Very ok. It was entertaining enough, normally a regular 3★. But then you have basically a blanket argument that "slavery bad because this owner very bad. He evil. No. Not this one. This one nice to slaves. See how they happy?" instead of like... slavery being bad as a concept? I would have been happy if it had showed at least a little bit of "it doesn't matter that you treat them well they're still slaves". You can go back to being a fantasy after that, but I believe a hey-remember-this-is fucked-up flag was important. But it never did that, and we're supposed to ignore it.
I like Damen, our main character, quite a lot, actually. He's stupid tho. Very much. And we're supposed to believe he's been training his whole life to become a king.
And then we have Laurent. The idea of Laurent being prejudiced against Damen's people is ok. That he didn't like the other at all when was first gifted to him is also ok. That he is cunning and bitchy and will do any awful thing to survive the court. All fine concepts that form an interesting character. But that the choice to show all of these characteristics led to him getting Damen close to and then actually raped for no real reason is not ok. Not when they're supposed to be together eventually.
The inconsistencies between actually interesting scenes that develop their relationship and some very gratuitous actions that could've very easily been more plot-justified or explained (A lot of this steams, I believe, for it being initially a self-published book, and I recognize that) sum up to a regular result. Overall, a fun read, but suspension of disbelief is righly required to ignore it's problems.