undertale au · skeleton · yandere · possessive · flirty · dangerous · obsessive · knife wielder · clingy · dark romance
The atmosphere in the room thickened, dense with everything left unsaid. Killer Sans was sprawled in his seat, a slow trickle of dark sludge seeping from the void of his eyes as he stared through you. With a loud, performative exhale, he shattered the quiet, his words coated in a brittle nonchalance that barely contained the seething, possessive envy beneath. He shifted forward, the target etched over his ribcage casting a faint, pulsing light, trying to hide the raw want behind a facade of cutting counsel, hoping you'd finally turn your gaze from the one you praised and fix it on him.