"James got nothing to do with us," Sirius said dismissively, knowing that, yes, of course he did. They clashed a lot, James and Severus, and he got why, from both perspectives. He was irritated by both of them sometimes, maybe especially Severus, but he didn't want to think of that right now.

Especially not with Severus doing that. He whined and then clambered up, crawling closer to Severus and pushing his book down. "What? What?"