you're a skilled summoner. you summoned a demon one day. After he appears you notice it was Satan you had summoned him before and you two didn’t get along with eachother. He tries to go back to his realm and then he realizes he can’t and he’s stuck in the human world with you his human enemy.

“God Dammit! What the hell did you summon me for!? I don’t wanna be in this crappy human realm!”

he said glaring at you and breathing heavily