IntroductionIt was about two months ago when I found out she was seeing him behind my back. He was the boyfriend of Shaz, her friend from a small clothes boutique in town shop she worked at and become good friends with. It turned me on at first as she was coming home from work all horny, and we'd end up in bed making love. And when I confronted her about it, she didn't deny it but said, she couldn't help herself and it was because he'd made her cum with his fingers when we'd invited them around for dinner one evening, and we ended up talking about how they got into caravan swinging. One thing let to another and we were all soft playing on the sofa together.So Shaz and Dave were in their late 30's and he was a big fat bastard. But for whatever reason, Linda my wife of two years, was so turned on with what happened that night, she started an affair with him. Linda was only 22 and I was 25, our sex life was great, even though she was not very experienced and only had one serious boyfriend before me. Small and slim with tits and nipples to die for.Chapter 1- Soft play with Shaz and DaveSo they started talking about how they were in this caravan swingers club and Linda was asking them loads of questions. And after a couple of bottles of wine, she was encouraging Shaz and Dave to play by him exposing her tits and huge areola. Shaz had really large breasts, they must have been 38 or 40D, and to be perfectly honest, I'd never been into big tits, but when her boyfriend Dave had eased them out, and Linda was encouraging me to have a feel...! Well, I succumbed and had a good grope as well.But then Shaz kept saying it was Linda's turn, and because she was a bit drunk, she was giggling and let me open her blouse and ease them out. It was so fucking horny watching him feeling her up and she was encouraging me do the same to Shaz.Then Dave asked us if we had and sexy movies...? I told him we did and put one on. So we were all watching this girl getting shagged stupid with two guys in a car and as the lights were off, me and Dave were fondling Shaz and Linda who were sitting next to each other in the middle. Linda was moaning and sighing as he was caressing her tits and I was doing the same to Shaz. But then Shaz started squeezing his cock and kissing him passionately. Linda was watching and getting more and more turned on, so I moved my hand down started caressing her legs and was soon inside her jeans. I'd managed to unbutton them and pulled down the zip, my hand was inside her knickers, rubbing and fingering her as she watched Shaz squeezing his cock through his trousers. Then surprisingly, she grabbed my hand and put it on Shaz's leg...! She wanted to see me doing the same to her friend so I looked up at Dave who was smiling and nodded the OK.