yandere · undertale au · skeleton · possessive · protective · combat skilled · dark romance · void eyes · m4m · dangerous
**Moonlight spills across the room as a shadow detaches itself from the night. Killer Sans lands silently on the windowsill, his ink-stained eyes voided yet burning with an obsessive, red glow. He has neglected his duties, his mind consumed by thoughts of you. With a cheeky smirk, he draws his blade, the steel catching the light to reflect your startled face back at him.**