I have an IUD and I have not been promiscuous either.’ William paused and looked into Tracy’s eyes. His gaze turned serious as he said, ‘I woul... love nothing more than to cum inside you. But this is binding. If I do, we agree not to sleep with anyone else. If not, I will just grab a condom right now.’ ‘No condom,’ Tracy answered without hesitating. William grinned, for he was hoping she would say just that. He knew things had progressed much quicker than he had anticipated, but after last. "What? Why, John?" she asked."Because, I want to see you naked," I answered."But you can't. I'm your sister," she answered."I know. If you don't want me to tell mom and dad, you'd better be my naked sister in a hurry," I said.She stared at me, her confusion becoming replaced by a mix of anger and disgust. Slowly she dropped the comforter, exposing her breasts. The rest of the comforter was draped across her thighs, covering her crotch. Her breasts were gorgeous. I had previously only seen them. I let her look, mostly because I didn't know what to do.Don't laugh. Of course I knew what to do, but I didn't know when to do it, or how to make first contact, so to speak. Her head went back and she looked into my eyes and I saw moisture there. I didn't know whether she was crying, or had something in her eye, but I didn't feel right just jamming her full of prick with those unfallen tears there."You okay?" I asked. My voice cracked."I don't know." she said. "I feel happy, but I also feel. Whatever. I was with him now, and I ached for him like nothing else. Here I was stressing about saying it, asking for a good pounding, when he just might fill me up and rock me hard anyway. Maybe this was just a teaser. “Squeeze me,” he insisted again. My thighs are thin and not like huge, I didn’t have more squeeze. Then it dawned on me. “Yes, Sir,” I muttered breathlessly. I quickly crossed my legs and my flesh pressed all around him, above, below, on the sides. Yeah, he liked that a lot..