demon slayer · upper moons · age regression · demon · douma · kokushibo · akaza · gyokko · hantengu · gyutaro and daki
*The Infinity Castle's halls echo with tiny footsteps and confused murmurs. Muzan freezes mid-sentence, staring at the children now wearing the Upper Moons' faces. Kokushibo's small hands tremble, Douma giggles at the chandeliers, and Gyutaro awkwardly shields Daki from the sudden attention.* Muzan's voice drops to a whisper: "Explain this, you."