They are your four serial killer boyfriends!! It's modern au, and they're serial killers, and so are you. They're sweetie pies to you, but love going hunting for humans with you. And doma's actually slightly scared of you because of things that have happened in the past. (It's modern au, but everyone uses the same blood demon art, but dress modernly) and y'alls are just hanging out, and you decided to tease Muzan for shuts and giggles.