It was mid August and my son would soon be going off to college. We had been having sex for about 5 months. I was going to miss my son and the sex but I knew he needed to do this for his future. Many of his friends were also going off to college and he was going to miss them. He asked me if he could have an end of the summer party for all of them as one last chance to get together. Even though my Dad had past away my Mom still owned a lake house about an hour away from where we lived. It was on the water and had a pool as well. I suggested that as a place to have it and he said it was a great idea. Everyone would meet there on Saturday and stay the night going home on Sunday.
I went shopping for all the food and stuff we would need for the weekend and he and I drove up early Saturday morning. After putting everything away I checked out the pool to make sure things were working. It looked great and was a hot day. I decided to get into my swimsuit and get some sun. It was a black string bikini that I bought special to drive the young boys crazy. My son told me I looked smoking hot and the guys would think so too. I went down to the pool, which overlooked the lake to pick out a good spot moving my lounger. I started on my stomach and decided to undo my top to minimize tan lines. I set it aside next to the lounger. My son came over and began to rub suntan oil on my back without me even asking. It felt really good to feel his strong hands massaging the oil in.
I rolled on my back and told him to do my front. He poured some oil on his hands and massaged that into my 36D breasts. He was very familiar with them by now having access to them almost every night. It felt so sexy to have him do this outside. I wondered if anyone could see us from the lake. At some point he undid the side strings on my bikini bottoms. He pulled them off easily and rubbed the oil into my bald pussy. I opened my legs exposing my swelling lips and clit. He soon dropped his suit and I saw how hard he was. The lounge was big enough and strong enough to hold our combined weight. He moved on top of me and getting oily himself. He was kissing me when I felt his big cock start to slide between my lips. It was oily but still a tight fit. He pushed forward impaling me. I sighed and arched my back at the feeling.
As he started to stroke I whispered in his ear that it was risky this weekend and not to cum in my pussy, I might get pregnant. He nodded and continued to stroke. We had gotten very good at this. Our bodies were in tune with each other. I loved fucking my son and would miss the frequency. Oh he would visit home and I would go see him, but it just wouldn't be as often. He pulled out for a moment and rolled me over. He put it right back in taking my breath away. His cock was so big, even after 5 months of getting used to it I was still stretched. I was letting him have his way with me but I was a little nervous he wouldn't heed my warning. I turned around and told him I wanted to be fucked in the ass. We had done this a couple of times and I knew he loved it. He asked me if I was sure and I said just do it and hurry.
He slowly pulled his big cock out of my pussy. He rubbed it on my ass getting some more oil on it. He place the big head on my rosebud and pushed. I have to be really horny to enjoy anal sex and at this moment I was. I pushed back into it as I slowly opened for him. This was always an adventure especially with a cock the size of his. His big head eased inside me and he stopped letting me adjust to it. I felt a little pain but I wanted him inside me. Slowly he pushed in as my ass swallowed more and more of his shaft. He groaned and said how tight and hot it was. He took about a dozen stroked and soon was buried balls deep in me. It felt like his cock was in my throat. He started to stoke faster now and I knew he wasn't going to last long in my tight hole.
I was pushing back onto his cock just as hard as he was shoving it in me. This was raw fucking like two animals. We were both groaning and growling and were covered in sweat and oil. His big balls were slapping my pussy lips. My clit was on fire and I exploded with an orgasm. Just as I did he began to unload deep inside my ass. It was a big one that went on and on. He cried out as he finished inside me. We were both out of breath as he pulled free of me. As I rolled over I looked past him to the lake. I saw a couple of boats that had stopped near our dock. I guess they had been watching us because when my son stood up they started cheering and whistling. I rolled my eyes and we both laughed. I grabbed my suit and headed for the pool.