It was just a short walk from Waterloo station to the address we had been given in the block of flats, just before I rang the bell I asked Mel for the final time if she was positive that she wanted to go through with what she had been suggesting for the best part of six months. She reached for my hand and said that even though she was really nervous we had come this far and she was not going to chicken out at the last minute. The door was opened by a man who said that he was the security, we quickly stepped inside and he introduced us to Summer, an attractive blond who was the party hostess. We could already hear the obvious sounds of sexual activity coming from some of the rooms. Summer led us into the kitchen where we gave her the fee that we had agreed when I first phoned her earlier in the week. She offered us a drink and Mel accepted a large glass of white wine before taking us on a brief tour of the flat. As well as the kitchen there were two large bedrooms, two bathrooms and a large lounge, looking into the bedrooms we saw that both double beds were in use, one had two women having sex with a group of four men and in the other room another younger woman was on her hands and knees servicing two men, one was fucking her while she was sucking the cock of the other. Mel and I stood in the doorway watching for several minutes until Summer suggested that we should get ready and handed Mel a dressing gown and me a large towel. We went into a vacant bathroom and after a quick shower together we returned to the kitchen and handed Summer our clothes who said that she would take good care of them. Mel helped herself to another glass of wine, when Summer came back she took us to the lounge where there were eight or nine semi naked men seated on chairs or sofas around the room. a naked girl was sitting crossed leg on the floor in front of one of the sofas giving one man a blowjob while wanking the cock of another sitting next to him. Summer told the men in the room that it was their lucky day because today there was a special guest and introduced Mel, she told them that Mel was there because she wanted to experience a gang bang and said that she hoped that they would not disappoint her. Mel untied the belt on her dressing gown and pulled it open. Mel is nearly thirty five but she has a figure that most twenty year old women would envy, she admits that she had gained a few pounds since we were married and she still has a great pair of firm tits, she had even shaved her pussy especially for this event. Summer told us that as soon as one of the bedrooms was empty she would let us know unless Mel would like to use the lounge, Mel had always been a bit of an exhibitionist and I saw a feint smile come on her face, she dropped the gown onto the floor and walked naked across the room to a young man sitting on one of the chairs. she pulled his towel open and began to massage his cock and balls, as soon as she got his cock hard enough she bent down and sucked it into her mouth, Mel is a very accomplished cock sucker and in less than a minute the man started to shake and held Mel's head in his hands as he cried out and ejaculated into her mouth. Mel spat his semen into her hand then wiped it on his towel. Watching Mel being such a slut was one of the most exciting things that I had ever seen and my cock was fully erect, before coming to the party Mel had agreed that I was also free to fuck one or more of the girls if I wanted to, in fact she said that she would very much like to see me fucking another woman. Mel had seen a young black man sitting on a sofa and walked over to him picking up a condom from a selection on the coffee table in the middle of the room. After blowing him for a short time she rolled the condom onto his cock which contrary to popular belief was no bigger than most of the other cocks that were on display in the room. Mel was on her knees on the sofa and the black man stood behind her and guided his cock into her holding onto her hips. I thought that he was being a little too rough as he was fucking her but Mel certainly seemed to be enjoying his cock inside her and I think that she had her first orgasm. The black man pulled out of her and went to the bathroom. Summer had been standing nearby and asked Mel if she would like to use one of the bedrooms which was now free, Mel walked to the bedroom followed by four or five men. Even though I wanted to watch Mel I decided to leave her alone with Summer safely watching over her. I sat on one of the sofas and I was joined by one of the naked girls that had been in the bedrooms, she was very pretty, slim with long blond hair with an East European accent, she asked me if I was happy with the fact that my wife was being fucked by many strangers. I explained that we had been planning this day for weeks, I loved Mel very much and knew that all this was just sex, I would far rather let Mel experience her fantasy than risk her having an affair which might develop into something more serious and damaging. The girl understood and asked what about me, she had her hand under my towel and was running her fingers along my cock. She asked if I would like to fuck her, I told her that I would very much like to fuck her but later, she said OK but when I was ready to come and look for her. I could hear the familiar sounds that Mel made while fucking so I decided it was time to go to the bedroom........... I will finish the final part soon...