Lying on my back, I was completely exposed before the intruder. The intruder didn’t say a word but the breathing increased, erratic in nature and lo...der now. I heard the unmistakable sticky wet sound of furious masturbating. Whoever was with me, watching me lying naked and helpless, seemed to be about to beat themselves to death! It had to be Greg, his hand around his stiff cock, pre-cum soaking the length of his manhood, his hand working it into sticky white clumps that move up and down his. Now His one hand pressing her navel and other hand moving from neck to boobs. Slowly he moved his hand from navel area to the knot of her skirt and removed it. Now her pubic area is visible and he is slowly pinching her there. Whenever he is pinching my sister moving he lips more deeper in his mouth. He moved his hand inside skirt and i dont know what he did inside her skirt she completely lied on him. I think he is rubbing her pussy at that time. By seeing all this scene i became too horny and. "Truth." "Do you want to have sex with a girl?" Well, naturally." I paused. "Truth or dare?" Dare." I dare you to touch my cock." Love to." She placed her hand around it. "Oh my god, I can’t believe you have such a monster." She stroked it a few times and said, "Let’s play something else. We can call this game," she paused and gave me a devious look, "you do anything you want to me and we see what happens… Want to play?" "Yes." I could not then, as I cannot now, even begin to describe how. "Please..." I moan. But unable to bring myself to ask yet."Please what? What do you want? Ask me. I'll do it if you ask." he smiles wickedly, but immediately stops his ministrations.I'm ashamed to admit it. In a small voice I reply, "Please... in my ass. Stretch me open. Make me scream. I want to feel you cum deep in me. Just fuck me, PLEASE!"He walks me to the bedroom, removing clothing as we go. Climbing onto the bed, he positions me on all fours. A flick of his wrist and he pours cool lube.