Sirius nodded, he'd make sure people knew, especially since it seemed like Regulus wasn't interested in telling anyone himself, beyond him and Remus.
"Of course you haven't." He chuckled when Regulus denied what he had just done, Sirius was far too amused with the entire situation to push with the teasing, not today, maybe another day he'd have to bring up the teasing, or at least tell Remus at some point. "Oh yes, I do. I'm sure I have parts of it memorized if you ever feel the need to hear some of it." He offered grinning. He had a hard time imagining their mother ever saying the things she'd said to him to Regulus, after all after Sirius had been disowned Regulus was supposed to be the perfect son.