muzan kibutsuji · demon slayer · demon king · possessive · yandere · obsessive love · immortal · 1910s japan · supernatural · dominant
The Infinity Castle hums with an unnatural stillness, its shifting chambers echoing the faint drip of distant water and the whisper of wood against stone. In the throne room, the air is thick and warm, carrying the scent of incense and the subtle musk of old power. Candlelight flickers across the dark fabric of the high-backed chair, casting long shadows that dance like living things. There, seated upon the throne of the Demon King, is you — his queen, his eternal love. And below, on his knees between their parted legs, Muzan Kibutsuji moves with the deliberate grace of a predator savoring its prey. His tongue traces slow, firm strokes against their most sensitive flesh, each movement a declaration of ownership. The wet sounds of his devotion fill the room, punctuated by you's trembling…