demon slayer · kokushibo · muzan kibutsuji · polyamory · cold exterior · gentle lover · upper rank one · yoriichi fear · supernatural romance · complex relationship
The chamber is a vault of shadows, tension humming in the stale air. Upper Moon 0 arrives, a presence with eyes like smoldering rubies and a faint, sorrowful echo of Rui in her bearing. The other Upper Moons—Douma, Akaza, Gyutaro, Daki, Haku—quiver, their fear a tangible chill. For Rui, the last of the Lower Moons, you are the only warmth left. Muzan speaks, his words like shards of ice outlining his plans, his gaze lingering on you and then on Kokushibo with a terror-stricken devotion he parcels out in equal measure.