I daydreamed this idea up a little while ago and thought it was a pretty decent story.
Disclaimer: If I owned Castle, we would've never had to suffer through Alexis comparing her relationship with Pi to Caskett's ultimate love story of beating the odds.
Chapter 1
"I don't know Castle, I think I'm leaning more towards the coffee on this one." Beckett said as she disembarked the elevator. "What? Beckett, come on the red velvet was to die for." Castle whined. "I will admit it was good, but don't you think coffee cake is kinda poetic? I mean it just says . . . us." Beckett countered. "Okay, I hear what you're saying and I guess you're right. How about this, we can have the cake be two different flavors and then everyone will be happy." Castle compromised. "Eh, I don't know Castle. Don't you think that's a bit excessive? One cake flavor is enough." Beckett remarked. "Yeah, but we're getting married Kate, we are allowed to be a bit excessive." Castle said trying to convince Beckett. "Let's just keep thinking about it. We don't have to decide right now." Beckett resolved. "Fine." Castle grumbled.
"Yo Beckett!" Esposito exclaimed. "What's up?" Beckett asked. "There's a lady at your desk. She came in about twenty minutes ago asking for you. I told her you were at lunch but she could wait for you. She wouldn't even tell me her name." Esposito explained. "Okay, I'll go talk to her." Beckett replied rounding the corner of the bullpen.
As Beckett caught sight of the woman patiently waiting in Castle's chair, she felt like the wind had been knocked out of her. Kate honestly thought she'd never see this woman again. Yet, here she was at her place of work, waiting for her.
"What the hell are you doing here?" Beckett demanded in a harsh whisper. "I heard you got engaged and I just had to see what man managed to convince Katherine Beckett to marry him." The woman replied seemingly unphased by Beckett's hostility. "Wha- are you actually being serious right now? You have got to be kidding me!" Kate was getting more and more livid by the second. "Katie-" The woman interjected. "It's Kate." Beckett crisply interrupted. A few seconds of tension filled silence ensued and all the while Castle was gaping at the public display looking like an idiot ready to catch flies. He had no idea who this woman was and how she could garner such a furious reaction from his fiancee.
"Come here." Kate exclaimed grasping the woman's wrist and yanking her into an unoccupied interrogation room. Castle and the boys followed and readied themselves behind the glass in the observation room wondering if they would have to intervene between the women at some point. "Kate just listen for a second. Okay?" The woman asked. "Listen for a second?" Beckett asked in disbelief. "I haven't seen you in fifteen years Charlie. And quite frankly, you don't even deserve my acknowledgment." Beckett finished her volume level rising. "I know!" Charlie yelled. "I know. We haven't seen each other in fifteen years and I don't deserve your time of day, but will you please just let me tell you how truly, and incredibly sorry I am. I have regretted what I did for years and I wanted so bad, so bad, to come home, and make it right, but I just didn't know how to do that." Charlie sincerely breathed out. "The truth is I just didn't know how to handle what happened. How to cope." Charlie whispered. "And you think I did?" Beckett replied in a calm tone. "Charlie . . . I didn't just lose my mom that night. I lost my whole family. My mom died, my dad checked out, and you left. You left when I needed my big sister the most." Beckett revealed.
Collective gasps of surprise sounded in the observation room as all three men realized the mystery woman standing before them was Kate Beckett's sister. Someone they never even knew existed.