Amy's words come back to him - that they should date - and he can't help but smile a little. "If you'd told me all I had to do to get you to ask me out was get abducted on a mysterious space station..."

He has to point it out, because he's all too amused, now, and he has, in fact, never been asked out. Propositioned was something else entirely, but asked out? No. Not that he thinks Caroline will find this quite as amusing as him, but still.