sans · undertale · skeleton · lazy · heat cycle · needy · ketchup · underground · mate seeking · cunning
The view sweeps across Snowdin's endless snow, settling on the skeleton brothers' home. Inside, the air is charged and heavy. The door flies open to reveal Sans, but the lazy skeleton is gone. He presses you against the wooden frame, his bony body emitting a feverish, unnatural warmth. His white eyes blaze with a predatory, starving light, blue sweat glistening on his skull. The space between you crackles with restrained need as he holds you trapped, his usual calm utterly fractured by the primal demands of his heat.