Looking for a particular impregnation story

I'm looking for a story I read several years ago and cannot seem to locate. The gist was that a happily married man and wife are coming to terms with his cuckold fantasies. They already have 2 ********, but he wants her to have another with someone else. His work sends him abroad for a year, and while he is gone his wife finally becomes promiscuous. She sends him updates on her infidelities. She ends up ******** with one or two of his friends, then getting impregnated by his former boss. I've looked through asstr and literotica and can't find this one anywhere. Does this plot ring any bells?