After years of dabbling (online interactions, sexting, a few meetings for drinks), we finally found a guy who checked all of the boxes. Through a group chat the 3 of us talked about what we were all looking for, found that our wants and needs all synced up so we met for drinks. That meeting sealed the deal. Dude was respectful to both of us, funny, relaxed, and intelligent. A few days later we drove to his place, had a bit of wine and a short conversation to clarify the "rules" then headed to his bedroom. Almost 2 hours of fantastic MFM fucking later, during which she received the "no breaks" treatment she loves, she was thoroughly satisfied, though not quite completely spent. After the 3 of us chatted on the bed for a bit, she and I left to grab dinner and discuss. The best bits:

1) He's a completely normal guy with whom I would choose to be friends.

2) He's single without any group experience (neither do we) but it all felt pretty natural to her and me. He said it felt a bit awkward but he enjoyed it so he didn't seem awkward to us.

3) Fully expected some weird feelings from one or both of us afterwards but didn't have anything like that, even though I gave them the room a few times for a bit. For me, when she checked in with me a couple times to make sure I was still ok, even when she was in the middle of some intense fucking (and building up to one of the several orgasms she experienced), that made me feel fantastic about the 2 of us. Zero regrets, even when we were all 3 lying on the bed and chatting immediately afterwards.

4) Already planning round 2, with discussion between the 2 of us about solo dates possibly in the future under the right circumstances.

This was a tremendously positive experience. Is this out of the ordinary? Is there anything she and I should be looking out for that has a high probability of going wrong?

Thanks for entertaining the noob questions!