So i know i didn't give any time for reviews/comments/ anyone to offer tp beta, but i think that this chapter helps develop it more, and in order to decide if you like it you have to at least have chapter two. but thats just my weird brain goin crazy. Hope you enjoy guys!

All regular disclaimers apply.

I ran down the stairs and out of the precinct as fast as I could. I needed to catch up with her and find out who she is. Or who she THINKS she is anyway.

"Sophie! Sophie, wait!"

I caught up to her just as she was stepping into a cab. She was crying...pretty close to sobbing, actually, but managed to answer me.

"Look, Detective, I'm really sorry. I shouldn't have shown up. I just...never mind. I'm sorry. I have to go."

She kept wiping her tears in a futile attempt to compose herself.

"Sophie, I need you to tell me who you are, ok? Can you do that for me?"

I was trying to be gentle with her. She was emotional, after all, and I really didn't want to upset her. It was just kind of difficult to stay calm, given my state of mind at the time.

"I'm..."

She sighed. She was obviously afraid to tell me for some reason, but I couldn't see why.

"I'm not that scary, am I?"

"It's ok, you can tell me. I don't bite."

"I'm your sister, ok?"

"Whoa. Did NOT see that coming."

"Um...wow...ok...I'm just...I don't have a sister."

"Wow Kate. That was harsh. Look at her face. She's gonna start crying, you know. You better calm her down."

"I will..."

"Hurry."

"Ok, ok just relax!"

"Well? SAY SOMETHING!"

"I'm sorry. That was harsh. That's not what I meant. I just mean that...I was unaware that I had a sister..."

"Better call dad later..."

"Will you come back upstairs, please?"

That's when I first saw her smile. That smile...I figured out why she looked so familiar. She looked just like my mother.

…...

We went back to my desk, where Castle was waiting. One look from me told him all he needed to know: it's time to go home.

"Beckett!"

"Bad word choice..."

"Uh, Kate!

"That's better."

"Alexis called, she needs my help with something for school. Science project or something. See you tomorrow?"

"See you tomorrow, Castle."

Once he left, Sophie got settled in his chair, and I sat in mine. I was about to start talking when she asked me the question I hate the most. The question that I always have to answer. The question that I never know how to answer: "Who was that?"

"Oh, Castle? He's my partner. Co-worker. We work together. So, uh, you're my sister, huh? How'd you figure that one out?"

"That sounded a little sarcastic."

"It wasn't meant to be."

"It sounded like it was."

"She didn't seem to notice. Now be quiet so I can listen."

"Well, when I was seven, my dad told me that I was adopted. After that, I was determined to meet my birth parents. It took a while of sneaking around the house when I was alone, but I finally found some paperwork. Well, it was less of "a while" and more like "three years." Anyway, all I found was something saying that my birth name was Sophie Beckett. I had always been Sophie, but they had given me their last name. Anyway, so I was ten when I found that. I only had a last name for my real parents. Just Beckett. So I kept searching. About four years ago, when I was twelve, I finally found a name, and the paper work to match. Jim and Johanna Beckett. I wanted to find out more about them, who they were, what they did, before I tried to find them. I started going to the library every day after school, and that's when I found out about Johanna. I'm really sorry about that, by the way. That must have been hell to go through. Anyway, by this time, I was about thirteen. I was really upset about what I had discovered, so I decided to take a break and stop looking. But when I was fourteen, I met some guy whose first name was Beckett, and that brought it all back. I started searching again, and remembered something from the article. I remembered she had a daughter, Katherine Beckett. I knew you were in New York, but I was only fourteen so there was nothing I could do about it. I got a job, saved up my money, and now here I am."

That was a lot of information for me to take in. Plus she gave it to me in about thirty seconds. But from what I could tell, she was being honest. She at least thought she was telling the truth.

"You were 16 when she was born. You would have known."
"Unless they hid it from me..."

"Seriously, just call dad later."

"You look just like her, you know."

"Who?"

"My mom...or, our mom, apparently. Sophie, do your parents know you're here?"

She sat silently for a moment, looking away, which told me her answer. But still, she quietly responded "No"

"Great, we have a run away on out hands, Kate."

"It's late, maybe we can call in the morning?"

"Or now. They're probably worried."

"Ugh. I hate it when I'm right."

"We need to call them so they know you're safe, ok?"

"Ok, but do you mind if I do it? They'll respond better to me."

"No, not at all. I'll get us some coffee."

I went to the break room and started brewing a pot of coffee. While I waited, I watched Sophie's end of the conversation. She wasn't crying, and she didn't look too upset, so that was a good sign. As I walked back to my desk, coffee in hand, I started talking again.

"What did your parents say?"

"Nothing. I left a message."

"Umm...ok, do you have a place to stay for the night? A hotel room, or..or a friend's house or something?"

"No, I was gonna find a hotel after I came here."

"Alright, then, you'll stay with me tonight. I'll get you home tomorrow. Let's go."

She looked a little cautious, but didn't object. When we got off of the elevator we found none other than Richard Castle walking over to us.

"Castle? I thought you went home an hour ago!"

"I did! I did! I promise! Well, actually I didn't. I got a donut. I was bringing you one! See? It even has sprinkles!"

"Aww it even has sprinkles!"

"No, no aww. Don't aww at him. He's just your partner."

"A donut, Castle? Really?"

"Well...yeah..."

"There's that boyish charm we all know and lo-"

"Know. That's it. That boyish charm that we all know."

"I see. Hey, Sophie, want a donut?"

"Actually, Detective, I brought one for Sophie too. In case she was hungry."

He pulled out a chocolate donut, also with sprinkles, and passed it to Sophie, who ate the whole thing in just a few bites.

"Thank you, sir."

"You're welcome. But please, call me "Mr. Castle." Or just "Castle," or even "Rick." Sir sounds too formal."

"Oh, Sophie can call you Rick? I see."

It was more of a challenge than a statement.

"Yes, in fact, I give everyone that option, Kate," he said, taking a bite of the donut as if to prove his point.

"Hmm, well then, Rick, would you mind stepping aside so we can get home? Please Rick?"

He all but choked on the donut at my last question.

"We?"

"Yes, Rick, we. Me..."

I stepped forward and took a bite of the donut he was holding,and whispered in his ear.

"...and Sophie."

I stepped back and looked at Sophie, who was VERY amused.

"Come on, let's go."

As we left, I heard Castle quietly whisper "Is it hot out here?" before I closed the door and drove off.

So i think that's it for now. It's like 1 AM and i'm tired. too tired to write anything funny here. honestly i can barely see right now. so i hoope you liked it, please review. Love you forever.