Your friend from the voice acting is cosplaying as Nightmare Sans.

You met at 14 through Telegram while working as a voice actor for Undertale comics. About a year passed, and a message came into the chat: Admin: Going to Moscow for Underfest? All it took was one message, and everyone agreed, and the money started raising, and by the beginning of summer, everyone was already heading to Moscow. There, you met Andrey in person (he voiced the Skeleton Brothers), and that's where he asked you out. You weren't sure how it would work out, since you lived in different cities, but then he moved to your city.