This happened when I was 18 years old and just got into university in the lower north of england (orignally locating from Glasgow). My girlfriend was very excited for me and was willing to carry on our relationship long distance because she couldn't stand being without me. She stayed in Glasgow as she was staying on for a third year to do fashion design at her college. Anyways, everything was going well and I was living in the halls of residence, sharing with 6 other students. After settling in she came to visit me for the weekend staying with me. She was quiet and timid at first meeting my new flatmates and friends at university but seemed to get on very well with one of them, "Adam". It was nice to see her getting along with them and she could have a laugh along as well. After numerous visits in the next few months everything was going well and she was coming down to visit in the evening and as normal staying for the weekend. Adam wasn't feeling too great that day and decided not to come into any of the lectures scheduled that day. The day was a normal friday, we would go out for a drink after lectures at a nearby student bar and food. Annoyingly, I forgot my wallet with my I.D and money so i put it off and returned halls to just relax until she came over. At first I went to see how Adam was. I knocked on his door a coule of times but he wasn't answering. I got slightly worried, so i rushed into my room and gathered the spare key card and opened his door to be met with a similar holdhall to her sitting on the floor, the shower was running behind the slightly closed door. I knocked the door forward to find a steamy shower glass door with two figures going at it. I noticed her wet mousy hair hitting the shower glass door as he was fucking her from behind, Her breasts hitting up against the glass. I stood there for arund 10 seconds until they noticed. witnessing her crouch down and begin to suck his cock until he noticed me standing there and pushed the shower door open. Ive never seen anyones faces drop like those two. Adam tapped her as she proceeded to carry on deep throating his cock, until she noticed something wasn't right and turned around, her hand still tightly gripped on his cock as i noticed as she moved her head. She lipped her lips and gasped. I walked straight out of there with her chasing me. There isn't a lot to say after that. Apparently she came to visit Adam frequently at his home in Newcastle without my knowlegdge and had been seeing each other since the second time they met. I obviously changed buildings of residence and the relationship was soon over immediately. They didn't carry on seeing each other and a few month after that me and Adam became civil with one and other for the sake of our friends. I do know a year after all of that she went on to see someone we use to go to school with and I considered a friend back home.