Jimmy was a master of delaying my orgasm. While he was sucking me, he cradled my balls in the palm of his hand, keeping his thumb pressed hard at the ...ase of my cock. Even so, I was so beyond caring and so close to exploding that it was almost painful. Something told me that if I didn't take control, he wouldn't let me cum if he could keep me from spewing. He was enjoying sucking my hard young dick. I grabbed the back of his head and thrust all the way in and down his throat. He let go of my. And although we had repeatedly spoken at length in preparation for this evening, we knew that talking about it now – though it might be stimulating – might also jinx the occasion. Plus, the mental images that we were likely both having might have been just as stimulating. We had discussed it enough and we both knew it was time to put our plan into action. Therefore, we both sat silently watching the car lights and dark landscape pass as we drove.There were so many inappropriate thoughts going. ...''''suck my cock please, i wont say a word to anyone''''comon you clean it all so good its gonna taste nice i promess''he look down at me, his cock right on my lipse, his clean big mushroom head''open for me ''i felt him poke between my lipse, i open and look up at him pushing it half in''ohhhhhhhhhh yessss , dude dont be shy, i love this''getting out , looking at me breath''omg your so nice, open up ''and i was feeling his hands on my head , helping me down on him slowly in and out leaving. Well, not quite sterile. He has a very low sperm count. My mother just wasn't getting pregnant so being the swingers my parents and Sam's parents are, Sam's father took care of the job getting my mom pregnant with me."Now it was time for Steve to say, "Wow. You and Sam are half-sisters and second cousins."His nymphet looked at him very seriously. "It's a deep, dark family secret. You can't tell," she said to Steve.Steve hugged her tightly and told her that would be their secret."So that's why.