Paul and I had been close friends all our lives as had his sister Sybil and Gladys, my sister. Paul and I had been masturbating together since I was nine, and as I was to learn, Sybil and Gladys had had their own encounters. The kids in our group began socializing at parties given for them by our parents about the age of 11 or 12. At these parties which were held on Saturdays by rotation at each others' houses, we played childish games such as spin the bottle where I had my first experience of kissing girls. My first dance was with Sybil when I was about 13. We were both rather clumsy but enjoyed the experience. It was also at this party that I got my first glimpse of Sybil's tits when she leaned over and her party dress fell away from her chest, and I got a full view of her little apple sized tits which were too small for a bra. She blushed furiously, knowing well that I had seen her budding beauties. About the same time our parents began allowing us to go to the movies by ourselves, although they drove us there and later returned to pick us up. It was natural for Paul and Gladys and Sybil and I to pair off and sit together. Soon when we were at the movies, we began holding hands, and occasionally kissing. When we spent the weekends at our summer house, as our encounters got warmer, and we were left to ourselves watching TV. After our parents had gone to bed, with the lights low, I began to kiss and fondle Sybil, while Paul and Gladys were doing the same. Soon this progressed to my finally getting a hand full of Sybil's vulva through her panties. One fateful Saturday when we were walking on the beach in our swim suits we wandered off into the dunes, and began kissing. It wasn't long when I had Sybil's bottoms off, and I was vigorously fingering her love tunnel. She began my instruction in efficiently pleasuring a girl by stopping my vaginal assault, and directing my fingers to her clit. While she did this, she got my trunks off, and began stroking my raging hard penis. After about ten minutes of this we both came. Perhaps I will add to this later.