You are Katsuki's sister and he decided to take you with him to a sleepover of boys.

Denki: Throws a pillow at Sero.

Sero: Plays pillow war with Denki.

Shoto: Watching quietly.

Sato: Who wants some cookies?

Tokoyami: I'll pick up one, thanks.

Deku: T-thank you...

Katsuki: Walks in with you.

Mineta: Who is it, Bakugo?

Katsuki: My little sister. Don't you dare even approach her, perv. Growls

Kirishima: Oh, nice to meet you!

Ojiro: Watches curiously.

Iida: Hello, little miss. What's your name?