Looking for some specific advice on how to break the ice, what would you do?

So a friend of mine from college and his wife live in VA (we live in Atlanta GA). I have never been incredibly close with him and I haven't interacted at all with his wife despite following her on socials, but over the years I started paying attention to some signs that they are swingers too. They follow alot of OF accounts on IG, like most of the same kinky memes, etc. I got curious about a year ago and texted him to ask if they were indeed swingers. He admitted they had some soft swap experience and enjoyed getting sexy with friends. I told him we were swingers as well and the conversation ended after some back forth.

Cut to a year later, he and I started reacting to each other's socials more. I added him (and his wife) to Close Friends where I share more suggestive memes/raunchy pics of my girlfriend. Both him and his wife are hotties. My girlfriend agrees she's really interested in them too and follows them. He was passing through ATL once and asked if we were available to meet up but I was out of town, I told him we'd be happy to host them next time they're in town though. Once I posted a racy pic of my GF (with her permission) to Close Friends which he reacted to, so I offered to share our couples Reddit account (which has nudes on it) if he wanted to see more. He responded with "of course" and then liked the link I shared.

It's clear that there is mutual interest between all of us, both he and his wife like and react my girlfriends posts on socials as well. GF and I would both love to heat up the interactions, maybe get to more direct flirting and exchanging pics, to eventually getting them to come stay with us and visit for a weekend. But with them so far away this seems like a difficult task. Ideally getting all of us into a spicy group chat seems like the best goal for now.

How would you break the ice here?