Niece

She was nervous. They were baby sitting for the first time and she had no idea if they could do this. Well, she knew Castle could do this, but she didn't know if she could do this. Ryan and Jenny had a wedding to go to and they asked her and Castle if they could watch Sarah Grace. Before Kate could say yes or no, Castle said yes. So here they were, at the loft, waiting for three month old Sarah Grace.

Even though she wasn't crawling, Castle had baby proofed the loft, bought at least $100 worth of toys, two outfits for her, set up Alexis's old crib in their room, and made sure that there were plenty of Baby Einstein on the DVR. He was excited, obviously. She felt like he was being excited for the both of them while she was being nervous for the both of them. The doorbell rang and Castle practically ran out of his office, knowing it was their little house guest.

"Hey, Castle."

"Jenny, you look amazing."

She gave him a soft smile. "Thank you." She walked inside, with Sarah Grace in her car seat and Ryan following behind her. "Ryan has her diaper bag filled with all the things you'll need. Her blanket, her bottles, her formula, change of clothes, her favorite toy, her pacifier, diapers, wipes, bibs, and burping cloths. Thank you guys so much again for watching her."

Before Kate could speak, Castle interrupted. "It's our pleasure. You too have a great time and don't worry, we know how to contact you if we need to."

Jenny and Ryan smiled, both waving at their little girl. She was currently asleep, so they didn't take her out of the car seat. "You be a good girl for Aunt Kate and Uncle Rick. We love you. See you in the morning." With that, Jenny and Ryan left, leaving Kate and Castle alone with their daughter.

"How long do you think she'll sleep?"

"Hopefully not too much longer. I want to play with that one toy I got her."

She shook her head and took the bottles out of the diaper bag. She placed them on the counter and put the ones that were already made in the fridge. As she was about to move the diaper bag, she saw that Sarah Grace was starting to move in her car seat and sure enough, her eyes soon opened. Kate froze as they both looked at each other.

"Hi baby girl. Did you have a good nap?" She saw Sarah Grace's lip start to quiver. "Oh no, no don't cry." She walked over to her and took her out of the car seat before she could start crying. She held her in her arms and looked down at the little girl, who was again looking at Kate. "As I tell your Uncle Rick, starring is kinda creepy." That didn't stop the little one from starring at her.

"Well, look who's up." Kate turned around and faced Castle. "You look good with a baby, Beckett."

"Don't get any ideas, Castle. Wedding first, kids can wait."

"I'll remind you of that when we've been married for a year or two." He took Sarah Grace from her and held her in his arms. "Uncle Rick has this awesome new toy for you. We can sit you in this little swing that we bought just for you and you can play with it...but you have to share with Uncle Rick."

Kate rolled her eyes before she smiled as she watched him walk off with Sarah Grace. She thought that she would want to just let Castle play with her while she read a book or something, but Kate followed them. She headed into the room as he was putting her into the swing.

"Look at that. Aunt Kate wants to play with us too." Kate smiled and sat down on the floor next to him and next to the swing. "You know, Aunt Kate hasn't said it out loud, but she's nervous about watching you. I don't know why, she's great with kids. Some day, she'll see that when your cousins come into the world." He moved his hand and took hers, giving it a squeeze.

She gave him a soft smile and returned his hand squeeze. She hoped that he was right, hoped that she would be a good mother when that time came. She knew that Castle would be here to make sure that she was doing it right and to reassure her when she had doubts. He really was an amazing man.

Sarah Grace wasn't in a playing mood for long, since hunger took over her happy mood. Kate got her a bottle and took her out of the swing. She sat down in the chair that they had in their room and feed her. Castle just watched as she fed the little girl. Kate felt his eyes on her and looked at him.

"Like I told her, starring is creepy."

He smiled at her. "You really do look good with a baby, Kate, and I meant what I said to Sarah Grace. You're going to be an amazing mom. Our kids are going to be the luckiest kids in the world because they have a mom like you."

She motioned with her finger for him to come to her. When he did, she leaned up and pressed a soft kiss to his lips. "And they're going to have an amazing father."

When Sarah Grace was about half way through, Kate took the bottle away from her to burp her. She wasn't sure exactly how to hold her, but Castle moved her hands to show her how to do it right. The little girl startled Kate when she let out a huge burp...which also prompted her to spit up.

"Castle, can you..."

"I'm on it!" He got the burp cloth out of the bag and cleaned up the spit up that was on Sarah Grace and on Kate's pant leg. "I'll get you a pair of sweat pants to change into."

The next time that Kate burped the little one, she made sure to have the burp cloth ready. Thankfully, this time she didn't spit up. Sarah Grace ended up falling asleep in Kate's arms and she transferred her into the crib. Castle got her blanket and placed it over her, also placing her favorite little toy next to her. It didn't make noise, it was a stuffed duck, but it was really soft. Much like her blanket. Kate changed into her sweat pants and Castle changed as well. They then headed out into the living room and sat down on the sofa.

"We'll hear her right?"

He smiled. "Yes, we'll hear her from here. She'll be fine."

"Good."

He placed a kiss to the top of her head. "You want to help me give her a bath later?"

"Are you going to teach her how to splash?"

"Maybe..."

"Then I'm going to have to make sure that I supervise or else Jenny and Ryan might never let us babysit again."

He smiled brightly. "Again? You sure about that?"

She snuggled into him more. "Yea. It will be good practice for when we have our own. Plus, I have a feeling she's going to love her Uncle Rick. We can't deny her that."

He laughed. "That we can't, but she's also going to want to spend time with her Aunt Kate, so we can't deny her that either."

"Good thing we're getting married, huh? Ryan and Jenny won't have to flip a coin to see who babysits."

He smiled. "I can think of a few other reasons, but yes, it's a very good thing we're getting married."

She let a yawn escape her. "We'll hear her if we fall asleep, right?"

He tightened his arms around her. "Don't worry, sweetheart, I can assure you we will. They might be small, but they let you know when they're awake."

She let a sound of content escape her before she fell asleep against her fiance, dreaming of what their future would be.