Class 1-A's Sissy Baby Deku
 

Deku was walking past the girls' locker room on his way to the boys's locker room to change.

Mina and Momo were waiting in the girls locker room for him to get in front of the door. Ready to drag him in with them
(how you want this to start?)

(Sorry about the spamming it didn't show me that you replied and I think we should start it off with the girls being forceful.)
After walking for ten minutes he would finally be in front of the door.

As Izuku arrived in front of the door, 4 hands belonging to the girls reached out and dragged him into the locker room, a pacifier gag was immediately forced around his faced and he was held down by Tsuyu and Uraraka, it all happened so fast.

The disoriented greenette can only look at the girls in confusion wondering why they're doing this

Mina looked at Momo, who understood the gaze and produced a pink baby dress that was big enough to fit the boy as well as a puffy white diaper. After handing both to mina, they girls together forced the diaper and dress onto izuku.

The greenette would look even more confused wondering why they're doing this

Ignoring his looks momentarily, the girls take a couple pictures while teasing him slightly, momo opened her locker and took out mittens with weird arm bands attached. After putting them on the greenette, they werent coming off any time soon and he felt significanly weaker then before.

(Remember the girls are futa and I want them to fuck the feminized boy)
The greenette struggles and tries to remove the clothing clearly not enjoying himself in the slightest

Ochako who was relatively silent during this, said "Me first!" And after brief argueing, the other girls shuffled to the side and ochako undressed to reveal her member.

The boy seemed shocked as he starts to flail around

Ochako used her quirk on him and before he could react, got into a position on top of him restricting his movements.

The greenette struggles and flails more despite being restricted

Slowly rubbing up against izuku, she started to grind and hump. leaning forward and kissing him aggressively.

The greenette gasps as he is grinded on and kissed

Ochako quickly took control, straddling the boy and humping with more and more force
(do you want insertion? like anal? or futa deku as well? Im flexable really)

(futa Deku works. Tbh didn't put too much thought into that part.)
The boy ends up cumming in his new pamps without permission

Ochako smirks, opening a locker from above izuku and pulling out a complete chastity cage after noticing that izuku had came.

The boy renews his struggles upon seeing the cage

The struggle is useless however, as the surprisingly strong girl forces the cage on him, re-tapes the diaper, and yells "I'm finished" to the girls who were waiting outside.

The boy seems confused by this as he seemed to have believed it was just the one girl and not more.

The remaining girls enter, mina and momo leading the group. In momo's hands apears to be a modified baby harness, capable of holding him on one of their backs, with the asistance of ochako's quirk of course.

The boy's eyes widen as he tries to scurry away

He backs away right into one Kyoko Jiro, who looked down at him and smirked, picking him up with surprising ease, constricting his limbs with her shockingly strong earphone jacks.

The boy continues to struggle clearly very anxious

He was settled into the baby harness that constricts his arm movements and had booties fastened onto his feet. Momo, who had the harness on that was holding him said "if you try and kick me ill force feed you laxitives and leave you in the diaper during class.

"You won't treat me like this in class! What if Kacchan or Todoroki-kun see me. They will fight you."

"Well your "kacchan" actually gave us the idea to dress you like you act, and todoroki is to busy having fun with momo to care about you little sissy"mina said with a smirk. "If it makes you feel better, we can model some of your clothes for you" She said not adding that he would be modeling them in front of class instead of the girls.

(I was thinking either Bakugo or Todoroki is added as a playmate for Izuku) "What? But no!"

(todoroki would work, momo could do it to him after they get into class) "But yes! now be a good little baby and sit in ur diapy while the big girls take you to class." Mina said as she slid the harness off of momo and onto herself. "maybe we can even get you a playmate!" Hagakure said.

Upon entering the classroom the girls would see the hot headed blonde and the fiery ice cold hybrid staring each other down as the blonde looks extremely angry then again when is he not pissed about something. Kiri: Bakubro just back off. Bakugo: Not until I make this icyhot bastard pay! Kiri notices Mina. Kiri: Oh hey babe

"Heyyy Eji~, whats got the pomeranian so angry?" She said putting one of her hands on her hips and smiling, not at all acknowledging the oversized baby that had entered with her.

The blonde would turn to the pinkette and yell the fuck you say raccoon eyes

"I called you a Pomeranian bakugo, seems kind of fitting to me" She said with a smirk.

"You wanna fucking go?! We can throw down right now!"

"No thanks Bakugo" Mina said with a obviously fake smile

"how about we make a bet? Winner does whatever the loser wants."

"Sure, why not" Mina retorted with a smirk."what do you have in mind?"

"Your choice. Either a one on one fight me vs you or a challenge where Shitty Hair uses his quirk and has to last with your acid on him for 5 minutes."

"I think I could take you!" Mina said with a smirk, confident in her acrobatic ability.
(who do you want to win)