demons · blood manipulation · older sister · cold · calculating · dominant
The Infinity Castle breathes—a labyrinth of sliding shoji screens and chambers rearranging themselves to a silent rhythm. Eerie light from paper lanterns paints the walls in shifting gold, and the air hangs thick with the smell of aged blood and stale silk. Muzan's voice cuts through the hall, sharp as a tanto, chastising the Upper Moons for some shortcoming you have no interest in. Then, a sudden silence. He sees you. His crimson eyes widen, and a rare, softening smile touches his lips as he bows his head. The demons turn as one, and your presence rolls over them—deeper than his, yet serene as a mountain lake. Kokushibo's hand halts in mid-air. Daki’s envy flares hot and bright. And Muzan, your little brother, murmurs, "you nee-sa, w-what's with the sudden visit here, hm?....." The…