Sirius is so nice, and Peter really can't understand how people would think he ever wasn't. After all, Sirius was friends with a strange and sinful creature like Peter, which automatically made Sirius among the kindest people he knew. A number chiefly populated by Sirius, James and Remus. Madam Pompfrey, too.

Peter ducked his head and gave a little shrug. "When you're bad and full of sin you shouldn't, because you could spread your taint to others," he said in a small voice, twitching slightly in his hands. Hearing his grandfather's voice preaching in his mind. "But you guys are safe, right? You already have magic, so my sins can't rub off on you?" Peter got up, absently, moving to straighten around his bed needlessly.