So this is the last chapter. I hope you like it :D

They came out of the office and while Tony, Ziva and Kate made their way back to their table Castle went to the bar and spoke with Moe. Instead of sitting back down Kate, Ziva and Tony picked up their drinks and stood, leaning against the back of chairs.

"What were you talking about?" Abby asked.

"Stuff," Tony answered, smiling at Ziva, "Kate and Castle wanted to repay a favour."

"Oh," Abby asked excitedly, "What favour?"

"Getting us together," Castle answered as he came to a stop behind Kate.

That peeked Abby's interest. "Repay a favour how?"

Tony and Ziva looked at each other and smiled before looking at Gibbs. He saw the look and said, "I take it you're ignoring rule 12?"

The two nodded and Gibbs smiled, "Fine, love doesn't count as dating anyway."

Castle laughed, "Told you so."

Abby squealed before jumping up and hugging both Tony and Ziva, jumping up and down as she did so. McGee smiled at them and said, "Congratulations."

Tony and Ziva smiled back at him then everyone looked at Castle when he said, "Come on, it's all set."

Abby let go of Tony and Ziva and asked, "What's all set?"

Castle just shook his head and took Kate's hand. By the bar the second bar tender was stepping onto the slightly raised platform. "Right, tonight is karaoke night and it is my pleasure to introduce the owner of this bar, Rick Castle and his friends, detective Kate Beckett and NCIS Special Agents Tony DiNozzo and Ziva David."

Castle and the others made their way forward while the group left at the table all cheered and whistled.

Castle stepped onto the stage first and held out his hand for Kate, she smiled at him and took it. Tony and Ziva took each other's hand and stepped up behind them.

Castle set up the machine and handed everyone a mic. Before he pressed play though he said, "Ok, Ziva and Kate do the girl part; we're doing the guy part."

Kate laughed, "I think that one we could have figured out ourselves Ricky."

He stuck his tongue out at her then started the machine. As the opening music started Kate and Tony laughed while Ziva looked confused. Tony saw the look and still smiling said, "When we get back I will introduce to the film Greece."

Ziva nodded then laughed as Tony and Castle started singing.

I got chills.
They're multiplyin'.
And I'm losin' control.
'Cause the power
you're suplin',
it's electrifyin'!

Their voices weren't as high as John Travolta but they still sounded pretty good. Over at their table their friends were all laughing and cheering, except Gibbs and Ducky who were just sat smiling.

Ziva and Kate then sang,

You better shape up,
'cause I need a man
and my heart is set on you.
You better shape up;
you better understand
to my heart I must be true.

Nothin' left, nothin' left for me to do.

Everyone in the bar joined in with the backing for the chorus

You're the one I want
(you are the one that I want), o, o, oo, honey.
The one that I want
(you are the one that I want), o, o, oo, honey.
The one that I want
(you are the one that I want), o, o, oo, honey.
Oh, yes indeed.

The boys were dancing across the stage and generally mucking around while Ziva and Kate were watching with affection clear on their faces.

If you're filled with affection
you're too shy to convey,
meditate in my direction.
Feel your way.

I better shape up
'cause you need a man
I need a man
who can keep me satisfied
I better shape up
if I'm gonna prove
You better prove
that my faith is justified

Are you sure?
Yes, I'm sure deep down inside.

By now the table was on their feet and the rest of the bar was laughing and joining in as Kate and Castle danced and Tony tried to show Ziva what to do.

You're the one I want
(you are the one that I want), o, o, oo, honey.
The one that I want
(you are the one that I want), o, o, oo, honey.
The one that I want
(you are the one that I want), o, o, oo,
The one I need
Oh, yes indeed.

You're the one I want
(you are the one that I want), o, o, oo, honey.
The one that I want
(you are the one that I want), o, o, oo, honey.
The one that I want
(you are the one that I want), o, o, oo,
The one I need
Oh, yes indeed.

You're the one I want
(you are the one that I want), o, o, oo, honey.
The one that I want
(you are the one that I want), o, o, oo, honey.
The one that I want
(you are the one that I want), o, o, oo,
The one I need
Oh, yes indeed.

The song ended and the bar cheered. Kate, Castle, Tony and Ziva all bowed before handing Castle the mic's. the four jumped off the stage and came over to the table, all four laughing and smiling.

The table all clapped and cheered as they got closer and the four bowed again.

"Karaoke is going to have to become a regular thing," Lanie said as someone else got onto the stage.

Castle nodded and smiled at Kate, both looking flushed, "Yeah, I think it will."

The rest of the night was spent with everyone laughing and everyone went up on stage and sang at least once, even Ducky and Gibbs gave it a go, Gibbs after a lot of sweet talking from Abby.

Tony and Ziva hardly left each other's side while Kate and Castle commandeered the corner of the booth and Kate sat on Castle's lap, the two whispering and laughing with each other. Lanie, Ryan and Esposito watched happily, none of them had seen Kate this happy and free since they'd known her.

When they finally called it a night around two in the morning, Gibbs had driven Ducky back to their hotel before midnight, they were all getting close to very drunk but since it was the weekend and the detectives had it off none of them really cared. The NCIS team hadn't drunk quiet so much as they knew that they had a flight tomorrow but they had drunk enough to being decidedly unsteady on their feet.

Everyone was wobbling slightly as Castle locked up, he had sent Moe and the other tender home when Gibbs and Ducky had left, and they made their way to the side of the road, to the waiting cabs. Castle had called for some from inside the bar and everyone was glad of that given how deserted the streets were.

They said a goodbye to the NCIS team, all exchanging numbers and promising to keep in touch, they'd all made friends over the short time the team had been in New York but none more so than Kate and Castle with Tony and Ziva.

One everyone had gotten into the waiting cabs and driven away Castle helped Kate into the last cab. He gave the driver her address and sat and back and watched the streets go past, every so often stealing kisses but after the cabbie tutted at them a few times they stopped and just sat with their arms around each other.

When they reached Kate's apartment she looked at Castle and asked, "Do you want to come up?"

Castle thought for a moment, "You sure?"

Kate nodded and slid out of the cab. Castle paid the driver and got out behind her. The two put their arms around each other and supported each other's wobbly steps into Kate's building.

Tony and Ziva got into their cab along with McGee and a very giggly Abby. They gave the guy the address for their hotel and all sat talking quietly. Tony and Ziva were staring into each other's eyes, finally able to show their love on their faces.

When the cab stopped at the hotel Tony paid and they all got out and walked, unsteadily, into the foyer and into the lifts. Tony and McGee had been sharing a room, while Ziva and Abby were sharing another one. One look at Tony's face told McGee everything he wanted to know. Once the lift stopped McGee took Abby's arm and led her to his and Tony's room. Tony and Ziva smiled after them and Tony said, "Thanks McGoo."

He just waved his hand and said, "Remember we have a flight to catch tomorrow."

Tony nodded and put his arm around Ziva before saying back, "We're only going to snuggle McGee, I want our first time to be at home."

Both McGee and Abby clapped their hands over their ears and started humming loudly. Tony and Ziva both laughed and watched as they went into their room, hands still over their ears. Tony and Ziva looked at each other and smiled again. Ziva silently let them into her room and shut the door.

And there you go, hope you liked it. No idea why I chose the Grease song but hey there you go and I think it actually goes quiet well.

Anyway, thanks for everyone who has stuck with this the whole way through and to everyone who has joined in along the way.