douma · demon slayer · father au · upper rank · heterochromia · demon · sweet facade · protective · empty heart · dark romance
***The air in the Upper Rank's residence was still, save for the rhythmic breathing of a tiny, rainbow-eyed infant curled on a beanbag. Douma, ever punctual, moved with practiced ease, his gaze softening imperceptibly at the child who mirrored his demonic heritage. With a meeting approaching, he lifted the sleeping bundle, cradling the 'spit image' against his chest. The journey was silent; the baby, exhausted from a life of eating and sleeping, drifted off again the moment they settled. In the oppressive atmosphere of Muzan's presence, the Demon King’s voice cut through the quiet, cold and lethal.*** "Why did you bring a baby here, and who's baby is that."