We are both in our sixties and have been married for forty years. Over the last few years our sex life has waned and part of this is due to my inability to sustain an erection long enough to satisfy my wife. After sex she usually uses a vibrator to satisfy herself. During our married life we have discussed each others fantasies and I know one of hers is to fucked by a big black cock and she states she fantasies about this when using her vibrator. We recently had a holiday in Morocco where we hired a beach-side villa from a friend. Whilst this had a shared pool it also had a hot tub which was private and non of the villa was overlooked. We had been there for about four days and each day we walked out of our villa straight onto the beach. Every day we had been approached by men and women selling wares and these ranged from tobacco to clothing and each time we politely declined. One of these sellers was a well built African called 'Michael' who was in his forties and spoke perfect English. We had exchanged pleasantries and on one occasion he had sat with us to show my wife the wraps he was selling. My wife had taken a particular interest in him and on one occasion when she had had a few drinks the conversation became quite personal and turned to sex. On returning to our villa I asked her if she would like to fuck him and she replied 'I wouldn't be so lucky'. The following day we were again on the beach and Michael approached and sat next to my wife and they began discussing his merchandise. I excused myself and went for a swim but from a distance I could see that she had put her hand up the kaftan he was wearing and he had his hand on her crotch. As I approached they parted but it was obvious the effect she had had on him as there was a massive bulge in his clothing which he attempted to hide by adjusting his position. My wife said that she was interested in buying a wrap and that Michael had agreed to come to our villa later so that she could try them on. When we left the beach I asked her what she planned and she told me that Michael had an enormous cock and she was determined to get him to fuck her. I realised I was to have no say in this but I was intrigued to see how this would develop. At the agreed time Michael arrived and sure enough my wife tried on the wraps and bought three. I could see my wife and Michael were expectant of something to happen and my wife broke the ice by stating that they should use the hot-tub. Michael stated that he had no swim wear and my wife said that we should skinny-dip and she removed her clothing and climbed into the tub. Michael looked at me and I said okay and with that he pulled his kaftan over his head and joined my wife in the tub. When he removed his kaftan I was shocked by the size of his penis, although I had seen many big cocks in porn movies, none of them compared with Michael's massive uncut cock. I joined them in the tub and I saw Michael looking at my small five inch cock and my wife made some comment which they both laughed at. They had sat opposite each other and it was obvious they were using their feet to stimulate each others sex. Michael was now satisfied that I was not going to object and the situation getting openly sexual. In order to see how it would develop I got out of the tub with the excuse of getting drinks I watched from an overlooking window. They now moved together and when Michael stood up I could see that my wife had her hand around his cock which she guided to her mouth. I could now see the full extent of Michael's cock which had to be at least ten inches and twice the size of mine which in itself was fully erect. I returned to the hot tubs with the drinks but they hardly noticed me as they were so engrossed. They eventually parted and both left the tub and my wife noticed my erect cock and pointed it out to Michael and they both laughed. After drying ourselves off we all went to the bedroom and my wife asked me to get lubricant and also the poppers we occasionally use when we have anal sex. On returning to the bedroom Michael was knelt between my wife's legs licking her vagina and I had a clear view of his massive cock and balls hanging down between his arse. The head of his cock was partly protruding from his foreskin and a long thin stream of precum was hanging down. He had massive balls which seemed to be full of sperm waiting to erupt in my wife. My wife now knelt on the bed and asked me to oil up Michael's cock and he offered it to me and seemed to enjoy it as I applied the oil mixed with his precum all over his cock. I now watched as he placed his monster cock at my wife's pussy lips. She told him to go slowly but as he pushed forward my wife cried out and told him to pull out as she was in discomfort. She asked for the popper bottle and I applied it to her nose and she took five or six long snorts and indicated for Michael to go ahead. Michael now carefully pushed in and as the poppers had relaxed her she was able to fully take him in. I was amazed that she could take so much and I now realised why I had been unable to satisfy her for so long. Michael now built up a steady rhythm and my wife was in ecstasy as she cried out and encouraged him to pump her hard. Michael indicated that I should squeeze his balls and I knelt behind him and grasped his ball sack rolling them between my fingers. They both indicated they were near to coming and I gave my wife another sniff of the poppers and this drove her over the edge. As she climaxed she drove herself back onto Michael's cock and now had the whole 10-11 inches buried in her. I now moved behind Michael and squeezed his pulsing balls and saw his arse muscles contract a dozen times as he emptied himself into my wife's vagina. They lay there for several minutes before he eventually pulled his semi hard cock from my wife. Her vagina was red raw and she made no attempt to close her legs. Michael's sperm was oozing out like a waterfall and gathered in a pool on the bed. Michael looked at my erect cock and indicated said that I should fuck my wife and she said "why not try sloppy seconds". I moved towards her rubbing my cock in the oozing spunk. My wife realised that neither of us would get any satisfaction from fucking her enlarged vagina so said "put it in my bum". I quickly entered her and felt Michael squeezing my balls as I pumped back and forth. Once again my wife used the poppers and after a short time I shot my load deep into her arse. As I withdrew she said she had not cum and Michael offered to fuck her again. I said she would not be able to take his cock in her arse as he was to big but she said as I had lubricated she was willing to try. The sight of me fucking my wife's arse had obviously aroused Michael as he was fully erect and as my wife's arsehole was already open he pushed into her. She gasped but pushed back onto him until he was fully embedded and she said' fuck me hard'. My wife soon climaxed and her bum contractions had the same effect on Michael and he shot his spunk deep into my wife's rectum. After he pulled out my wife said that was the best fuck she had ever had and she kissed Michael and held onto his cock. She said that this was the first time she had had an uncircumcised cock and now realised what she had been missing all these years. We all showered and had a few drinks before Michael left with a promise to come again. For the rest of the holiday my wife enjoyed several sessions with Michael and since returning home our sex life has improved probably due in part to my wife's realised fantasy.