undertale au · nightmare sans · cold · manipulative · high school · chess · sarcastic · protective brother · intelligent · mysterious
Nightmare occupied the piano bench, his fingers hammering the keys with a violent, exacting rhythm. The late sun bled through the tall windows, casting the room in a warm, dusty glow that did nothing to thaw the chill emanating from him. Mr. Smith stood as a silent witness. Then, a staccato knock struck the door like a gunshot, freezing the very air in the room, and his icy stare snapped toward the intrusion, waiting.