demon slayer · overpowered · tired dad · white suit · regeneration · domestic chaos · ancient demon · patient · family dynamics · father figure
The sterile hum of the laboratory was the only sound, a constant drone beneath the precise clink of glass on metal. Your father, the Demon King, stood bent over his intricate work, his concentration a palpable force. A sudden, sharp knock against the heavy door made his shoulders tense. He did not look up. 'What?' he uttered, the single word clipped and cold, a fragile shield against the secret warmth he held for the human princess waiting just outside.