This happened some years ago in our early marriage years. My buddy Bob was a single cute guy that we spent some time with and there was usually some flirting back and forth between Bob and my wife. I kidded her about wanting to fuck him which she didn't deny but we were married. A group of friends went on a weekend camping trip, my wife and I were staying with Bob in his dad's rv, we were all getting pretty drunk around the campfire when I said I was turning in, and my wife followed. We were in a twin bed directly across from Bob in his twin bed. We were in bed, I pretty much passed out and woke up to Bob and my wife making out inches from me. She knew I was awake but he didn't, he flopped onto his bed and I told her to go for it if she wanted to. She slipped over to his bed, about 2 feet away and started making out slowly working her way south. Bob and I went through school together and I knew he had a big dick but she was about to find out. She got down to suck him off and I heard her gasp a little but she got after it. After a while I could hear him moaning and he rolled her under him and slipped into her pussy. Before long they were in a rhythm and she was taking all of him because I could hear his balls slapping her ass. They fucked for what seemed like an hour before I heard him emptying his wad inside her. He rolled off and passed out, she came back to our bed where I was hard as a rock and slipped into her stretched soaked pussy from behind and emptied another load into her in short order. We must have all passed out and woke up naked in the morning which was awkward but we got through it. There were more episodes after that but that's another story