Carley was a 22 year old beautiful woman that had many boyfriends. She never seemed to stick to any one man very long. The longest was Frank and he lasted just three weeks. I had known Carley all my life and it felt almost like brother and sister between us. We were talking and drinking a few beers in her garden, when I asked why her boyfriends never seemed to last very long. I was a little shocked at her reply. She told me that once she has had their cock and enjoyed it, there are many more out there to try. Being such a sexy looking woman she had no difficulty in getting her man so to speak. I asked why she had never tried anything with me. She responded saying she wanted to, but was worried that when she moved on I would be hurt and it would ruin our friendship. I told her that would never happen. I knew she had slept with many men, so sleeping with more after a fling with me would be no different. The conversation ended there. Two weeks later we went to a party and Carly hitched up with a guy and disappeared with him and I thought that she had just found a new conquest. Then she reappeared a short time later. Not long enough for a good bonk I thought. Then she came and sat with me and we talked. I asked her what happened with the guy she just met. She told me that he wasn't happy when they got outside and he got his cock out and Carly laughed, it was under three inches fully erect. I must admit I did laugh at the poor guy's predicament. He had seemed quite a nice guy. We had a few more drinks and then Carly asked if I would see her home. It was just a few streets away and I was happy to walk the short distance with Carly. When we got to her house she invited me in. "Tonight's the night," she told me. "It's time to see if we can get together and still be friends." With that she kissed me. We had kissed many times before, but this time it was a passionate kiss. To say it was good, it gave my tingles all over. Then she fondled my cock. "This had better be better than three inches," She laughed. "Wow I didn't expect that," she said as she took my seven and a half inch cock out. Carly dropped to her knees and sucked, first the head, and then most of my length into her mouth. She was just as good at sucking cock as she was at kissing. When she stopped and stood up, "come on lets go to bed," she said pulling me with her up the stairs. I had been in Carly's bedroom loads of times, but just as mates. Tonight it was different and sexy. I undressed Carly and she then undressed me. I placed Carly on her own bed and went down on her and licked and sucked for some time. I must have been hitting all the right spots as Carly was constantly moaning her delight. "Fuck me, it's time, fuck me," she ordered. I was quickly between her legs and placed my cock on her pussy mound as I got settled and prepared to enter her body. "Hurry, get it in," she ordered. Then I was lined up and pushing slowly in until I was fully home. Then as I got into a rhythm Carly was thrusting back trying to get more cock into her greedy pussy. Then I decided to turn her over into the doggy position. Carly loved it yelling at me, "Yes, yes, harder, deeper, yes, don't stop." Then she came shaking and moaning. I managed to hold off on my finale and kept on pounding her fanny. Then as she came a second time her pussy's pulsating caused me to unload my ball deep inside her fanny. "Wow that was great," Carly informed me, "why have we never done this before?" Carly went and got us some beers and we snuggled as we drunk the beer. Carly was stroking my cock. She got very excited when it began to stiffen again. Once stiff enough, Carly mounted me and rode herself to an amazing orgasm. I saw her shaking from head to toe and she pulled free from me as she continued shaking for several minutes. As she lay there shaking I finished myself off on her gorgeous tits. Later when we had recovered we snuggled down under the duvet and went to sleep. Since that night we have slept together about a dozen more times. We are still best of friends, but on odd occasions we become lovers for the night. She is still my little sister, even when she sees other men.