Remus rubbed at his neck and shrugged, "She knows of my inclinations," he answered. And sometimes he felt bad that he couldn't - or wouldn't - be more open with her about what he needed, but he had tried to tell her more than once and it just wasn't a conversation they'd ever been able to have. Being a werewolf wasn't the only reason he'd tried to discourage her from pursuing an actual relationship. But the fact was, he did love her and he would do what he could to protect her from knowing certain things.
"But no," he answered, "there are no understandings between us. It simply isn't talked about. We don't live together, we're not married and she knows that I have my reasons for not doing those things. Though I do imagine it wouldn't take much to get her to let another man into bed with us if I didn't have to constantly battle with my own territoriality and possessiveness. It's the nature of the wolf," he sighed and waved a hand dismissively. Maybe that was blame-shifting, turning responsibility onto a nature he couldn't control. He could just admit that he couldn't settle and that it was his own problem. But as far as women went, Tonks was all he could ever desire. There was just that other need...
He glanced up at George, giving him another once-over and then leaning back to take a drag off his cigarette. "Not to say that I didn't have a good bit of fun when I was your age. Sirius always brought girls home who were in to that sort of thing."