"You know what else this report tells me?"
She shrugs, "That you hate me?"
"I never said that I hate you."
"So what does the report tell you?"
"Gender."
"Oh."
"Do you want to know?"
"No. Just tell me what the paternity results are," Kate insists.
"That the candidate is without a doubt the father."
She furrows her brow, "What?! You're sure?"
He re-reads the results, "Yes."
"You're certain?" she questions.
"You sound surprised. Why do you sound surprised?" He wonders.
"I was just so sure," she responds.
"I only see one candidate for paternity here," he points out.
"I know."
"So who is the sample from? Esposito. It is from him, isn't it? It's his baby? You never took a sample from me."
"I still have your toothbrush," she reminds him.
He furrows his brow, "What?"
"The sample I sent was from your toothbrush."
"So you're saying that the baby is mine?"
"If it confirms paternity, yes."
"This is great news. This just proves that my theory is right."
"What theory?"
"Actually it is Alexis' theory."
"Theory about what?"
"She thinks someone wanted to break up our relationship. Somebody wanted to get me out of the picture. They used 'Sito's weaknesses against him. They blackmailed him. It explains everything. It explains why he showed up at your place with a bottle of tequila. It explains why you can't actually remember sleeping with him. All of it makes sense."
"What are you saying?"
"I think the reason you can't remember sleeping with Esposito is because you didn't. He was supposed to seduce you. It was part of the plan to end our relationship. He couldn't go through with it. He couldn't betray us like that, but he had to find away to hold up his end of the bargain so his loved ones wouldn't be taken away from him. He had to convince the blackmailer that he did sleep with you."
"The blackmailer? Who would do that, and why?"
"I don't know who. The why, is that we are stronger as a team than we are apart."
"So?"
"Someone wants you to be vulnerable. They don't want you to find out your secret. Someone close to you."
"Who?"
He shrugs, "I don't know, but it has to be someone here."
"Do you have any idea how unrealistic your theory is?"
"Why don't we pretend for just a moment that there is no conspiracy?"
"I won't be pretending," she answers, dryly.
"Maybe I can believe that somehow you, and Javier both had a change in character long enough to have a brief sexual encounter. That is rather unbelievable, but for argument's sake we will just say I do believe it. For Esposito's part of the plan to work he would have to convince you something happened. The easiest way would have been for him to leave a used condom, but he didn't. Which to me says nothing happened. I know that, because both of your are intelligent adults. You are cops, and you wouldn't go into a gun fight without a bullet proof vest. One of you would have insisted. I know you, also on another note I would like to point out that I know when the baby was conceived."
"How?"
"It was the same way that I knew you were mine. The night after I proposed, when you told me that you would marry me, do you remember that night?"
"The night after the alleged encounter with Esposito?"
"Yes."
"What about it?"
"We didn't make it to my bedroom."
"Your mother was out of town," Kate recalls.
"Alexis was studying for an exam."
"We barely even made it to the couch," she remembers.
"I don't even know if I locked the door."
"I did," she admits, "and chained it too."
"It was how I knew that you wanted to spend the rest of your life with me."
"Because I locked the door?"
"Because you didn't."
She furrows her brow, "Huh?"
"You remember we were on the couch, and I had one hand digging around in the cushion of the couch."
"Yeah."
"You knew what I was digging for."
"Your strategically placed stash of condoms. Castle it's not the first time that we haven't made it to your room. It certainly wasn't the first time that we only made it to the living room."
"What did you do?"
"I think that is when we ended up on the floor."
"It is."
"You didn't..." she realizes.
"No, and you knew it."
"You're right," she admits.
"I often am."
"Can I see that?" she questions, pointing to the piece of paper in his hand.
He holds it out for her to see, but covers the top portion of the paper.
"Why are you covering that part of the paper up?"
"The results are down here," he shows her.
"I can see that. Why are you covering other portion covered up?" she slides the piece of paper out of his hand. She looks at the top of the paper, and then looks at him, "Oh."
"You just told me you didn't want to know."
"I guess that it is too late now."
"Why is it so hard for you to believe that I might be right about my theory?"
"Who would want to end our relationship?"
"A criminal out for revenge."
"Javi would never agree under those circumstances."
"Someone powerful. Someone capable of carrying out a threat."
"Someone with a secret," she adds, finding herself getting caught up in his story.