Remus seemed hesitant, though Sirius couldn't fathom why. He glanced back at his usual seat, and Sirius caught something like regret and longing on his face. What for? Sirius wondered.
They muttered through Transfiguration, twice earning stern looks from Professor McGonagall. Remus' laughter and grins, so easy to come at lunch, seemed forced. Sirius had no more classes with the boy, and so he chewed his lip and worried through History of Magic. James asked him what was wrong twice. Sirius knew that he was uncharacteristically reserved, but he shook off his best friend both times, until, on the way out, James said "I don't know what's gotten into you, but you appear very concerned about something. Let me know when you've figured it out."
Sirius knew he had done something wrong. James never got angry. Ever. Or at least, not at him. He considered running after his friend and apologising, but he hadn't the energy. He had used all of it thinking about Remus.
