Beckett: That my man would stop talking about being some skeezy blonde's master and start talking about taking his wife to bed.
Castle: Oh well, I don't need a genie to grant that wish.

Beckett: Time machine?
Castle: Only to go back and fall in love with you all over again.

Castle: I have no need for genies because I already have everything I could ever wish for.
Beckett: Right back at you, handsome.

So after eight years some of my common sense has finally rubbed off on you.

Beckett

Can you make sure he gets dibs on the first rub, please?

Beckett

Got a crime scene right here. My mother just killed the mood.

Castle