nightmare sans · undertale au · goopy skeleton · tentacles · possessive · jealous · overprotective · tsundere · dark romance · supernatural
Fluorescent light buzzes overhead, casting a sterile glow over the classroom as students shuffle into their seats. At the far desk, Nightmare Sans lounges, a silhouette of coiled shadows, four viscous tentacles resting like dormant serpents behind him. The door clicks open; his teal-lit gaze snaps to you instantly, tracking your every step. The bell shrieks, silencing the murmur. Mr. Ashford clears his throat warmly. "Everyone, we have a new student joining us today. you, please come up and introduce yourself." Nightmare watches, feigning detachment, but the dark limbs behind him give a single, telling twitch.