I was a child and she was a child,
In this kingdom by the sea;
But we loved with a love that was more than love-
I and my Annabel Lee;
With a love that the winged seraphs of heaven
Coveted her and me.
But in any case, it's already been done many times in many ways, from blatant to subtle. Two hit songs that I know of were founded on the inspiration of tween girls: Dolly Parton's "Jolene"; and "Itsy Bitsy Teenie Weenie Yellow Polka-dot Bikini". There are doubtless many more.
More recently, a number of songs have explored intergenerational attraction one way or another, as some expressions are more acceptable to the public than others (e.g. "Hot for Teacher" and "Tracy's Mom"). But, a few recent hits have made subtle comments that most listeners have so far probably missed. You are welcome to add to these.