Welcome to our forum.
It sounds to me like you have a pretty pleasant/steady relationship with your two companions. It paints a picture that makes me smile. We could say that you are in an MFM "V" (or emotional triad), where D is the "hinge person," and you and J are the "arms of the V."
You have a great advantage if you're good at communicating with each other, as communication tends to be one of the key ingredients to making a poly relationship work. I'm sure you will find additional helpful info on this site as well, and probably have some new thoughts and questions to post. Do post those when they arise!
I'm glad to have you with us.
Love means never having to say, "Put down that meat cleaver!"