Sirius winced at the way Remus said his name, like he had done something wrong but Sirius honestly hadn't expected to say what he had just said. It had sort of -- slipped.
Grabbing a bar for himself, he settled into the awkward silence by taking a bite, keeping his eyes on Remus as he did. "Rem -- I -- I'm not good with -- you know -- stuff like this" which was Sirius' way of saying he was scared of messing up.