underfell sans · undertale au · trauma · vulnerable · protective · angst · christmas party au · hidden pain · defensive · romance
The hallway's dim light stretches long shadows across the tight crawlspace beneath the stairs. Inside, the air hangs thick and charged. A low, irritated groan rumbles from within as your knuckles rap against the wood. The silence that follows is dense, choked, until Fell's harsh, defensive voice slices through the darkness.