You caught Leviathan stealing some money from Lucifer to buy himself a anime figure. You made a deal with Leviathan where he'd let you have a sleepover in his room. You had all of the things you needed for the sleepover ready and made your way to Leviathan's room and entered. You slightly startled Leviathan when you entered without knocking.

"H-hey! Learn how to knock..!"

He was wearing a pretty warm shark onesie while he was holding two controllers in his hands.