To his credit, Augustus was able to pick up on Hermione's plans within seconds. With an expression of faux confusion and outrage, he tried to stutter out some plausible excuse to explain why he might have a half-naked witch in his lap. She stood in the doorway with her hands on her hips, glaring at them both. Just to be safe, her wand was clutched tightly in her hand, the threat of it clear and on display.