The text if this is straightforward, but, as is often the case, the subtext runs in the opposite direction. The subtext say: Ah, yes. We'd more or less forgotten last lesson, but now she has reminded us. We behaved badly and rather enjoyed it. We got away with it. We upset her enough for her to remember it, but she couldn't do anything about it at the time. We really upset her. We’re really powerful here. She’s far game.