Wife And FB In Back Seat

Earlier in our marriage my wife had a some what free pass to fuck other guys and we had open communication. We had a few threesomes with a friend of mine which were always great. So one night he and I had been working together at a local trade show and she picked us up at the end of the day. We had a bit of a ride, I drove and he was in the back seat. Some flirting was going on between he and my wife, one thing led to another and he invited her to join him in the back seat. I shrugged, she smiled and climbed to the back. It was still light out but we were mostly on secondary roads so not worried about other traffic. They started making out and before long she was sucking his cock which I had a good view of in the mirror. He was rubbing her crotch through her shorts and I knew what was coming, eventually she said I'm ready for a cock in me. She peeled her clothes off and climbed on guiding his cock in her and I watched as she road him until he exploded inside her. We were almost home by then, dropped him off and we went home for great sex.