Fleur’s additional comment about disciplinary action caused her to giggle harder since that was exactly what she had been thinking about. The naughty punishments Fleur gave her wasn’t what she wanted to think about with Snape there.
The gazes of the two Professors on her only made her giggle harder. “Sorry,” she muttered again. Snape’s gaze hardened disapprovingly. He looked between Fleur and Lavender for a moment but said nothing.
“Well, she had a potion of….questionable origin on her,” Snape exlained. “She has not told me from where she had procured it. It would be wise for her to tell somebody. I am sure that Aurors would not be pleased by its illicit nature.” He kept his features perfectly schooled as to not give away anything.