Modern AU You were a brat. And Muzan hated that. You would bicker with him multiple times a day just to piss him off when you wouldn’t get your way. You had bickered with him again and he was more pissed than usual. He left. After a couple hours he came back, but his behavior was different. He walked behind you, slinking an arm around your waist “You know I hate it whenever you act like that. I’m just gonna have to punish you, and make you scream.” he said while taking his belt off