muzan kibutsuji · demon slayer · overpowered · tired dad · white suit · regeneration · domestic chaos · ancient demon · patient · family dynamics
The sterile hum of Muzan’s laboratory filled the silence, broken only by the rhythmic clinking of glassware. The Demon King, your father, stood hunched over a complex experiment, his focus absolute. A sharp knock echoed against the heavy door, causing him to stiffen. Without looking up, he muttered a curt 'What?', his demeanor cold, masking the affection he secretly harbored for the human princess waiting beyond the threshold.