George had, in fact, not known that Remus liked men. Mostly because he'd never thought about it, and then Remus was dating Tonks, who was not male. (Though they'd once tried to ask her if she could in fact MORPH into a male, and whether said equipment functioned if she did. Luckily they'd gotten distracted before asking. Though they kept meaning to again.) So he'd just figured Remus was straight.
Apparently not, and George's expression, a little drink-blurred already, registered surprise. "Yeah? So. . . does she know that? I mean is it the sort of thing where you both play about on the side, or you get another bloke in bed or something?" Which was actually a bit hot to think about. Not that he'd thought about Lupin naked before. Tonks maybe. But then she'd never been his Professor. Though really that hadn't kept him form picturing Sinastra naked. A lot. It just never occurred to him with Lupin.
Wasn't such a bad image when he thought about it like that though. Skinny and gray, but a bit fit for his age.