Just got back from a week away with the wife on the Costa del Sol to celebrate my 60th. My wife Janet is 58, blond, 40d bust and still has a shapely figure and always has a shaved smooth pussy. We have been to a few naturist beaches and she has no problem stripping off to get an all over tan. Over the years I have been on at her to have some fun with me and possibly with another man on the beach. She has always refused until this year. On our first day we went to the nudist beach at Cabopino. We found a nice secluded area in the dunes at the back of the beach. We both stripped off and lay in the sun.After about half an hour I began to get an erection thinking about Janet's big tits and her exposed pussy. She was laying there with her legs well apart showing off her shaven slit. I reached out and found one of her tits and started to play with her nipple. A thing she enjoys. A few moments later I felt her hand grab my erection and slowly wank me. After a few minutes she knelt up and took my solid prick into her mouth and sucked me, then licked my shaft before licking and sucking my balls, while I played with her tits. I looked over to our right and there was a bloke standing watching us. He was totally naked and had a large prick. I told Janet we were being watched . She glanced up and then continued to suck me. Her nipples were swollen and I knew she was sexually excited. I thought I would chance it and beckoned the bloke into our space. He sat at my feet, watching Janet while still wanking his prick. Janet stopped sucking me and told him to sit beside her. I wondered what she was going to do and to my amazement she took one of his hand and placed it on one of her tits and then she reached over and took hold of his prick. She slowly wanked him as he squeezed and played with one of her tits. His prick was about 8 inches and quite thick. I knelt up got beside her and played with her other tit, paying attention to her swollen nipple. She then used her other hand to wank me. She then started to wank the bloke faster as he was telling her to wank him. He came in several spurts over the sand. I then came in several spurts. The bloke thanked us and left. I asked Janet what had come over her suddenly wanking another man in front of me. She told me that was the first of my birthday surprises and they would get better each day on the beach. That night we had a good fuck on the balcony of our apartment. I will continue later with the next few days.