"What? That's not fair," Sirius is saying, but it's clear he isn't going to get out of this without further trouble, so he shuts his mouth.

James can imagine the look on his best mate's face, and tries not to laugh from where he is.

He shrugs at Lily.

Seconds later, Remus shuts his book with a quiet fwomp and gets to his feet.

"Well, I'm going to go back to the Common Room now," he says, as though this is any normal day at the library for him.

James is almost entirely impressed.

"Good night, everyone. I'll see you in Herbology in the morning."