She Doesn't Know She's Busted

More of a secret than a confession but here it is.

I work from home, small office space it the basement. My wife is a stay at home mom of our 2 kids, both in school during the day and while I'm in my office, my wife maintains the house and has her best friend over all the time.
We have a hot tub in an enclosed gazebo out back that she and her friend use a lot. She apparently has totally forgotten I installed a security camera out there last fall. Had an issue with neighbors feeling it was ok to use it when we weren't around.
Anyway, the camera sends me Notifications when there's motion. For the last 4 months. I've been sitting in my office watching as she and her bf go full lesbian in the hot tub with me at home in the basement office.
I admit I was pretty upset about it the first time I saw this but hey, it's not another guy right?
We do still have a great sexlife after 22 years of marriage. I want to tell her I know and it's OK as long as it's just some occasional fun but I don't want to ruin it for them and certainly don't want to ruin the chance, even slight, that I may be able to find a way to join them at some point. That would be so fun. First and only 3some I've ever had was in high school.

I do love watching them though and we have some pretty great sex later that night evertime I catch them in the tub.