'Why did you kiss her?'

'Who?'

'Nikki'

'Because… You were Nikki?'

'Nathalie.'

'Oh. That Nikki.'

'I know you didn't sleep with her. But why did you kiss her?'

'How do you know that?'

'I'm a detective.'

'Yes, but...'

'She told me. Nathalie.'

'So you two are friends now?'

'She asked me if you were gay.'

'What?'

'Because she wanted to sleep with you, and you rejected her.'

'Really?'

'She asked me to give you permission.'

'For what?'

'Sleep with her.'

'She did?'

'Yes.'

'What did you say?'

'I didn't answer.'

'Why?'

'It was not my place to give you permission to do that. You were a free man.'

'Fact.'

'Why didn't you? Sleep with her. If you kissed her, you might as well have f…'

'I was already too in love with you to sleep with anyone else but you.'

'So why did you kiss her?'

'I didn't kiss her. She kissed me.'

'That bitch.'

'Do I detect a little jealousy there, Mrs. Castle?'

It was her turn to be quiet.

'She said she had to sleep with you in the name of research.'

'Research?'

'For her part, Castle. Rook hooked up with Nikki, and she said that if I was Nikki and you were Rook, she had to sleep with you in the name of character research.'

'Makes sense.'

That won him a smack in the arm.

'What? It does make sense.'

'Then why don't you go sleep with her so she can play the Nikki part right.'

Kate got up from the bed furiously and walked to the bathroom, being stopped by Castle.

'I. Could. Never. Would. Never. Will. Never. Sleep with anyone else but you. I love you, Kate. Thought that, with the wedding and all, you'd have figured it out by now.'

She was still looking like she was mad at him, even though he was looking at her with his puppy eyes and with his hands around her waist, pushing her against him.

'She kissed me on the elevator.'

'To which, if I remember correctly, you ran to share with her.'

'I was just excited for the whole book turning movie thing. It's not every day that you have one of your books turned into a movie, and get to talk to a famous movie star like Nathalie. Besides, I've told you, I would never sleep with her. I already loved you, Kate. I was already wrapped around your little finger.'

'But you still kissed her.'

'Are you seriously giving me a hard time for kissing one woman all those years ago? Besides, I was only attracted to her because she looked like you, she dressed like you. She even copied your gestures.'

'But you were attracted to her.'

'Only because she looked like you.'

'So if I had a twin sister, you'd be attracted to her too?'

'No. Kate. No. I love you, Kate. I really do. I already did. I fell in love with you the moment you told me you needed to ask me a few questions about the murder that night.'

'You're exaggerating.'

'Ok, it wasn't really at that moment. But during the interrogation. The first, not the second one. The moment you said I wouldn't want to be the guy that made your life harder, I decided I'd be the guy who would make it easier.'

'That's sweet of you, but I don't think you were falling in love with me, you were just trying to get into my pants.'

'And I have arrived to the destination, haven't I?'

She blushed and pat him on the shoulder again.

'You are such an ass.'

'But you love me anyway.'