I was pretty sure my wife Shona was cheating on me. I hadn't caught her or anything like that, but just little things were giving her away. She was 32 at the time and I was two years older. I wouldn't have really minded, as we had in our late twenties experimented and had two swapping sessions with two different couples, but I was upset with her cheating. I thought both swapping sessions went well and I thoroughly enjoyed them. Shona on the other hand called a halt to it after the second session. I later found out that the man had forced his cock up Shona's arse and she hated it and it had caused her a lot of pain and problems afterwards. So as you can see it wasn't the fact she was sleeping with other men that bothered me it was the secretive bit. I bought a miniature IP camera and installed it in our lounge in a hollowed out book. Even knowing it was there I struggled to see it. At work, in my office, I left my home laptop monitoring it and for the first few days nothing happened other than Shona getting the kids ready for school and taking them, and her having coffee with Hailey one of her friends. Then on the third day I knew something was up when she appeared in the lounge wearing a short haired blond wig, a very tight blouse, and from the look no bra that showed the full outline and nipples of her breasts. She also wore a very short skirt I hadn't see before. She looked like a slutty school girl. My cock started to grow. Then I hear the ring on the front door and shortly she re-entered the lounge with a man I had not seen before. It wasn't long before his hands were in her blouse playing with her tits and then she was pulled to the sofa where he sat and pulled her across his knees and lifted her skirt. No panties. Then he proceeded to slap her arse several times quite hard. I could hear her squeal and groan, she looked like she was enjoying it. It wasn't something we had ever done. Then when he had enough slapping her arse, he bent her over the sofa and dropped his trousers and fucked my wife's red arse quite relentlessly until he came in her from behind. Then he straightened his clothes and left Shona sprawled half naked on the sofa. I was left sat at my desk with a stiff hard cock. I had enjoyed the show, but not the deceit. On getting home I asked Shona how her day was. she answered much the same as every other day. I knew it wasn't. That night in bed I grabbed her arse as I climbed between her legs. I see her wince just a little. Obviously her arse was a little sore from her spanking. I fucked her long and hard thinking about the stranger fucking her on the sofa. I continued monitoring the house and it was exactly one week later when I see her again in a wig. This time a black one that was formed into two small bunches out each side. Again a tight blouse and the same skirt. I assumed her friend was coming to the house again. I was wrong when she answered the door and returned to the lounge it was with a different man. He too slapped her arse and then had her suck his cock before giving her a good fucking on the sofa. This time I wanked myself off whilst watching her. That night again I gave her another good fucking. The third week was more of the same. It appeared that she was seeing different men ever Wednesday. I again wanked myself off watching her getting a good fucking from her man. I started wondering if she was prostituting herself, but there was no evidence of any extra money. I again fucked her silly that night. On the Saturday she left me with the kids as they waited for her parents to collect them for the day. Shona went shopping with Hailey who had collected her. Once the house was empty I sought out her clothes and found four different wigs and five blouses and the one skirt in one of her drawers. I then looked at her laptop. I was password protected and as I knew one of her passwords,I had to try several variations until I found her latest one and got access. It took a while but I eventually found the web site she had signed up to and her personal add. It read that she was a bad girl that needed spanking. I read it and looked at the photos posed in her wigs, blouses and the skirt. I was hard in seconds reading that my wife wanted strangers to come and smack her arse then fuck her. I looked at the replies, there were hundreds. I must say looking at her add I would have answered her request and turned up to fuck her. Then on entering her emails, I found she had emailed one call Rick and read her latest email with him. He was coming this Wednesday to smack her arse and fuck her. I just knew I had to watch. Wednesday I was sat at my desk wanking as Rick slapped her arse for a good ten minutes before he had her suck his cock. This time she wasn't put on the sofa and fucked he held her face as he cum in her mouth. Then he had her suck his cock back to full hardness. Then he dragged her off upstairs and I lost vision of them. I finished wanking and shut the laptop down. Again that night I asked how her day had gone and again I got a similar reply. I fucked her silly again only imagining what Rick had done with her. I noticed that she had changed the bed that day and knew why. The following day I ordered another IP camera. Fortunately it came before Wednesday and had time to set it up in the bedroom hidden in a fluffy toy that hung on a wardrobe door. On the Wednesday she was back in her blond wig, blouse and skirt. Yet another different man arrived. She again got spanked and then they disappeared upstairs. I switched feeds and watched as they entered the bedroom. He dropped his trousers and fished his cock out. As Shona took it in her hands I realized it was a big cock, probably about ten inches in length and definitely much thicker than mine as he pushed it into Shona's mouth. For some reason the sound wasn't working and I had to go through several menu pages to turn it on. When I got back to them He was fucking the daylights out of my wife with his monster cock. This went of for a good fifteen minutes and I had cum in my own hand long before they had finished. I cleaned up and went back to working. That night Shona rejected my advances saying she was too tired. Too sore more like I thought to myself. I had the chance of another look on her emails and she had arranged for a man called George to come the following Wednesday. I got an instant hard on. Again dressed as a slutty schoolgirl she answered the door not just to a man, but also a woman. George had brought a woman with him. Shona was soon over his lap and the woman was hitting Shona with a paddle on her arse and I could hear Shona yelping with each blow. Then they were on their way upstairs. I found them entering the bedroom. Shona was laid on the bed and the woman was between Shona's legs sucking on her fanny and the man was face fucking my wife. Then there was a change around and Shone was sucking the woman as the man fucked Shona's pussy from behind. I hadn't heard her come in but my secretary had entered my room and was watching me wanking and had a view of the actions on the screen. She knew Shona and obviously realized that I was watching and wanking at my wife being fucked and sucking an other woman. The first thing I knew was Carol getting under my desk and taking my cock into her mouth. I had always fancied Carol, but I had kept a professional relationship with her until now, and other than our two swaps had never cheated on Shona. I came just about the same time as Shona did and the man fucking her. Carol licked me clean and zipped my cock back away. Later we talked about what had happened. I told her that I had been watching Shona for about two months and she was getting spanked and fucked every Wednesday. This was the first week with more than just one person. Carol told me she had enjoyed sucking me. From then on each week as Shone was getting fucked Carol would suck me off. She always swallowed my loads. A year and a half into this, two men arrived at our house, and after Shona got a good smacking they were taking turns at either face fucking her or fucking her pussy. It was so sexy I stopped carol from sucking me and bent her over my desk and pulled her panties down and off and fucked her in time with whichever man was fucking Shona. Carol was the first to cum followed by myself. We watched as the men took turns and lasted a further twenty minutes. Carol and I straightened ourselves and went back to work. I spotted that Carol's panties were in my waste bin and put them in my pocket, as Carol had already gone home, not wanting the cleaner finding them. It was no surprise that Shona refused my advances that night after the fucking she had received. She did suck me off though. Two days later when I got home Shone did not look happy and after the kids were in bed she presented me with Carol's panties, she had found them in my pocket. I had forgotten all about them. "And who are these?" she demanded. I owned up that they were Carol's. Shona started to cry until I told her that we had watched her being fucked by two men in our bedroom just two days before. The tears dried up immediately and she looked angry. "So your spying on me?" she snapped at me. I told her that I had been watching her every Wednesday for the last two years. Shona suddenly went very quiet and looked like she might really cry. "So are you going to divorce me?" she asked. She was relieved when I told her that I had no intentions of divorce and that I enjoyed watching her getting fucked. I asked why she hadn't told me about it. She said she was embarrassed and scared that I would reject her. Then she asked me about Carol and I told her this was the first time I had ever fucked her although she had sucked my cock every week for a year and a half. She asked did I love Carol. I told her no and that I loved her, Carol was just some fun as I watched her have her fun. Carol was just a fuck buddy and she loved her husband. I asked why so many different men. She answered that way none of them would get attached to her and she wouldn't fall for any of them. We eventually agreed that this was no worse than the wife swapping we had done, other than Shona keeping it from me. We agreed we could continue as we had been. I asked about the spanking. She told me that she knew she was about to be naughty so she took her punishment first. I told her that she didn't need punishment as I now knew and approved. From then on every Wednesday, Shona would have a different man whilst I would get sucked and fuck Carol over my desk. This went on for two years until Carol told me she and her husband were about to try for a baby so either I would have to wear a condom or just get sucked off. It lasted this way for three months till Carol announced that she was pregnant. For six months I was able to fuck Carol bareback again until she left to have the baby. I told Shona and she had decided that she had been wanting to stop for a while but had said nothing as it would ruin my fun. She suggested swapping again and we did for a year or so, but eventually decided we just needed each other. I told her if she changed her mind, I wanted to know and perhaps watch. That was six years ago and to my knowledge she has remained faithful ever since as have I. Shona had been a virgin when we married and after that she had in my calculations slept with well over three hundred different men. The only other man she fucked more than once was Rick who she see three times and the man with the huge cock four times. She had also made love with seven women. I miss those days and Carol. By the way she had a boy and then later a girl. But at least we have each other and lots of great memories.