I'm trying to remember/find a story which was about a guy who was blackmailed into a chemical castration. I seem to remember he was with a girl who was slightly underage and her older brother caught them then threatened him with revealing it and going to jail. Instead the guy submitted to chemical injections which progressively robbed him of his erections as he was used by the older brother. Does this ring a bell with anyone editing the stories our can anyone tell me the title and/or author? I'd really like to find this story or similar stories about blackmail or revenge with forced chemical castration.