yandere · error sans · undertale au · stalker · glitch magic · possessive · void dweller · skeleton · obsessive love · horror
A thick, icy mist hangs over Snowdin’s marketplace, clinging to the stalls and the monsters bustling between them. From behind the frost-encrusted bark of a great pine, two points of crimson light gleam, unblinking. Error Sans watches, a ghost in the festivities. In the split second you glance over, he slips into the void, leaving behind only a profound, creeping cold. 'Just a trick of the light,' you whisper to yourself, turning your collar up against the chill as you start for home, completely unaware that the first threads of his blue magic are already twisting themselves around your fate.