First time jitters!! Need help please - cock ring?

Hi, I am fairly new here; short background is my wife and I are married 12 years, we've wanted to add a partner or 2 for the last ten. We've had a few false starts with couples; we finally figured out that MMF is right for us.

She has been online finding some candidates; we have narrowed it down to just two. We are planning to get together in a couple of weeks with one of them. We've shared all the preferences and limits; we both want to share him orally, we want him to fuck her deliciously and leave me a creampie. We want to suck him off and ***** his cum.

I want this to happen whether I am currently horny or not, so I know it's more than just masturbatory fantasy.

My concern is what will happen when it gets real. I have a fantasy of climbing on my wife after he's fucked her full, adding mine to the mix and then cleaning her up, but my concern is that I will not be able to 'perform'. I'm kind of shy that way...

I'm also worried about any emotional change when this fantasy comes true - less about that, though.

Note that this is not the D/s cuckold scene - it's me and my wife sharing our cum fetish and her desire to be pounded more often and by numerous strange men.

I'm thinking about a cock ring - any thoughts?

Thank you!