Secrets don't last forever.

Summary : Castle and Becket, travel to D.C to help NCIS on a case, Tony/Ziva and Castle/Becket, are together but nobody knows, will this case, bring out their secrets? And whats the connection between the current case and Ziva– rubbish summary, please read!

A/N I know that Ziva is an NCIS agent know, but for this story she still liaisons between Mossad and NCIS, its also just after she was captured by Saleem.

Disclaimer – sadly I do not own NCIS or criminal minds

NYPD- this morning

Castle and Beckett rode up to the homicide floor in the elevator together, they tried to arrive at work at separate times, but today they were both late, after their morning activities, which left them both in a cheery mood, no one knew about there relationship, it was a close call when Ryan and Esposito, had to check Castles phone records, but they never noticed the amount of calls Castle and Beckett had between them.

"You're Late" Gates stern voice from the middle of the bullpen, "Sorry …. My car broke down this morning, Castle had to pick me up" it wasn't the best story Beckett could come up with but she was put one the spot so it would have to do. "Yeah, so what we got guys" Everyone raised an eyebrow at how happy Castle was, it was a weekend, who is this happy to work on a weekend.

"We have another body" Gates got straight to the point, " Expect this one is in D.C and it's a navy seal"

"Bastard" Esposito gladly gave his opion of the murder.

"Yes, but as its in D.C and it's a navy seal, it means that Beckett and Castle will have to go to D.C and help out NCIS" Castle and Beckett suddenly looked up to see if what they heard, was what was exactly said.

"But Castle not even a detective, sir" Ryan complained, "I know that Ryan, but Castles way of thinking could really help with this investigation, Beckett, Castle my office" Gates started to head towards her office.

"I think she's starting to warm up to me" Castle proudly said, "Yeah, in your dreams" Beckett laughed, "Ohh, trust me she's not the one taking over my dreams" Beckett could do nothing but laugh, at Castles seductive voice, "really, who takes over your dreams Castle?" Beckett knew what Castles answer was going to be, but she loved hearing me speak, "Well, Its this gorgeous, brunette, who's got some kick ass detective skills, she's also got a super hot body, and is amazing in the bedroom department" Castles eyes travelling up Becketts body as they made there way to Gates office, "Sounds like a keeper" Beckett glanced back, at Castle and winked. Their relationship was nothing like either of them had, had before its was fun, strong, they fit together like a jigsaw piece.

"As you probably know, when you are working with NCIS, special agent Gibbs, will try and block you out, I have heard from a number of resources that he doesn't like out siders, but please don't be put off by this, just do what you do best, your flight lives in an hour." And with that Castle and Beckett walked out of Gates office towards the elevator, looking forward to being alone, in D.C

NCISCASTLENCISCASLTENCISCAST LENCISCASTLENCISCASTLENCISNC IS - BullPen

It was a typical day in the bullpen, McGee was working on his computer, Gibbs patiently waiting for a call, Tony and Ziva where talking to each other over email, occasionally laughing at what each other had to say.

"Gibbs" Vance called from the balcony, "My office", Gibbs grunted and started to head up stairs.

"Wonder what that's about?" McGee questioned, "Properly some top secret mission" Tony answered while tapping his pen on his chin, while trying to think of what Vance could want with Gibbs now. "He's properly just asking him something" Ziva said while she glanced up from her computer.

"Yeah, you're right, going down to see Abby." McGee stood up from his desk and headed over to the elevator, leaving Tony and Ziva alone in the bullpen.

NCIS – Vances Office

"As you may be aware Gibbs, NYPD, are having problems catching the murder of 3 civilians" Vance's stern voice made Gibbs look at him, "What's this got to do with NCIS?" Gibbs questioned Vance, "Well, we have a Navy seal, with the same MO, as the victims in New York, and because as this, one detective and her assistant are coming to help." Vance saw the angry take over Gibbs face.

"I know you don't like outsiders Gibbs, but we could really do with their help, their going to be here very soon."

"I really don't see why we need their help, you trying to say me team is not capable of catching this guy." Gibbs angry grew by the minute.

"Not at all Gibbs, but they have being investigating this case for over a month now, and they have quite a bit on are murder, so they are going to help whether you like it or not."

"Fine!, but if they get in the way, im sending them right back to New York." Gibbs almost growled. Gibbs went to turn and walk out.

"Gibbs, wait play nice please, we don't want them to get the wrong impression now do we."

Gibbs huffed and walked out.

NCIS – BullPen (While Gibbs is with Vance)

"So Ziva, what do you want to do tonight" the smile on Tonys face grew bigger once her noticed that they were in fact alone.

"Well, I was thinking something very similar to last night" The cheeky Smirk on Zivas face grew as she remembered, what her and Tony got up to last night, " I like the sound of that."

Tony saw the spare piece of paper on his desk, and scrunched it in to a ball, and aimed it at Zivas head, "HEY!, what was that for" Ziva replied while throwing the same piece of paper back, hitting Tony Right on the Nose, "I wanted to see if you still have your ninja skills."

"Of course I do" Ziva laughed as she caught the badly thrown paper ball, "But you seem to like some skills" Ziva winked at Tony, "Well you will just have to see what skills I have" Tony got up from his desk and walked over to Ziva, neither noticed the ping of the elevator doors, and the Pretty brunette and Handsome man step out and head towards them.

"Oh will we now" Ziva smiled as Tony got closer to her, "Oh we will" Their faces getting closer together, "You still realised that we are still at work right" Ziva giggled, "Yes but we are alone" Tony closed the gap between to two, giving Ziva a quick, steamy kiss, only pulling back when they heard a slight cough.

Ziva jumped up from her chair quickly to see who had manage to catch them. Tony and Ziva fell silent when they saw the two onlookers.

"Well that wasn't the welcome we where expecting" The skinny Brunette commented on the moment she just witnessed, "I'm so sorry, just please don't tell any one, what just happened, or we will get are asses whipped." The two visitors stared at Ziva, "I think you mean kicked Ziva" Tony quickly covered Zivas mistake, "Oh that too".

NCISCASTLENCISCASTLENCISCAST LENCISCASTLENCISCASTLENCIS

"Who are you anyway?" Tony Asked the two strangers now stood in the middle of the Bullpen.

"They are here to help us" Gibbs voice stopped anyone answering the question. "Im Special Agent Gibbs, This is special Agent Dinozzo, and that is Officer David, and as Dinozzo said, who are you?."

"We are from NYPD, Im Detective Beckett and this is my assistant Richard Castle, we are here"

"I know why you're here, detective. Where is McGee?" as if on que McGee appeared from the Elevator with Abby. "On your six boss." Everyone looked to where the voice was coming from.

Beckett and Castle both taking in by the dress of the woman walking next to , who they presume was Agent McGee, she was wearing knee high black leather boot, with a rather large heel, a red and black tartan mini skirt, and a tight fitting t-shirt, with a long white lab coat.

"And this is Special Agent McGee and are forensic specialist Abby Scuito." Gibbs introduced the visitors to McGee and Abby.

Gibbs stood facing the Detective and writer, sizing them up, trying to figure out what use they could be to this team.

"Vance said I should go with you to the crime scene Gibbs, to do some quick comparisons, to make sure it's the same guy." Abbys happy voice broke the akward silence and shocked Castle, he really wasn't expecting her to sound so happy.

"Ok, Grab your gear then everyone" Gibbs team Grabbed their back packs and headed towards the elevator, "Are you waiting for an invite, come on you two" Gibbs Shouted at the stunned pair still stood in the bullpen, "Sorry he really doesn't like outsiders" McGee apologised for his bosses actions.

A/N Its not the best I know but please review!