This occurred back last summer when my wife was staying with her father as her mother was in hospital. It had been a hot day and as it started to cool I decided to take my dog down along the river path. We had been out almost and hour when Trip took off up a track off of the path. I had been up there before and knew that there was a clearing at it's end. My wife and I had picnicked there a few times. As I approached the clearing I heard two people shouting at the dog to go away. I got my first glimpse of who was doing the shouting. It was a woman in her forties like myself and a man probably ten or so years younger. The woman was hastily putting her large tits back in the top of her dress and bra and covering her bottom half with the blanket she was sat on. The man was tucking his cock back into his trousers and zipping it in. I called Trip to come. He ignored me. I waited until they had dressed then entered the clearing and apologized to them as I put Trip on his lead and pulled him away. Back at the car I gave Trip a drink and then put him in the car. I was amused at having caught the couple in an intimate position. I wondered if they had resumed when I had left, so I crept back to take another look. At the edge of the clearing I concealed myself behind a tree. The man was on top of the woman in the missionary position banging away at her fanny. I could tell from her moans that the woman was getting excited. Her head was turning violently from side to side. I tried to get a little closer without being seen and thought that I had managed to do so. Then her eyes opened and she was looking directly at me. The man suddenly com and sprayed his load all over her stomach and fanny. The woman groaned, not the groan of coming, but the groan of disappointment. He had cum and left her high and dry. As he lay on the floor, still looking directly at me she said, "Come on, That fucker has finished and I need more. Fuck me." I stepped forward and dropped my trousers and knelt between her legs. The other man just watched as I lined my cock up and slipped it straight in to her sloppy fanny. He had done all the hard work, and with just a few thrusts she came, and then again as I Banged into her.. Then my cum was boiling and erupted deep into her fanny. I climbed off of her and thanked her. She thanked me saying that he, being the other man, always cums too soon. I could see that her fanny was covered in his cum and mine was now trickling out of her fanny. The man was back on her is seconds, licking and sucking at her, cleaning her up. She motioned for me to step forward and she sucked and licked my cock cleaning me up. The man had cleaned her, and in so doing, had managed to get hard again. She let go of my cock and got on her hands and knees. He proceeded to fuck her doggy style. She was very vocal in encouraging him to fuck her. Then he came again. She looked at me with pleading eyes. He had come too soon again for her. "Come on. Your going to have to get me off again," ordered me. I was hard so I got behind her and plunged straight back in, balls deep in a single thrust. She grunted as It hit bottom and then she was fucking my cock as I held still. She had a series of mini orgasms causing her to squeal as each one hit her and then with a final thrust onto my cock she shook as if she was having an epileptic fit and then collapsed onto the blanket. I followed her down trying to keep my cock in her. I was now on her as she laid flat on her front. I resumed thrusting into her until I came in her. I pulled out and started to redress. The man was back on her cleaning her fanny out. She had rejoined the world and rolled over on her back. She looked straight at me and thanked me again and berating the man for being a waste of flesh. I left and took Trip home. He got extra treats for finding the couple.