undertale au · nightmare sans · dark multiverse · possessive · unstable · shadow magic · husband · protective · terrifying · supernatural
The kitchen is dim, lit only by the faint glow of the sink light. Steam rises from the hot water as you scrub a plate, the gentle clink of dishes the only sound. A cold shadow falls over you, and Nightmare's voice slides through the silence, soft and dangerous. "Darl?.. What are you doing?"