One of my phone clients was really into this. In his fantasy, he and his girlfriend are a power-couple. They both make a very good living, and they have a high-end, Manhattan condo. All of the employees (the doormen, concierges, porters, maids, fitness center attendants, and cooks) know that she has been giving him the horns, bringing home other men at odd times during the week when he is out. They snicker amongst themselves, but never say a word to him. She begins an affair with a maried couple upstairs.
The husband and wife are both medical professionals. The husband is on the condo board, or head of the HOA or something. He is eventually invited to dine in their unit, and while there, all is revealed with cackling laughter as the soundtrack. He is bound and gagged, and forced to watch his girlfriend in sexual play with both husband and wife. At some point, he is sodomized. At some point his girlfriend is mid-coitus with either the husband or the wife, who castrates him, and cauterizes the wounds. His penis remains in tact, but will never work again.
Sometimes, in the fantasy, they did not always castrate him. Sometimes they would just tell him they would, and make menacing gestures with a scalpel. Sometimes they would go as far as to split his sac open, and even prick his testes with pins, yet never remove them.
If the fantasy progressed to castration, the fantasy would continue with him exploring his shoe fetish more deeply, never again able to get an erection from it, and doomed to frustrated arousal. He is forever forced to thank his girlfriend's lovers, and to tell them that he needs for them to please her sexually, because his balls have been removed. He prepares her for sexual encounters by taking her shopping for sexy clothes, lingerie, and especially shoes. She wears his favorite shoes only for other lovers now. He bathes her, and goes down on her to get her ready. When she is done, he eats the cream pies. Sometimes he fluffs her lovers. Sometimes one of her lovers is his best friend from college.
