In "Always," Castle finally opens up to Beckett, pouring his heart out: “Four years I’ve been right here. Four years just waiting for you to just open your eyes to see that I’m right here. And that I’m more than a partner. Every morning I bring you a cup of coffee just so I can see a smile on your face because I think you are the most remarkable, maddening, challenging, frustrating person I’ve ever met. And I love you, Kate.” It was a memorable scene that was followed up by the unforgettable moment when these two finally, finally, finally got together.