My partner and I had been together for eight years when this happened. I was a little over thirty and Sandra was thirty two. Four times a year Sandra along with her boss and three other managers from our company would go to our sister company for a week long meeting. Sandra was the only female in the five person team. I had worked for the same company since leaving school and was a little aggrieved as I held the same position in the company as Sandra and suspected that they were playing the equality thing as one of the men was black and Sandra was obviously female. Anyway I was on my own again for the week. I bumped into Emma who was the wife of Sandra's boss. She also worked for the same company. After exchanging greetings and talking about being alone again I asked her if she would like to go out for dinner that night. She agreed and we made that arrangements for me to collect her from her house at 07:30 that evening. The day flew past and I was soon home getting changed for the evening. I net with Emma as agreed and drove us to a cosy country pub that I knew did good food. The food was good as always and we sat talking afterwards, mainly about the company as neither of us had any kids. I discovered that we had something else besides the company in common and that was going on long walks. At the end of the evening as I dropped Emma back home I suggested that we compare maps of walks we had been on. Emma quickly gave me a peck of a kiss on my cheek and as she got out the car turned and said that we could do that the following evening at her house and she would cook us a meal. I agreed and as she entered her house safely I drove off home. The following evening I was at her door at the agreed time with a bottle of red wine and some maps. Emma let me in to the lovely smell of food. She had me uncork the wine whilst she dished up the food. She was a good cook and we soon packed the plates etc into their dish washer and went back to the table with our maps. I had been topping up our glasses fairly regularly and Emma had opened a second bottle. We talked about the different places we had walked when in a sudden outburst Emma blurted out, "You know that my husband is fucking Sandra." I was shocked by her outburst, but not the content as I had suspicions that Sandra had been unfaithful. Whilst I had no proof, it turned out that Emma had what she thought was evidence. She had a pair of her husbands boxers with some lipstick on that he had on one of his trips and another time she found a pair of panties in a pocket of his jacket after another trip. She showed me that panties and boxers. The lipstick was of similar colour to those used by Sandra, but the panties were the definite proof as Sandra sometimes wore a bra of exactly the same material. I had always thought it was just a bra, buy was obviously part of a matching set. On telling Emma I asked her what she intended to do about it. She replied in action as she slipped under the table and started to unzip my trousers and then took my cock into her mouth and started to suck on it. Wow she was good and at that moment I didn't care if she was only doing it to get even. She was sure hitting all the right spots as far as I was concerned. I reached down and took Emma's tits out of her bra and over the top of her dress. They were a good size, somewhere between a 36 and a 38D. Large dark areola surrounded the thick hard nipples. I was enjoying the sucking and rolling her nipples around when she stood and took my hand and led me upstairs to her bedroom. I enjoyed seeing her tits sway along with her arse as we ascended the stairs. Once in the bedroom she was quick in pulling the dress up and over her head and discarding it on the floor. Her tits were dangled over the rucked up bra. I just had to pull her to me and suck one of those thick nipples into my mouth. Emma groaned loudly as I sucked first one then the other nipple. I slid a hand down over her flat stomach and into the top of her blue silk panties, over the patch of soft pubic hair and into her wet pussy. Rubbing first over her large clitoris before sinking deep into her pussy. Now Emma was really moaning and telling me not to stop and that it was just right. I had no intentions of stopping, in fact I was already anticipating what position to fuck her in. Emma's legs started to tremble and give way and I quickly lifted her off the floor and lay her on her bed. She was groaning as she came down from what was to be the first of many orgasms that night. As she lay there with her tits still hanging out I went for her panties and eased them down and off. It was the first sighting of her heart shaped pubic patch and her glistening pussy that was already very wet. I just had to have a taste and soon had my face buried between her thighs sampling her sweet pussy. She smelt good and tasted even better as I licked and sucked her clit and pussy. It wasn't long before Emma came a second time giving me a a small gush of her juices to excite me further. At this point I was still fully dressed with the exception of my stiff cock poking out of my trousers. As Emma recovered from her orgasm I quickly undressed. I lifted both of Emma's feet up and placed one on each shoulder, and as I lined my cock up with her pussy, I heard Emma mutter, "Oh my god. I need this." At that point I slowly sunk my cock into her pussy and continued pushing until I was balls deep. I heard Emma gasp as she expelled her breath as I hit bottom. Then she gulped a lung full of air and groaned, "Yes fuck me, do me good." I wasn't about to disappoint her, besides I was enjoying this and had no intentions of stopping. I fucked Emma with long hard thrusts until she shook all over with her third orgasm. It was my turn now as I increased speed and hammered her pussy until I sank into her balls deep and blasted several strings of cum deep into her pussy. I collapsed on top of Emma as the sensations washed over me. It was a little while before we moved and my now lip cock slipped from her soaked pussy. It was now that Emma told me that she was not taking precautions and it would serve her husband right if she got pregnant. That concerned me quite a lot and asked what she would do if she were pregnant and she told me that she would make the bastard bring it up without knowing it wasn't his. I was a little happier knowing that she wasn't looking for my involvement in raising a child. I suggested the morning after pill and she just said no way. As we lay there Emma reached for my limp cock and was stroking it. It was too soon after coming for it to get hard again and I think Emma knew that as she bent down and took it into her mouth again. I lay with the glow from the fucking still washing over me as the new sensations of Emma's sucking joined them. She was good and it wasn't too much longer before my cock was rising again. I was playing with those tits again as she sucked me. Then I was fully hard and Emma pulled away and bent herself into the doggy position. I was on top of fer sliding my cock into her from behind as I reached around for a handful of one of her lovely tits whilst my other hand was rubbing her pussy and clit. Emma was groaning loudly with each thrust. Then she was trembling again with yet another orgasm. She collapsed flat on the bed and I went forward with her and managed to maintain penetration of her pussy. I continued to bang away at her willing pussy until I was about to cum. I started to withdraw my cock what she told me in no uncertain terms that she wanted me to cum in her again. I was a bit apprehensive, but needed to come somewhere, so I gave in and pumped a second load in her unprotected pussy. Later as we cuddled up under the duvet she asked what was I going to do about Sandra. I told her that I didn't want to loose her but she had to be punished. She told me that she had no intention of leaving or loosing her husband and that what we had was just some fun. Well that fun continued in the morning as we fucked before I went home to get ready for work and the following three nights. When Sandra got home I managed to get a rummage through her laundry before she got them through the washing machine. There was spunk in one of her pairs of used panties and several tops still smelt of aftershave. After we had made love and were laid quietly in bed, I asked her how the week had gone. She told me little and just said it was good. I shocked her when I asked how the shagging had gone. Of course she denied cheating on me until I showed her the still soiled panties with dried cum in them. Sandra started to tell me it was a one off when I produced the other pair of panties that Emma had found in her husbands luggage. Sandra went very quiet for a few moment. Then she started to tell all that she had been sleeping with her boss from the very first trip. Then she shocked me when she told me that things had moved on and the last trip she had slept with three of the four men and all at the same time. As she relayed that they had gang banged her in her bosses room, I had turned her onto her front and across my legs and was slapping her arse. To my amazement she was enjoying the slapping and was pushing her arse up to greet my hand as it slapped down. The description of what they did to her and her pushing her arse onto my hand had me hard as iron in no time. As the account came to an end I climbed on top and slammed my cock deep into her glowing arse. I had aimed for her pussy, but had missed. Sandra didn't seem to mind so I continued to slam her anus until I came deep in her arse. Afterwards Sandra told me that if she was going to get fucked like that after her trip she couldn't wait for the next one. I didn't tell her but nor could I wait to see Emma again. This arrangement went of for almost four years before Emma got promoted to a different department and the trips stopped. In that time she told me that she not only fucked her boss, some of her work mates, but also several strangers either she or her boss picked up in the hotel. Even now she has no idea about my times with Emma. Fortunately Emma never did get pregnant, either she was infertile or she lied about contraception as we never did use any while I was with her. I also moved on to another company and it is me that now travels with my work whilst Sandra stays at home.