Not really opposing your opinion but just to have a different perspective, he's been in love with her for 5 years and you know people of the harem only exist to serve the king/sultan. So for her she was only doing what was expected so when they had sex the first time it was consensual. Then when he learns she was a virgin he said she's all mine because his father didn't deflower her. Not like an object kind of thing but that he's the only one who would love her and be with her. Hence there are no other women in the harem and just her. She's degrading herself because she was sold by her parents to be part of the harem plus she isn't a noble so she doesn't see herself as an important person. Besides love is spontaneous some people fall in love immediately and others over time so we can really say they only met a few times and their feeling are over five years long just liking from a distance. Now the people he killed like his brothers was so that no one else would try for the throne. It's actually pretty common in most stories about succession and such and it used to happen. Plus his sister betrayed so she kinda deserves it.
Hopefully this helps you understand the story a little bit more (⌒▽⌒)
I enjoyed the translators notes more than the story
I guess it was ok by the end but i cant get over how it was in the first half. He realizes that she thinks he only wants her for sex, so instead of reassuring her....he has sex with her? Then he realizes shes a virgin and goes harder??? Then he does the "shes all mine only mine" cliche thing. Like bro shes not an object????? Then hes surprised when she degrades herself. They interacted like 3 times and had sex 5 times. Also he kinda killed a whole bunch of people that didnt deserve it(not the people at the end) maybe its just me but this story was kinda weird. At least the art was pretty ig.