An idea inspired by the c and c club I have read elsewhere.

A woman I know who has a sadistic side and isn’t interested in a relationship with me and I talk freely about kinks. I open up about my castration and penectomy kinks. She is amused and a little time goes by. During this time she does research and finds a club where people bet their stuff. Men their balls and/or cock. Women their clit. She tells me about this and convinced me to go. She doesn’t bet her stuff much, but she bets mine a few times. After a few trips she puts me on a risky bet and I come out ok. She loves it so much we fuck (bare) and do so several times until we go again. She bets mine (balls, cock, or both... surprise me) and I lose. After the fact she admits having feelings for me and we begin a cuckold relationship with pegging. She’s also pregnant too.