My wife and I are both in our late fifties, and have been married for 9 years, both of us have been married previously. Our children are now grown up and we have 2 grandchildren now.
We have a mutual friend called Jeremy, who is quite lonely. He has been looking after his aging mother now for the last 10 years or so, and he has not been with a woman in all that time to my knowledge. Carol has always felt sorry for him, but has never felt anything sexual for him, or so I thought.
Over the last few months Carol has been expressing some dissatisfaction with our sex life. Normally we have sex once a week but she would prefer 2 or 3 times a week. This has also coincided with some mild flirting with Jeremy whilst we've been out for a drink, and Jeremy made little attempt to disguise his pleasure at the attention he was receiving.
This developed into light-hearted banter between myself and Carol, and I have frequently teased her about her "admirer", and told her that given half a chance he would be in bed with her. Her response was to scoff half-embarrassed at the prospect, but then one night after the usual tease, I asked her what she would do if Jeremy made a pass at her. Her response was quite surprising in that she felt quite intrigued, and that she might enjoy close attention from him.
I was starting to feel a quite excited about the prospect of Carol and Jeremy together sexually, but said no more about it, until I was out on my own with Jeremy, at which time had a frank man-to-man chat with him. He confessed to desiring Carol, but didn't want to do anything to hurt me. When I suggested to him, that sexy fun with my consent - provided that's all it was, wouldn't hurt anyone, he was genuinely interested.