Sirius was just getting ready to launch into another round of teasing when his brother swept in from where ever he was sweeping before then and told them they were leaving.
"You make it sound like I was hurt or something." He sighed dramatically. More than a little amused that Regulus was threatening to tell James on him. "Someone has to watch out for Moony when you're not around, be glad I came to check on him, who knows what kind of trouble he would have gotten into on his own." He grinned.
Though occasionally Sirius knew when it was best not to argue - Remus wanted to be home, that much he knew, and he wouldn't make his friend wait any longer than he had all ready. "We'll see you again soon, Lils." He told her before they were being herded out.