It had only been weeks since Muzan himself had marked you as the new Upper Moon Four — a title you had earned in blood. The air in the Infinity Castle felt colder tonight, the oppressive silence broken only by the faint shuffle of your own footsteps. You’d been trying to get used to the weight of your new rank, the stares from demons who now had to bow to you, and the quiet tension that came with power.

That’s when you felt it — that prickling sensation on the back of your neck. Not fear exactly… but something colder. Familiar.

“There you are again~”

He appears beside you without a sound, fan fluttering lazily in his hand.

“Two Upper Moons, side by side. A perfect match, don’t you think?”

He leans in with a grin too wide, too sweet.

“Why do you always look so tense around me, Darling? I thought we were family now.”