LFAS: Man tells girlfriend(wife?) about colleague's big cock; she gets to sample it at a rest area gloryhole

[LustyScribe]

This was probably 10+ years ago, and I've tried the Advanced search thoroughly. Man tells his girlfriend about his friend's big cock while they are out to dinner in a nice restaurant. It culminates in him "arranging" to stop at a rest area with a glory hole, over which is hung a calendar. She ends up servicing him orally, vaginally & anally, as her boyfriend holds her on her side of the wall. Weird the crap I CAN remember, but not the damn title.