Remus' look of feigned-outrage lasted only a moment because, really, he couldn't argue that. A Gryffindor would be the first to get caught, likely hurt, and likely the first student to try. "Hm, you may be right. Let's not tempt the students into mischief they don't need to meddle with," he chuckled. "Of course, you could just put the house under Fidelius and then it wouldn't matter if they didn't know it was there. Would Severus, I wonder?"
"Some were Greyback. Many were myself, especially as I got a little older and it was clearer that I was doing this," he waved one hand absently over his scarred body before wrapping both arms around Regulus again, "to myself. But, we'll see. I'd rather avoid potions all together. Disturbing is a good word for the way I feel about most sleeping potions, as well."
Smiling gently, Remus shook his head. "It's not the use or disuse of the Dark Arts. Granted, they have their effects. But, something that's dark isn't inherently evil or not good. The Dark Arts have their uses. It's who you are beyond the the magic you use, though, that is more important. Maybe my perception is skewed because of the differences in my own dark side and that of normal people. But, it's the same lesson I keep trying to teach my classes -- It's not the type of magic a person uses that makes them evil. It's the intentions of their heart. And I don't see anything about your intentions to negate my opinion of you."
Watching Regulus thoughtfully, Remus pondered his next words carefully. "Is it possible you aren't doing Sirius an injustice? I know how you feel about this and I'm not saying he'll ever be what you want for the head of the family. But, Sirius...isn't the same Sirius he was forty-five years ago. And he cares about this family a great deal. He wants to see it and, more especially, you succeed and be happy. Maybe he wouldn't be as bad an influence as you fear?"