A/N: Thank you guys for reading and reviewing! It means the world to me! This is the last chapter to this fic, but I will post one more chapter where you'll find the link to the first chapter of the sequel. I hope you enjoy it and reviews are much appreciated!

The next day…

Normally Beckett wouldn't go into work on a Sunday morning, but the precinct was short staffed with the flu going around so she really didn't have a choice. She was upstairs getting ready for work. Castle was going to stay home with Katie, whom Gina was picking up that night.

Beckett came down the stairs. Beckett threw on her coat.

She bent down and gave Katie a tight hug. Her eyes became moist. She was really going to miss her. "I'll see you soon okay, Katie?" The little girl only nodded sadly.

Beckett stood up gave Castle a quick kiss and opened the door to leave. She took one step out the door and felt two tiny arms wrap around her leg. She looked down only to see Katie hugging her leg.

"Please don't go, Kate!" Katie said, tears streaming down her face. The sight broke Beckett's heart. She looked at Castle. He bent down and pried the girl off his girlfriend's leg. Katie was crying and screaming hysterically, repeating, "Nooooooo, Kateeeee!" over and over again. She squirmed in Castle's arms.

Beckett and Castle looked back and forth between the girl and each other. Beckett tightened her lips to ensure that she herself wouldn't start crying.

"What should we do?" asked Castle desperate to quiet the girl's sobs.

Beckett sighed. She walked towards Castle and Katie practically jumped into her arms.

"I'll take her to the precinct with me now, you shower up and meet us there," replied Beckett, calmly.

"You sure?"

"Do you really have a better idea?" Beckett said, slightly annoyed at the delay.

Castle raised his eyebrows in compliance and closed the door as Beckett walked down the hall, carrying Katie on her hip.

At the precinct…

Beckett and Katie walked out of the elevator. Beckett lifted Katie up to sit in Castle's chair and then sat down in her own.

Ryan and Esposito walked over, their gazes fixed on the little girl.

Simultaneously, Ryan and Esposito looked at the girl, then at Beckett, then back to the girl, then back to Beckett, in awe of the uncanny resemblance.

"Beckett, is there something you've been hiding from us?" asked Ryan.

Beckett smiled in amusement. "This is Gina's niece. Gina left her with Castle for the weekend. She wasn't too happy when I tried to leave for work, so I decided to take her with me," she said, smiling at Katie. Katie smiled brightly back at Beckett.

Esposito walked over and squatted next to the little girl. "Hola chiquita. What's your name?"

"My name is Katie."

"Nice meeting you, Katie."

Becket smiled warmly at the exchange.

"Alright, so what do you have for me?" Beckett asked Ryan and Esposito. Esposito stood up and walked back over to Ryan.

"Well…not much. I mean we did find a few bank connections, but probably nothing that affects the case," replied Ryan.

Beckett put her face in her hands, sighed, and said, "Alright, just tell me when you find something."

"Will, do," replied Esposito as he and Ryan walked to their desks.

Just then, Castle walked in carrying three paper cups. Beckett smiled as he approached her.

"Coffee for you," he said handing a cup to Beckett, "Coffee for me," he rose his cup, "And hot chocolate for you," he said, handing Katie a cup.

Castle and Beckett smiled as the little girl slowly slurped her drink. Her feet dangling above the ground as her legs hung over the edge of her seat. She had a huge smile on her face.

Then, all of a sudden, they heard the Captain whisper, "Castle! Come in here, someone wants to see you."

Castle looked into the window of the Captain's office and saw the mayor sitting at Montgomery's desk waving back at him.

"I'll be right back," he told Beckett. He walked into the office, closing the door behind him.

Beckett watched her boyfriend schmoozing and talking to the mayor. She laughed to herself. Then she looked at Katie, who was staring back at her.

Beckett picked up her cup to take a sip of coffee. As she did this, she noticed Katie did the same thing. She lowered her arm, followed by Katie lowering her arm. She raised then lowered, raised then lowered all the while being copied by Katie. She smiled. Katie smiled.

The mayor walked out of the Captain's office, greeting everyone on his way to the elevator. Castle and Montgomery were still laughing in the office.

"Can I see what you're doing?" Katie asked Beckett, referring to the paperwork she was trying to fill out.

Beckett smiled and said, "Sure, come here."

Katie leaped off the chair she was sitting in and took a few short steps towards Beckett. Beckett lifted Katie up and sat her on her lap.

Castle and Montgomery were watching and smiling at the sight. Beckett was explaining something to Katie who was in complete awe by the detective's every move.

"She's really great with her," Montgomery said to Castle about Beckett.

"She sure is," Castle beamed, "I can't wait to see her with our own…" Castle didn't finish his sentence, hoping the Captain would ignore the words that had just left his mouth.

"Castle, you know you're not gonna find another Kate in this world. For the past almost four years now, I've sat on the sidelines watching the two of you. The only thing I've seen move slower than your relationship is a criminal signing a confession. Now in the past, she's been with other guys. Now you'd have to be braindead to not notice how it upset you. That always stood in your way." The Captain paused. Castle was processing everything the Captain was saying. The two men stared through the office window at Beckett and Katie laughing at her desk. Castle chuckled to himself.

"But now, Rick. What's holding you back? What are you waiting for? Another guy to come and sweep her off her feet. She cares about you, Rick…a lot….but that doesn't mean she's gonna sit around another three years waiting for you to make your next move. Rick, I have three words for you, 'Go get her.'" The Captain smiled. Rick nodded with a smile and turned back to look at Beckett once more before leaving the office.

A few minutes later…

"Hey," he said, walking towards Beckett.

"Hey," she replied, "What were you two talking about in there?"

Castle smiled warmly at her. Her brow furrowed slightly, but she smiled back at him.

"I just got a text from Gina saying she's gonna stop by in about two hours to pick Katie up."

"Alright then," Beckett began, "Katie it looks like we only have a little time left before you have to go."

"But I don't wanna go with Auntie Gina. I wanna stay here with you," Katie said innocently.

"Aw, sweetie," Beckett said, "You have to go with your Auntie Gina, she misses you a lot." Castle smiled at this. She was completely comfortable talking about his ex-wife in a positive light.

"But I promise you this. You can come and visit us anytime you want," she finished.

Castle's heart fluttered when she said us.

"Why don't I run out and bring us some lunch," Castle offered.

"That sounds good, babe. Thanks," Beckett replied. Did she just call him babe at the precinct? She looked around to make sure no one heard.

Castle walked over to the elevator. Beckett leaned back in her chair, and Katie leaned back on Beckett. Beckett looked down at the little girl and smiled.

XxXxXxXxXxXxXxXxXxXxXxXxXx

Castle was walking down the busy New York street. He had just gotten off the phone with Remy's. He was on his way over there now to pick up his order, but he had a stop to make first.

Castle turned and opened the door to a boutique. Cartier, to be more specific.

"Ahhh, Mr. Castle," a saleswoman said in her native French accent.

"What brings you here today?"

"Hello, Jacqueline. How are you?" Castle replied. He had been there many times to by little gifts for the many women in his life.

"I'm well and you?"

"I'm doing great actually," he smiled.

"So what can I help you with today?" she repeated, "A bracelet, a necklace, earrings perhaps?"

Castle chuckled, "Um, no. Actually, I'm here to buy a ring."

Jacqueline gasped. "Mr. Castle, are you finally going to marry that detective of yours?"

"Well it depends if she says 'yes,' but I'm sure hoping so," he laughed nervously.

"Well, we have a lovely selection of engagement rings. If you could please just follow me to them."

Castle followed her.

XxXxXxXxXxXxXxXxXxXxXxXxX

Castle walked back into the precinct, carrying two brown paper bags filled with their lunch.

"Oooo that smells yummy!" exclaimed Katie.

Beckett smiled and said, "Rick, let's go eat in the break room."

Beckett stood up and carried Katie on her hip.

Castle was staring at Beckett.

"Castle, what is it?" she asked.

In a delayed reaction, he replied, 'Oh..i- it's nothing,l-let's just go eat." They walked into the break room.

A/N: So again, I hope you guys enjoyed this story! And don't forget, the next chapter I post to this story will just be a link to the sequel. Thanks for reading and reviewing!