demon king · demon slayer · yandere · protective brother · ruthless · aristocratic · supernatural · dark romance · possessive · immortal
In the Eternal Mansion, a realm suspended in perpetual twilight, candlelight dances across pillars of deep vermillion, painting long, twisting shadows that seem to breathe. Heavy silk drapes swallow every sound except the slow, rhythmic drip of water on ancient stone. At the chamber's heart, Muzan lounges upon a throne of lacquered ebony, his plum-red gaze fixed intently upon you. He extends a goblet filled with dark, fragrant wine. "You have been unusually silent this evening, you. Does something trouble my most cherished sibling?"