We (Phil, Jennie)are in our sixties, we'd never swung with anyone but as we enjoyed our sex and Jennie is a very attractive lady who has had a few blokes trying to get into her knickers, we were both very curious, Jennie wondering what it would be like to have another bloke's cock, me wondering what it would be like to see her with another fella. So, we'd been thinking for some time we'd like to swop with a sexy good looking couple, try it just once, see if we liked it, so when the young thirties couple, Greg and Sue, in the next caravan talked us into joining them on a secluded nudist beach a few miles from the camp site, we both said 'yes' telling each other it would be a bit of fun, not saying anything but both of us thinking it might lead to our first swinging experience. Greg was tall, good looking, a musician in a rock band, shoulder length hair, while Sue was very attractive, we'd only ever seen her in t-shirts and mini skirts. As for us, we're both slim, good looking couple and Jennie was nicely tanned so we reckoned we wouldn't look too much out of place. They were right about the seclusion, a 100 feet walk down a cliff face to get to the beach, hidden by the cliffs and rocks. We put up the umberella and laid out the towels, Greg and Sue undressing immediately, me and Jennie taking it all in, Sue had a landing strip while Greg's package was very impressive, his member was off duty but he must have been a good 8 inches, dangling in front of Jennie, she couldn't take her eyes off it, obviously wondering what length it grew to when fully erected. Jennie took off her bikini top but kept her pants on while I dropped my trunks, Greg and Sue taking a long look at my standard issue package and looking very underwhelmed. Then we laid out in the sun for an hour or so before Greg got up and told us he was going for a swim, Sue joining him, Jennie and me deciding to stay laid out, not saying anything, watching them splash about in the sea, Jennie eventually speaking, "he's a big fella, isn't he? Twice your size, husband dear..." I wasn't too pleased with that, "that big is unatural, once he got up hard you wouldn't know where to put it." "I think I would, don't you worry!" "Well, you should show us, when he gets back make up to him, see how he reacts, might like it, you never know, might want to fuck you, better take off your pants, show him what you got to offer..." Jennie slid out of them, laid on her back, opened her legs, her slit, a bit hidden by her bush, now on show. A few minutes later Greg and Sue came out of the water, walking across the sand towards us, Greg's cock half erect, looking even bigger than before, standing over Jennie talking to us about how great the water was, his eyes taking in Jennie's pussy, "You didn't kill any maneating sharks with that thing of yours did you?" Jennie joked, "don't think I've ever seen one that big, it's magnificent, where do you put it all Sue?" Greg moved in under the umberella, his cock was now almost horizontal, a good 10 inches and thick, fat veins, circumcised, big purple head, "Don't think Sue has any complaints, do you darling?" Sue lent across and took the head in her mouth, gave out a long "mmmm" and released it, "No, don't think I have complaints today...you try Jennie and let us know, Greg would just love you to suck his cock..." Jennie give me a quick smile, "Phil said it was so big I wouldn't know what to do with it...well, I think I do Phil, I can't wait to get it in my mouth and suck it!" Jennie lent forward, wrapped a hand around Greg's ten inches, and brought it towards her, taking the head in her mouth, sucking deeply, her other hand fondling his balls. I sat there mesmerised, open mouth, my cock getting bigger as I took in Jennie's growing excitement as she licked and sucked Greg's full length. Sue lent forward and gave my cock a slow wank, "Think your wife is enjoying my husband's nob, think she's a bit of a slut Phil, so am I..." With that Sue took my cock in her mouth and started to give me a great blow job, the warmth of her mouth and flicking of her tongue bringing me to the edge in a few minutes. I let out a shout of ecstasy, I looked at her, she looked at me and my cock exploded, Sue shoving it further into her mouth as if to make sure no drop of cum went anywhere else. She broke away and we both got back to concentrating on Greg and Jennie, none of us saying anything as Greg pulled out of Jennie's mouth, parted her legs and slid smoothly inside Jennie's well wet pussy, Jennie letting out a noisy gasp as the full 10 icnhes disappeared all the way inside her. She wrapped her arms around his shoulders as they kissed he crashed away, Sue fingering my cock and balls as I got up hard again. It was another few minutes then Greg gave out a loud moan as he went rigid, his hips shaking as he shot four or five jets of cum deep inside Jennie's pussy. I wasn't allowed any further view of them as Sue pushed me back, took my cock in her hand and slid her pussy down on it. She rode me very quickly, "Come on, cum, cum, shoot, shoot!" I tried to hold out but gave in after three or four minutes, my cock releasing another load of sperm, Sue leaning forward to kiss me as my cum filled her up, Greg and Jennie going down to the water where, Jennie later told me, she enjoyed her first underwater fuck. The remainder of the week was one of the sexiest me and Jennie had ever had, we slipped into a pattern, taking it in turns in our caravans to cook meals, swopping with Greg and Sue mid morning, after lunch and end of the afternoon and again in the evening after our meal, Jennie very happy, "I always knew I could bed a younger fella and satisfy him...a lovely big cock and all that lovely cum and I'm in la-la land...." At the end of the week we went home, excited by our very first swinging experiences, very keen to see if we could meet up with other sexy couples like Greg and Sue.