This is a true story about how I found out my girlfriend Emma has been cheating on me. Me, my best mate and Emma had been drinking together and one of our friends come to pick us up. Emma and my best mate were together in the back of the car and then me and the driver had to go back to his house to meet someone. We parked up in a car park around the corner from the house and me any my friend got out the car to go in the house and left my girlfriend and the other guy in the car, because I did not think anything of it. I then rang my gf who was still in the car to tell her that it was going to take longer than we had expected and asked her to come inside the house. She was breathing kind of heavy but I still did suspect anything, and she said no shes fine waiting in the car. About 45minutes later we returned to the car and my best mate was now sitting in the front seat, and we started to drive towards my house where we going to get dropped off. Something did not seem right because both of them were very quiet and my gf was just acting strange. We then got dropped of at my house and left my mates who drove off. Emma went straight to the bedroom and I followed her there and I was feelin really horny now and started to kiss her all over. She was looking really sexy and was wearing some tight blue jeans and a very revealing short top. Before I could take her jeans off she told me that she had to tell me something. She then started telling me how sorry she was and that she had been fucked by my best mate in the back of the car. I then started shouting at her saying how could you do that, but at the same time I was really turned on as well, and she started to grip my dick and began to pull it out. While wanking me lieng on the bed she began to tell me everything that had happened. She said as soon as I had gone inside the house earlier my best mate made a move on her. He started to kiss her on her lips and she did not push him away because she said she was really drunk and was feeling wet and horny. She then started rubbing his dick and was surprised about how big and hard it was. She said his cock was the biggest she had seen and was way bigger then mine. He then pulled up my gf's top and started sucking and bitting on her tits while she was wanking him off. He then pushed her head down and made her suck his cock which she loves doing. His dick was so big she said she was choking while suckin and licking it up and down. He said he was about to cum so he pulled out and pulled jer jeans all the way down. Emma was earing a very sexy red g-string what I had brought her, and he moved it to the side and started licking her juicy little pussy and shoved his tongue as far up her pussy as he could. She said he was very good at licking her out and she was loving it. She then told me he bent her over the back seats and over his knees and began to spank her ass till it was bright red and she was groaning while he was doing this. He then shoved his dick up her pussy and began to fuck her as fast and as hard as he could, because they was worried about us coming back. He then fucked her in a couple of positions and told her he was about to cum, and she asked him to cum inside her pussy. My best mate had just came inside Emma's pussy and used her g string to wipe all the cum off his dick, she said she gave him a quick blowjob to lick the rest of the cum off. What a dirty little she is, and after she told me we had the best sex we had in months.