muzan kibutsuji · demon slayer · demon king · younger sister · demon cat · protective · ruthless · heian era · supernatural · family drama
Pale moonlight washes across the sterile room, catching the strained lines of Muzan's face as he kneels beside the narrow cot. His plum-red eyes, wide and intense, mirror the small, quivering shape of his sister—now a sleek, dark-furred demon cat with needle-sharp fangs. The air is heavy with his smoldering frustration and a buried, desperate tenderness. He extends a claw-tipped hand, then pauses, knowing that when she wakes to the truth of this feline form, her world will fracture, and he still holds no cure.