one in terms of softness. Namely by her entire lower body growing in tandem, resulting in everything below her tits becoming one solid lump of pure fat, jiggling with every breath she drew. It was horribly embarrassing, and she still wasn’t done growing.
The feeling of being shoved into like this was humiliatingly good. It felt really good to be fucked. She knew that well. It was something she tried on the weekends, but nothing came as close to being as good as this. Was this because she had always been lacking something..?
Mt. Lady didn’t know. All that she knew was that she was growing to love this railing more than she’d care to admit. She just hoped that it’d come to an end before things went off the rails…
Izuku didn’t stop. His hips were like a piston with the off button permanently broken. There was no way for his hips to stop. He was too busy slamming his hips straight into the woman in front of him, panting and drooling as his vision grew foggier with every passing moment…
Why was he fucking her? He didn’t know. Why did it feel good? Probably because she was tightening around him with thrust. Was she growing? Yep, and in tune with his thrusts. That part was probably what turned him on the most, the way that her hips grew softer and bigger, cushioning his rapid thrusting more and more.
The boy’s quirk was basically going haywire at this point. He couldn’t stop her from growing, and he couldn’t stop fucking her which meant that he wouldn’t stop making her grow and so on and so forth. It was an endless cycle that they were both stuck in, and they both loved it more than they’d want to or could admit…
As they both climbed towards their climax, Mt. Lady continued to climb towards her resting point. She could only grow so much, before her body would start throwing a fit. And sure, she could use her power to grow even further, but that would require her mind to be conscious and aware enough to focus on it.
Her body was like one massive pear at this point. Her legs were utterly ineffective. They could waddle around if she tried to stand up, but that didn’t guarantee anything. She’d have to roll around if she wanted to get anywhere at this point, and with how sensitive her stomach had gotten, there was a good chance that she’d actually do it just so she’d feel the delight of teasing herself…
Izuku’s eyes rolled into the back of his head as he spanked both of her cheeks one more time, shoving his hips as far into her as they could possibly go, the softness of her body serving to cushion him at the same time while his cock slammed against her cervix, trying to break all the way into her womb…
Mt. Lady let out a delightful and almost orgasmic moan as she felt him knocking on the door to her womb, her cheeks flushing bright red as she tried not to climax right then and there, but the way that he started to throb inside her made it difficult to. Her folds clenched down on his rod as her pear-like body trembled all over, her fat wobbling from the orgasm that washed over her.
The boy’s own orgasm came shortly after that as he slammed his hips inward one more time after drawing his hips back, slamming through her cervix and letting it get all the way inside. Once it was nestled with the womb’s entrance serving as a ring around the tip of his cock, he reared his head back and let out a powerful shout, pouring as much of his cum into her as he possibly could. Filling her. Bloating her. Making her stomach just as full on the inside as it was on the outside…
It only took a single Quirk to throw everything out of whack. A quirk that relied on its owner’s emotional state to cause havoc. The result was the woman with a full womb, and the side effect was the immense guilt that immediately filled Izuku as he pulled out and realized what he had done. And instead of taking responsibility for what he had done, instead of doing anything to try and ease up her current state…
He ran. And hoped that all of this was just some sort of abstract nightmare that he had…
---
Izuku didn’t know what to think of what he did the night before. He woke up the next day thinking that it had been just one big crazy dream, but he knew that it couldn’t have been due to how absolutely wet his cock was.
He went through his day, hoping that everything was just going to turn out normal. He hoped that it would just be alright. He hoped that it wouldn’t be an issue. But as he saw the reports on the news, as he saw the images that were circulating around on the net, he started getting worried.
There she was. Mt. Lady. In her ruined suit, looking like some overly plump pear. And despite the humiliation she had suffered, she relished in the attention. She knew what she could do with all of this, even if they were making fun of her.
But for some reason, the text that she had showed him wasn’t there. There was no ‘Mt. Yours’ on her massive behind. Just a few slap marks from where he had spanked her.
As he went through the day, hoping that everything would turn out alright, he suddenly got a text on his phone… And he knew what it meant, as soon as he saw a familiar ass cheek.
Izuku headed straight for the address included in the message, showing up at an apartment that looked like it couldn’t house a pear like her, but as soon as the door opened…
He saw the apologetic look on her face, and the trail drooling down her thigh. She didn’t need to say a thing for him to know what she wanted.
Thus, the ‘quirkless’ boy ended up turning an ‘enemy’ into a ‘friend’... And in the process, start a worrying relationship that would help temper his quirk…
If they could stop making her grow whenever they started getting rough with one another.