Crescendo : gradually getting louder
"…SO INFURIATING!"
"AT LEAST I'M NOT THE BENEDICT ARNOLD SPREADING MY LEGS OPEN FOR SOME FILTHY SLYTHERIN!"
"WHAT DID YOU SAY! WHAT THE HELL DID YOU JUST SAY!"
Outside the deserted classroom Diana and Sirius were currently cooped up in (thanks to a large amount of manipulation by their well-meaning friends), Remus, James, Peter and Artemis huddled close to the door, throwing each other looks of mingled exasperation and nervousness. It had been an hour since they'd shut, and locked, those two in together. At first, they'd had to press their ears right against the door to hear anything. But things had grown louder and louder until they suspected the two could be heard everywhere in Hogwarts, culminating in now when the screaming and sounds of loud cracks and things being thrown were at their loudest.
"So…" Artemis ventured a bit hesitantly. "Do you think we should…y'know…go on in and interrupt?
Remus and Peter just looked at her as if she had suggested drinking a bowl of poisoned Butterbear and committing mass suicide. James, though, just smiled and waved a hand in an airy gesture.
"Nah, I think things are going…" He paused as the sound of something heavy and most likely made of glass was heard hitting the door with extreme force. "Swimmingly."