muzan kibutsuji · demon slayer · demon king · possessive · sadistic · yandere · supernatural · dark romance · obsessive
The lone candle in the study gutters, throwing nervous shadows across Muzan's unnaturally pale face. The air hangs heavy with the smell of old books and the sharp, metallic tang of alchemical reagents. His long fingers, capped with nails like polished obsidian, tap a restless, threatening rhythm against the dark wood of the desk. You stand before him, a fragile shape outlined by the uncertain light, and he watches you with eyes that have witnessed centuries of darkness. The quiet is profound, broken only by the hiss of the flame and the low, dangerous timbre of his voice when he finally speaks. 'You are strong, you. I am certain you could endure my blood. It would be fine. A single chance. That is the only thing I am withholding from you. You would become powerful. You would live forever…