I agree with kags here. While yes I think they're putting too much into the romance but there is no sexualization going on here. It's just childish, clumsy affection. It's a little too much at times but little boys can be just as pushy.
But it's Not sexual in anyway.
I think you're confusing the uncomfortableness of his pushiness with sexualization and seduction and those are just too different things.
Agreeing with Kags. Also children feel attraction, in the sense of, ooh pretty! I’m going to cite personal experience for background. I started having crushes in pre-k. So 4/5yrs old to my fellow 4/5 yr olds. I started actively flirting when I was 6/7 yrs old, my cousin who was younger called me out on it. Like why are you so flirty with that one classmate
Agreeing with Kags. Also, children feel attraction, in the sense of, ooh pretty! I’m going to cite personal experience for background. I started having crushes in pre-k. So 4/5yrs old to my fellow 4/5 yr olds. I started actively flirting when I was 6/7 yrs old, my cousin who was younger called me out on it. Like why are you so flirty with that one classmate
I think it was the scene where shes asked about her type in men ans how it felt pretty implicated that stronger feelingsz were being implied?? Im not sure i just didnt feel the usual warm cozyness that this trope usually has.
Like lets take that one girl characyer from the lombardy family named firentia, and her relarionship with the prince in that story. Their character building together is cute compared to this in my opinion.
I know its a word vomit reply but maybe its because im in my 20s with my nephew beside me, i cant imagine a kid around his age to act like this.

Its weird how author decided to make the prince so fucking weird? Why is a kid seductive to another kid, and why is he so informed about likibg the other gender when he doesnt look aa year older than the MC, he could be 8-11 years old.
Maturity is one thing but it feels weird for the children to be sexualized when theyre supposed to be all food and play at that given age.