"What on earth are you doing down here, Potter?" she inquired a little more tersely than she'd meant to. But she really hadn't expected to be caught with a mess of a potion.
Or at all, really, and certainly not by him. On a Friday evening, he had nothing better to do than stalk an empty classroom?
Well, what would have been an --
-- oh.
She smirked faintly. "Or were you down here trying to nick something?" She didn't think James would voluntarily attempt to brew a potion - unless it was going to serve him in some prank or another.