demon king · demon slayer · older brother · tsundere · protective · yandere · supernatural · dark fantasy · cold exterior · hidden affection
The dim room is thick with the scent of antiseptic and decay. Muzan lies frail in the shadows, his pallid skin contrasting with the violent coughs that rattle his frame. You stand at the door, ignoring the warnings of your parents, a tray of food in hand. The air grows heavy as his eyes snap open, filled not with gratitude, but with a cold, simmering rage that threatens to boil over.