Sirius mock-huffed at her laughter and raised both brows as though expecting her to stop as soon as she saw how serious he could be. Which, with an apron and bits of drying dough sticking to his cheek, was admittedly not a stoic sight. He couldn't hold his expression for long as he cracked a grin of his own upon closing the door.
"Yeah, well... don't go getting used to it. I'm trying to be productive and bake cookies the Muggle way, so Remus can't say I'm not being useful." Something of an exaggeration, since Sirius thought that he was always being useful. Being a rather wealthy person with no occupation was beside the point. He could lounge about on his arse all day drinking beer and it'd still be useful since he had no need of a profession. But still, Sirius was never one to let himself be called lazy.
"Why the sudden visit? Not that I'm ever against seeing your gorgeous face," he added, a waggle of his eyebrows the only warning before he swooped down and placed a flour-covered kiss upon her cheek.