"Hello!" Sounding at least a little more bright--and certainly less confused--than Robin.

Surprisingly enough, he seems to get the hint about reading over Robin's shoulder... It's all the other social atrocities that he's oblivious to. He stops peering at the book when it's tipped away, and focuses on Robin's face instead.

And this includes sniffing at it. Not exactly touching him, but it's alarmingly close. Especially with the way that the guy's eyes appear to just be indiscriminately leaking red.