I was 15 and my sis was 18. She had been a relationship for about two years. They broke up as both were off to college and the work place. We spent a lot of time together, our parents both worked at night. One night , I jokingly asked her to teach me to kiss a girl. She said she would , but asked me never to tell anyone. I agreed. We both were on the couch , sitting side by side, I knew how to cuddle. So I put my arms around her and started to kiss her, after a few seconds , she pulled back and said to me , I thought you know how to kiss. Asking her if I did it right, she said it was more than right. In fact she said I kissed better than her old beau. She like the way I frenched her, using my tounge to work around inside her mouth. She wanted to know if I ever had sex. telling her , only a couple times , with the same girl, a neighbor of ours. She said , lets kiss again, so I held her very close and tight and we started necking. While we were kissing , she put my right hand on her boob. Knowing what to do next. I started squeezing and fondling her large breast. I slid my hand into her bra and started pinching her nipple. She started to moan a little , and slid her hand down to my now very hard errection. rubbing me and said , Baby brother you are all man down there. Unzipping my pants she took my cock out and firmly stroked me a little , I in turn slipped her tits out and started to suck and bite her nips , we both were laying down now. Still biting her tits , I slid my hand down into her panties and found her wet and warm pussy waiting to be penetrated. Using one finger , I slid into her , she got very excited . She said lets go to the bedroom. When we got along side the bed. Facing each other , we kissed long and rubbed our bodies together. Strip she told me, I got naked fast , and started tearing her clothes while I was kissing and feeling her all over. She knelt down and took my cock in both her hands and started to lick and kiss my now aching penis. She was amazed at how big I was. I pushed her onto the bed, and got in the 69 position , putting her on top . My tounge found the hot honey hole, I started to nibble on her pussy lips . She started to moan and roll all over, I held her tight , she was swallowing my hot rod . we both came to a climax , My first mouth full of love juice, it tasted good , when there was no more to eat , we both rolled on to our backs, I moved my position , as to face her . We kissed some more. She wanted me to fuck her, telling her , I really wanted to. I mounted her, lifting her legs up over my shoulders, I entered her, she said to go slow , she was tight. Easing in a little at a time, in and out. Finally I reached complete entry. Laying there , pushing it all the way to the hilt. She said okay, start pounding me. I felt as if I was a battering ram. She was tight , but damn it felt so good. She groaned and moaned and dug her fingernails into my back. We screwed for aout 10 minutes and we both said were about ready to come. Pounding even harder , I started to come, she said to come in her. I pulled out just in time , and shot a huge load all over her stomach and tits. She told me to get a mouth full my semon and kiss her. Licking her boobs I got a mouth full and gave her a big kiss. She swallowed all I gave her. My first time eating cock cum, my own. The taste was sweet and juicy. She told me she hadn't come yet. Having no rubbers, I went down her and tounged her until she exploded and almost choked me. Her legs were tight around head, I had swallow all she gave. I turn gave a big kiss and gave her back some of hot juice. Learned plenty from Sister, we did more practicing , still learning more each time. She started to take the Pill, so I could cum in her. Some nights we would sleep together , when our parents went out of town for a couple days. We would use the 69 position to start the night.