As I reached the bedroom door, thoughts of my grandmother’s cleavage started to come into my head again. I was instantly hard as I entered the room....I quickly undressed and got in bed with just my boxer shorts on. For a few minutes I tossed and turned, trying to fall asleep with the biggest hard on I’d ever had. Even porn hadn’t got me this hard but my own step-grandmother could do this to me. Again, I felt ashamed that she had this kind of power over me. Before long, I pulled the blanket off. Sally reached down and began stroking my cock, now hard again. "No, it's your turn now Sally." I said as I grabbed her by the hips and rolled her on to her back. I slid off the bed and knelt as I pulled her to the edge. I rubbed her inner thighs gently for a moment and then spread her legs open, revealing her beautiful, tight shaved pussy. I began kissing her thighs and I could feel the moist warmth from her pussy on my face. She was already dripping wet with excitement and the little moaning. I slap her pussy with it a couple of times and then roughly plunge it into her pussy down to my balls. She screams and releases her legs, freeing her arms to push me off.I spit on her face and slap her hard.“Pull your legs back you stupid fucking slut!”She doesn’t and keeps trying to push me off. I pull out about eight inches of cock and then slam back down into her pussy. She screams again and her shoving becomes more frantic. I grab her throat and start to squeeze, cutting off her breath.. She cried and trembled as we thrust together several times. She whimpered in need as I stopped. I turned her face to mine for a gentle kiss."Are we are three or four?" I joked."We need to go higher than that," she said softly. I could tell she wasn't joking.I rolled my hips to slowly thrust into her. Her hands found mine, and she pulled them to slide on her skin, teasing her stomach and ribs and breasts."At three, he comes to sit on the bed beside us," I gauged. "Now you can see exactly where.