Remus smiled even as he barely managed to keep himself from turning his head and burying his nose in Sirius' hair. Not that he needed to, his nostrils filling with the scent with each breath. The fact that Sirius was willing to let him work ahead and even to help him do so when he didn't agree with the need to do so filled Remus with warm, squishy feeling in the general area of his heart. It was little things like that which made all the difference.
"Yeah... the pages with little flags are the charms that I'm considering. Just got to choose one." There were four little sticky note type flags sticking out of the book at random angles. "Levitation would be a good one, easy to come up with lots of examples, but then everyone'll be doing that one cause it's relatively easy. Or maybe a heating charm, still relatively easy to come up with examples. I dunno."