This story started about 3 months ago; but before I tell you what happened it's probably worth giving you some background information. My name is Andy, I'm a professional engineer, 6 ft tall, 52 years old and I keep myself fit and well by cycling on a fairly regular basis. Kerry is my wife of 20 years who works as an accountant, initially part time whilst our kids were growing up but now they've left home she works full time. Kerry is 47 years old, 5ft 10, blonde and slim with a 36DD chest which she thinks are too big (although I don't!). Kerry doesn't like cycling but keeps herself fit by playing golf and going to the gym regularly. In summary we are a fairly typical couple with a fairly typical sex life (which has dropped off in the last few years). About 3 months ago Kerry came home after a round of golf and mentioned that her golf club was holding a Dinner and it would be good to go as Sue (one of her golfing friends) and her husband were planning on going and it would be good to meet them. We'd never socialised with any of Kerry's golfing friends before but I had nothing planned for that night and whilst I didn't play golf I had no problem with going so said "Ok let's go for it". About a week before the dinner Kerry reminded me that it was a "Black Tie" event and all the ladies would be in evening dresses; this was a gentle reminder to get my DJ dry cleaned and probably an excuse for Kerry to get a new dress!! Anyway the date for the Dinner soon arrived and Kerry went and had her nails and hair done in the late afternoon. I just mooched around the house not doing much really which was great and around 5pm Kerry arrived home with a few bags of stuff and immediately went up stairs shouting that she had to get ready. About an hour later I went upstairs to get changed, Kerry was in the bath still pampering herself so I just had a shave and shower before putting on my DJ. At about 6pm I shouted upstairs to Kerry that I was going to book a taxi for 6.45pm and asked if she would be ready; she quickly replied yes and said that she was on her way down now. She looked absolutely fantastic in a shoulder less black dress. The dress really made the best of her curvy figure as it pushed her large tits up and together revealing a substantial cleavage and as it finished around her calves the black sheer stockings and stiletto heels made the most of her ankles. I gave her a quick kiss and grabbed her ass at the same time...I was fairly sure she either had a g string on or no panties at all, but just as I started to explore a bit more the door bell rang, the taxi had arrived. When we arrived at the golf club I was initially a bit apprehensive about the whole evening, not because they were people I haven't met but mainly that I didn't want to spend a whole evening talking about nothing but golf! However, my apprehension was misplaced as fairly quickly I was introduced to a number of people and whilst there was some talk of golf that was not he sole subject of discussion. Perhaps more importantly fairly soon after we arrived I was introduced to Kerry's golf partner Sue and her husband George. Sue was a small but very attractive brunette with a slim figure, about 3 inches shorter than Kerry and with nowhere near the size of chest. Sue's husband, George was a bald but very smart and fit looking chap about the same age as me but a little smaller. George had never met Kerry before and from his initial comments it was obvious he was quite taken with Kerry; as were another couple, John and Penny who were friends of Sue and George. In fact, initially John and George monopolised Kerry as we stood drinking. This didn't bother me though because both Sue and Penny were very attractive ladies and great fun to talk to. Around 8.30pm we all moved from the bar area to the dining room, myself and Kerry were on a table with Sue, George, John and Penny. It was a great evening and the conversation was rarely about golf. In fact most of the time we were chatting about all manner of things. It was also at this time I noticed that Sue had a small tattoo on her left wrist; most on the time it was covered by her watch but when she picked up a glass of wine I noticed it was what looked like a small bull surrounded by a heart. Sue caught me looking at her tattoo and asked if I liked it, I said it looked rather cute and asked if it had any significance. Sue smiled at me and said yes informing me that Penny also had one and that I should ask Kerry if I wanted to know more. This intrigued me and after the dinner when I had a minute I mentioned it to Kerry; She told me that she'd asked Sue about the tattoo sometime ago when out on the golf course and was told that it meant she liked to have fun with other men. I said " do you mean she messes around?". Kerry said sort of but went on to explain that it was always at parties and George knew all about it and was always present. I asked Kerry what this really meant and was told that basically Sue liked to take part in orgies. I also asked about Penny, Kerry said she didn't know but could only assume that it meant the same thing. For the rest of the evening I tried to forget about what I'd just learnt but to be honest I found it very hard. But just as I was getting engrossed with another conversation and forgetting about Penny and Sue, Kerry came up to me and asked if I wanted to go to a Party at Sue's after the dinner. I turned things round and asked Kerry if she wanted to go; she said it might be fun and hinted that I might find out what the tattoo really meant. I immediately grabbed Kerry and said you're not thinking of taking part in an orgy are you? Kerry immediately said no not at all, but then said it might be fun to watch though if the opportunity came up. Before thinking too much I said ok, how are we going to get there. Kerry said she didn't know but would go and ask Sue and with that she disappeared. About 20 minutes later Kerry came back and said there's a few taxis booked and we're leaving in about 5 minutes, is that ok? When we were stood outside the golf club entrance there was a group of about 20 people all waiting for taxis to Sue and George's, it transpired. At this point Sue wandered up to me and Kerry and said it was really great that we were up for her party and she was sure we would enjoy it. When we got to Sue's house it was obvious the Party had been planned as drinks had all been prepared and laid out in the dining room and the lounge cleared with a few sofas around the walls. Initially people were gathered in the dining room around the drinks and myself and Kerry were just chatting to others there, mainly making small talk. After about 20 minutes Penny came up to Kerry and grabbed here arm saying come into the lounge John and George wanted to show her something. I just carried on chatting but after about another 10 minutes I excused myself and wandered into the lounge to see what was happening. At first I couldn't see Kerry as the lights were low and there was a couple dancing in the middle of the floor. The I saw Kerry sitting on a sofa next to Penny and George sitting on the arm of the sofa. I went upto Kerry and asked her how she was, I'm good she said, just watching the show. What show I asked; Penny then replied..... John is about to take Sue. What! I said. Just watch said Kerry it's really horny. As I stared at the couple in the middle of the floor I noticed it was Sue and John and as I watched more it was obvious their hands were all over each other. In fact one of Sue' tits was hanging out her dress and John hand his hand right up her dress and on her pussy, you could see her stocking tops and the fact she had no panties on. Sue also had her hands all over John, his shirt was completely unbutton showing off a very toned and hairless chest; she also had her hands down the back of his trousers which were undone and starting to fall down. I was completely gobsmacked and although I was aware Sue and Penny were into orgies I wasn't prepared for what was unfolding in front of me. The next thing I saw was John kicking off his shoes and stepping out of his trousers revealing just a bright red jock- strap with what looked like a very sizeable bulge in it; at the same time Sue was pulling his shirt off him. As I looked on John was stood with just his socks on and jock-strap, he then un zipped the back of Sues dress which immediately fell to the floor, leaving her in just black hold up stockings heels and a very low cut bra that fully exposed her tits. Putting his arms around Sue's ass John picked her up and walked straight towards us and lowered Sue onto the sofa between Kerry and Penny. Holding each of Sues legs up and apart John passed a leg to both Kerry and Penny; Penny immediately held the leg and Kerry followed suit. Just before John started to bury his tongue into Sue's shaved pussy I noticed him grin at Kerry, I didn't think anymore of this but I should of done. Within a few minutes Sue's first orgasm was hitting her and I was standing no more than three foot away from her as she held her pussy lips open for John's tongue. This carried on for another two orgasms and then John stood up and facing Kerry said " you want to get me out?" I thought Kerry would shy away but rather quietly she nodded and then with her free hand pulled the pouch of the jock-strap to one side. I really wasn't ready for what happened next, as she pulled the pouch to one side this huge semi hard cock sprang out. The first thing that struck me was that John was completely shaved but the size of the thing hit me, he was hung like a horse, It must of been 10 inches long and really thick with a massive bell end. Sue then he'd her legs open and looking over at Kerry said, "get that big cock ready for me would you?". Nobody said anything but you could tell they were wishing Kerry on, I just stared in disbelief as she raised her arm and put her hand round Johns huge cock. I remember thinking to myself she can't get her hands round it as she slowly started to wank the shaft. I don't recall Johns cock getting much longer as Kerry wanked it, but looked much wider and the bell was really swollen and glistening to the extent that it had forced the foreskin fully back. It was ready to be used. Sue the reached over and grabbed John's cock from Kerry, I almost sensed a reluctance in Kerry to let it go but she did. Sue then started to rub the bell end into her dripping pussy lips; Johns' huge cock head was forcing Sue's pussy lips apart and it didn't take long for them to appear really stretched, despite the fact that only half (if that) of the cockhead was in. Sue then held John's cock still in both hands as she used her elbows to keep her legs wide open; she then looked up to John and whispered, "drive it in". John then pushed forwards and I saw Sue's pussy stretch even more and then the cock started to disappear. John must have pushed about 6 inches into Sue then he pulled back until just his cockhead was in; then he lunged forwards until the whole shaft was in and Sue gasped. The the fucking started, slowly at first but fairly soon John was pounding Sue. After a while things slowed down, I thought they were going to stop but I was wrong. John put his arms under Sues legs and she put her arms round his neck; John then stood up with Sue still impaled on his cock and as he leant very slightly forward he started to fuck Sue really hard again. I couldn't really see much but Sue was like a rag doll as John pounded her. This didn't last too long and then Sue was lowered into the sofa next to Kerry, still with her legs splayed apart and still with John pounding her pussy. Penny then leant across and whispered to Sue, he's close where do you want it? Sue the hissed back at Penny, all over me and with that Penny pulled John's dripping cock out of Sue's pussy and started wanking it really fast. After a few moments John's cock just seemed to twitch and then this huge jet a spunk spewed out of his cockhead all over Sue' tits and even over her face. What I was not ready for was the next squirt this was even bigger than the first and I could of sworn Penny aimed it at Kerry as quite a load of it went over Kerry's face and down her cleavage. After this there were another four or five squirts but not as powerful, it was however a massive load that John had delivered. I the looked at Kerry who had a rope of spunk on her chin and several on her neck and cleavage; I thought she would flip at this but she just wiped the spunk up with her finger and then slowly put it in her mouth. Sue looked at her as she was massaging spunk into her tits and pussy and said good girl don't waste it. At this point I then glanced around the room and could see at least two other couples fucking. One lady was bent over the back of a sofa with her dress round her waist whilst she was being fucked and another was sitting on a blokes lap with her legs wide apart and dress pulled up whilst she fucked him. I couldn't believe what I was watching and was so turned on but didn't fancy fucking in front of anyone else so I said to Kerry let's go I want to fuck you. She said why don't you do it here and now? Too shy I replied, we had a bit of a discussion but left fairly quickly even though Kerry wanted to stay. In the taxi on the way home Kerry was all over me and whispering in my ear, did you see the size of John's cock, he was enormous. I asked Kerry why she did what she did and asked if she was embarrassed, she said it just seemed like the thing to do. When we got home we only got to the end of the hall as I fucked her brains out on the stairs. In the morning Kerry wanted it again and said fuck me like John fucked Sue. Who was I to refuse. A few weeks later one a Saturday evening I got a call from Kerry saying she was in the golf club bar with Sue and we had been invited round for a quick bite to eat, did I want to come? I told Kerry was busy but why didn't she go alone. Ok she said in retrospect I now know that was a mistake. But that's another story ......