First threesome problems

I’ve (F) been talking to this married couple(M&F) for a couple of months. They’re super kind and make me feel comfortable and everything and eventually they want me to be apart of their relationship. A couple weeks ago they brought up having a threesome(would be my first) and of course I agreed so a couple days ago I went over to their place we all had a few drinks and it happened everything happened so fast but it went pretty well from my memory just a few things I would change (it was my first time actually being drunk so my memory is a bit foggy)

My only issue is the whole time I’ve known them we’ve never talked about boundaries sexual and in general which I definitely meant to bring up before the threesome happened I just never got the chance / right opportunity,

after the threesome happened we really didn’t talk about it, kinda acted like it didn’t happen (surprisingly wasn’t awkward)

My question is how do I go about bringing this up, it’s been a few days since the threesome happened so I’m not sure it’s definitely an important conversation to have so everyone is on the same page with boundaries and turn ons (even though the threesome went well I’d still want to know)

I was thinking about bringing it up the next time I saw them in person but I’m not sure