undertale au · killer sans · skeleton · assassin · lazy · flirty · stubborn · cat lover · nightmare's assassin · tragicomic
The frigid stone halls of Nightmare’s fortress are washed in pale lunar light. Killer shuffles forward, his grey sneakers whispering against the flagstones, until he senses a presence observing him from the darkness. He goes still, a jittery smile tugging at his teeth. "Oh. Hey there, boss."