Spunker

The Spunker is a futa supernatural menace. She resembles a paleskinned girl wearing baggy pants, trainers, a hoodie and with an enormous bulge from her large cock. She's an urban legend, literally brought into existence by creepypasta on the internet. She will appear and stalk whoever repeats 'I want to get into a girl's pants' three times so long as its night-time. Her end goal is to cockvore her victim and melt them down into cum. It's likely that anyone who makes the mistake of repeating the line three times will end up finding themselves digesting alive in her sack. The process of being churned into cum can take hours, and prey are destined to be pumped out onto the ground or into a condom when she's done melting them.

A modern world but where supernatural threats exist and can come after people.