Rebecca and I had been living together for five months when this happened. She is about 5.7", long black hair, pretty (almost innocent) face, big eyes, fabulous figure with 36-C breasts and delicious trimmed pussy. Our sex life was fantastic, she had only ever had three men before me and she said I had "awakened" her sexuality. She simply loved oral sex and we also got into bondage, role play etc...I loved watching her msturbate as described my fantasy of her being ravished by a queue of well-hung men...! In fact I started to become obsessed by wanting to see her with another man, with other men....to hear about her being unfaihful, for other people to know that she had other men... Rebecca loved the fantasy, playing along with it as she wanked or sucked me..however, I could not be sure she would actually go with another man, her experience was, at that time, still fairly limited. The big opportunity came when we went on holiday to Cyprus...we were staying in an apartment within a holiday complex with taverna, boat marina etc. We enjoyed the sun, sea and...lts of sex, Rebecca was especially horny. We visited the taverna regularly where a local man, Stavros, befriended us and helped us with ordering food etc etc, he also ran the boat hire at the marina. He was tall, muscular and charming and I knew Rebecca liked him and enjoyed his flirting. In bed we would pretend Stavros had joined us and that he was rogering Rebecca as I watched...I knew that Rebecca was more than warming to the idea. Then the fateful day....we had spent much of the afternoon in bed and Rebecca was incredibly hot as I described to her much she would enjoy Stavros... That evening she wore just a flimsy white dress, tiny white thong and white stilletos and, she had made that extra little effort with her makeup, she looked stunning. Despite already having cum twice that afternoon I was incredibly excited, and fearful, about what just might happen that evening...I both wanted it to happen but hoped it would not! We both drank a fair bit at the taverna and chatted with a two or three other English couples there and danced. Then Stavros arrived and was soon flirting with all the "wives"...and especially Rebecca. I was most proud when he selected her to dance with and they looked great on the dance floor. After they danced Rebecca told me how Stavros had pulled her to him and how he was "hard as hell!"....she was clearly very excited....and surely now up for it. Again Stavros asked Rebecca to dance and I watched, hard, as they danced closely. Rebecca put her arms around Stavros's neck as they danced and he kissed her fully as the other couples and myself watched. Then his hands were on Rebecca's shapely bottom, he lfted the hem of her dress and was gripping her bum cheeks, her pussy only covered by the tiny thong, as they snogged wantonly. "Have you seen your Rebecca?" one of the other English men said, "Yes" was all I could reply, I was almost coming watching her... I was so proud of her....the horniest woman there and being so wonderfully, publicly unfaithful. A few moments later Rebecca and Stavros came over to the table and, in front of everyone, I asked him if he would like to come to our Apartment, Rebecca just looked....horny. Moments later we were in the apartment and I watched in awe as Stavros and Rebecca kissed, open mouthed, lustily as soon as we were throug the door....it was now obviously going to happen whether I wanted it to stop or not! Stavros lifted Rebecca's dress over her head and, dressed now just in her white thong and heels, Rebecca knelt in front of him and freed his cock from his jeans...Christ it was huge! Stavros was quickly out of his clothes and he gripped Rebecca by her long, lustrous hair as she knelt before him and kissed, licked and then sucked his magnificent cock. What a site, what I'd always fantasised about, I came in my jeans without even touching my cock!! No such problem fo Stavros who allowed Rebecca to feast on huge cock before picking up up and carrying her to the bed...there he pulled the thong from her hips and buried his head between her legs..Rebecca cried out with joy as he licked her gorgeous pussy, gripping his head as she came oh so quickly... Then, the moment...Stavros moved between Rebecca's thighs and entered her, his massive cock sliding inch by inch into her willing pussy. Rebecca grippd him, almost sobbing in pleasure as Stavros fucked her, and fucked her hard. I sat by the bed, cock in hand, wanking again.. It was incredible to watch them, Rebecca was wild with lust, coming and coming on his cock..after a while I left and sat on the balcony..it was, frankly, all too much for me...just what had I allowed to happen? Finally I slept on the balcony, although I did go into the bedroom in the early hours..they were finally asleep. When I next awaoke it was almost eight a.m. and i went to make tea, but from the kitchen I could hear them...clearly fucking again. I walked into the bedroom and what a site, Rebecca on all fours, her fabuous tits beneath her swaying as Stavros vigorously fucked her from behind. Rebecca looked at me and blew a kiss even as she was being fucked. I stood there staring, by now openlly wanking and came quickly just looking at Rebecca's beautiful face, contorted by lust as he lover powered into her from behind. An hour or so later Stavros finally left and I joined Rebecca in bed, lovingly, reverently I went down on her ravaged, sopping pussy and was delighted when she came again as I licked her clitty...and, yes, I could taste Stavros's cum. We were in Cyprus for three more days and Rebecca got to spend a night with Stavros again...she was hooked, she loved it...and so did I. That trip to Cyprus was the first, but certainly not the last time I would see Rebecca in the arms of another man (I saw her with two men at a Christmas party the following year!!) but..it was the horniest. For her birthday, together with a lot of expensive lingerie, I paid for a small heart shaped tatoo on her buttocks...with the word SLUT in tiny letters inside.... She was, Rebecca had become....a slut. And I loved her for it. J