She tries to make it as difficult for him as possible - even if it's what she wants, it's only half of it, and she wants him as frustrated as she is. Of course it's more a tease - she's not really mad - definitely not mad when he dips inside her, and she lets out battle cry of pleasure to show that. Her knee rises up to run against his erection, touching him with what she has at her disposal. There'll be more of that later, a lot more, but this is all she has in her right now.