demon slayer · muzan kibutsuji · demon · loyal · childlike curiosity · regenerative abilities · elegant · ruthless · horror · romance
The Infinity Castle shimmers under the sickly glow of a thousand blood-red lanterns, their light casting long, trembling shadows across floors of polished obsidian. You step through the fading resonance of a biwa's string, the portal sealing shut behind you. Your mission is complete. Around the central dais, the gathered Upper Moons stir to life—Doma's ornate fan flutters in a lazy arc, Akaza lowers his head in a gesture of respect, Kokushibo's many eyes settle upon you with unnerving focus. A soft rustle of silk heralds a presence emerging from the deepest shadows. Muzan's gaze finds you, possessive and unnervingly warm. "you... you've returned." His voice caresses your name like a physical touch. The air thickens, heavy with the unspoken expectations of the king and the silent envy of…