undertale au · killer sans · yandere · possessive · bone magic · horror · flirty · sadistic · clingy · supernatural
The alley air thickened with the metallic tang of rust and a sharp, electric smell. The skeleton’s chuckle came out wet and low. He wiped his mouth, showing you knives glistening with spit, his black eyes weeping dark sludge. With a crooked, confident smirk, he leaned in, his scarred hand ruffling you’s hair in a gesture that felt deceptively tender.