Hermione merely rolled her eyes at Ron's warning and frowned at his retreating back. Abandoning Harry? How odd.
Then she turned, smiling back to her companions as the new drink slid into her hands. "A celebration for everyone else, that is," she sighed, "I should probably go around and congratulate more people." She looked around the room, noting that everyone seemed already well-occupied with others and shrugged, "Or I could sit here and continue to allow you two to get me drunk. Which, I believe you are doing." She waggled her glass at them with a half-smirk, managing, just barely, to withhold a giggle. But she was only tipsy. Honest.