Swinger etiquette

We have hooked up with a new couple a couple of times in recent months. Both times bi play with the lady was a ton of fun. Actually they both have been fun to be with. BUT the first time the guy could not get it up. We were mentally prepared for it and did not sweat it. He sort of indirectly acknowledged it and said it was a tension issue.
Fast forward to the second time last weekend.. everyone had a great time again. I really enjoyed the lady. This time I got to down on her (last time we did not come around to that somehow), got her to squirt, she got me to come as well. A ton of fun. All had great time really. He appeared to be hard which I was pumped for. But then he tried to go for it without the condom (first strike). I prompted him to put one on. He did and lost it again. He ended up being redirected to his lady and finished there. I got wonderfully taken care by my partner and all was alright. Except I was mildly annoyed about blunt attempt to do me without the condom (btw condom rule was initiated by them!) .. and then in a quick discussion as they were heading out it came up that he cannot keep it up with the condom at all and he knew this ahead of time based on their previous swinging experiences (strike two). The kicker is that we have explicitly discussed their previous experiences and he indicated that everything functioned just fine (strike three!)?
In any case, the fact that he could not get it up actually was a bummer but not a huge deal. Trying to skip condom and lying about the issue are obvious enormous 🚩. So there won’t be a repeat with them.
The thing is that he leaves a couple of hours from us. She lives near by. They are FWB, both have nested partners and occasionally date solo.
She actually reached out to me directly because she thought she noted our interaction about the condom and wanted to confirm it.. once confirmed she got super mad at him and apologized profusely for not reacting in the moment. Mentioning that she understands that we won’t be hooking up with them in the future and stated that she really enjoyed being with the two of us.
That said I have a feeling that she might reach out to us to join as a third on occasion (we already discussed it a bit when we all still through swinging will continue after the first get together). Given their relationship I feel like that might be fine because we hit it off great on multiple levels. At this point we won’t be reaching out ourselves but their dynamic made me wonder.. it is not really a wife poaching scenario as they date solo on occasion and we won’t make the first move. Thoughts? My moral compass is not exactly clear in this (hypothetical) scenario.