The closest I could find was this ELL question.
My wife and I often hang out with our two friends, who are married (or another similar group who are not). I'm looking for a succinct way to say:
Oh, we're going to hang out with our [couple-friends], Bonnie and Clyde, this weekend.
except replacing couple-friends with a phrase that doesn't sound stupid and implies that the two persons are in a relationship.