Chapter Text
Katsumi had known about her romantic feelings for Deku for years. The knowledge that at some point in the future he was going to be her husband had pretty much been secured in her mind for nearly a decade now. All those thoughts, feelings, occasional dreams, and random desires were placed firmly on the back burner, sure, but sometimes she’d smell something good coming from that direction and go check on its development, and they were progressing steadily.
She could honestly say that she loved Deku without even blinking. Sure, in order to get that out of her someone would likely have that dork at gunpoint and then immediately after that confession she would kill the person that forced it out of her. Purely on principle. The only time she ever planned on telling anyone that she loved him, would be to Izuku himself when they first started their relationship.
After she became a hero.
Ideally.
Even if things hadn’t actually changed that much between them, she was still rather practical about her future with Izuku. They’d get together eventually, probably when they were in their twenties, get married at about age twenty-five, talk about having kids, she’d agree at some point when it wouldn’t affect her hero career too much, and Izuku would probably pull his hair out trying to put up with her being grumpy after patrol, their troublemaking daughter, and his career as a support tech.
But he’d stop pulling it when she reminded him oh so lovingly that she loved running her fingers through his hair. Then they’d fall asleep with Izuku being the little spoon because he was the same scrawny dweeb he’s always been.
Katsumi smiled as she walked through the halls of the support building, a bit of a hop in her step as she almost hummed to herself. Sometimes those feelings she had for Deku would boil out from the pot she kept them in and would leak out, now was one of those times she was so happy to be able to see him again that she was nearly skipping.
Nearly.
The only time she would be caught skipping would be over the grave of some bastard that really pissed her off.
Or maybe exactly two skips in a hallway when no one was looking the day Deku proposed to her or something equally as sappy.
“Still, to think that damn nerd would be making a name for himself already.” Katsumi smiled as she remembered the day that Deku’s goal changed. It was shortly after he found out he was quirkless, but instead of crying about it like she thought he would, he instead just shrugged and threw himself into using his giant nerd brain to become a support member. It was right about when he showed her his first sketch of her potential hero costume that Katsumi first realized that she was going to marry Izuku.
Through elementary school and well into middle school, Izuku had been her private support guru. She still had a few of his early gadgets, and his training and technique ideas put her a cut above the rest of her class. So it wasn’t any surprise when he got into U.A. support course he fuckin’ killed it.
Hell, she was wearing a hoodie he designed that was going to eventually be part of her merchandise once she became a real pro. The version she was wearing was sleeveless, and just short enough to show off some of her stomach, and looked fucking badass with her usual green, black, and red colors all in a pattern that almost looked like her suit. It was her favorite sweater.
Mostly because Izuku made it, but nobody else needed to know that.
She had a long sleeved version for the winter, but that didn’t show off nearly as much. And she wanted to tease Izuku into looking at her.
Just enough to confirm that he was still at least partially gaga after her.
“Oi Deku!” Katsumi opened the door the same way she always did. With her foot, and walked in like she owned the place. Which considering how Deku pretty much had the keys to the place she did! “I need-”
The words were murdered in cold blood as chaos erupted in her mind.
Deku. That scrawny. Weak. Nerdy. Noodle boy. That she was hopelessly in love with was currently wearing a tank top. Only he wasn’t scrawny. Or weak. And there was no way that those guns could ever be considered a noodle. Instead. The Deku she had known for years was a fucking hunk.
Like.
Holy shit.
Just looking at him made it feel like her sexuality had finally leapt out of the closet and started to beat her to death with pure physical attraction to Izuku. Sure, she had always thought that he was cute, and sometimes handsome, but watching his muscles flex as he gritted his teeth, turning a wrench the size of a baseball bat, made her realize that she had never known what raw attraction was.
But this didn’t make sense.
Zero sense.
It was completely nonsensical.
When the hell did Deku become so fucking hot?
And why the hell wasn’t he picking her up and fucking her against the damn wall already?
With a grunt that made every erogenous zone on her body tingle, Izuku pulled that wrench down, turning it ever so slowly as he looked at the colossal piece of equipment he was working on.
“Kacchan.” At least he still sounded like Deku. Only. Fucking hotter. He smiled at her and Katsumi could swear that she heard her ovaries explode and shit out a dozen extra eggs each. Her face felt hot. And it also felt like it was stuck in some kind of a dopey smile or something. “What brings you here?”
Deku stepped down to ground level and walked towards her, carrying that wrench over his shoulder like a fucking caveman about to drag her back to his furs for a night of rough sex that would leave her unable to walk. As if that wasn’t enough, he grabbed at his tank top and pulled it up to wipe the sweat from his brow.
This simple act did several things. It let Katsumi know that Deku had abs that she wanted to eat dinner off of. There was a hint, just the slightest, lewdest hint, of Izuku’s underwear. And then there was that small patch of green hair on Izuku’s stomach that was practically pointing downward.
He stopped in front of her and Katsumi felt like Deku had grown a foot.
“Uhh, Kacchan?”
Control! She needed to be in control.
“When the fuck did you get so tall?” She blurted out, glaring at him, defaulting to pure simple anger to try and cover up her, she didn’t really want to call them emotions because right now, her love for Izuku was still in the pot, there was just a giant monster of pure horniness trying to open it up. But yeah, anger was easy for her. And she was going to use it.
Izuku scratched the back of his head, running his hand through his hair oh so casually. She wanted to do that. While he kissed and fucked the shit out of her. Dammit! Why the hell was she so horny? “Uhh, what do you mean? I’ve been 6’1” for a while now. I mean, I might have grown a bit more, I haven’t checked recently.”
Lying son of a bitch!
“Well, whatever, I’m here.” Fuck why the fuck was she here? It was something about her gear wasn’t it? Well not really, she actually just wanted to tease Izuku for a bit to scratch that itch, but if she did that she’d probably end completely pinning for him. How to recover? Think Katsumi think! Oh. Wait! She knew! “I’m here to talk to you about some improvements to my hero costume. The Sports Festival is over so internships are going to start back up again. So I want to make sure I’m extra flashy.”
Izuku’s smile grew and he walked over to the area that held so many of his designs, several different sketches of her potential hero costumes were among the most prominent. It was impossible not to notice that when Izuku drew her the detail was just that much finer. “That sounds great! I don’t have any important projects so I can get started right away, do you have any requests or modifications I should know about?
“Yeah, the chest plate has been getting a bit tight recently so would you mind loosening it up a bit? During a long fight it gets a bit hard to breathe.” Katsumi rolled her shoulders trying not to look at Izuku, instead focusing on the wide variety of gear and gizmos that head had constructed. Some of them she wasn’t sure she could beat without using some of Izuku’s own gadgets in return.
Like his fucking glue gun. How the fuck was something that was shock resistant, heat resistant, and so fucking sticky?
“Chest plate is tight.” Izuku jotted the words down in his chicken scratch and made a mark next to it. He opened up the drawer, and pulled out a measuring tape. “Do you mind if I take a measurement real quick? I know you don’t like it when things move around either so this will help me make certain that everything is the right size.”
“Huh? Oh. Sure.” By the time she took her hoodie off her brain finally registered what was about to happen. He was going to measure her chest. As in her breasts. Her breasts that were currently bound in a double sports bra combo to keep her from bouncing everywhere during workout. “Umm, is the bra going to be in the way?”
The last time she had gotten her measurements for her hero costume had been nearly a year ago
“Nope!” Izuku flexed and showed off his measuring tape, a trail of blue lights ran up and down it. “This is a baby I made for the support course a while ago when Mei tried to force a 1st year to strip so she could measure them.”
While Katsumi could claim at least a fourth of Izuku’s gizmos as inspired by her, Mei took up a solid half.
Mostly to avoid a lawsuit.
For about a week, Katsumi was at least somewhat jealous of the girl. But then she realized that Mei couldn’t be considered human and that Izuku treated her like some kind of hamster.
“It can get an exact reading through clothing, and I even-”
“Izuku, I swear to fuck if you say you made it able to detect bust size through a god damn sports bra, I’m going to blow you the fuck up.”
Izuku just laughed. “You might actually be right, umm, do you want me to go get Mei, or actually any other girl?”
“No.” Damn, she said that way too fast. She glanced around the shop finding it devoid of humanoid life. Well besides Mei who was giggling in the corner, but again, she wasn’t exactly human. “I trust you. Just don’t look while I take this thing off. Your thing will work through my shirt right?”
“Yep!” Izuku nodded and turned away from her. Fuck. She could see his goddamn back muscles with that tank top. “Let me know when you’re done.”
This was easily the most embarrassing thing she had ever done. But at the same time. She was really turned on right now. Was she actually doing this because of how aroused she was? Maybe? Hard to tell. Once her bra was off and her shirt back on, Katsumi tried to smooth her shirt out, the outline of her breasts was so obvious.
Okay. She could do this. She was just having Deku measure her for her hero costume. That was all. She chose to have this happen. It wasn’t like he actually suggested it. This was on her. But she had no idea if that made it better or worse. Hopefully Deku enjoyed this.
“Okay.” She kept her back to him if only to hide her blush. And lip bites. “Hurry up and take your damn measurements.”
“R-right!” Izuku stepped behind her, she could feel him looming over her. When he measured her waist it felt like he was hugging her from behind, her neck burning in anticipation of some kind of affection like she had seen in those shitty girls night movies her classmates occasionally forced on her. His hands moved deftly, moving up from her waist and instead wrapping around her armpit for a random ass measurement, she followed his commands moving her arm around in a wide circle as he kept notes, they repeated the same for her other arm. He measured above her breasts, arms out like a T, then again with her arms at her sides. A dozen measurements all taken by her crush painted a perfectly detailed and numerical image of her body. Then after what felt like an hour of procrastination Izuku finally managed to gather the courage to measure her breasts.
It felt like he was groping her. Greedily kneading her breasts as she was inches away from moaning his name during a passion filled session of love making. But it only lasted a mere moment.
“You’re a 32E.” Izuku muttered, finally taking a step back away from her.
Well shit. The bastard knew her bra size. Also, that was her mother’s size. So, it made sense that they’d be about the same size. But hopefully she was done growing! Big tits were useless outside of getting attention. And she already had Deku’s attention.
“Alright.” Katsumi threw on her hoodie and pocketed her bra, her face still burning from the interaction. “So, are we good?”
“Uhh, yeah, unless you need anything else.” She needed him to start kissing her and actually grabbing her breasts with those giant meaty hands of his. “For your costume.”
“Uhh, no, I think I’m good for now. I’ll see you later, Deku.”
“Right, later Kacchan.”
Katsumi took a long cold shower.
Followed by her trying to find out when exactly Deku became a hunk and a half by looking through all of the photos she had of him. The answer was, a while. Sure the growth had been gradual but she should have noticed sooner that he wasn’t scrawny anymore! Certainly before. But, now he looked like he was ready to throw her against the wall and fuck the shit out of her.
The growth had been slow. Steady. And barely noticeable day by day.
Katsumi took another long cold shower.
When Froglegs pointed it out, Katsumi just said she was training her quirk a bit.
It didn’t matter if those extras believed her or not.