Draco hadn't paid enough attention to Black, Lupin and Old Potter to really comment on it. But Regulus hugging Snape was an amusing thought.
"Do you actually think your father would admit, or maybe even notice, that his best friend was obsessed with him? But maybe that's just because he died. I have not and will not care enough to untangle that relationship."
He shrugged, then lounged back in the chair. Potter wanted some space, he could have some space. But this was a project that Draco was very much looking forward to tackling.
"I think friends touch more than you think. But Weasley isn't exactly the demonstrative type, so that doesn't surprise me. Besides, you're not an experiment. You're a challenge." He laughed, and while he meant it as a joke he was also very serious. "I won't embarrass you in front of your people, don't worry. I'll keep the public touching to a minimum. Saviours can't be seen to be too human."