A/N: And because most of us love Christmas (you know, everyone except me, apparently) here is the way I imagine Caskett to get in the Christmas mood. I don't know if Beckett's dislike of Christmas is fanon or canon but it's been stated in some fanfiction so I just used it too.

Prompt for tomorrow: Castle/Beckett, working late.

Castle/Beckett, All I Want For Christmas Is You. Prompted by rebafreak ^^

Beckett looked up. Did she hear... Was that... Oh God.

It can't be Christmas yet. The year hadn't passed so quickly, surely? She hadn't even noticed it passing, packed in work as she had been. But now, she was definitely hearing Castle sing Christmas carols. At the precinct. Oh, he was so dead.

She burst into the room next to her office and sure enough, Castle was singing along loudly to the radio. She turned it off, but he kept on singing further, dancing towards her.

'I just want you for my own, more than you could ever know, make my wish come true...' He paused there for dramatic effect. Right now, he stood right in front of her, and she was looking anxiously over her shoulder to see how quickly she could reach the door. She heard the lock fall into place and saw two men shaking with laughter behind the small window. Great, Ryan and Esposito'd had a 'brilliant' plan again. She would have to make them pay for this later.

Castle got her out of her thoughts by grabbing her hands and finishing the song.

'Baby, all I want for Christmas, is you!'

She chuckled, she couldn't help herself. He was making such a fool of himself. And, while she never would admit it, he was a good singer.

'So, what do you think, Beckett? Will you finally go on a date with me?' He was hopeful. He had, after all, made her smile already. She considered it. She actually, honestly did. Would it even be so bad?

But this was Christmas. She didn't want to be reminded of that fact. So she declined.

'No, Castle. Not this time.'

He pouted but admitted defeat.

'I will get you someday, Detective!' he yelled after her as she left the office. Ryan and Esposito had been smart enough to unlock the door when they saw her coming, and flee right after. Beckett had no reason to doubt what Castle said. But, if she would ever give in to him, he was damn well going to fight for it. She would not be one of his easy conquests, nor would she be a short-time fling if she could have a say in it.