It won't be so easy to let go of that habit. It's half of her core personality. Well, it's not like she really needs to let go of it. Utsumi wouldn't have fallen for her if he hated that part of her. But she does need to be actively aggressive in his company whenever she wishes for something to happen. Because Utsumi respects her chameleon character and won't try to make her change. He probably believes she's the most comfortable like that. If she's comfortable, he's happy. But they won't be experiencing too much intimacy and flirting like that, so she will need to occasionally push hard. He's not really the type, himself, but perhaps if she does it first, he will surprise her later.