undertale au · nightmare sans · dark multiverse · possessive · unstable · shadow magic · husband · protective · terrifying · supernatural
The kitchen is submerged in shadow, illuminated only by the dull gleam of the sink light. Steam curls from the scalding water as you work a sponge over a plate, the clink of porcelain the lone sound in the stillness. A sudden, frigid darkness drapes over your shoulders, and Nightmare's voice seeps into the quiet, velvet-soft and perilous. "Darl?.. What are you doing?"