We were on a lovely tropical beach walking hand in hand taking in the last of the day's sun, the water lapping over onto the beach just enough to wet our feet. After about 15 to 20 minutes the beach curved to the left quite sharply and half way round was a beautiful small alcove surrounded by large rocks, in the middle the sea had left a pool of water and a mini beach, it was beautiful. We both had been thinking and dreaming of having sex outdoors for a long time and we thought this was the place as we hadn't seen a soul the whole time we had been walking. We both took our clothes off and layed down, the sand was so warm and soft against our skin, I put my arm under her neck, not just to give her support but mainly I could play with her left breast, and with my mouth on her right breast, my other hand was free to play with her moist pussy and god how wet it was, I could feel the juices flowing out when I slid two fingers inside and my thumb gently rubbed her clit. It didn't take long before she had her first orgasm and she soaked my hand with her pussy juice, I took my fingers out and we both licked and sucked them dry, it tasted devine, she then leaned foreward and slid my cock into her mouth and flicked her tongue all down the shaft, god I was in heaven. Then all of a sudden, we heard the bark of a dog and a mans voice calling it to come back, obviously to no avail, I tensed but she was not going to let go, if anything her mouth tightened even more around my cock, she was obviously in the moment. After about two or three minutes we had both forgot about the dog and its owner, until suddenly even though I had my eyes shut, I could sense a shadow and as I opened them I could see a man standing at our feet, I tried to pull her nearer to me so I could at least hide some of her body from his view, but really what was the point, he had had a glorious view of her breasts hanging and her wet pussy as she had her legs splayed open quite wide. He had obviously been there longer than I had originally thought as I could see something between his legs screaming to get out of his shorts and knowing how horny she was, I knew she had noticed it too. Now knowing that another fantasy of ours was to have sex with a third person, I turned her head towards mine and just looking into her eyes, I knew she was wanting this, so I gave her a small nod of my head and that was all she needed. She moved towards him and pulled him closer, obviously with no resistance from him (lets face it, who would)she pulled his shorts down to his feet,his cock sprang out and smacked against her face,I was looking and thinking he was bigger than me both length and girth, so I knew she was going to really enjoy this. She began by sliding the whole length into her sweet mouth without even gagging at all and put both hands round behind him and pulled him into her even more, with that, I slid two fingers into her pussy and one into her arse, a bit warily at first but she pushed her body backwards so she could get more I didn't hesitate to oblige. After a few moments of this she lay on her back and begged him to shove his large throbbing cock into her pussy and to fuck her hard. He leant over her and thrust it right in which made her throw her head back and groan, she then pulled me closer and put my cock in her mouth, she was being fucked hard, both pussy and mouth I had never heard her moan and groan like it before, and god it really turned me on, so much so that it didn't take long for me to cum and for the first time, she never wasted a drop, I then felt both their bodies tense and they both came together, the cry that came from her mouth would have made anyone think she was being murdered. When he finally pulled out of her, I could see it was soaked in both their juices and without batting an eye she rammed it back into her mouth and licked and sucked on it as if her life depended on it, she was now getting the taste of all three of us. When it was all clean, she threw herself back down to lay on her back all the while licking her lips and moaning. Without another word being spoken, he got his shorts, pulled them on, turned, whistled for his dog and walked away leaving both of us sweaty, exhausted but very very happy.