A/N: I'm 20minutes late for the first one...oops. Oh well, somewhere in the world it is still the 1st of December so never mind. Anyway, this is my Castle story for the 25 Days of Christmas thingy on Tumblr. I've got the link in the Doctor Who Story, not going to put it up here as well. Is on celestialcow's tumblr though. Anyway, enjoy the short chapters filled with some Caskett goodness =)

Day 1 – Mistletoe

Even though it was a Saturday and she didn't have to go to work she woke up early and snuck out of bed. When she walked through his office she could see little bags hanging over the window and wondered what it could be. She craved for a coffee though so she ignored it for the moment and walked to the kitchen.

As she was sitting on the kitchen counter, waiting for the coffee machine to warm up, she could hear the tapping of bare feet on the floor and she looked up.

"Why are you awake?" she asked softly.

"Because it got colder when you left," Castle replied sleepily, rubbing his eyes. "Is the coffee ready yet?" he added and she shook her head.

"But it should be in a bit. Go back to bed, I'll bring you one."

He smiled at her but walked towards her instead.

"Do you even realise what day it is today?"

"Anything special?"

"Really Kate? Of course it's special!"

"Did I forget something? Some important date or something?"

"It's the first of December!"

"So?"

"Christmas season has officially started!"

She laughed and shook her head. "No need to get so excited, Castle, it's only Christmas."

"It's only Christmas?! It's the most glorious and joyous season of the whole year! And it is our first together! We have to celebrate it!"

She could see how he got all excited and smiled.

"Just because you're so overly thrilled about it I'm going to humour you."

He grinned at her, took her hand and dragged her towards the office; the coffee was forgotten for now.

In the office he turned on the light and turned her towards the window where she saw the bags again.

"What is it?" she asked.

"An Advent Calendar, obviously!"

"And?"

"It's for you…"

"Oh…but… Castle, you can't give me something every single day!" she protested immediately. Christmas wasn't really something she enjoyed anymore, not since it became the last memory she actually had of her mother, or almost the last one, and she'd kind of ignored the season for the past years. Of course she could've known how important it was for Castle but she didn't have anything for him and she felt a little bit bad. Castle however wouldn't take no for an answer and insisted on her having this Calendar. He also insisted it stayed where it was. It ensured that she'd come over every day. Not that that wasn't the case already.

"Look, it's nothing pricy in there. At least not all of it. Will you just open the first one, please?"

She sighed. "Fine, I'll open it…"

He led her to the red bags and she realised they were all numbered and not too big. That guaranteed her that the presents wouldn't be too expensive unless he was giving her jewellery which she would refuse to accept anyways. She looked for the number one and found it.

"When did you even put it up? I didn't see it last night…"

"I waited for you to fall asleep and then got back up to finish it," he replied with a grin on his face.

She smiled at him with a raised eyebrow and pulled on the string to open the bag. She could feel something strange inside and when she opened it to peer inside she could see that it was a little branch of something.

She looked at Castle who just smiled and walked over to his desk.

"That in there is just the symbol. This is the actual thing," he explained as he pulled out a mistletoe branch with a nice red bow around it out of his desk drawer.

Kate laughed a joyous laugh and walked over to him.

"What do you want with this? We really don't need mistletoe to kiss each other, now do we?"

He shrugged his shoulders. "I know, but it's romantic and you can put it up wherever you want to, even the precinct. Or you can move it around every day so we have to kiss in different places."

She shook her head in amusement. "You really are a hopeless romantic," she laughed and went to kiss him but he stopped her, holding the mistletoe in front of her.

"You're joking right. Do you only want to kiss me below a mistletoe branch now? Because if you do, you won't get even an attempt of a kiss anywhere else."

"As if you could manage that," he replied from behind the mistletoe but lowered the branch nonetheless, letting her kiss him tenderly.

"Can you put it up now?"

Kate laughed softly and nodded. "Close your eyes, I don't want you to know right now where it is."

He smiled and did as he was told while Beckett went to put the mistletoe somewhere suitable and when she returned she found him with his eyes still shut. She stepped closer, stood up on her tiptoes and kissed him again.

"Now it's time for coffee" she said softly after they parted and he nodded in agreement.

"First Christmas season as a couple. Should be fun, shouldn't it," he stated and Kate only took his hand and nodded.