To "storm out" means to leave angrily. This usually means that the person is in a bad mood and will walk away stomping, slamming doors, hitting things, or whatever they do when they aren't happy. This is the context "storm out" is usually used in. To be a "sucker for (something)" means that (something) is something you really like. This usually implies that (something) is like a weakness to you, and you will most likely never say no to it. Hope this helped!