The pressure of my body pounding into his made him shake."Do you want me to cum with my dick in your ass?" I asked him.He didn't reply. So I thrust ha...der, this time holding his hips for leverage. It was painfully deep, and he gasped, and he hissed "Fuck!"And he immediately knew he had spoken an inappropriate word.So when I gagged him, tightly, giving his ass only a few moments to rest, he did not resist and didn't try to beg desperately with his eyes. He took the second half of his fucking. As we walked towards our towels two bikini clad babes passed us heading for the pool, of course being males Dad and I both turned and checked them out. Mom and Sue noticed and began a series of poses and asked us to check them out. We then all sat on the towels and laughed. Sue began digging through her beach bag looking for her sun block."Damm, its not here. I must have left it in our room." said Sue still rummaging in her bag."I'm going back to our room to get my sun block."said SueWith that. She left the top two buttons undone revealing just a hint of cleavage poking over the tank top she had on underneath. Her sandy blond hair was drawn back in a ponytail. The last few weeks I had really started to see how sexy she was. At 34 her body was in better shape than any of my friend's moms. Her breasts were easily a 32F. She had long tone legs and her ass had the perfect amount of fat.We had an amazing friendship for a stepmother and son. My birth mother had divorced my father when I was. I tried to fight him but he said, “Don’t resist or I’ll talk to everyone there and expose you right now. Also, I know you want this, because I saw you looking at me when you were riding your father-in-law’ big dick”. So, I stopped fighting and started kissing him. He said, “Much better, you slut sissy.” I continued kissing him and started to open his pants and play with his dick. He was not big like my father-in-law, but was fat. Then I heard my father-in-law call me; he knew that I was in the.