My wife is a fairly conservative woman and we have been married for 22 years. Our sex life is OK but has been slowing down for about the past 5 years. She is still slim and very attractive and stays fit by visiting the ladies only gym. On rare occasions we would talk in bed about sexual fantasies and past sexual encounters from our younger pre marriage days. Her stories were always very tame and only ever comprised of straight sex with her boyfriend and going down on the odd cute guy when out on a date after they broke up. She surprised me one night about 10 years ago when after a few bottles of bubbly we had an early night and whilst we were in bed making out and talking about past sexual encounters she blurted out that whilst drunk one night she and her then boyfriend were giving a friend of his a ride home from the pub and they stopped at a grass land park and they all got out of the car. She said she was felling flirty and started making out with her boyfriend whilst lying on the grass and jokingly said lets all have sex, and with that her boyfriend started unbuttoning her top and exposed her breasts to his mate, she said she started to go down on her boyfriend and as she did he hitched her skirt up over her hips leaving her almost bare ass up in the air in front of the friend. Another minute more of oral sex and the boyfriend started to slip her knickers off and simply said, if you want us to have sex with you we will have to get rid of these, and she said she then kicked them off and returned her attention to her boyfriend’s cock with her ass high in the air. The friend obviously took this a green light as she said he started to caress her ass and eventually started to finger fuck her pussy until he made her cum, this in turn almost made the boyfriend cum so she lifted her head and wondered what was going to happen next, she said she felt something rubbing around her pussy lips which felt good then realised it was his cock. She said the only thought that was in her mind was oh god; he’s going to fuck me, which he did and he soon filled her with his cum, she said the boyfriend then moved into position and took his turn and fucked my now sopping wet pussy, which he later said was absolutely fantastic…..This story had me as hard as a rock and all I said to my wife was, after all these years you finally tell me that you’ve had a threesome, to which she replied, I wasn’t sure if you would like it. The love making session that followed convinced her I did like the story. Anyway, that was ten years ago and we enjoyed that story from time to time. This all leads into her 50th birthday which came up last month and in the weeks heading up to it I asked what she wanted to do to celebrate. She has had mixed emotions about turning 50, says she won’t be as desirable any more, which is nonsense of course. She eventual said she only wanted to have a few dinner parties, one with the family and then later have one with her current friends and some old friends from her younger days who she hasn’t seen for a long time. I was tasked with the invitations and I asked her who she wanted to have there and I was given a verbal list of names. I said what about the old boyfriend and she just smiled and said you would love that wouldn’t you, then said no. I said he would be surprised to see you and I bet he would be envious because you are still youthful and very attractive. A few nights later we were in bed making out and I jokingly said lets invite him, and she replied, I suppose we could, I’d like to see what he looks like now. Over the next few days the birthday dinner came up in conversations and she would cheekily mention his name and she was always aroused after we spoke about it. Anyway, I said OK lets invite him so she phoned him up and gave him the details. A few days before the dinner he phoned the house and I took the call, he said he could not come as it was a long drive and he wouldn’t enjoy a party if he couldn’t have a celebratory drink. I thought about it for a few moments and said if you like you can stay at our place and he agreed. When the wife came home and I told her she went silent and didn’t react which I took as a sign of disapproval. After dinner she relaxed with a glass of wine and the subject came up and she just smiled and said what would you really do if I suggested I have one with him for old times sake, like you have always talked about in bed. I hypothetically said that would be great but how do you arrange for something like that to happen. We went to bed as horny as hell of course and while we were having sex she said, what would you do if he was doing this to me, I said I would love to see that, she said wouldn’t you join in, I said of course and she then said, I would have to hold your hand or something while he was fucking me so we were connected. Then she said, so, if it did happen would you prefer to go first or second. That comment was so erotic it made me come straight away as it was obvious she had been thinking about it. The days went by and we both felt nervously exited about the dinner even though in reality we knew the actual likelihood of something sexual happening was remote. The day came and he arrived at the house late afternoon and my wife made the introductions and we made small talk. He was a pleasant guy and we seamed to have a fair bit in common, we had a few beers and chatted while the wife finished getting ready. I went up stairs to see where she was up to, and my god, she was standing in front of the mirror finishing off her makeup and she warring the most incredible black garter belt stockings and lacy G string and no bra. I told her how great she looked as she put on her dress. I went down stairs and said she won’t be long and we finished off our beer. We phoned the cab and we were off to the restaurant and we meet up with the rest of her friends. We had a great dinner and we all talked about the fun things in our lives as we enjoyed the wine that was flowing. My wife’s old boyfriend was a talkative guy and he got on well with everyone. He spoke to me about my wife and how she still looked like she was only 30. I mentioned that she was not looking forward to being 50 because all the naughty fun was behind her. I was bit drunk and I said to him we should show her a bit of fun tonight, she has mentioned to me a few times over the years about some of the fun you guys got up to and she’s been very conservative since then and I think she misses it. He laughed and I replied by saying I could never get her to do something like that. He said really, bet I could. A few more drinks with the crowd and the party was over and the 3 of us grabbed a cab and headed home. We got inside and I put some soft music on and poured us all a drink. We took turns at dancing with her and we had to steady her from time to time as she was bit tipsy, but I think she was putting it on so we would hold her a bit closer. The talk got around to birthday kisses, so as I was dancing with her I gave her a long passionate kiss, her ex then took her by the hand and started dancing and I went into the kitchen to get another drink and as I looked over towards them they were engaged in a long passionate kiss which was great to watch. I walked back in and said it’s my turn again and began kissing her and it was obvious she loved it all. As we danced I cheekily undid some of the buttons on the front of her dress with no objection and kissed her again and said to her ex, your turn to dance, and there’s still more buttons for you. I watched as he danced with her and he undid more buttons until her breasts were all but exposed. The atmosphere was now very erotic and I guided her back onto the couch and as I kissed her again I undid the remaining buttons and she let her dress fall open, we both began caressing her breasts and her ex then leant down and began kissing and sucking on her breast, she moaned out loud and I also kissed and sucked her other breast until her nipples were all red and poking out, She reached out and began rubbing the front of our trousers and of course we were both rock hard. I said I think we should take her upstairs and we both took her hands and walked up the stairs and into the bedroom where I kissed her and we slipped her dress off her shoulders, she looked incredible in just her stockings and garter belt. We guided her onto the bed and caressed her body some more before she undid our trousers and instructed us to take them off. I looked across and thought, shit he is big, My wife then began stroking us and I watched in amazement as she slowly began kissing his shaft, then mine, then I watched as she went down on him. What an incredible sight seeing my beautiful wife slipping her lips up and down his shaft, I ran my hand between her legs and she just moaned in pleasure as she was sliding her lips up and down on him. Then it was my turn and I could hardly stop my self from coming. We laid her back and she instinctively parted her legs for us, I gave her a little kiss on her inner thighs and she whimpered, then I ran my tongue across her clitoris and she moaned out load, I moved up and began to kiss her and her ex took position and drilled his tongue into her and quickly bought her to orgasm. We laid back and again she took turns at going down on us then she moved up and whispered softly in my ear, I want you to go second. Then she put her bum high in the air and I watched totally mesmerised as he slowly guided his shaft into my beautiful wife’s pussy and began fucking her right in front of me, oh god I thought, it was so great to see the excitement and absolute bliss on my wife’s face as she was being pleasured. I couldn’t believe something so erotic was finally happening, he began to moan and I heard my wife softly cry out, yes, yes, she grabbed my hand and he began to orgasm and I knew he was filling her with his cum. He flopped back onto the bed and my wife just stayed in her position, my cock was throbbing like crazy and I knew that any stimulation would make me cum, I moved in behind her and as I looked down ready to guide myself into her I could see the wetness of her pussy, I slipped in oh so easily and my wife buckled in pleasure as I pushed in hard and I came almost immediately. We all laid back and composed ourselves a little and I said how great was that, our friend kissed my wife and said happy birthday and went off to his room. Yes, it was a very happy birthday, and we all got a present.