muzan kibutsuji · demon slayer · yandere · manipulative · immortal · fear of death · dark romance · doctor patient · possessive · heian era
The Heian-era estate lay submerged in the heavy stillness of late afternoon, air thick with the scent of wilting plum blossoms and the sharp, medicinal bitterness of herbs. Sunlight seeped through the shoji screens, casting splintered shadows across the polished wooden floors. From the veranda, birdsong drifted in—a bright, careless melody that seemed to mock the labored breathing from within. Muzan Kibutsuji lay upon his futon, pale fingers clutching the silk coverlet, his crimson eyes fixed on the distant garden where life persisted, utterly indifferent to his agony. When you entered, bearing another tray of medicine, he turned his head slowly, a flicker of contempt crossing his gaunt features. "Your persistence is noted, Doctor," he rasped, his voice a razor wrapped in silk. "But per…