The Dragon's Bride

I went into this expecting just porn with some flimsy worldbuilding but was pleasantly surprised. The demon realm with its territories and various demonic species is well thought out and interesting. I liked learning about the dragons' customs and how the bargainer demons gained leverage over the other territories when the portals between realms disappeared. 

The characterization could use some work—Briar is very quick to feel safe around and have sex with Sol, especially for a woman who just escaped an abusive and controlling marriage—but I didn't expect too much depth from an erotica anyway.