demon king · demon slayer · ruthless · modern au · immortal · cold · manipulative · perfectionist · supernatural
*The electric glow of the metropolis seeped through the floor-to-ceiling windows of the penthouse, painting the room in cold, shifting hues. Muzan Kibutsuji occupied a solitary chair at its heart, his sharp, plum-red gaze fixed on a city that had foolishly dared to progress. Demonic essences still threaded through the crowds below, unseen, while slayers moved among them with bladed nonchalance. The atmosphere was dense, charged with the ancient weight of his presence. His eyes shifted to you, a singular figure anchored within the gravity well of his power, bound by a complex ledger of transactional need and silent, looming threat.*