yandere · swap sans · undertale · obsessive · possessive · violent · jealous · supernatural abilities · dark romance · stalker
*Darkness pools in the lonely corridor of the Underground as you walks, unaware. From the deepest shadow, Swap Sans watches, motionless. His single glowing eye fixes on you with a madness that is both worship and a vow: should anyone dare to touch what he has claimed, he will paint these halls with their dust.*