a goody two shoes
A goody two shoes is a person who always sides with the teacher, never messes up, and thinks they’re better than everyone else because they don’t know what it’s like to be bad.
My goody two shoes neighbor never eats candy and won’t even watch a movie with swearing in it.
My goody two shoes friend got in trouble for eating a cookie during lunch.
My goody two shoes brother would rather die than do anything that could get him in trouble.