My wife and I have indulged in this lifestyle occasionally, first with some couples, and then her seeing men. But for the last few years the interest has waned and we've not really done anything. I am in my sixties and my wife is 15 years younger at 49. About two years ago we met a man, who has become a very good friend, through a mutual interest and he worked in a shop which sold 'bits' for our hobby. I won't say what it is as it is very specialist and people in the know could recognise us and especially him. When we met Ray we just stood chatting in his shop for an hour and he spent most of that time staring at her tits. She has a lovely figure and is very pretty, shoulder length blonde hair and 34D boobs. She rarely wears a bra and likes quite tight fitting clothes and her nipples are huge and stick out even when they're not hard. We joked about how he was obviously horny for her and she said that he had a sort of charm that she loved and would let him if the opportunity arose. I went away on a 3 week business trip to Asia and as we were having a few technical problems with our hobby I suggested that she popped into the shop to see Ray if she needed any advice. We communicated by phone and text when I was away. We have always been very close and best friends and still in love after 25 years married. She told me of a problem and I suggested that she ask Ray and whilst she was there he offered his phone number and told her to ring if she had a problem. . She told me that he again spent the whole time looking at her nipples but did admit that she had worn something quite provocative and found his staring very addictive. That night we talked on the phone and laughed about the way he looked at her and she said that she would be up for anything if he tried it on. I must point out that Ray is late 50s, bald and a bit overweight with a belly but not distinctly obese so I was quite surprised at her as she usually found tall hunky men more her thing. She had told me after our first meeting that she felt at ease with him and enjoyed his humour and said he had a lovely friendly smile. She rang him and he went to our house where they talked about the problem and then about everything else. He was still there 3 hours later and when he left, giving her a peck on the cheek, she told me that she had really wanted him to kiss her properly. She said that she was horny 'through the roof' and was disappointed that he had gone without anything happening as I had been away for about a week at that point. I suggested that she texted him to say how much she had enjoyed his company but just then she received a text saying that he had really enjoyed being with her and that he was available at any time for a coffee. She texted him back and said that she'd just put the kettle back on and he said he'd be there soon. He walked in the door and without saying anything he just grabbed her and kissed her. She responded and they basically ripped each other's clothes off and had 5 minute sex right there on the floor. She came twice in that time and he came once groaning very loudly. The one disappointment was the size of his cock which is only about 4 inches when hard but she said that she was so desperate she didn't care. Over time they met occasionally and they would fuck. He even stayed at ours after coming to dinner one evening and she went to him in the night. He thought that I didn't know of course. This went on for about a year and we decided that it would be better if he knew that I knew so told him that as I have got older I have trouble keeping up with her so we'd joked about getting another man in. I had suggested Ray so from that time I was aware that she was going to his room at night when he stayed, and that she was seeing him occasionally for sex when I wasn't home. After a while due to circumstances we decided that she should stop seeing him for sex and he became just a friend. He still wanted to kiss her when we met but there was nothing more than that. After about 2 months my wife said that as our circumstances had changed again then maybe she could start seeing Ray again. I said it was her decision and they again started having sex. I noticed a difference as when he came for dinner she would sit with him on the sofa and would spend most of the night in his bed. She said it was nice to have a boyfriend that she felt comfortable with. Fast forward to two weeks ago which is about 9 months from her starting again with him. I had noticed that she got very close to him when she saw him and her texts were more than just from friends having sex. I joked that she was in love with him and she admitted that she was and had been for about a year. He was quite fat . He was very hairy which she doesn't like. He had a tiny cock. But when she had sex with him she said that he could use his fingers in a way no other man had ever done and she would soak the sheets. His small cock was also not a problem as she had developed a technique where she used it to rub on her clit and just inside her where she is very sensitive. We have a scoring system that we jokingly use to tell each other how much we enjoy our sex and a score of ten is out of this world. Most of the time we get scores of 7-8 to describe the intensity of our orgasms. With Ray she often achieves an 8 but most of the time it is 9 or above and even occasionally 10. The first 10 she ever had with him or anyone, she said that she thought she would pass out but that has become a regular occurrence when she stays the night in his bed. She told me that she is in love with him and that the sex she has with him is some of the best she's ever had. Occasionally it IS the best she has ever had. We talk openly as we always have and she says that she is IN love with him but not like the love we have. He excites her and she is definitely happy with all that extra Dopamine buzzing around her system. Am I jealous? Absolutely the most jealous I have ever been in my life. But I see her happy and know that she is mine and he is only borrowing her.