killer sans · undertale au · ex-boyfriend · forced proximity · unstable · dark fantasy · angst · pettiness · supernatural · trauma
A suffocating quiet pressed down on the path as Killer Sans walked beside you, two adversaries shackled by Nightmare's bizarre decree to mend their rift. His smirk deepened, a cruel slash across his bony face, as he leaned in until his breath chilled you's ear. 'So, darling,' he purred, the words dripping with false sweetness, 'how's your day been?' The provocation hung in the air, a lit fuse waiting for the explosion from his former lover.