Sirius came out of the kitchen, a bag of crisps in one hand, a soft drink bottle in the other. He grinned at the game system that they'd gotten the kids for Christmas--neither one of them were playing right now, which meant Sirius was going to take advantage of it.
He saw Remus going toward the door and was about to ask why when he heard a rather annoying voice offering greetings. A visitor? Sirius put his snacks down and pulled his wand from his back pocket. He was still out of sight of the front door, so if the visitor had evil intentions, Sirius still had the benefit of surprise.
The question shocked him, though. By the way it was worded, it could only be Kingsley Shacklebolt--or a clever Death Eater. But, Kingsley? Here? Sirius waited for Remus to answer and to ask a counter-question, adjusting the grip on his wand just in case.