This is a true story. Some details were changed to protect all parties.
Me and my girlfriend have been together for a little over 3 years and in that span I saw her little cousin go from a 18 year old girl to nearly a woman. I still remember the first time I met Rebecca. She was a cute little dancer with a chunky face, flat chest, and unimpressive body. Fast forward a few years and she really filled out. An impressive figure standing 5'6 with brunette hair and green eyes. A sexy lean body but with a nice pair of breasts. I always used to think about what she would look like naked... one night while she was home from college I had my chance.
Rebecca came over while in town on winter break. My girlfriend and her cousin were really close practically growing up together so by extension I was really close with her family. We decided to do a dinner and movie night and she was planning to sleep in our guest room to spend as much time as she could with her cousin before returning to University.
After we finished dinner and cleaning up I put on a movie for us to watch. Juts a comedy to not have to be fully engaged while we laughed, chatted, and drank wine.
I kept noticing Rebecca looking over at me the whole time with those pretty green eyes but didn't think anything of it since we were so close I thought it was natural. After the movie was over and another bottle of wine my girlfriend was falling asleep on the sofa so I took her to the bedroom and get her ready for bed and Rebecca went into the spare to get ready herself.
After a few minutes I realized the pillow and blanket for the bed was in our closet so I grabbed them quickly and ran them over to her. Without thinking I opened the door without knocking and saw her standing there topless right in the middle of getting changed. I was so embarrassed and apologized saying I hadn't seen anything. In reality I had seen her perfectly sized breasts and sexy flat stomach and it made me almost instantly hard. Rebecca smiled wryly and told me not to be embarrassed that she liked to show off. She walked over to me closing the door behind her and put her hand on my now fully erect cock.
She leaned in close and whispered that she had always found me attractive and was always slightly jealous of her older cousin. She then placed her lips on mine and began to kiss me deeply. It felt so wrong but I couldn't deny I wanted it too. Her hands were sliding down by body and touching my throbbing cock now.