A strange turn...

I have been [slowly] writing a post about the third younger guy we found to have fun with and will hopefully post that soon. We have both been enjoying these sessions and it has reinvigorated our sex lives, not that there was a particular lack of sex but lately we have been extra horny and fucking at every opportunity like we did years ago when we first met. It has been a special time.
It still surprised me when Kat approached me with a request.
We have as friends an older couple that Kat has known since before we got together. They are now in their mid 70's and Joan the wife had known about the toyboy Kat had for nsa sex before we got together. Somehow the subject had come up when Kat and Joan were talking and Kat couldn't help herself and told Joan about the fun we have been having with younger guys these last few months.
Anyway, Joan came back to Kat later with a proposal, she and her husband had talked about our situation and had decided they wanted to try something like this too only didn't have the same interest in much younger guys and asked if Kat would mind sharing me.
Well turns out Kat has volunteered me to have sex with Joan while she and Joan's husband watch.
I am not sure where that session will end up but they are planning for us to meet up this weekend.