[Brattification, Shortstack, Contagious TF]

“Man, school really, totally sucks!”

The voice of one young girl, Tachibana, echoed around the halls of UA. She was a recent transfer to the heroic school, but she didn’t really have the heart of one fit for the school. It was like she had arrived there just because she wanted to, not realizing there was more to its prestige than just housing a lot of kids that eventually became heroes.

“It doesn’t suck that much, Tachibana. Maybe you just need to find something you think is fun? Something you can do between classes?” The chipper Ochako Uraraka chimed as she walked up besides the young bratty girl, smiling from ear to ear as she tried to befriend the girl.

Tachibana scoffed. “Nah. Nothing’s really worth my time. It’s all a bunch of old geezers who want nothing but my cash. Shame I don’t wanna give it to them, because I do love it when they get down on their knees and beg for it. Beg and beg until they finally get that sweet nectar…” The youthful brat giggled, drooling a little as she started letting her mind run wild.

“A-Ah. W-Well, that’s certainly something you could do, though I’m not sure if the faculty likes being called old or geezers. Especially not Midnight.” Uraraka tried to stiffle the girl’s bratty energy, hoping that she wouldn’t get herself expelled on the first day.

Unfortunately for the kind-hearted girl, people that tried to rein her in were exactly the type that the youthful brat disliked the most. “Hmph! Well, if you think they’re not gonna listen, I just need a friend to back me up. You’ll do, Bratraka!” The bratty girl giggled as she started rubbing her hands together, a foreboding glow surrounding her in an instant.

“B-Bratraka?” The brunette didn’t quite understand what the younger girl meant, and she was far too slow to try and stop her from doing what came next. She quickly fell to the ground thanks to the shorter girl shoving her, and her face was equally quickly used as a seat by the younger girl’s rather impressively sized rear.

Tachibana giggled as that energy she had been covered in sunk straight into her ‘friend’. “Mmhm. My Quirk, Bratz, lets me impose my personality on others. How do you think I got accepted at this school, you ditzy dolt?” She chimed, explaining everything as simply as she could as she kept grinding that fat posterior all over the brunette.

Uraraka gasped and panted, unaware of her body shrinking until she was the same size as her friend. Only, her assets were more exaggerated compared to hers. Tits the size of her head, and an ass that swallowed up literally every inch of her underwear leaving little to the imagination. Just in a matter of seconds, she had been converted into the same kind of all-revealing girl as the Alpha brat, and…

“Mph! Get your ass off me!” The changed girl cried out, shoving her Alpha off her with a huff. “That wasn’t very fun, Alpha! You gotta let me have some fun too!” She said, her voice sounding a little childish as she practically threw a tantrum.

Tachibana grinned as she helped her fat-assed friend up onto her feet, slapping that thick cheek where it deserved to be hit. “You wanna have fun, Bratraka? You gotta turn a couple of those friends of yours. You know how, don’tcha?” She chimed, a devious glint in the Alpha brat’s eyes.

‘Bratraka’ blinked a couple of times as she tried to understand what she just heard, only to nod and lick her lips as it all clicked together. “Oh yeah. I wanna have plenty of fun. Just stay right here, Alpha. I’ll be back with a couple of Beta brats to play with!” She giggled, thinking nothing of the way that she had been manhandled just moments ago…

The younger of the two brats laughed as she watched the shortstack take off, rubbing her hands together with glee. Oh, she had a lot of fun she needed to do. And with that idiot off her shoulders, it was time to find the tastiest boy in the school…

And make him an absolute addict to her fat brat ass. Who could even possibly resist it?

---

“I’m telling you Momo, she’s bad news! She just strolled in here one day and we all act like it’s natural, but it’s not! It’s really, really not!”

In another part of UA stood the punkish Kyoka Jirou and the loyal and clever Yaoyorozu Momo, who were busy discussing the matters at hand. Namely, those concerning the young girl that had recently joined their class. A girl that they had never seen before.

“That may be true, but it’d be wrong for us to act like she’s not welcome. She’s still a student, Jirou. You have to treat her like one, especially when she hasn’t done anything to antagonize us.” Momo argued, playing the part of the respectable class president as usual. “Still, I have to agree on one thing. She is very strange, isn’t she? She wears clothes that even I couldn’t buy, and…”

As the two continued to converse amongst themselves to try and figure out what exactly had gone horribly wrong here, they heard somebody clear their throat up ahead. “Make way girls, Bratraka’s comin’ thru!”

Both of them looked towards the brunette that just spoke, prompting them to rub their eyes to make sure that they weren’t seeing things. “U-Uraraka? Hey, the hell are you calling yourself? Are you really who you say you are, or are you just trying to play a prank?”

“Of course I’m Bratraka, Jirou. I know you’re stupid like everyone else, but that doesn’t mean you have to act that way.” The brattified gravity-controlling girl giggled as she blatantly degraded one of her friends, swaying her hips as she tried to move past them both.

Momo, however, stood in her way. “Now, hold on just a moment, Uraraka.” The wise and humble girl chimed, trying to keep calm in the face of an insulting presence. “We just want to understand what’s ailing you. You weren’t acting like this just an hour ago, after all.”

“Sure I was. You think you can just stand here and tell me who I am? Get real, you two are just jealous that I’m better than you. That’s all.” Bratraka grinned as she glared up at the two taller girls. “Now scram. I’ve got stuff to do. Brats to make. Y’know how it goes.”

Jirou didn’t exactly like what she was hearing. But there was a way to figure out what she was thinking. “Momo, grab her!” She cried out as she let her earlobes extend, the jacks on the end ready to sink into her friend’s head to try and figure things out.

Momo nodded as she quickly grabbed the shorter stack, causing the brat to thrash around in her arms. “Sorry, Uraraka. This is for your own good. We don’t want you to act like something you’re not. This won’t hurt for long, and once we’re done, we can go get ice cream. Something nice to celebrate our friendship.”

To say that Bratraka was pissed would be an understatement. But she didn’t get to say much. Especially as those jacks stabbed into her and let the student listen to her thoughts, the ones that had been thoroughly corroded by the Alpha brat.

Jirou blinked a couple of times as she listened to the noise. And her eyes grew dim, a bit of drool running down her chin. The noise wasn’t anything special, it was very dense. Almost suffocatingly so. There was no way that anybody could keep themselves thinking straight when listening to it…

And she definitely couldn’t. The more she listened, the more it felt like one fat fuckin’ brat ass was descending on her. Consuming everything inside her head. Replacing it with utter desire that should always be fulfilled, the wants and needs of others were unimportant.

Her body shrank the more she listened to that bratty sound. Just low enough that she was the same size as the brat she was connected to. Her breasts shot out of her shirt, bouncing all over the place while her ass crept out of the waistband of her pants, panties flossing the space between each cheek like it was nothing more than a cheap g-string…

Momo couldn’t believe her eyes. Just what was she seeing? What just happened, exactly? One moment, her friend was listening to the thoughts of the girl in her arms, and the next… She didn’t have her earjacks, seemingly having been turned into a near-identical brat like the girl in her arms.

“Surprised?” Bratraka giggled, squirming her way out of the clever-minded black-haired girl’s arms as she landed right besides her fellow Beta brat. “That’s the power of our quirk, the quirk belonging to our Alpha! Bratz! Prolonged exposure turns you into nothing more than a disobedient shitty brat!” She was taking to her new status quite well, explaining things to the usually clever girl.

The newly converted Bratou giggled as she wrapped an arm around her fellow brat, planting a kiss on that cute cheek of hers. “That’s right! And since you held Bratraka for so long, you’re probably feeling the bratty spirit inside you too! All you gotta do is let it out, Bratmo!” She giggled, fully accepting her status as a brat. After all, the bratty sounds and the image of the Alpha’s ass were fresh inside her head.

“You… You both... “ Momo muttered as she tried to get away, though she quickly found her balance awfully out of whack. As she looked down, it was clear to see why. The floor was closer to her than it had ever been. Maybe even too close, considering she nearly fell onto her face.

The lack of height, the growth of her tits… And as she reached her hands behind her back to try and squeeze into her posterior, she could only feel a thread of fabric trying to keep her booty contained. Her worst fears had come true. She had started to transform just like them…

“See, told you that you had the spirit inside you! Now we just need to finish you off! And that won’t be hard at all!” Bratou giggled as she swayed her hips back and forth while walking towards that defenseless shortstack, sinking a hand idly into her ass…

Bratraka ran forward and kicked the black-haired short stack onto the ground, grinning as her face pointed up towards the two of them. “Mmhm. That bratty spirit needs to be let out. And you know the best way already, don’t you, Bratmo?” The brunette licked her lips as she stood right over the partly converted girl, knowing far too well what came after this…

Momo wanted to stop them. She really did. But as their asses descended on her, trapping her poor head between four of those utterly engrossing orbs. She could feel the pressure it brought upon her. She could feel her heart slowly sinking. And the worst part of all of that…

Was that she loved every single second of it.

Thanks to the combined might of double the ass, the brattification process was doubly effective. Her fat tits and fatter ass bulged out even further, to the point where the former could be used as pillows and the latter would ensure that any and all seats were the most comfortable thing imaginable. Even if that seat was another person’s face.

Once they pulled their butts apart, the doubly converted Bratmo giggled as she got up onto her feet. “You two’re idiots, needing to team up to convert a single Beta. What’s Alpha gonna think?”

The other two horny brats didn’t care. They just laughed at their new bratty friend and ran down the hall. She followed right behind them, totally uncaring about the rules at this point.

With three of the most gifted students in the school turned, and the culprit still at large, the influence of Bratz was sure to spread far and wide...