Thanks to everyone who has added this to their story alerts or favorites.

The actually undercover part should start in the next few chapters but first I'm going to have a bit more fun with the build up :)

Beckett and Castle looked at each other, and Castle could see that Beckett's eyes were full of panic. There had been a reason they hadn't told the guys about how they distracted the guard to come in and get them, Beckett had been with Josh at the time and talking about it would have made it real and complicated their partnership.

Beckett threw a quick look around the room. In the kitchen Martha and Gibbs were still working on the food but they weren't talking and Beckett could tell that Martha at least was listening to what was going on. Abby, McGee, Ducky, Ziva and Tony were all watching them with interest, obviously wondering why this was such a big deal and what the two of them were going to say.

Beckett glanced back at Castle then, after giving Lanie a quick glare, turned to the boys and said, "Yes we kissed, problem with that? It did save your lives."

Ryan and Esposito looked slightly shocked and out of the corner of her eye she could see that Castle saw smirking.

"No Beckett, that's fine," Esposito said, recovering faster than Ryan. He smiled then turned to Lanie, "So does that count as a win on the bets or not?"

Beckett growled then Ryan asked, "Hang on; during on that case weren't you with Josh?"

Beckett scowled, "Now do you see why we didn't tell you."

Ryan and Esposito nodded then in a stage whisper said, "Looks like mom and dad are closer than we thought."

The NCIS team all laughed along with Ryan, Esposito, Lanie and Martha, while Beckett glared at Ryan and Esposito, giving them a look that she normally saved for uncooperative suspects.

They all stopped when they heard the door open and a voice say, "Dad, you here? Oh hi," Alexis said, turning and seeing the group of people gathered in the loft.

"Hey pumpkin," Castle said, walking over and hugging his daughter, "Good day with Paige."

Alexis nodded, "Hey Beckett, Lanie, Espo, Ryan and Grams."

"Hey kiddo," Martha replied from the kitchen.

"Hey Alexis," Beckett said, "And what have I told you about calling me Beckett?"

Alexis smiled, "Not to Kate." She turned back to her father, raising her eyebrows in question.

Castle smiled, "Alexis I'd like you to meet, NCIS Special Agents, Tony DiNozzo, Ziva David, Timothy McGee and Gibbs." As he spoke he pointed them out and Alexis gave them all a smile. Castle continued, "ME Dr Mallard."

Ducky nodded, "Call me Ducky please."

Alexis smiled back and Castle continued, "And their forensic scientist Abby Sciuto."

Abby waved and Alexis smiled again before saying, "I love your plaits."

"Thanks," Abby said beaming.

Alexis looked around then back at her father, "I've got some work to do so can you call me when Grams is ready to poison us?"

Castle smiled and nodded while Martha stood in the kitchen and said, "Hey, anyway if anyone is going to poison us its Jethro, he's in charge of the salt."

Alexis threw a questioning glance at Castle who shrugged and said, "I'll explain later."

Alexis kissed him on the cheek and then made her way up the stairs and into her room but as she got to the door she turned and said, "Dad next time you kiss Kate, make it count." She walked into her room and shut the door leaving a speechless Castle, a blushing Beckett and everyone else in stiches.

Looking at Beckett, Lanie said, "As I was saying, before I put my foot in my mouth."

"Got that right," Beckett grumbled under her breath.

Lanie gave her an a apologetic look before continuing, "As I was saying, the two of you are going to have to act like a proper couple, that means calling each other Kate and Rick, not Beckett and Castle, and it means you're going to have to kiss and hug and do all the things I know you hate when the other one is doing it with someone else."

Castle and Beckett looked at each other then quickly looked away, Beckett remembering how she had felt when Castle had left for the summer with Gina and Castle remembering all the time he'd seen her with Sorenson, Demming and Dr Motorcycle Boy.

"Thought so," Lanie said, seeing their faces.

"The point Lanie?" Beckett asked, wringing her hands together.

"The point Kate," Lanie said, "Is that starting now, the two of you," she glanced at Tony and Ziva, "And the two of you," she looked back at Beckett and Castle, "Need to start acting like a couple so you have a bit of practice for tomorrow."

Tony and Ziva looked at each other quickly and Tony patted his lap. Ziva threw a quick glance at Gibbs, who nodded slightly and Ziva slipped off the arm and onto Tony's waiting lap. She shifted slightly to get comfortable and then when she stopped moving Tony wrapped his arms around her waist. Ziva sat stiffly for a moment, before relaxing into him, loving the feel of him around her.

Beckett and Castle glanced at each other and shared a knowing look, the two of them could see just how comfortable Ziva and Tony were with each other and how much they meant to each other just by watching the way that Tony had his arms protectively round her waist and how she was leaning back into him. Beckett then looked at Lanie, who was watching the two partners expectantly.

Castle smiled then bent and whispered in Beckett's ear, "Can I talk to you for a minute?"

Beckett looked him in the eye, wondering what he wanted to talk about then, after a quick look at a smirking Lanie nodded and stood. Castle walked towards his office, Beckett following behind. Once in the office Beckett opened her mouth to ask what was up but Castle put a finger to his lips and shut the door before turning and walking into his bedroom. Wondering what the hell he could possible want to talk about and where the hell he was planning on talking to her Beckett followed slowly. She walked into his bedroom and looked around. His room was simple and his bed massive and Beckett deduced that it was probably impossibly soft. Raising her eyebrow, asking if she could talk yet, she looked at Castle once more. Shaking his head Castle walked to the wall opposite the door that led back into the lounge and pushed on one side of the bookshelf that stood there.

Beckett opened her mouth to ask what the hell he was doing but then shut it again when the bookshelf swung on a central pivot revealing a room behind.

"Shut the front door, you actually have a secret lair."

Castle looked at her and gave her a million watt smile. He stepped to the side and waved her through. Once she had passed him he pushed the bookshelf back into place.

She looked around the room and smiled. It was simpler than Beckett would have expected but she could tell that it was a room for Castle and Castle alone.

She walked over and sat on the sofa, looking around as she went. From where she was sitting she could see a bookshelf covered in comic books and from what she could see a load of action figures. She shook her head and looked at him, "So Castle, two questions, one, what did you want to talk to me about and two, why did you bring us in here?"