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.