A/N: Thank you guys for the great reviews! It really meant a lot that you took the time to give me your thoughts! Enjoy this chapter :D

A couple of months later…

It was a Saturday morning. Sunlight streamed into the bedroom. Castle had his arms wrapped around Beckett. He held her close. They were both sleeping peacefully. They were a little more tired than usual considering the night they just had.

KNOCK KNOCK KNOCK

Castle stirred slightly and opened his eyes slowly.

KNOCK KNOCK KNOCK

Castle sighed and slowly slid away from Beckett so he wouldn't wake her and put on a gray tshirt to go with his navy boxers. His hair stuck up in all different directions as he made his way down the stairs, barely awake.

He opened the door, "Gina?" Then he looked down and saw a little girl standing next to her, no older than four.

"Wha-" Castle couldn't even finish before Gina cut him off.

"Richard, this is my niece, I'm taking care of her for the week, but I have to run out of town for the weekend so could you please watch her for me? Thanks, I owe you one! Take an extra two weeks on your book. Bye!"

Gina left the girl in Castle's apartment along with the girl's overnight bag and ran into the elevator.

Castle stood there trying to process everything that just happened. He looked at the girl. She too looked like she had just gotten out of bed. She was a tiny girl. She came up to about halfway up Castle's thigh. She had wavy hazelnut colored hair and big green eyes. She was wearing a yellow spaghetti-strap sundress and matching tiny, yellow flip flops. She looked very familiar to him. She just stared back up at him with her big green eyes.

He smiled and squatted down in an attempt to match her height, "What's your name?"

"My name is Katie," she replied in a high-angelic voice, "Who are you?"

"My name's Rick," he smiled. "How old are you?"

"I'm three years old," she said except when she pronounced the letter 'r' it sounded like a 'w' so it sounded more like thwee yeaws old. She showed Castle three fingers to make her response clear. "How old are you?" she asked innocently.

Castle opened his mouth to respond, but was cut off by Beckett.

"Rick, what's going on?" she asked as she walked down the stairs. Her hair was down and she was wearing one of Rick's gray shirts. It was so large and baggy that it reached down to her mid-thigh.

She came down the stairs and stood next to Rick.

"And who is this?" she asked in mild confusion.

"Uh…this is Gina's niece. She dropped her off because she needed someone to watch her because she had to unexpectedly leave town."

Beckett smiled and squatted next to Castle, "What's your name?"

"My name is Katie and I'm three years old," again showing three fingers to clarify herself.

Castle watched Beckett as she laughed at the girl's response. She was absolutely beaming with joy as she watched the little girl, causing Castle's smile to grow even wider.

"Well, Katie, my name is Kate," she replied.

The girl extended her tiny arm to shake Beckett's hand.

"Nice to meet you, Kate," the girl said.

Beckett laughed as she shook the girl's hand.

Castle and Beckett stood up simultaneously. They looked down at the girl.

"Katie, did you eat breakfast today?" asked Beckett, her maternal side kicking in.

The girl shook her head, "No, but I'm really reeeeeaaalllly hungry," the girl replied.

Beckett laughed, "Alright, I'll go make you something to eat."

Beckett walked into the kitchen. Castle followed, holding the little girl's hand. He lifted her onto one of the stools at the counter, across from where Beckett was gathering the necessary ingredients for pancakes. He sat next to Katie. The two of them watched Beckett prepare breakfast.

"I have a question," the little girl told Castle, looking up at him.

He looked down at her and replied, "What's your question?"

Katie looked at Beckett, who momentarily looked up and gave her a smile before returning to the food, and then looked at Castle and asked, "Are you and Kate married?"

Beckett laughed to herself. Castle noticed and a wide smile grew on his face.

"No, Katie, we're not married…yet," he replied, keeping his eyes on Beckett, who looked up and smiled in surprise when he said the word 'yet.'

"So you're going to marry her?" the little girl asked.

Beckett smiled in amusement, as did Castle.

"Do you think I should marry her?" Castle asked playfully.

Katie sat up, she could barely see over the countertop, and eyed Beckett up and down. "I think so," the girl said.

"Oh yeah? Why is that?" asked Castle.

"Well, she's really pretty and nice and she can make pancakes," the little girl smiled.

"In that case….I guess I'll just have to marry her then, won't I?" he replied, looking at Beckett. Beckett smiled warmly.

The little girl nodded in agreement.

Beckett served breakfast and the three of them ate while talking about a range of topics all about Katie and what she liked or disliked.

Then, once they finished, Castle said, "I'm gonna go take a shower."

"Okay," replied Beckett. He stood up, walked around the counter, gave her a quick kiss, and went up the stairs.

15 min later…

Castle was walking down the stairs, fresh from the shower, his hair still wet. It was quiet…a little too quiet. Then, just as he reached the last step, Katie zipped by, giggling hard. Moments later Beckett ran by laughing equally as hard as Katie. Beckett caught up with Katie and grabbed her from behind, lifting her up high in the air. Castle could help but smile. Beckett fell back onto the couch and held Katie tight. They were still laughing. Beckett proceeded to tickle Katie, only heightening the volume of the shrills that were heard as Katie giggled.

Castle stood, watching. Kate was beaming. She had the biggest smile on her face and looked so happy as she cradled Katie, the two still laughing.

Then it hit him. Katie looked just like Beckett. They had the same eyes, the same hair. It was a perfect match. It took him to the future. He couldn't wait to see what Beckett would be like with their own children running around the apartment. With that thought, his smile grew even wider.

He walked over to the couch and said, "What are you two laughing about?"

As their laughter quieted, Beckett replied, "Oh nothing." She looked back down to Katie, who was cradled in her arms and the two started laughing hysterically all over again.

"But since you're done," Beckett said moving Katie to sit next to her on the couch, "It's my turn to go shower." Beckett stood up, gave Castle a quick kiss, then proceeded up the stairs.

About 20 minutes later…

Beckett just stepped out of the bath room, when she heard Castle in his storytelling voice say, "And then the magical princess..." She smiled. He was reading Katie one of Alexis' old books.

Then a few minutes later, after she had gotten dressed, Beckett came down the stairs. It was quiet. She walked around to the couch and found that Castle and Katie had fallen.

She smiled. Katie was sitting to Castle's left and leaned on his chest, his arm around her. She snored softly.

She grabbed a blanket and put it over the two. This slight touch woke Castle and he whispered, "Come join us."

Beckett complied and sat on Castle's right side. He put his arm around her and she snuggled into his side as he adjusted the blanket to cover all three of them. They fell asleep.

A/N: I hope you liked this chapter! I was wondering your opinion. This story will eventually go on to them being married and such, so should I just keep adding chapters or end this one and write a sequel? Your feedback is greatly appreciated! Thank you !:D