Okay I just have to speak about this, write it down, get it off my chest.

I am a 23 year old guy, I have a sister who is 17 and she is often bringing her friends over to sleep for the night, they usually have some drink and smoke a bit of pot. Anyway, I must admit that these girls are beautiful. I consider myself alright looking and really there is not a big age difference at all and there bodies and minds are definitely sexually aware. We were all hanging out together laughing, talking and this went on for pretty much the whole night, the girl I felt most keen on would not stop glancing at me and I had an erection for most of the night checking out here tight teen body. Her name was Lana. She had nice tits, not small and not too big, her ass was TIGHT and I felt my cock dripping with juice thinking about her thighs and pussy. It was quite hard talking with her but and I really did not want my sister to think there was something going on, she would find it disgusting and probably not bring her friends over anymore if she found out what happened. So it started getting quite late and was about 2 am when we all decided to go to bed, I was burning with desire and felt so bad lying in my bed not being able to fuck Lana. I could sleep, blood was running through my body and I had really worked myself up, I got up and walked out of my room and onto the back deck of the house. I sat there for a good half an hour and convinced myself I had to let it go and go to sleep. I walked onto the yard and had a piss, As I walked back up the stairs and onto the back deck I noticed the kitchen light had been switched on, I went into the kitchen to investigate and was immediatly filled with excitment to see Lana alone, pouring herself a glass of water, She hadn't seen me yet as I had walked in from behind her, It was a hot night and all the girls where sleeping in the same room, She was wearing a small pair of knickers which rode up her ass, my god what a beautiful ass, so young and tight. Her body was amazing and she was very short and petite, On top she was wearing a bikini type bra. I made some noise and said hello. She swung around in suprise, She said Hi back and her voice crackled, she was nervous, I asked her what she was doing and she replies she was just getting some water because she couldn't sleep, I told her I also could sleep and was just sitting on the back deck. She smiled and said she felt like being outside too. We walked out the back and I let her pass me and walk out the door first, as she passed me she look me in the eye and gave a little smile, My cock went hard as a rock immediately as her almost naked body was so close as she passed. We sat down next to each other and started talking about random stuff, I could feel the sexual tension in the air and felt like jumping on her right then, I didn't know for certain if she wanted it but and thought she could just be being friendly. I told her I needed to go for a piss again and walked out onto the yard, I had just finished and was walking back up the stairs when she began walking down, She said she wanted to walk on the yard so we slowly walked through the garden to a big tree in the yard. She suprised me with the next question asking why I couldn't sleep, Right then I decided to just make a move and see how it went. "Because of you" I replied. She smiled straight away and looked at the ground. "What do you mean" she said back, "I mean you are beautiful and I couldn't stop thinking about you" She looked up at my eyes and gave a deep tension releasing breath, She moved closer and I reached down and kissed her passionately on the lips. She was hesitant at first but quickly let her self go in the passion. I asked if she had been fucked before and she told me she had done it twice with guys her own age. Well let this be your first time with a man I said and she quivered as I knelt down and pulled her panties to the ground, Her pussy was pink and I licked it immediatley, I undid her bikini top and picked her up by the thighs, She was breathing heavily and remarked she had never been with a guy with a fully grown cock. I placed her against the tree and penetrated deeply into her, she quivered again and moaned as I pulled back and began fucking her against the tree. She was very light and easy to hold up and the tree gave me support to simply pound away, She started wimpering and collapsed in my arms, I kept fucking and after a while she looked up and said she felt like she was shaking inside, I knew she was about to orgasm and she then began visibly shaking in the legs, she let out a loud cry of pleasure and collapsed back into my arms, she had squirted out onto the ground and seemed exausted, I pounded as hard as I could for what seemed like at least an hour and she would periodically orgasm and squirt. I couldn't believe how many times she would orgasm. I was filled with power and kept thrusting deep, she began to whimper again and told me she was absolutely exhausted. She asked me to stop but I simply couldn't, her tight teen body was wrapped around me and her legs felt great around my waist, I had rarely had sex and been able to go so long without cumming so I told her I was a bout to cum soon, She started groaning with small whimpers and it just turned me on more and more, I began thrusting as hard as I could and she started crying. I cummed soon after and pulled out. I carried her up to the back deck and laid her down on the couch, She looked exhausted and couldn't even speak. I went back down to the yard and grabbed her panties. When I got back she was still incapable of speaking, I helped her onto her feet and she was weak at the knees, One leg at a time I put her panties back on for her, I felt her pussy again with my hand and sucked her breasts, I walked her back inside and she should go to her bed, She said she couldn't walk so I picked her up and took her to my room. I put her on my bed and we both fell asleep. I woke up and it was about 7 am. My sister and the other girls where still asleep and so was Lana. I immediatley pulled her panties down again and penetrated from behind, she woke up and asked what I was doing, I picked her up and began thrusting in doggystyle and she simply took it untill I came. She got up and walked back to my sisters room and I haven't seen her since, My sister still doesn't know and she told me yesterday her friends will be coming over again on the weekend, I will have to wait and see if Lana is among them!