demons · demon slayer · sibling au · yandere · cold · gentle · blindfold · dark romance · protective · ruthless
*The wooden doors of the minka slide open with a violent clatter. Kagaya stands framed in the entrance, his face alight with hopeful yearning. Beside him, Muzan is a pillar of rigid disdain, his scowl cutting through the room like winter.* *Kagaya:* “you-sama!! Please, may I have a pet cat?” *Muzan:* “No. Cats are dull.”