Sirius nodded as James spoke, because he didn't know what else to do. It seemed impossible what James was saying. It didn't seem if there was anyway to regain everything back -- but then, James was absolute in his belief. Sirius knew that (he remembered just how stubborn James could be when he set his mind to something.) And the future was on their side, too. Celeste was proof of that -- and Fleur said that things got better eventually. There was no reason to not believe, but Sirius still felt lost.
"Remus and Lily are going to be pissed at me," Sirius said, trying to change the subject. There was something of a smile on his face, but it wasn't genuine in the slightest. He glanced away from James for a moment, brushing one of his eyes with the side of his hand.