My story began when I persuaded a girl who was far prettier and sexier than I had ever had before to go out with me, when we were both young students. I soon got a glow from being complemented by other guys on how pretty and sexy my gf was, and I used to get hard watching her dance at club nights while I stood with a *****. Other guys would dance close with her and I got off on asking her about them when we fucked later. She told me she could feel their hard cocks rubbing against her. When we later moved in together, things got kinkier. We got married after a year or so, but less than a year later she agreed to look for another lover on AdultFriendFinder, and after posting an ad she chose a guy. We arranged to meet him in a club in our local town, and I remember passing him, recognising his face as we walked through the club. He and her then spent the evening chatting at a table over ****** while I stood at the bar and just felt lost. I texted her to ask if she was ok and she messaged back saying: "Yes! Really good thank u. Dancing next! Love you." I watched then slow-dance together for a while, as they got closer, then I saw them kiss for the first time and I felt sick. It was a weirdly exciting feeling. After a while she texted me again and said: "Get a taxi". I went outside, leaving my wife of less than a year in a club with a guy she barely knew. Once I had hailed a taxi I went back in and they were kissing and heading in my direction. When we got to the taxi I got in the front and they got in the back together. I don't know whether the taxi driver ever realised what was happening but Alex, our bull, said something that sort of made it clear that I was her husband. We got out at our house in a village a few miles away and thankfully it was late and the bar opposite had closed, otherwise a lot of people who knew us could have seen what was happening. I left them together on the front step while I went around the back to let them in. Then I disappeared for a while for a short walk so they could have some time alone together and get comfortable. When I came back and peered through the window he had stripped her and was on top of her on our sofa - they hadn't even made it to the bedroom. I sneaked in quietly but they saw me. My wife led him up to our bedroom and I followed. I was allowed to sit in the corner but told to be quiet. They spent the rest of the night making love, sometimes slowly and sensuously, sometimes with her riding him, and sometimes with him just hammering her into the mattress. He was a much bigger, stronger guy than me. Eventually, about 2am, they curled up together and slept, leaving me in the corner, although he couldn't leave her alone and woke her again during the night to fuck her again. I left them in peace to be together alone during the rest of the night. Eventually, from my place on the sofa I heard them stirring in the morning and took another walk to clear my head and give them some time alone to come down. When I returned my wife's car had gone and I started to panic, but five minutes later she had returned. She told me she had dropped him at the local train station to head back to London. We went back in the house and I masturbated while she told me details of the bits I hadn't seen them do together. It was incredible. And amazingly, after a long time apart, we had kept each other's contact details and a couple of years ago he visited again at our new house and spent the best part of a day fucking her again while I was made to watch.