The two boys pull away from each other when the door opens.
Ron is standing in the doorway, his face pale. Hermione stands next to him, her books lying on the floor where they'd been dropped.
Pansy sticks her head through the door and screams when she sees what's happened to the Transfiguration classroom.
Three tables are upturned, a vase of flowers is steadily leaking onto the floor, and there are clothes everywhere. In the middle of the mess, Draco and Harry are standing very close together, smiling sheepishly.
"Um," Harry says, taking his hand out of Draco's pants. "Sorry?"