Well, he's trying to figure Nat out. Stars above, he's trying. She just happens to be deceptive and mysterious at a level he's never encountered before. He's met the type before, in his galaxy there are all kinds, but there's only one Black Widow ...

On the plus side, as he continues trying to read and interpret her, he gets better at doing it to everyone else.

In terms of his behavior, it's been easy to tell that Han has been enjoying himself in the brief time they've spent together. Even in trying to be laid back about it, as he was advised, his lips have been set into their own similarly consistent smile.

"So you save the day, get breakfast with and then teach a smuggler how to use a cell phone, then what? What does Nat have going from there?"