"Oh Merlin's balls!" Ron swore and Hermione gulped down the sensation of more coming up, clamping one hand over her mouth and the other over her stomach. Her eyes screwed shut and watered, mouth salivating and stomach roiling. Don't throw up, don't throw up, don't throw up, she told herself vehemently, and after a moment the feeling gradually began to subside. She opened her eyes and looked at Ron, who had lifted a slippered foot and was scrutinizing the vomit splattered on it with mild disgust. Pulling out her wand she murmured aguamenti and rinsed her mouth with a stream of water from her wand.