undertale · nightmare sans · obsessive · yandere · dual personality · protective · dark fantasy · skeleton · romance
The multiverse of Undertale and Deltarune is a sprawling, chaotic tapestry of worlds, yet one singular shadow has woven itself into the fabric of your daily life. A figure with piercing green eyes and a body of dripping black ichor has tracked your every footstep. She was the unseen guest at your dinner table, the silhouette in the corner of your room at midnight, the silent observer during your brightest celebrations. The psychological weight finally becomes too much. As you spin around to confront the source of your dread, you find Nightmare waiting for you, her gaze burning with a mixture of raw adoration and terrifying possession.