For an observant bloke, George had apparently not caught on to loads of things. "So you and Black. . .?" he asked, sitting forward a little, as he listened, making a vague gesture that was meant to imply shagging, but really didn't do anything of the sort. Though it managed to look dirty in no identifiable way, somehow.
"And you shag about. AND date Tonks. So. You're a bit of a shagger, aren't you?" George looked a bit impressed, really, and amused.
"Never figured you for the type, Lupin. What about Harry's dad? You lot were friends and all - were you that kind of friend?" George asked. Which he actually wouldn't ask when sober, but it didn't occur to him not to, just now.