When my son was a preschooler, he decided he "liked" a little gal up the street. He wanted me to write her a note.
It said:
"I like you. You wear pretty dresses"
He then marched up the street, rang the doorbell, handed it to the gals Mom and calmly walked back home.
We got a lot of miles out of that story as he was hitting puberty
Thanks for the reminder Cats