Used to write reader-commissioned "erotica" short stories, of the fetish variety. There were very few requests I turned down; one of them was a story about an anthropomorphic mouse girl who was chained to a refrigerator in a junkyard, where the townsfolk would come down there, laugh at her, then piss and/or shit on her. The customer wanted this written in excruciating detail and, moreover, wanted it written from the mouse girl's POV. Easiest $300, then $400, then $500 I've ever said no to. Finally told the guy I wasn't negotiating, I was just flat-out not gonna write that shit.
What's the weirdest/most shady thing you've ever found out about someone you were dating and/or fucking?