Sirius was not awkward about getting pulled off to Remus's. Sure it wasn't going to likely involve an introduction to Moony's arse. But that wasn't all Padfoot wanted out of his friend. They were friends first and foremost after all. So he was in a good mood and humming, as often happened.
Hmm, Sirius noticed a look - and not the 'I or my penis is happy to see you' sort of look. Well, really, Remus too? He saw absolutely no reason to be awkward about what happened. "Heeeello," Sirius greeted Remus, pulling James along so that he was able to get between the two of them and wrap an arm around each shoulder. "Did I miss the genius planning stage, or shall I sweep you both off your feet?" he asked.