Sirius almost smirked at Regulus' comment. Certainly, the corner of his mouth twisted in an interesting way, and a year ago, he'd have smirked quite widely, but today, he couldn't quite manage it. Instead he just nodded, and waited for Regulus to finish eating and looking at the objects on the table.
For one who used to fill all silences instinctively with all manner of idle chitchat, Sirius had grown quite accustomed to quiet in the last several months. At Regulus' question, he frowned, and set his chair back on all four legs. "Generally speaking, Remus is always doing twice as bad as he lets on, and he let on that he hadn't eaten since last night, has been moving every month because of his furry little problem, and his face looks like he lost a fight with half a dozen kitchen knives. So." That was really all that needed to be said, Sirius felt. Regulus was bright enough to add two and two and come up with four.