James nodded as Sirius went on. There wasn't any harm in a bit of fun, and James was hardly in any position or disposition to go pointing fingers to criticising Sirius's practices. Hell, some of them were his own vices. But when push came to shove, Sirius kept his head on straight-- and going after Remus would have most certainly been an Issue.
And maybe it had sort crossed into James's awareness, the way sometimes Sirius's attention could hone in on Remus. But that just... happened sometimes. James had ignored it. Because if he hadn't, then maybe they'd have had to talk about it, and it wasn't something he'd wanted to have to talk to Remus about because Remus didn't really see the whole snogging thing in quite the same light that he and Sirius did and there was just no way that that would have ended well in James's head. James had ignored, and Sirius had behaved, and after a while James thought it had sort of gone away. It was easy enough to believe, as Sirius certain found other interests.
But really, for fuck's sake-- what the hell was this place. Screw Around with the Marauders Happy Fun Land?
"And he uh, turned you down?" James surmised. He didn't act surprised about the rest of it. He just took it for what it was: the way things were. Or had been. Or were again. Who the hell knew. But it wasn't in him to actually 'judge' much of anything Sirius did, let alone what he wanted.