Sirius worked so hard to pay attention to others, to focus on them, to help them, that the tendency to focus on himself, easy as that was, didn't come out as often as it used to. When they were teenagers, Merlin, Sirius looked back and knew he very easily made almost everything about him. Reg needing protecting, becoming animagi to help Remus, trying to figure out if Peter were shy, a late bloomer, or perhaps asexual, those sorts of things had helped him then. Now there was no shortage of help, but he still felt conscious of how much he'd been talking about him, just a bit. But Peter didn't look like he had been walked on or anything. No, Petey was his best mate and listening, and it was good. That made him feel a bit better, looking over at him.
"Yeah, except we seem to end up together a lot less often, back in our own worlds," Sirius pointed out. There was nothing wrong with that. Things happened, other good relationships, ones that didn't mean any less because it wasn't the two of them. And that was okay too. But he looked over at Peter after his quiet statement, "I don't know. I don't think we know enough to make that judgment." There were other worlds where Peter wasn't bad, like the factions one. Peter was a good guy, and Sirius didn't know why things went the way they did in other worlds, but he didn't think it was wholly Peter's fault, those Peter's. His Peter was the best possible Peter, in his very biased opinion.
"And you're my soulmate, Peter. You were the one person I needed to talk with tonight. Accept no substitute."