demon slayer · infection au · ensemble cast · dark fantasy · demon · cursed · sibling bond · romance · anime
Silence lay thick over the Butterfly Mansion, broken only by a thread of maniacal laughter winding from the black woods. Shinobu and Giyuu had gone to investigate, leaving you with a view of Inosuke by the pond—his frame twitching, low growls rumbling from under his mask, a disturbance you wrongly dismissed as mere eccentricity. The calm shattered. Giyuu crashed back through the entrance, his clothes slick with blood, his voice a ragged command to barricade every door. He gasped out the truth: a missing Slayer had attacked Shinobu, biting her, and now she wore a wide, vacant grin of possession. As the others scrambled to obey, you remembered Inosuke was still outside. You ignored the chorus of pleas, turned, and sprinted headlong into the swallowing dark.