It was instinct, honed of said years living more or less on top of each other, to reach up for Remus's hand; but Sirius caught himself and dropped his own again before he actually made contact and then rolled his eyes with a pointed laugh to cover it the misstep. "Oi, you got one in my hair and shared it with the world, isn't that enough? Don't go trying to make me admit anything on top of it. Let me keep some dignity, here."
All of which was meant to come off flippant and teasing but actually sounded a bit shaky in hindsight, so maybe he wasn't actually talking about hairstyles and maybe he was going to give himself away if he didn't get out of this conversation right now. He pulled away, quick, and nodded toward where the others were grouping up. "C'mon, debrief, yeah? Let's go."