I never knew that my sister was this kind of girl. Then again, I did not know that I was that kind of girl either. Then, out of nowhere, I got this s...trong urge to ask her something. Do you want to do it together, you know, in front of each other? It was one of those things you say without really know the eventualities of the statement. I thought that she might refuse and I would be embarrassed. But, I could see the contentment in her eyes. Wondering what I had gotten myself into, we both. Oh yeah he replies, you?. Fuck yeah I reply. I allow Marks ass get used to my cock, as I gently move in and out, I know Im close, but I know if I do long strokes, the feeling subsides. I want this to last as long as possible. I pull out, turn him around, and push myself back into his ass. I can see his face, I lean in to kiss him. Our lips touch, his are warm, his tongue meets mine, his hips undulating over my cock. I move slowly, concentrating on Marks orgasm. I remove the condom from his. All three of us were frozen until I stood up, went over to my best friends dad, and began undoing his pants. "what are you doing!?" he asked. I just continued. why shouldn't he get to join the fun? soon I had his pants around his ankles and his big hard cock in my mouth. Tiana came over and started helping me get her dad to cum. Im not sure why but I really wanted to taste his cum. "I'm gonna cum!" he said, so I began moving faster until he squirted his load into my mouth I swallowed. Just a normal stage of development.But we didn't outgrow it.We had been best friends for years. Years of snickering and sly whispering behind our backs. Years of petty harassment by teachers and Morality Monitors. Opposite-sex friendship in adolescence inevitably leads to illicit sex, don't you know? And: hey, lookit them dirty perverts!When we finally did become lovers, it was almost by accident. The details of hetero sex may be whispered in lavatories and are the material of dirty jokes, but.