"Sirius...." Remus warned, voice low - a portent of impending anger. When Remus got angry, it was very rare that he got loud, instead he got very quiet. He wasn't quite there yet, but if Sirius wasn't careful, he could be very soon. He didn't like upsetting Madame Pince, spending enough time in the library that he felt a need to keep a positive relationship. "I need to finish this because it was due last week." He hadn't finished it because of the full moon, probably should have finished it days ago.