My wife Reena asked me if I had ever thought about swinging. I was shocked that she had raised the question and wondered was she cheating on me. I told her I had and she asked why I had never asked her about it. I told her because I thought it would upset her. " Do you want to try it," she asked. I was again suspicious, but answered that I did and had she something in mind. Reena logged onto her laptop and showed me a swingers site. There was loads of couples and singles. I immediately spotted a single woman that got my cock pulsing and not just because she was posing nude. But this was for a swap and we needed a couple. My wife scrolled down the page and stopped at a couple. I must admit the woman looked great and very sexy. The man didn't look bad either. Then I read the add. They seemed ideal for our first try and I clicked on the other photos. Then I see what had attracted my wife. It might have been something to do with his thick ten inch cock. I knew it was ten inches as he had a ruler held next to it in one of the photos. It dwarfed my seven inches and thicker, "Can we," Reena asked. A few minutes later my wife was talking to Ben asking questions and telling him about us. Then she made a date for next Saturday evening. I was excited, but also apprehensive. What if Reena enjoyed that cock so much that she wouldn't want to come back to mine. I struggled all week as thoughts flashed in and out my mind. Also the thought of Karen, Ben's wife, fucking me, gave me several unwanted and badly timed erections. Saturday afternoon Reena took a long hot bath and used all the hot water. I had luke warm water to shave in. Then she dressed in a brand new red and black basque, red panties, self supporting stockings and her sexy black dress. She looked good enough to eat. I had a roll neck sweater under my suit. jacket. We met them in a bar as previously agreed. They seemed very nice and Karen, although a little quiet, was quite sexy. I could see that Reena was gagging to get fucked by Ben. He suggested that we moved to their house. In the lounge he sat on the sofa with Reena as Karen poured us some wine. Then she sat with me on the other sofa. Ben pressed a button on a remote control and the lights dimmed and music started. He turned to Reena and started to kiss her. I took Ben's lead and started to kiss Karen. She allowed me, but wasn't as enthused as her husband obviously was. Karen broke our kiss in time for me to see Ben's hand up Karen's dress. He was fingering her pussy. I didn't know it yet, but he already had his fingers under Reena's panties and in her pussy. God he was quick. In some ways I hope he also comes so quickly. I went back to kissing Karen and slid my hand up her skirt. She jumped as my fingers reached her panty clad pussy. Then I sensed movement and broke our kiss. Ben was leading Reena out of the room and upstairs. I hadn't been prepared for this. I had expected to all be in the same room. Karen surprised me as her hand landed on my cock through my trousers and gave it a squeeze. Thoughts of Reena left me for a few minutes. Karen suddenly broke away and then led my up the stairs. I thought that she was taking me to the same bedroom and that we would be back as a foursome again. No, she took me to an empty bedroom. This time she was kissing me and her hand was down my trousers fondling my cock and balls. I wasn't idle as I now had her tits out and was sucking on them ans my hands worked on getting her panties down. They were now around her knees and I had fingers in her pussy. Then we heard a loud yelp. I wondered what the hell Ben had done to Reena and pulled away and dashed to the room it had come from. As I burst through the door I saw Reena on top of Ben with half of that massive cock buried in her pussy. Ben saw me and said, "Come in. Your just in time to see Reena take her first ten inch cock. Reena eyes were shut tight as she slowly raised and lowered herself onto his cock, taking a little more each time. There was still a good three inches of fat cock not in her yet. Reena was panting like a woman giving birth every time she engulfed his cock. Karen was now stood behind me stroking my hard cock. My trousers and pants were now around my knees as Karen stroked my stiff cock. I had a hand behind me in her pussy fingering her. She was whispering into my ear, "See how his cock is turning your wife's pussy inside out when he comes out and how her pussy disappears into her own body as he buries it in her. Reena had less than an inch to go and was gasping between her panting. Then she let out the largest squeal I had ever heard her make and she sat down full on his cock and collapsed on top of Ben shaking from head to toe. She was having the biggest orgasm I had ever witnessed her having and they hadn't really started fucking yet! Ben allowed Reena to recover before her started to help lift her and then drop her onto his massive cock. She was again panting, but also groaning between the panting. Her face was contorted as she seemed to be concentrating on what was happening to her pussy. Karen pulled away and got in front of me and steered my hard cock between her legs and pussy. As I gently pumped I could feel my cock running up and down her crack. Karen was also groaning. Then she moved a little and my next thrust buried my cock half way into Karen's pussy. She groaned loudly as it slipped in. Then as Reena rose and fell on Ben I matched their pace with my thrusts in and out of Karen's pussy. Her knees were already beginning to tremble as I thrust into her pussy. Reena squealed loudly again and then collapsed again onto Ben. She had cum again and Ben looked far from finished. Then Karen started to really shake and I had to hold her up as I fucked into her. She was holding onto the door post and was slowly slipping down. I managed to hold her up long enough for me to join her and pump my cum deep into her pussy. I lowered Karen gently to the floor. Reena was starting to rise and fall again. I moved closer to watch Ben's cock appearing and disappearing in and out of Reena's pussy. I was shocked and amazed at how so much cock could force it's way into my wife's small pussy. Reena was building again towards an orgasm. Her legs were twitching and her head was shaking from side to side as she moaned and groaned. Ben was helping to hold Reena up as she took his full length in and out her pussy. The she came yet again and collapsed. This time Ben didn't wait for Reena to recover. He rolled her off of himself and onto her back, and then he was on top of Reena taking aim. Then I watched as he slid the full length into her in one slow action. Reena squealed again as he hit bottom. Ben was now slowly pounding his full length slowly but deeply into Reena's stretched pussy. She was gasping and groaning. Ben was speeding up and Reena was thrashing around and looking like a rag doll as Ben got faster and faster. Then he was plowing the hell out of my wife's fanny. Then as Reena again squealed, Ben thrust hard and held his cock deep in Reena's pussy as his cock pumped his come deep into my wife. Then it was Ben's turn to collapse. Karen had recovered and was now sat next to me on the side of the bed stroking my limp cock. As much as I had enjoyed fucking Karen, all I really wanted to do right now was get Reena home safely and see that she was alright. I started to dress her. As I slipped her panties on I could see Ben's cum trickling out of her still gaping pussy. I feared that It might never full close again. Once dressed we said our goodbyes and left. It was a quiet long drive home. Indoors I poured Reena her second bath of the day and helped her into it. Then after washing her all over I helped her out and dried her and then put her in bed. She was soon fast asleep. I couldn't get the images of Karen, as|I fucked her, and even more the images of Ben's massive cock in my wife's pussy out of my head. Next morning, Reena complained her pussy was extremely sore and I found some soothing cream and gently rub some on and in her pussy. My fears were unfounded as Reena's pussy had closed back to normal. It was almost a week before Reena allowed me to play and fuck her as she had been so sore. Afterwards as we lay cuddling she told me that she had loved Ben's cock, but wouldn't want and couldn't take one that big again very often. She asked had I enjoyed Karen. I told her I had, but was worried for her as I thought that Ben's monster cock would do her permanent damage. Reena just laughed. It was nearly a year before we swapped again with Ben and Karen, and a further twice more after that. Reena says it is the most fabulous yet painful thing she has ever felt, but wouldn't like to see him any more frequent than what we have. We swapped with several other couples where the man was either blessed with a cock my size or smaller. We were still seeing other couples until February this year. We look forward to getting back to some normality.