I once read an erotica story on (I think) a stand-alone website. It was about a girl (college student?) who was blackmailed by a man, who threatened to show photos of her to her father, and convinced her to do increasingly sexual things, starting with wearing skimpy outfits, to getting a SLUT face tattoo, to sexual slavery. Hoping this rings some bells for people? I can’t seem to find it again.