He shows a profound interest and constantly wants to be near you.
Ask him. I've never met a female yet who needed instructions wagging her tongue.
When that's not a banana in his pocket.. lol
What about a pencil?
It really depends on the guy. If you think he may, just ask him. It may not be the answer than you want, but it's better to know than to not know.
He will ask you to date him.
He will give you wedgies