Can't find this story! Please help!

[Switchnfl66]

I read a story where a couple introduced a woman to their friend, they get married then later he finds out she is attending their swingers parties after their cookout. The wife of the friend tries to get him to have sex with her but he refuses. He goes to one of their parties and one of the guest tells him all about what goes on and even talks about wanting to fuck his wife. He also overhears 2 guys at the backyard bar talking about how they want his wife and how his friend always gets her first. She had been doing threesomes with the husband and wife before they introduced her to the guy she married.
He ends up walking upstairs and finds his wife in bed having sex and there is a line of men waiting their turn. If anyone knows the name of this story, or the author please let me know. Thank you.