Was this fiction Literotica? Its a common trope, "You are mine" as opposed to "I'm yours". I dunno. Some women are into that.
Yeah, in real life, I could see this as sort of creepy, but I have seen "creepier things"....
In fiction, that is....
Such as a father admiring his daughter's womanly form in the moonlight realizing how grown up she had become - is that perverted?
Such as a niece, grown up, visiting her uncle she hasn't seen since she was a kid, and her uncle realizing, even fearful, that his niece was sexually attractive, coming to vacation in this new land..... fearful that other men would seduce her, that is, but yes, acknowledging her attractiveness himself. Perverted? Some would say yes.... More so, he realized she wasn't a child anymore, and when the uncle's heart was broken, he gave her a ritualistic piece of jewellery that indicated she was single and willing to marry - any man of her choosing (Not him, of course). Throughout the course of the story, she does end up falling in love with someone and marrying them. Her "vacation" is lengthened when her parents are killed back in her home province, by tyrants (who kill of any rebels to the uprising - to which her parents were).
There are crazier things.... Game of Thrones, the book series, certainly has its moments!