Lovely open poly romance/relationships story. 

Deals with a lot of grief over the course of the book, so not a fluffy read, but lovely in how it handles its characters and relationship development. Could standalone, but I hope there'll be more.

Useful definitions at the start, I wasn't familiar with all of them ... and note there's a character list at the end, I mostly tracked who meant what to whom ... but a couple of side characters I needed to check to be sure.