
it's sounds a little weird to me that he calls "her" mon chou since it means sweetie and it's usually used with your lover but well...
at the same time i can't think of smt else other than mademoiselle that could maybe sound better for his age and situation
i'm not complaining tho i'll definitely follow this manga ! (๑•ㅂ•)و✧

But even if he considers her as his first love, kids don't normally use this terms
It's usually used by lovers (like bloop bloop said) or by people when they talk to people youngers than them (for example, a grandmother/mother can call her grandson/son/daughter like this)
So for a French, it sounds a little bit weird/off but it's not a big deal ╮( ̄▽ ̄)╭
Karen tries to take the kids
http://www.mangago.zone/read-manga/akuma_no_mama/mdx/mpn_chapter-1957650/pg-6/
...is this a spider-man reference?