If i remember correctly from novel seme never liked to talk about his bed time stuff to others so he never discussed with Stalin about he is treating uke with her and others as well people around seme are always concern for uke cuz they pitied that he become a thing he wants to keep at any cost without giving it any name , seme's sole reason was to make uke his concubine which made him bind to him which uke violently refuses so seme shifted uke to his maternal family northern palace not to concubine one ,to keep people away from uke from meeting others to him only seme and few knights can enter that palace no one else can stalin is wicket woman but she and him never made fun of uke situation she also pities the uke and as seme become miserable with his "uncertain feelings" which he didn't wanted to accept.....
He keeps him but uke never gives in to him any time they had sex were never peaceful cuz uke never wanted them every time he wish to accept his fate he still holds to his pride man who once fought in battles unlike seme and he try his hardest to deny seme so it shows on his face so Stalin also makes fun of that too later seme started to dislike Stalin cuz she is also mocking him lol man ego gets hurts , uke will become thinner by novel explanation he will keep his long hair open all the time which shows how miserable his life become he loves seme but can't accept to become side chick which would be discarded later by seme where he always has to ask for affection like his own mother , basic fear of uke was that how his mother suffered by becoming a concubine asking for love and affection waiting for his father but he never come to her he didn't wanted to go through that cuz he knows seme only curious or little interested.
If you are looking for some sweet story this isn't the one, the crown Prince is a fucking sadist, obsessed with the Uke and will go far and beyond to claim Uke body through a deal!! He is a damn monster, Uke suffering is what gives him pleasure, plus he claim he isn't in love with the Uke but he can't have another person take the Uke virginity because thinking of the Uke in pain gets him hard (Wtf!!)
Another character will appear called Salina and together with the crown Prince they will frame Luce best friend and the woman he loves making the best friend seem like a traitor and then the crown Prince will ask to kill Luce best friend on the spot if found, so luce goes to beg for him to not do that but guess what.....
He agrees in exchange for the uke to sleep with him however he never told him that after he sleeps with him he will officially be his concubine for the rest of his life.
Plus he fucked the uke without any preparation and the uke bled arghhh I was so pissed!!!
After he did this to the Uke, he had a meeting with that Salina girl and laughed it of cause he got what he wanted He also made sure the Uke is no longer the captain since he is his "bitch" now and should spread his legs whenever he wants it. He treats him like a prostitute basically.