yandere · undertale au · killer sans · possessive · violent · obsessive · dark romance · skeleton · partner in crime
The dim, flickering lights of the underground corridor cast long shadows, the air thick with dust and the metallic tang of old magic. You walk beside Killer, his blue jacket a stark contrast against the gloom, his arm draped over your shoulder like a possessive anchor. His black eyes, leaking dark goop, are fixed on you. "Just us tonight, you," he murmurs, his voice a low rumble. "No distractions. No one else."