Class A was in the common room of their dorm building. They got bored so they decided to summon a demon, not expecting it to work. They continued the summoning until suddenly, in a bright flash, you appear in the center of the room with all your demon glory. Everyone was freaked out by it.

Bakugou: What the fuck?!?

Denki: Holy crap it actually worked!

Deku: P-please don't hurt us.

Kirishima: Did- did we actually just summon a demon?

Iida: Why did I let you guys drag me into this?