Hi everyone, I'm so sorry I haven't updated this story in ages, I've just been so busy and I keep meaning to get back to it. Then I've been so excited about Castle season 5 too! This is my final chapter for this, but I have another fic I'm about to update, and I'm starting a new one too.

I dedicate this chapter to Caskett_forever for all her lovely comments Thanks everyone for reading and reviewing this, it means a lot. So this is the end… enjoy!

Kate could hear Castle on the other side of the bathroom door, begging her to come out. He promised to take things slowly… so why was he proposing? Everything was perfect between them. Of course Kate had thought about marriage, and it was clear she probably would end up marrying Rick Castle, but not yet. Mrs Kate Castle Kate thought to herself, it did have quite a nice ring to it. I wish my mum was here to talk to about this, she'd know what to do, Kate thought. Of course Castle made her happy, she loved him, she… she wanted to spend the rest of her life with him. So the answer was clear.

Kate wiped her eyes, swept her hair off her face and unlocked the door. She nearly fell on top of Castle as she walked out. "Kate, I didn't mean to-"

Kate put a finger to Castle's lips to make him stop talking. "So I thought about it, and yes, yes I'll marry you Rick!"

Rick Castle looked like he could faint, laugh, or grin. "What?" Kate questioned.

"Oh Kate, I wasn't asking you to marry me! I was asking you to move in with me."

"Oh…"

"But we can always skip the moving in part and go straight to marriage if you still want to?" Castle asked, wording his question very carefully.

Tears were welling in Kate's eyes, she was finally happy; she was going to marry her true love. "Yes!"

Everything turned into a blur, Castle swept her off her feet into a big hug, repeatedly kissing her. Kate had the biggest smile on her face and Castle's whole face was lit up. "We are going to get married!" He exclaimed.

"I know, and I can't wait to become Mrs Castle."

"Ohhh, Mrs Kate Castle that is so hot."

"Shall we celebrate?" Kate asked, with a cheeky wink.

"Oh Detective Beckett, I thought that you would never ask." Castle replied still smiling as he scoped her up and carried her to the bed.

….

Later that evening Kate and Rick were sitting cuddled up on the couch with a glass of wine. "I love you Kate, I think that you just made me the happiest man alive."

"I love you too," Kate said leaning in to have a long, slow romantic kiss.

"Wow!" Castle exclaimed, "Your kisses are amazing."

"You know what? You're not so bad yourself Castle."

"Oh, I nearly forgot I have something for you, wait there." Castle said, as he walked into his office.

Kate patiently waited for Castle to return. When he walked through the doorway again, he was holding something small in his hands. As he walked over to Kate he said "I was out the other day and I walked past a shop and saw this and thought I just had to buy it for you, and give it to you when the time is right."

Castle opened the small black box in his hand revealing a beautiful, sparkling engagement ring. It was absolutely gorgeous, the type of ring Kate definitely would've chosen. He knows me far too well, she thought. "Oh god Rick, it's beautiful. I love it!" Kate exclaimed, "I know this sounds stupid, but can you propose again? This time we'll know it's for the right thing too!"

"Anything for you Kate," Castle began as he got down on one knee, "Katherine Beckett, the moment I laid eyes on you four years ago I knew you were something special. You are incredible; I've never known someone who is so driven and extraordinary. Every day you still amaze me and my love for you grows even more. I couldn't think of anyone else I'd love to spend the rest of my life with, Kate I love you to the moon and back and would you make me the happiest man to have ever walked this earth by marrying me?"

Kate couldn't even talk; she had the biggest smile on her face and was crying tears of joy. She nodded her head. Castle slid the ring on her finger, it fitted perfectly. "Would you look at that, I have left the extraordinary Kate Beckett wordless."

"Very funny Castle, I'll let you get away with that comment because that proposal was so sweet. I really do love you Rick." Kate said leaning in to kiss Castle.

"I can't wait to see the others reaction, we should get them all together and tell them." Kate said.

"And that is a perfect idea, my lovely wife to be." Castle said smiling.

"Let's have an early night, because we've got packing to do tomorrow!"

"Packing?" Castle asked

"Oh, Rick, don't you remember your first offer of me moving in with you?"

"Oh yes that, I can't wait to have you living here with me! Oh and does that mean when we are packing I might get to see your box full of kinky stuff?"

"Oh Castle! You might, you never know. And if you're really good I might do my ice cube trick on you."

Castle looked like he could fall off the chair. He was frozen.

"Oh come on Castle, if you're lucky I might use my handcuffs on you tonight!"

…..

Kate and Rick had spent most of the day packing things up at her apartment and taking them back to his place. They had just sent a group text to Lanie, Esposito, Ryan, Martha and Alexis telling them to meet them at the Old Haunt. "Ready to tell the world that we are going to get married?" Kate asked Castle as they walked out of his loft.

"Of course, and if we are back early tonight we can always christen my office."

"Oh Castle! I thought that you'd never ask, you naughty boy!"

"And maybe you could do your ice cube trick?"

"Nice try Castle."

Kate and Rick walked into the Old Haunt holding hands so they others couldn't see the wedding ring yet, but they didn't have to. It was Kate and Rick's big grins that gave it away.

So this brings us to the end of the story. I hope you have all enjoyed this; I've loved writing it for you guys. I might write a sequel… thanks again for the lovely reviews!

Emma