Thank you so much for your responses!
I know we're new to everything, and we've decided to just roll with it, and see where it goes. I can't predict anything that's going to happen, but I do know that we have decided to not seek outside the quad for the time being, because it just feels right.
My husband and I are all about 100% communication, and have been for awhile, making our open marriage pretty successful thus far. This has also become a neat teaching opportunity for us to the other couple, because they haven't quite perfected the communication thing, but they are getting so much better just since all of this started.
I have so much more to say, because I'm excited that I now have a community of people who are going through similar experiences that I can draw from, but I'm sure my words will come out as time goes along.