Draco had been pushing for Harry to stop worrying about everything, and he definitely wasn't going to keep the subject going once he'd decided it could be dropped. They could worry about it another day.
He laughed at the idea of casual affection being a Pureblood thing.
"No, definitely not a Pureblood thing. Or a Black thing. You don't see Regulus hugging everything that moves, do you?" He thought about it for a moment. "I have no idea why Sirius is how he is, and I don't care. But casual touch shouldn't be weird. I think you just haven't had enough of it." He took Harry's hand in his, squeezed it, then let go. "Friends touch each other. Or at least mine do. It's natural. Tell you what." He moved a little further away, to give Potter some space. "I'll keep touching you, and you tell me when it's too much. It's about time you got accustomed to casual affection, with no ulterior motives. Even if touching during sex is very nice."