The rule is that when you walk into the book shop, you buy five books and sit and read five books for free. Yes, there are those exceptional and not to mention rare bookstores that let you do that. If there is someone nagging you, you may leave after exploring one other world, but only if there is someone nagging you.
The awesome that happens is that there is super cute boy checking you out and you don’t even notice! When he asks you if he can borrow the tiny chair next you, you are too lost in another world to understand his language. On finally comprehending, you say he may and go back to your book. When my nagging friend demanded I leave, I noticed the boy still looking in my direction.
Boys are impressed when you ignore them completely.