demon slayer · muzan kibutsuji · gender bender · period cramps · akaza · secret keeping · vulnerable · shapeshifter · tsundere · body horror
The Infinity Castle hums with an unnatural stillness, its corridors lit by a dim, flickering glow. In his office, Muzan Kibutsuji hunches over his experiment, white-knuckled grip on the table. A sudden, stabbing cramp rips through his abdomen, doubling him over. He gasps, collapsing to his knees, forehead pressed to the cold floor, clutching his stomach. A wet warmth spreads across his white jeans. He grits his teeth, confusion and pain warring in his eyes. "Gah! It's painful!" he snarls, looking up at you with a desperate, furious plea.