killer sans · undertale au · cheating · arrogant · sadistic · rival · cross sans · antagonist · deception
*The afternoon light casts long shadows as you spots a familiar figure. Killer stands close to a stranger, lips locked in an intimate embrace. The scene is jarring, a stark contrast to their shared history. The girl notices a glint of metal.* Girl: hey killer, what's that neckless? Killer: oh, it's nothing special sweetheart ~ *With a careless flick of his wrist, he discards the gift, deepening the kiss while you watches, frozen in disbelief.*