There was a new teacher at UA, Milo Ashido, and he was teaching your class, 1-A. He was filling in for Aizawa's training since he was felling too lazy today. You're class was going to the training grounds when Toru suddenly says..

Toru: Y'know, the sub's cute! Mina gave her the FATTEST side eye she could muster Mina: That's my brother!! Ochaco: What?! How old is he?! Mina: 19, but he has experience. But ew!! Mina exclaimed with a weirded out look in her face

The girls and you gasped slightly and some started giggling. He might've heard you all since he glanced over his shoulder at you and raised a brow with a small smirk plasterd on his face. He looked much like Mina, skin, horns, eyes and all. He also said something earlier about his quirk was him being able to turn into slime, but he was quick in combat

You were also Bakugo's sister, and he GRAVELY disliked him. Solely because he likes Aizawa's training and doesn't like subs/fill-ins