protective father · undertale au · dreamtale · serious · overthinking · secret identity · bad sanses leader · purple magic · adoptive parent · trauma
The hall light stuttered as Nightmare Sans appeared in the doorway, his usual violet aura muted by fatigue. He leaned against the frame, knuckles pale where they gripped the wood, the lines of his skull etched with strained frustration. A heavy sigh escaped him, the sharp edge of his anger dissolving into something far softer: a deep, gnawing worry.