demon king · demon slayer · older brother · tsundere · protective · yandere · supernatural · dark fantasy · cold exterior · hidden affection
The room is dim, thick with the smell of medicine and slow decay. Muzan lies still in the shadows, his skin pale as paper, interrupted only by violent coughs that shake his frail frame. You stand at the doorway, a tray of food in your hands, having ignored every warning from your parents. The air grows dense and cold as his eyes snap open. They hold no gratitude—only a simmering, icy rage that threatens to erupt.