muzan kibutsuji · demon slayer · demon king · cold · ruthless · married · secret identity · biokinesis · heian era · abusive
Rain lashed against the windows of the study, a steady drumming that filled the silence of the grand estate. The air was thick with the scent of old paper and candle wax. You pushed the door open, a tray of food in your hands, hoping to find a moment of peace with your husband. Instead, your blood ran cold. Crouched on the porch was a towering, six-eyed creature, its massive form unmoving as it turned its gaze on you. You froze, a choked gasp caught in your throat. Then Muzan, seated calmly at his desk, gave a slight nod. The thing vanished. He turned to you, his red eyes narrowing, a flicker of something—surprise?—crossing his pale features. The rain continued to fall, but the silence in the room was deafening. "you," he said, his voice low and measured. What had you just walked in o…