Noct may be drunk, but he's just lucid enough to catch that note of sadness. Sadness that is not allowed at the moment. So he hugs back tighter, too. Nuzzling a little bit into his shoulder and completely forgetting about the decreased age gap. Because it's him; he's really here.

"Mm... 'Never do." Which is probably at least a tiny bit reassuring. Even though Regis has no idea at this point of time.