Thread by @lemonaestheticc

(comm for @/MILFC0RE, cw: fem!bkdk)
Katsuki's never looked twice at anyone, romantically or sexually, and she doesn't intend to. It's a /distraction/ - all her friends drool over people with curvy figures and bright smiles, and Katsuki doesn't get it.
Until Izuku hits puberty. +

Izuku's always been small, unassuming, and a little plain. She's heard Kirishima call Izuku /cute/, something the others had agreed with immediately, but no one's ever thought of Izuku as /sexy/, as far as she knows. It would be weird, she thinks, for people to find Izuku sexy. +

Katsuki's known her since they were toddlers, and while Katsuki can admit that she's not /ugly/, she's never going to think of Izuku as sexy, and she doesn't think her friends will either.
Until one day, they're sitting at lunch, and Kaminari says: "Has anyone noticed how sexy +

Midoriya's become?"
"/Bro/, you can't just say things like that," Kirishima responds, nudging his shoulder.
"You know what," Sero says once he finishes his mouthful, "Kaminari's actually right. Like, I don't think of her like that because she's our friend, she's /Midoriya/, but +

objectively, she's pretty attractive."
"Well... yes, she is," Kirishima sighs. "I guess it's just puberty, but I've never really thought about it either. What do you think, Bakubro?"
Katsuki has stopped eating mid-bite, staring at them all incredulously.
"Deku? /Sexy? You've got+

to be kidding me," she says derisively, resuming her chewing. Why the hell are they calling her sexy, of all people!? She's just Deku. That's all there is to it. Puberty or not, it's not like she's /changed/.
Well, not as far as Katsuki's seen, but then again, she doesn't really+

make a habit of looking at Deku's body. That would be... wrong, right?
"Oh c'mon, dude, don't be like that," Kaminari whines. "You're sexy too, okay? It's not a competition!"
"What the hell did you call me!?" Katsuki yells, lunging across the table. Sero holds her back and +

wrestles her back into her seat without much success until she gives up and flops back down.
"You don't think you're sexy?" Kaminari frowns, ever the little shit.
"I don't think I'm sexy, I /know/ I'm sexy," Katsuki retorts, "but you don't get to say that, you dumbass."
Katsuki +

knows without a doubt that she's attractive. She did actually doubt it at one point, when boys would cower before her and she would never get chocolates for Valentine's, but she's grown to realise that intimidation and attraction can go hand in hand, and when she looks in the +

mirror, she can tell that she has the stereotypical features. Okay, well, her ass isn't /that/ great, but her boobs make up for it more than enough - she's a size bigger than Momo, something she's both proud of and resents. Yeah, she likes being the best, but is the back pain +

really fucking worth it? Their only use is stress relief, after all, and her tiny waist isn't great for supporting it.
/Anyway/, it's not a competition. She doesn't see it as a competition, at least. She doesn't care if the whole world thinks that Deku is sexier, that's not the +

fucking issue. The /issue/ is that people think she's sexy /at all/. She's Deku! She's built to be cute, not sexy, and Katsuki refuses to accept it.
"Well, then why can't you admit that Midoriya is attractive?" Kirishima asks, tilting his head to the side like a puppy in his +

bewilderment. Katsuki sighs and takes another bite of her food, pouting instead of answering. Kaminari's eyes light up.
"Ohhh, I get it," he says, nodding knowingly. Sero shares Kirishima's confusion for a second before he bursts out laughing.
"Bro, Bakugou's in /denial/!" he +

exclaims gleefully. "Bet you just don't wanna admit that your childhood friend is /hot/."
"Shut up!" Katsuki says, swatting Sero, but the flush on her face has given herself away. Her friends tease her about it throughout lunch, and it only gets worse when Mina comes to sit with+

them, because she's /twice/ as enthusiastic.
"Oh yeah, Izuku's really, really attractive!" Mina nods. "I would definitely spend some quality time with her if I ever got the chance. Sucks that she only has eyes for one person."
Mina looks at Katsuki pointedly, and Katsuki blinks +

back at her. What is she expecting?
"Name one single thing about her that's specifically /sexy/," Katsuki challenges, crossing her arms.
"Her ass," Sero and Kaminari say in unison. Mina snorts, and Kirishima blushes, but neither of them protest it either. Katsuki narrows her +

eyes.
"Riiight," she says in disbelief, standing up and lifting her tray. "Well, you're all free to be delusional, but I'm not gonna fall for this bullshit."
And with that, she stalks off, not letting anyone else get a word in edgeways. Why would she? What's so good about Deku's+

ass anyway?
It's a question that stays in Katsuki's mind as she walks back to class. When she slides the door open, Deku's already present, sitting on her desk and chatting to Uraraka.
"Hi Kacchan!" Deku says brightly, her cheeks dimpling when she smiles. /Cute/, but not sexy. +

Katsuki can't help it, though; her eyes flick down to see what's really so good about Deku's ass, and her breath catches in her throat.
Her waist, although not as small as Katsuki's, is still small and toned, her chest curved but mostly the same as ever. But her hips flare out, +

her ass /big and round/. It spills over the edge of the desk, her skirt riding up just enough that Katsuki can imagine the what her bare ass must look like. Deku shifts a little, and her ass /jiggles/ for a moment under the movement.
"Kacchan?" she asks, concerned, and Katsuki +

snaps her eyes back up to her, her entire face flushed.
"S-Shut up!" she says defensively, pulling her chair out and sitting down.
"O-Okay..." she hears Deku mumbles, and immediately feels guilty. Fuck.
It's whatever, though - Katsuki'll be over it soon. She was just... +

/surprised/, that's all. Of course she was, it's not like she was /expecting/ Deku to have such a fat ass. But she's seen it now, and it doesn't /matter/ anymore.
And she almost convinces herself too, because Deku sits behind her in classes, and they don't have any practical +

lessons for the rest of the day. When school ends, Katsuki goes straight back to the dorms, studying, training alone in the gym, cooking a meal, and then going right to bed without another thought about Deku's ass (correction: without /many/ more thoughts about Deku's ass). +

She's at peace with it, until she /dreams/ about it that night.
Deku's ass is its usual size in her dream, the size it was before puberty, and Katsuki's actually enjoying the dream, because she's absolutely /demolishing/ Deku in a fight. And then Deku falls over when Katsuki +

sends a particularly powerful blast her way, and suddenly when the smoke clears, Deku's ass has /grown/ to the size it was the afternoon just passed, and dream Katsuki has no qualms in reaching out and grabbing it, sinking her hands into the soft flesh. The scene shifts, and +

(tweet limit is katsuki's sleep paralysis demon 😒
also i've never written the ✨lesbian secks✨so please bear with me)

Katsuki's still /demolishing/ Deku, just in an entirely different way. Deku writhes underneath her, her face flushed prettily, and when she whispers, "Kacchan, fuck me /harder/!", Katsuki wakes up with a gasp. She's uncomfortably wet, her pajama trousers soaked through. She's +

still aroused, and she bites her lip to hold back a sound when she rubs her thighs together. Fuck it, she can't help it, she needs to get off. She grabs a pillow and flips onto her stomach, placing the pillow between her legs and humping against it with her face buried in +

another pillow. Her thoughts are full of Deku's ass, of spanking it and watching it jiggle, of making Deku cry from pleasure and eating her out with the green-haired nerd's thick thighs wrapped around her head. She grinds against her pillow with more and more urgency until the +

pleasure overflows and she orgasms, choking back a loud moan. She breathes heavily as she comes down from a high, and then buries her head back in her pillow when she realises what this means.
/She/ thinks that Deku is sexy.
It's a realisation that's about to make her life very +

difficult, because it turns out that she can't even /talk/ to Deku without glancing her curves, without recalling the way she masturbates to the thought of doing downright /filthy/ things to her every single night without fail. She's gone from going to bed at eight to going to +

bed at seven just so that she has more time to indulge in her fantasies. She's discovered kinks she didn't even know she had just from the amount of time she spends getting off to Deku, and she curses her friends for ever pointing Deku's looks to her. Hell, she curses Deku for +

changing at /all/. It makes it impossible to train with her, because Katsuki can't concentrate when Deku's ass jiggles in her costume, the seams straining just to contain her growth. She can't hang out with her, because she's too embarrassed to look her in the eye when she can't+

stop imagining Deku's face flushed and fucked out. Fuck, fuck, fuck. Deku's definitely noticed the shift too, and has only grown more determined to get Katsuki to spend time with her, but Katsuki keeps avoiding her. It doesn't help that Katsuki gets jealous every time someone +

flirts with Deku, and she knows it's only inevitable that someone's gonna snatch Deku up when Katsuki can't even talk to her, and her time away from her has only made her realise that her attraction to Deku isn't just /sexual/, which is fucking worse.
But it all comes to a head +

on a weekend when the class is taking a trip to the mall, and Deku walks in wearing a skirt that Katsuki would recognise anywhere. It's /Mina's/ skirt, the one she bought impulsively and never wore because it was so tight and short. And on Deku, it looks utterly /sinful/, only +

covering half her ass cheeks. She pulls it down self-consciously, but as soon as she moves, it rides up her fat ass, digging into the soft flesh. She's a walking wet dream, and Katsuki can't take it anymore. She marches up to her, grabbing her by the wrist and hissing, "You're +

not wearing that to the mall, you're coming with me."
"Kacch-!" Deku tries to exclaim, but Katsuki's already dragging her out of the common room towards her own room. Deku babbles protests as they approach Katsuki's room, but lets herself be dragged along. Katsuki doesn't even +

say anything until the two of them are in Katsuki's room, Katsuki locking the door behind them.
"Wh-What do you mean I'm not wearing it?" Deku tries again, a little defensively.
"You know exactly what I mean," Katsuki says. "Half your fat ass is on display, you're not going to +

the mall like that. How the hell did you get your hands on the skirt anyway? Did you mess around with Mina or something?"
Katsuki realises she's being too harsh as soon as Deku glares at her.
"I can wear whatever I want!" she retorts. "You don't get to ignore me for weeks and +

then tell me what I can and can't do, Kacchan! And /no/, we didn't mess around, for your information! She gave me the skirt because she said I would look good in it, and I think I look fine, there's /nothing/ wrong with my ass being... big."
Katsuki stalks closer to her, pushing+

her up against the bed so that the back of her knees hit the structure. Deku looks even smaller this close, her face at the level of Katsuki's chest. Her face is a little red as she stares at Katsuki's tits, and Katsuki cups her chin with two fingers, tilting her head up.
"Eyes +

up here, dumbass," she scoffs. "You don't get what I'm saying, do you? I guess that's my fault, considering I've been avoiding you. Yeah, there's nothing wrong with your ass being big as hell, and you can wear whatever you want, but /I/ don't want anyone seeing your ass like +

that. It's selfish as hell, but..."
"But?" Deku whispers, blinking up at her.
"/But/," Katsuki repeats, before continuing, "I want you all to myself. I've been fucking dreaming about you and your stupidly sexy body for weeks now, and I couldn't fucking look at you straight +

because of it. And /then/ you came down in that skimpy little thing and I decided there and then that I needed to fucking tell you how much I want you. I give you permission to slap me, /once/."
She expects Deku to push her away, to look disappointed or disgusted, to maybe +

actually slap her. But instead, she leans up on her tip-toes and wraps her arms around Katsuki's shoulders, dragging her down to connect their lips. Katsuki melts into the kiss immediately, and the kiss goes from tentative to messy in an instant, Katsuki grabbing at Deku's fat +

ass and moaning into her mouth the same time Deku does. They clamber onto the bed, still making out, and it's Deku who reaches to drag Katsuki's shirt over her sizeable breasts. They spring out, and Deku breaks away from the kiss so she can murmur a simple, "Can I?"
"Knock +

yourself out," Katsuki grins, and Deku dives right in, unclasping Katsuki's bra expertly so that she can bury her face in Katsuki's ample tits. She moves to suck at one nipple while pinching and rolling the other, knowing full well how sensitive they are as Katsuki gasps and +

arches up into the sensation. Deku switches a moment later, sucking and nipping like she's worshipping Katsuki's tits.
And that's when Katsuki realises that /wait/ a damn minute, Katsuki doesn't want the focus to be on her. She wants to play with Deku's ass, she wants to eat her+

out, she wants to make /Deku/ flush and pant and beg, not the other way around, so she tugs at Deku's hair, making the petite girl pause and look up at her. Fuck, she looks so pretty nestled between Katsuki's tits, gazing at her through half-lidded lashes.
"Yes, Kacchan?" she +

says breathlessly. "D-Do you not like it?"
"I fucking /love/ it, but you can play with my tits all you want another time," Katsuki says, Deku's eyes lighting up at 'another time'. "Right now... I want you to sit on my face."
"What!?" Deku yelps.
"I've been fucking fantasising +

(tweet limit two, electric boogaloo
...yes i've said that before, i just love the phrase, leave me alooone
lmao am i killing the mood)

about your big ass, Deku, I know what I fucking want," Katsuki insists. Deku nods, rising to her knees. The skirt is still digging into her thighs, and when she spreads her legs apart a little further, it rides up completely over her ass, revealing her big, round ass and her +

panties, the fabric of which are wedged between her ass cheeks like she's wearing a thong. Deku shuffles up until her poorly covered pussy is hovering over Katsuki's face, her panties absolutely drenched, and when Katsuki looks up at her properly, Deku shoots her the sexiest +

grin she's ever seen. /Fuck/, when the hell did she get this fucking hot? Katsuki can't believe that she's never noticed it, that she was so accustomed to the nerd that she never realised just how fucking beautiful she is. Her curls frame her heart-shaped face prettily, the +

faint blush across her cheeks only accentuating her freckles.
Katsuki growls, grabbing her wide hips and forcing her to sit down on her face. And fuck, Deku's ass is big and /heavy/, but Katsuki loves the weight of it against her face, loves the way her clothed pussy presses +

against her mouth. She moves her panties to the side with her teeth and licks long and slow between her folds, making Deku whimper. Katsuki chuckles underneath her, repeating the motion as her hands slide down to grasp two plump handfuls of Deku's ass and make it jiggle +

deliciously. Her nose buries itself against Deku's small green curls as she moves up to suck her clit, biting at the sensitive bud softly and making Deku cry out before she returns to lapping at Deku's leaking pussy eagerly and moaning softly.
"Mmmhh, Ka-Kacchan, t-that feels +

s-so goooood, ohhh," Deku pants, her words descending into high-pitched whines and moans when Katsuki thrusts her tongue into Deku's tight hole. "O-Ohhh, K-Kacchan, y-yesss, ohhhh!"
She starts to bounce against Kacchan's face, making her generous ass cheeks shake and clap in a +

way that has Kacchan moving one hand down underneath her own clothes so that she can rub at her clit. She has to be careful to angle her fingers so that her explosive sweat doesn't drip down from her palms, but she can't help it - Deku's so fucking /sexy/, her body so utterly +

irresistible, and Katsuki's never been so /fucking turned on/ before. Deku's getting louder and louder, bouncing her fat fucking ass harder against Katsuki as Katsuki bobs her tongue in and out eagerly. Her face is soaked from how much Deku's dripping against her face, but with+

Deku shaking her ass against Katsuki as she rides her and her hole clenching around Katsuki's tongue as she goes deeper, Katsuki couldn't care /less/.
"K-Kacc-Kacch-hhhh, mmhhhh!" Deku moans prettily, unable to form a full sentence. "I-I-I'm g-gonna, K-Kacc-ohhhhh /god/, Kacchan+

pl-please, I-I'm gonna-!"
Katsuki's hands move to Deku's thighs as she quickly flips them on the bed so that Deku's hair falls in a halo around her as she lies against the sheets, whimpering. Katsuki leans up, wiping her mouth and grinning even as Deku rocks against the mattress+

in a desperate search for the friction she's lost.
"Patience, baby, you're doing so fucking well," Katsuki purrs, stripping down and flinging her panties aside so that she's as naked as Deku. "Fuck, you're so /beautiful/, you know that, Deku?"
Deku just gasps softly, arching her+

back in pure desperation. Katsuki's hands slide up her thick thighs as she spreads Izuku's legs further, exposing her pretty, pink, leaking pussy. She moves forward so that she can sling one of Deku's legs over her shoulder and slot their bodies together.
"K-Kacch-mmhhh!" Deku +

cries out when Katsuki rubs their pussies together, a low moan of her own spilling from her lips. Deku bucks her hips up, and Katsuki grinds back against her, the two of them building a merciless pace together as they chase their release.
"F-Fuck, fuuuck," Katsuki groans, +

hoisting Deku's leg up higher so that she can rub their clits together properly. Deku's hands scrabble at the bedsheets as she arches her back even more, drool spilling from her open mouth. Fuck, it's better than Katsuki could've ever imagined, and she can't stop her legs from +

trembling as she rocks faster and faster against Deku, watching her ass jiggle and shake and /bounce/ from the movement.
"S-So cl-ohhh-closeee, K-Kacc-aahhh, ahhh, ahhh!" Deku screams, her eyes rolling back as she /squirts/ when Katsuki rubs and pinches Deku's clit with her +

slick-soaked fingers. Watching Katsuki's fantasies come true right in front of her, feeling Deku drip all over her own pussy as she reaches a shaking hand down to rub at Katsuki's clit... /Fuck/, it's too /much/, and Katsuki arches forward against Deku, choking back a pleasured +

sob as she squirts too. The two of them pant, their eyes fixed on their wetness as they continue to rub against each other through the high. When they finally come down from it, they collapse against each other, Deku nuzzling up against Katsuki's naked tits. Somehow, the feeling+

of wrapping her arms and legs around Deku and snuggling her is just as good as the sex, and Katsuki's heart feels warm to have Deku near her again.
"Mm, Kacchan, what about the mall?" Deku mumbles a while later. "Do you think they're wondering where we are?"
"Forget about them,"+

Katsuki says confidently, leaning down to brush the hair away from Deku's forehead so she can press a soft kiss against it. "We can tell them later."
"T-Tell them what?" Deku stutters, blushing.
"That I was spending some quality time with my girlfriend," Katsuki says. Deku's +

eyes widen.
"Girlfriend?" she echoes hushedly, like she can't quite believe it.
"/Duh/," Katsuki responds, flicking her nose affectionately. "I'm not fucking giving you up."
"Then neither am I, Kacchan," Deku sighs happily, closing her eyes against Katsuki with a smile.
END.

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