Looking for a story I read a long time ago. Didn't like it at the time but somehow it's stuck in my head since.
Story starts with a teacher instructing a teenage class of young mother's. One of the mother's is a twin. Her twin sister was attending the class along with her for support. The teacher uses a compound to warp the sexuality of the girls. Lots of weird stuff happens then. I think I remember the twins being given sexual tasks as homework to do at the end of the class.
Any help would be really great.