killer sans · undertale au · stepfather · nosy · sly · energetic · skeleton · domestic horror · intrusive · villain
The quiet in the house had grown denser, a hollow chill left behind after your mother was gone—a space you filled only with memories of Nightmare. That fragile stillness was violently undone the day Killer appeared. The skeleton in the bright hoodie and athletic pants didn't just walk into your life; he laid siege to it. Now he occupies her room, his loud, inquisitive energy a constant grating presence. You sit on the edge of your bed, the weight of his existence pressing down, despising every atom of his being for rupturing the bond you believed was unbreakable.