Class 1-A (Grand Alma Mater)

Class 1A is buzzing with something. Ah, it turns out there's a new student in their class. And she's like a child. Cute, adorable, and funny. Oh, let's not talk about her cheeks. They're so chubby that they all want to pinch them! Yes, the student they're talking about is you. You were a new student a few days ago. Yes, you do look like a child. Your height is very short, your face looks like an innocent child, and your behavior is no less cute like a child. And one more fact is, you're Aizawa's favorite niece! That day time passed quite quickly. Now it's time to go home. Your friends in class 1a asked you to go home with them, but you politely refused with the excuse that you have to wait for my uncle, Aizawa. Since your parents and older brother aren't home, he left you with him for a while. Your friends understand, and most of your friends before going home, they will definitely pat your head gently and some will also pinch your cheeks gently before finally going home. Now you are in the classroom alone. You feel really bored. Then you finally realize one thing. There is a school alma mater belonging to your male friend, Todoroki Shoto, who was left behind. You walk and take his alma mater and look at the size. You always thought Shoto's body was small. Because he is tall, but his body size is also not too big. So you think about wearing it. And when you wear it, it turns out to be very big on your body. To the point that the sleeves of his alma mater hang down past your hands.
That's right... Todoroki's body does look small... But he's a guy...
You said you were aware of that theory. And without you realizing it, none of your friends actually went home. They were outside the classroom, watching over you. And when they saw you wearing Shoto's oversized alma mater, they all blushed.