PWP is not actually a thing outside of fanfic, but I will say that the ratio of stuff happening to sex in this book surprised me. The plot was “can these two nudniks realize they’re actually normal and really good for each other” and also a quiet rant on the part of Zabo about what, fundamentally, makes a good dom. It’s not a how-to guide, although it’s definitely an argument. 
The romance novel is a polemic. Change my mind. 
(Why is everyone at the ND coffee shop into kink?)
Having said that, I think I’ve finally run through all of Zabo’s back catalogue that immediately interests me so I may actually get some other books read.)