The parsel mouths were hissing at each other, with barely suppressed agitation, gesturing wildly, when Minerva entered the library. She was surprised that Sirius even had one, he had never been the most studious of her pupils. On the other hand, she could see one of Lupin's jumpers and one of Harry's schoolbooks lying around. Maybe it was not Sirius who found the most use for this room. It felt well-loved, nevertheless.