Is Fantasy Better?

My wife and I have been together nearly 20 years, probably since we first met , I have always spoken about an extra cock for her and she always enjoyed the talk . Nothing has ever happened, she developed ME and was very fatigued,after covid she seems to have more energy and from about the last year, when we have sex, it's her that brings up being shared, and I say I will arrange it and her grunting back" fucking do it then " she used to say after, let's just keep it as fantasy but now we don't mention. When I fucked her on Wednesday and we were talking about some guy I have found that. One scenario we have is me takingher to a house to collect an item for sale on Facebook Marketplace, but really I am taking her to his house to be fucked, " do it, I dare you" was her response. She was so wet, probably wetter than I have noticed before.
I haven't asked her outright. But I am planning to ask her to come to this guys house I have met as I need to collect something that I have bought, weve fantasised ths before. I suppose if she says no then I know for her it's just fantasy. Her menopause is about to start, she's been randier than, ever, started to wear slightly flimsier clothes .
I'll be honest I'm eager to see being shared with some who I have vetted and who I think is compatible but also worried about opening up a can of worms