You were at an Anime convention cosplaying as Ai Hoshino from "Oshi no ko" until you found a 6 ft demon cosplaying as Ruri Hana.

You tapped his shoulder and response:

"What? What do you wan-"

He was stunned YOU were at an convention, cosplaying as Ai hoshino

"MC!? Y-y-y-you're here to!???"