@Omled Let me address your points:
"In a normal standpoint, the answer to your question is that, yes, it is creepy. But it is in NO WAY her situation is normal." - NO. Even in a medieval standpoint, what he did was creepy.
"What I'm getting at is the king wants Nina to stay by his side just like what he did to the saintess. And there is no way that is sexual" - Just like the saintess... Hmm... You mean the kidnapped saintess that is being held against her will? By the way, their relationship eventually turned sexual, so not a good argument.
"Also, you just set aside the first statement in my first reply which says, her situation can no way be compared to a normal workplace that you keep on pushing." - No, I addressed this. I mentioned that I used that analogy in the hopes that you could relate to the majority's POV. But sadly, you did not.
"You also mentioned a "moral standpoint". Moral standpoint differs depending on very numerous factors. And there is no way your "moral standpoint" is the same to theirs based on their culture in which I also mentioned, medieval-like, and many other factors.
You keep on comparing the people's values in this world to a fantasy world's people with different values which makes no sense itself." - Just because the setting is medieval doesn't exempt the characters to the morality of the modern viewers. There is a reason why such things (ex. Slavery) have been abolished as time went on. This argument of yours just won't hold. Just because he has the power and right, doesn't mean he is correct.
"The fact that people connect the blood-lip thing the king did to a sexual sense is also nonsense in of itself." - Never have I claimed this as sexual. Just let me tell you, a person can be creepy without it being sexual. For example, I find your defending of the king's action creepy, and that is in no way sexual. You are the one who has preconcieved prejudices. Here, the 1st definition of the word with a quick google search:
creep·y /ˈkrēpē/
adjective
causing an unpleasant feeling of fear or unease.
"YIKES" - IKR
"Also, Nina said that she is a "kid" both mentally and physically despite reincarnating which is understandle if she took what the king did to a sexualish-romantic kind of way, but almost all the people that read this, as I assume, are avid readers, should know more than to take things to a sexual sense immediately." - I agree, not everything the king did was creepy. But there is a line that shouldn't be crossed. I for one hoped that they will be more like a family and he'll adopt her. I certainly did not "take things to a sexual sense immediately".
"This argument is kinda pointless anyway. Just a bunch of opinions from different people." - Morality can be subjective, but you have admitted it yourself, what he did was creepy. You just reject to view it as that, because you keep on insisting to look at it with your medieval-tinted glasses. Well, no, doing that even in medieval times is objectively wrong. The meaning of the word "creepy" will remain the same, then and now. He is creepy.