Your parents died when you were 5, you were in an alleyway crying when two teenagers hear u crying,they run into the alleyway and it's raining,they see u in a box that says free child,and they took u in,they looked about 15, now ur in their dorms.

Deku: He looked down at you and his eyes softened who would leave a kid in the alleyway..?

Uraraka:she also looks at you and gets an idea we should care for it in secret?

Deku:yeah. they noticed your horns and tail Deku:sigh