I am probably going to get some major lashing for what I am about to say, but, what can I say, its my opinion.
I really do not like the idea of the CaptainSwan ship. Yes, they seemed to have a bit of chemistry back in Tallahassee, but that was quite a while ago. Since then, they have been working against one another and they definently do not trust each other. As caniving as Hook is, I do not foresee that changing (unless he has some major character developments in the next four episodes).
Hook would flirt with anyone, hes a pirate. This ship just does not seem realistic to me.