"Nice bro" Esposito said slapping Castle on the back "Is she hot?"

"Duh, she's a model of course she is."

Beckett sat there at her desk thanking her lucky stars that their cover wasn't blown. She really did love Richard Castle and he is very good at making things up on the spot. Ryan and Esposito seemed to be satisfied and believed Castle's lie so they went back to their desks chatting away. Thank you Beckett mouthed to Castle with a big toothy grin. "Also Beckett, I think you are going to owe me more handshakes because I think I just worked out who the killer is." Castle said winking at Beckett.

"Well look at you go, Detective Castle. Hmm that suits you Castle." Beckett said laughing.

"Why thank you, aren't you going to ask me who the killer is?"

"Fine who is the killer?"

Beckett sat as Castle explained his theory and Beckett was shocked it was such a grounded theory "Thinking like a cop." Beckett accidently thought out loud.

"What was that?" Castle asked.

"Nothing, great work Castle we'll go and arrest our guy. I'm impressed."

"Well all this time I've spent with you, you must be rubbing off on me."

"Who would've thought…?" Beckett said as she got up and began her preparations to make the arrest. "You coming Castle?"

"Huh, yes!" Castle quickly jumped up and followed Beckett, Esposito and Ryan to the elevator.

As he got into Beckett's car Beckett whispered in Castle's ear "I know why you weren't concentrating before, you were staring at my ass. I've told you not to do that in public."

"Oh please Beckett, and anyway the others all think I'm dating a hot model. Besides I'd be happy to let you spank me tonight."

"Oh you're good Castle. If you keep being a good boy for the rest of the week and don't blow our cover I might pull out that kinky box of mine and yes before you ask it might involve handcuffs."

"Oh Kate you are a tease. How am I meant to concentrate for the rest of the day, let alone the week now?"

"Oh I know I'm mean Castle but I promise you this will be worth the wait." Beckett said in a sultry tone.

….

After they got a confession out of the killer Castle and Beckett were giving Gates the final details of the case. "Thank you Detective Beckett for closing another case." Gates said.

"Actually sir, it was Castle who worked out who the killer was." Beckett said, hoping this would improve Gates feelings toward Castle.

Gates took off her glasses as she said "Really, is that true Mr Castle."

"Yes sir." Castle said.

"Hmm… well I hope you are still searching for those two Gemini dolls of mine you broke."

"Of course."

As Beckett and Castle walked out of the office Beckett said "Seriously? You're actually searching for these dolls?"

"Uh yes, you have seen the looks she can give right? I swear those looks could actually kill someone."

"So I'm coming back to yours?" Beckett asked collecting all her stuff.

"Of course and we will be undisturbed as Alexis is gone and mother is off on some beauty retreat. I'll make you dinner."

"Oh I look forward to it Castle."

….

Castle and Beckett just finished eating a lovely dinner that Castle cooked. "Mm, Rick that was so good how did you make it?"

"Well Kate, I don't give up my recipes that easily."

"Oh well I'm sure I can pay you back." Beckett said teasing Castle as she began to unbutton her shirt.

"Oh really?"

"Yup, I think you'll get the better end of this deal." Beckett said as she revealed she was wearing a lacy black bra.

"Oh it's yours!" Castle said as he picked Beckett up and carried her to the bedroom, kissing her along the way.

Castle was lying on his back and Beckett's head was resting on his bicep, both of their breathing was still fast. "Oh god Kate, you're really amazing."

"You're not so bad yourself Castle."

"You don't think the others are beginning to suspect that we might be together?" Castle asked.

"Oh look who has changed their tune," Beckett laughed "I don't know, let's just say that we are going out with people to get them off our backs."

"Yeah, good idea. Well Ryan and Espo think that I'm dating a model… Kate you do know that they will have to find out sooner or later right?"

"Yeah I know, I'd just prefer later… I don't know what Gates would do if she found out… she'd probably kick you out or I might get fired."

"It won't get to that then, okay? I'm willing to do anything to protect us because this is the happiest I've been in my life and I love you so much Kate… so, so much."

"Rick, that's so sweet. And yeah, I think this is the happiest I've been in years, I finally feel like I'm beginning to know who I am again… I love you too Castle."

Castle had the biggest smile on his face as he reached in and started to kiss Beckett.

….

At eight a.m. Beckett's phone rang, there was a murder. Luckily Castle and Beckett were out of bed and ready today. "I take it there's been a murder." Castle said walking into the bedroom.

"Yeah… listen Rick; you don't have to come today."

"Kate what's wrong?" Castle said walking over to Beckett.

"It's a kid who has been killed Castle. She's only seven. These cases are always hard."

"Oh god, well I'll be coming Kate and I'll be there the whole time supporting you, we'll solve it together." Castle said pulling Kate into a hug.

Castle and Beckett arrived at the crime scene together, and nobody even noticed. Beckett took a deep breath and quickly squeezed Castle's hand before she went over to the body. "Don't forget I'm here for you Kate." Castle said before they walked over.

Everybody was quiet and working hard today trying to solve the murder and so far they had gotten nowhere. It was horrible that morning when Beckett and Castle had to tell the little girl's parents. Beckett couldn't remember the last time she had felt so horrible. Even Castle was acting normal and didn't even have any theories as to why she died. Beckett's phone rang breaking the silence, it was Lanie, and there was another body. Just before Beckett hung up the phone Lanie said "Kate honey, don't bring Castle with you and just prepare everyone for a gory murder scene."

Beckett told Ryan and Esposito to go ahead, now all she had to do was break the news to Castle that he couldn't come. "Rick don't come, Lanie just said you don't have to see people murdered like this."

"I'll wait outside then; I'm not leaving you alone through this Kate."

….

When they arrived at the warehouse where the body was Ryan was standing outside looking really pale and Esposito looked like he had seen a ghost. Castle gave Beckett a reassuring look as she went up to Ryan and Esposito and walked into the warehouse with them.

Beckett came out a few minutes later and looked pretty similar to what Ryan and Esposito were looking like when they arrived. Castle ran towards her "Kate is everything okay?"

"Oh god Castle, there is so much blood… poor Lanie… all different parts of the body to collect…" Beckett buried her head into Castle's chest.

Castle wrapped his arms around Beckett wishing he could just protect her. "Kate… Kate… it's alright, we'll find this killer together and bring justice to their families. I promise I won't ever leave your side."

Beckett burrowed further into Castle's chest "We have to head back to the precinct and tell Gates. I think she'll become involved in solving this case too."

"Okay, I'll drive. Then I'm taking you home Kate."

And for once Beckett didn't say anything and she let Castle take the lead.

I hope you all enjoyed this chapter, I just really wanted to show an affectionate side of Castle and I know there isn't much about hiding their relationship from the others but this is how it turned out! Hopefully I'll update soon and some of the next chapter will be very exciting! ;)