Title: John Casey Versus Daniel Shaw

Disclaimer: All characters belong to Chris Fedak and Josh Schwartz. If only they belonged to me… oh what fun I would have with a certain Colonel.

Author's Note:Okay well this is the first fanfic I've ever uploaded… I'm not sure whether it's going to be Casey/Chuck slash or friendship yet… well anyways I would love some feed back and constructive criticism! [=

Additional notes:Set sometime in season 3

Summary:Chuck Bartowski the human intersect 2.0. Full time nerd and pat time spy and in Casey's eyes; one big liability. But when Casey and Shaw are ordered to off the human intersect just how far will Casey go to protect him?

Chapter one

John Casey and Daniel Shaw stood in front of the high-def monitor in their secret base 'Castle' as their boss popped up on the screen.

"Agent Shaw, Colonel Casey," General Beckman greeted, "glad you could both make it gentleman."

"Is this to do with a mission without Walker and Bartowski?" Casey asked her eagerly. He was itching for a good mission after a three week dry period.

"Sort of." Beckman replied. "As you know the Ring is after the intersect to create an army of unstoppable agents and Bartowski is the only copy remaining at this time. Recent intelligence has shown that the Ring has discovered Bartowski's real identity."

"So he has to go into hiding?" said Shaw.

"Not quite," continued the general, "it's too dangerous, the existence of Chuck Bartowski is too dangerous. He is a threat to the security of this country."

Casey looked over at Shaw, who too seemed to understand where the general was heading with this, "So you want us to kill him."

"Simply speaking, yes,"

"No!" Casey spoke up.

"Excuse me?" Beckman said turning her stern gaze to one of her most trusted and loyal NSA agents.

"I mean Bartowski is a good kid." Casey sighed; he couldn't believe he was actually standing up for Chuck like this. Two years ago he had been ordered to kill Chuck and he was going to with out hesitation if orders hadn't changed at the last minute. But now as much as he hated to admit it he had changed thanks to the man named Charles 'Chuck' Bartowski. "He doesn't deserve to go down like this, he didn't ask to be a spy yet he's still served his country well and with honour."

Beckman leaned forward in her chair. "Are you trying to tell me that you are going to disobey direct orders colonel?"

"No… But there must be some other way, what about his sister? And Grimes?"

"Sorry," the general lowered her head. Casey knew she too had grown fond of the nerd but when it came to Beckman orders were orders. "You have twenty-four hours or I am going to send in some one else." With that she terminated the connection.

Casey stood staring at the blank screen when he felt a hand rest upon his shoulder; it was Shaw's.

"I'm sorry," said the younger agent. "I know I haven't known him as long as you and Sarah but still…"

Casey shrugged Shaw's hand away. "Forget it; it's the spy's life. This is what I signed up for." He walked over to one of the many weapons cabinets and began to browse in contents. "Just don't tell Walker she'd die protecting the nerd." He knew from the silence that this statement had gotten to Shaw and couldn't help twisting proverbial knife a little bit more. "Because you know she may be dating you but she loves Chuck really, you're probably just the rebound guy."

"Well I wonder what I'll become tonight then once Chuck is dead."

Casey growled at this comment as realisation dawned on him. He managed to keep his cool though, knowing that Shaw probably didn't mean for his words to sound as harsh as they did. Finally Casey took a gun from the cabinet. "I'll do it, I'll off Chuck. Just one shot, it'll be pain free."

"Nah-ah," Shaw shook his head. "I'll do it, I don't know him as well so it'll be easier for me and I'd be doing you a favour."

"Are you questioning my ability Shaw?"

"As an assassin? No. As a cold blooded killer with orders to shoot his best friend? Then yes colonel, I am questioning your ability." Shaw replied.

Casey couldn't argue with this as he knew he'd never intentionally be able to kill Chuck or stand by and watch someone else do it. That's why he raised his hand with the gun in and before Shaw could question this action. It was an easy shot, Casey hit his target. A tranquilizer dart now jutted out from Shaw's neck.

"Casey…" Shaw murmured as he attempted to pull out the dart, but it was too late, the sedative quickly took its affect and he slumped to the ground.

Jonathan Casey was now officially an enemy of the state.

Quickly forming a plan, he text Chuck telling him to meet at his place in half an hour; something to do with a top secret mission. He then handcuffed Shaw's motionless body and dragged his dead weight into one of Castle's several prisoner containment cells, where, once the sedative wore off, the CIA special agent would find himself locked in to until agent Walker returned from her solo mission later that day and would undoubtedly release him with out question.

As he left Castle- probably for the lat time as a free man, he noted- he mentally apologized to Walker. She was the best partner he'd ever had in this line of work and he didn't want to drag her into this. She'd already put her job and freedom on the line once to protect Chuck, from Casey. Now it was Casey's turn to protect Chuck from Shaw, it was much like a viscous circle. Casey thought of the irony; when he was first assigned to protect Chuck he wanted nothing more than to get rid of him. Now those were his orders; to get rid of Chuck for good, but he wanted nothing more to protect him.

And he would, Casey promised himself. Even if it killed him.