My wife and I (both 37) have been together for 15 years now. Last year, during sex, I asked my wife what her fantasy is.

She told me she wanted to have sex with another man whilst I watch.

Whilst c**king is not my thing, I was turned on by the thought of hotwifing. As long as its pure animalistic, sexual gratification. (No emotional attachment).

Since then, it has become my fetish. It's what I have been masturbating to ever since then.

For the past few months, I have been entertaining the thought of making fantasy a reality, and have even suggested it to my wife. She is up for whatever I want.

I just fear a few things. One being, her getting too invested into the 3rd. Ideally I would want them to be a total stranger.

Secondly, and most importantly... post-nut clarity.

Whenever I'm masturbating to that sort of thing, thinking how much I love it, I finish and instantly think "Nope! Not happening!"

We have on several occasions spoken about it, even in a non-sexual environment, and we both seem up for it.

She's now more interested in being in a FFM situation, which obviously I'm down for, but a unicorn situation seems very unlikely, in reality. But nothing turns me on more than the thought if her with another man.

But I'm just terrified I'll cum as soon as my wife is penetrated, and I'll hit jealous mode and regret everything.

Should I ease us into it with a SW? Doing only what I feel comfortable with?

I genuinely do feel like I want this and I know she is down for anything.

I'm just so nervous.

What should I do? (Plz be kind)