I groped a tit as she slid her hand down the back of my leg and directed my cock into her sopping, excited cunt. My whole cock had slipped all the way...in before a warning light flashed in my head. Condoms? I asked her. Im on the pill she said breathlessly. And with that she pulled her hip down as far as she could without letting my cock slide out, and then drove them upwards, slamming herself into me. I was pumping furiously, her cunt softly grabbing my cock, rubbing it, not tight , but not. I did and soon they were coated in my juices again. Go ahead and lay back on the couch a bit more so I can see better. Good, now slip one finger in. As I slipped my index finger in I flinched a bit, it was very tight but also slippery. I moved it in an out as he was telling me now and pretty soon he told me to slip another one in. I pushed my middle finger in next to the other one and gasped due to the slight pain I was feeling. He told me to finger myself a bit faster and soon the pain went. He stood in front of me and I opened my mouth like a good whore. My son was a natural. he grabbed the back of his mother,s head with both hands, and rammed his wet dick into my eager mouth. He knew exactly how his mamma liked it…hard and rough. With the taste of both my sons pre-cum, and my daughters juice in my throat, I shot another stream of cum into our new toys mouth. Okay, baby, I said, letting his cock slip out of my mouth. Go fuck Charlotte. Charlotte? Do like it good and rough like. We walked to the front steps and he stopped as I climbed the first one. "Please don't drop out of the study" he said. "What happened tonight has nothing to do with that"`I was still confused. What had happened tonight? I smiled down at him. With my heels and the advantage of the step I was actually taller than him. "Don't worry, sir" I said. "I'll still be a good subject for your study"His eyes searched my face for a moment and than he nodded and turned away.I watched as he got into.