When he saw Regulus in the doorway, Sirius' shoulders slumped and his worried expression transformed into a glare. "You are a git. I was about to go looking," said Sirius, turning on his heel to enter the kitchenette. Still, the fact that he spoke two full sentences, longer than three words each, should have indicated to Regulus that he was in a better-than-average mood, and that he hadn't spent his day off moping.
Sirius reached into the fridge and took out a sandwich wrapped in butcher paper. It was fairly plain, but it was food, and cheap food at that. "Here," he said, handing it to Regulus and taking a seat in one of their two rickety kitchen chairs. He leaned the chair back on two legs, which was very much more like the old Sirius than the new one.
After Regulus sat down, Sirius finally came out with what he'd been wanting to say. As was his way, Sirius gave the information straight out instead of building up with a bit of exposition. "Remus is alive," he said, matter of factly, but his tone couldn't hide the smile on his face.