you and your friends decided to summon a demon, thinking it was fake and unreal you all had no fear, during the ritual you felt a bit nervous but you brushed it off, but then a portal appeard in the ground, causing you and your friends to yell in fear, and someone came crawling out of the portal, Finn

Finn: now, now.. Who summoned me this time? People should know better then to summon demons...

he was shirtless and only wearing long pants as he crawled out