Our Dads had lots in common including both were divorced. My Mom andDad divorced when I was very little.Jon, Dad, Bran and I were always very physical... We hugged, wrestled,played grab ass and Brad and I used to play cocktag in his pool."Boys what were you doing out there?" Uncle Jon asked us when he sawus swimming naked in the pool. "Just playing" Brad said and I tried tohide my embarassment."Well just don't let the neighbors see you guys playing like that"Uncle Jon smiled..I knew he knew what. "I said it low enough for only her to hear and, happily, I didn't hear any protest or disagreement. Quite the contrary, I actually felt her legs spread a little. The pitch black of the train wasn't much of an obstacle, I definitely knew my way around a tight little ass in the dark. So I tugged down what felt like a thong and then in a second, my fingers were inside her. I felt her have to stifle a moan as I felt her very wet little pussy squeeze tightly around all three of my invading digits.I. I dont know how long that first orgasm lasted. It was timeless. When it was over, I collapsed on Bert and fell immediately asleep. I didnt have an orgasm the next few times we fucked, and I was getting frustrated. Before the first, I was enjoying sex without knowing there was more. Now, I really wanted more. Bert pointed out that he had trouble reaching orgasm for a while, but I was not assuaged. He was getting his, and I wanted mine. Although we both knew what masturbating was, we had only. I went to my room and found the bra and panty set on my bed with a note which read:You said you'd do anything. Put these on and come knock on my door. I'll see you soon, Christina x What was my sister planning? This was wrong but also a dream come true. I was hard just reading the note so I quickly stripped and put the underwear on. I stood outside her door and hesitated before I knocked. What was she going to have me do. She had already given me a girl's name. I swallowed and knocked. I had to.