Of course Moony had always been more partial to Padfoot. Even beyond it making the most sense -- a wolf running with a dog in the wild, as opposed to a stag -- but because they were closest as humans and wizards, too. While James was their brother in all ways that mattered but not blood, the two of them had been something else completely.
Sirius had never minded the way that Remus got more possessive, a little more Moony with the passing of the month. It was a part of him, and Sirius had never minded the idea of belonging to someone who actually cared. In a way, no matter what time of month it was, he was already Remus'.
"I'm up for something," he agreed, coming down when Remus reached for him, kissing him back happily, even as he moved to straddle Remus a little more effectively. He pulled away to laugh, just a little. "Do you get it? That was a euphemism."