A/N: I've been working on this one for a while. I've got four chapters written so far. I want to thank Creedog for beta'ing this one for me!

Title: Who Let The Rain In?
Summary: Chuck and Sarah run away together, leaving Casey to track them down and drag them back. With the prospect of Sarah spending the rest of her life in prison and Chuck living in padded cell curtsey of the CIA, they duck, dodge, and try to outsmart Casey, Morgan, and new to the team Agent Kaitlin Buchanan.
Beta: Creedog
Characters: Chuck Bartowski, Sarah Walker, John Casey, Morgan Grimes, Kaitlin Buchanan

Chapter One

Sarah stood with her back to the train station, fear written across her face. This was the most exposed that she had ever felt. Even more exposed than when she had watched in horror as her father was taken from her. This time her heart was on the line, and there was a chance that it might be broken beyond all repair. At least with her father she tried to pretend that she didn't care. After the initial shock of the scene that had unfolded in front of her eyes wore off and the tears in her eyes had dried she was able to stand up on her own two feet and make a life for herself. Even the life she had decided to live was mostly a lie, a cover to hide herself from the world, it was a life she was proud of.

If Chuck didn't show up, if he chose being a spy over her, well that was something that Sarah Walker was certain, that she couldn't live with. If Chuck broke her heart, she knew that it was something that she would never fully recover from.

Bryce had hurt her severely when she thought he had betrayed his country. When she thought he had betrayed her, but he hadn't had the chance to break her heart since she never fully gave it to him. When she had been with him, it was wild and passionate and absolutely carefree, but standing here waiting for Chuck to show up, she realized that she never really loved him. She cared about him, he was...had been her partner after all, but love had never been an emotion that Sarah Walker had ever felt...until now.

She could admit it, if only to herself. He had taken her by surprise that first day in the Buy More. She had thought that it would be an easy task, a piece of cake. She'd infiltrate his life, get the intersect back and return to DC before she knew it. Then she met him, and watched in awe as he so sweetly helped the little ballerina and her flustered father. He had been so sweet when he consoled her when she felt self-conscious about her height.

Sarah thought that maybe that was when her feelings for Chuck went from him being just another asset to being a friend. Someone that would be there after a bad day, when all she needed was a shoulder to cry on, or someone that she could talk to. Even if she hadn't been able to tell him anything very personal, she had wanted too. Seeing the absolute sadness in his eyes every-time she shut him down, broke down her defenses faster than his charming witty personality.

"This is the last call for Berlin."

Looking down at the extra ticket and passport in her hand, she can feel a couple of tears form in the corner of her eyes. Squeezing them shut, she stops them from falling. Sarah Walker does not cry. Not over anyone, or anything...except Chuck. Her mind flashes to the couple of times that she thought that she had lost him, and could feel the same collapsing fear of living a life without Chuck Bartowski. That same feeling overwhelmed her entire self in that moment, as she watched the last few stragglers board the train that both, her and Chuck, were supposed to be on.

Pulling her jacket tighter around her body as the wind picked up, she heard the rustle of papers behind her. Turning toward the offending noise that had brought her back down to Earth, she gasped in surprise. Even though she wanted him to be here, to stand there and hold her close. To tell her that they were making the right decision, that they had no choice. Part of her thought that he wouldn't..part of her didn't want him to show up. As much as she loved him and needed him, his family and friends needed him.

Having that thought come to the forefront of her thoughts she realized how absolutely selfish she was being. To make him choose her, a woman that continually shut down his advances, over his family and friends. Over his sister who had raised him on her own, without any help, and Morgan who had been there for him through all his hard times, especially the whole Stanford and Jill thing. She hung her head, even though she could hear him walking toward her.

She only raised her head back up when she felt his hand touch her shoulder. His touch was so gentle, like he was afraid that if he was too rough she might break into a million pieces. The thought, even with as weird as it was considering her job, was heart-warming.

"Are you okay? Did you change your mind?"

"Chuck..."

Her eyes closed as she fought off a new batch of tears that threatened to fall down her cheeks. If she was going to talk him out of doing this she had to be strong. Tears don't equal strength.

"Sarah...are you crying?"

"No."

She knew it was a lie the moment the word slipped from her lips. Even if she refused to let the tears fall to signal that she was indeed crying, her body shook on the inside from the pain of giving up the one thing that she wanted the most right now.

"Chuck we can't do this. It's not right. You have a family...you have friends. They need you."

"And you don't?"

The pain in his voice, and the hurt in his eyes ate away at the little resolve that she had left. She let her free hand grip on of his hands. Her eyes focused on their joined hands and thought carefully of her next words. She had to talk him into staying, without hurting him.

"Of course I do Chuck. You bring balance to my life, a balance that I've been without for far too long. So yes, I do need you Chuck, but your family and friends need you more. Think of Ellie, Devon and Morgan. What would they do without you? If we do this, if we board that train and leave Prague we'll be considered AWOL...we'll never be able to go back to Burbank. We'll be running from the agency for the rest of our lives. If we ever get caught then I'll go to prison and you'll..."

"Be kept in a top-secret government facility to never see the light of day again. I know. Casey's threatened it enough that I've memorized the words...that doesn't matter though. It's a small price to pay to be with you. Will I miss my family...my friends? Of course I will. It'll be hard, and it will take a long time to adjust. To live my life, unable to see my sister, to be able to talk to her about any, and everything that I need to? To get stupid advice from Morgan that will hurt me more than it helps. I know though that if they knew the circumstances...they would give us their blessing. Ellie wants me to be happy, it's all she's ever wanted for me. You make me happier than I could have ever imagined. You are everything that I ever thought that I wanted, and so much more. I wake up with the biggest smile on my face every morning knowing that I'll get to see you again. Every-time that we kiss...whether it's an accident or not...my heart races, or well more like pounds in my chest…and my palms sweat, which I know is way more information than is needed, but, I love you Sarah Walker, I always have."

Unable to keep the tears in anymore, they start to flow freely, his words so beautifully heart-warming, that he would chose to leave with her and leave his old life behind.

"Please don't cry."

"They're happy tears."

She smiles genuinely at him, and realizes that the only time that she smiles like this...without effort, is when she's with Chuck.

"Good. I don't like to think of you crying. You're not the crying type...You're more of the ass-kicking type."

He smiles back at her, before pressing his lips to hers softly at first and letting the fiery intensity take over. After a few seconds Sarah reluctantly pulls away, her forehead pressed against his.

"If this is what you truly want, then we need to go. The train is going to pull away any minute now."

"Then let's go."

His gloved clad hand grabbed hold of hers and pulled her body into his side so that he could slide his arm around her waist. She handed him his ticket and passport. Without a look back, they boarded the train that was bound for Berlin, with no other thought on their minds than being together, and being happy.

"Colonel Casey."

"Hello General, Agent Walker hasn't arrived just yet. How is Bartowski's training going?"

"That is what I'd like to talk with you about Colonel."

Casey could feel the dread wash over his usual calm. When he really thought about it, he hadn't seen or heard from Agent Walker in a few days. He thought that maybe she was still 'grieving' over the fact that Bartowski was nearly another world away.

"Chuck has not shown up for his training exercise today. He's usually very prompt...When was the last time you've heard from Agent Walker?"

"I don't know, a few days...two or three?"

He honestly couldn't remember. After Chuck had been flown to Prague to begin training to harness the powers that the intersect 2.0 held for him, General Beckman had put both him and Walker in a holding position. She had gone onto say that she was a little weary of breaking up a team that seemed to work better together than apart. Walker had kept in contact with him, waiting for word of their next mission just like him. Slowly her calls became more infrequent until they stopped altogether a few days earlier. He hadn't really thought much of it. Knowing that Bartowski was able to make short calls home to make sure that no suspicion arose of his whereabouts. Maybe Bartowski had called Walker and her lady feelings got her down again. She had been a real sad mess when Chuck boarded the jet that took him especially to Prague.

"Colonel, I'm afraid that Agent Walker and Mr. Bartowski have gone AWOL."

Was he really surprise? Of course not, Bartowski was full of all sorts of 'lady feelings' and though she tries to hide it, Sarah is a lady, so of course she has 'lady feelings' too. It wouldn't be the first time that Bartowski and Walker tried to run away together. He knew what was coming next, and he also knew that it was going to be much different this time. Mainly considering that they left Prague, and could be almost anywhere. Cringing he realized that he was going to need help and he knew who he needed. It pained him to think the words, let alone say them.

"You want me to find them General?"

"Yes Colonel, by any means necessary."

"I was afraid you'd say that..."

"What is it Colonel?"

"This mission is not going to be an easy one. I might need some assistance."

"I'm one step ahead of you. I have a special agent on their way out to your location."

"I meant...special assistance. Someone close to Bartowski, who knows how that loser nerd thinks...I need Morgan Grimes."

The look of disgust on the General's face was almost priceless, and if Casey's face didn't mirror her's almost exactly he probably would have chuckled...on the inside at least.

"I don't like this Colonel. If you bring Grimes in, he'll know the asset's secret. Can he be trusted?"

"Unknown General. He's a wild-card, but he is the best chance we have to find Walker and Bartowski. He knows how Chuck thinks. If anyone can find him, it'll be Grimes."

"Fine, but it's your job on the line Colonel. Just remember that."

Without one more word the screen went blank. With a frustrated grunt, Casey made his way through the underground castle, toward the Buy More. He needed to get a nerd's help. If he didn't find and capture Walker and Bartowski, like the General had said, it was his job on the line.