At being called a git, Regulus rolled his eyes. By now, he was used to insults. Even if Sirius didn't actually mean them, it was difficult to tell these days. Regulus had learned to take everything Sirius said seriously, mostly because of the person he had become. He didn't fail to notice how talkative his brother was being though, which made him highly suspicious. Following Sirius into the kitchenette, Regulus accepted the sandwich gratefully. Even if it was the same thing that they'd eaten for the past two weeks solid, it was food and he was hungry. Unwrapping the paper, he took a large bite as he sat down in the other vacant chair.
Watching Sirius with a raised eyebrow as his brother leaned back in his chair, Regulus said nothing. He was extremely curious as to what had changed in order for Sirius to be so happy. He was mid-way through another bite when the truth came out. Holding up a finger to indicate that he needed a minute, Regulus continued chewing and was glad that he had an excuse for not speaking straight away. It gave him a little time to think. Remus was alive. That was good. Although Regulus had never really been on good terms with any of Sirius' friends, he had liked Remus the best from his vague knowledge of the group. When he had found out that the other boy was a werewolf, he had been thrown off. But given his new outlook on life and the people he came across every day, Regulus was a lot more accepting these days. Anybody who had earned the trust of his brother couldn't be bad in Regulus' eyes.
Finally swallowing, Regulus gave Sirius a small smile. "That's great," he said, actually glad that something good had happened. "How did you find out?"