A couple days I called my Mum and "came out", and explained what was up, and how I was seeing DK again. She was super understanding, and threw out the word "polyamourous" before I did. Like basically all my mono friends, I did get the usual "what if DK finds somebody else to be mono with? is MK okay with all of this?" but that's just something I've come to expect. It's an expression of concern for my well being.
Just kinda nice.