Hmm. I understand why they didn't go into too much detail about Jee's past, because "child sex slave in Thailand" seems less like something you can use respectfully for a girl-power plotline than some of the other backstories these characters have. And I get having the plot with Reg's abusive mother running in parallel there; it sort of helped to break up the intensity of Jee's deal. At the same time I was a bit let down that Jee didn't actually get a whole book to herself. It felt like the author, having created this character with that backstory, didn't entirely know what to do with it (which, to be clear, I wouldn't have either).
I wasn't always sure I was on board with where they were going in terms of dom/sub stuff, but the more we find out about both Jee and Reg, the more their particular version of it made sense. It also grew over time from the "you worthless dog" thing it had been at the start, as they both worked through some of their stuff. It seemed to be one of those relationships that doesn't start out perfect and healthy but that grows towards something really good eventually. And I very much liked that in a novel about women, sex, and women's relationships to their bodies, that the default D/s setup was F/m. "She just needs a powerful man to sweep her off her feet and show her what she *truly* wants" isn't the only way to show sexual liberation, and I really appreciate that about this series as a whole.