AN: Hey everybody! I really like this next story, mostly because it has a little bit of Michael Buble in it and he's my favorite singer. :) Thank you for reading! Leave a review or suggestion if you feel like it. They are greatly appreciated!

Disclaimer: I do not own Castle or the characters from Castle. Castle belongs to Andrew W. Marlowe and ABC.

I've Got You Under My Skin

It was Friday night, and Castle and Beckett were going to have a quiet dinner at her place. She had requested to be off the following day, knowing she wasn't going to get much sleep. Rick was waiting for her to say "I love you", and she wanted the evening she declared her love to be special. Not that it wasn't going to be memorable anyway. Kate couldn't remember the last time she had let a man pass the heavily guarded wall into her heart – if ever.

Currently, the two were speaking on the phone.

"I'm just saying, Kate," Castle said while trying to hold back his laughter, "The way you booked that librarian today was novel."

Kate groaned and rolled her eyes. "Ugh, that's pathetic, Castle. You're a writer and you can't even come up with anything better than 'booked' and 'novel'?"

"Hey, there's no handbook for making librarian puns. And it's not exactly a textbook skill."

Kate couldn't help but giggle at his lame attempt at making a pun. "Just stop now. Please. Before it gets any worse," she said through her smile.

"Yeah," he responded instantly, knowing he couldn't do any better than that. "So I'll see you in an hour?"

"Yeah, sounds good. You have your key, so if I'm busy in the kitchen, just come on in."

"Okay, see you soon."

"Yep. Love you." Realizing what she just said, she anxiously ended the call and threw her phone on the couch, as if it were poisonous. Kate really hoped Castle had hung up before her accidental declaration. She had a plan to slip it in during their conversation over dinner, but now it looked like that strategy was shattered. Expecting him to call back right away, Kate sat down on the couch by her discarded phone and carefully crafted an excuse. After ten minutes of silence, however, she resolved he must not have heard her. With a sigh of relief, she went to go take a quick shower before preparing the meal.

After putting on some Michael Bublé (who better to get you into a romantic mood?), Beckett stepped into the shower to wash off the dirt and grime from the city, along with whatever questionable substances she may have gotten on herself at the crime scene. Her mind eventually conjured up the image of Castle holding her hand on the drive to the library. It was the little things like that that made her love him even more.

As Michael's voice trailed off at the end of "Everything" and the music grew softer, Kate thought she could hear someone open the door to her apartment. Castle wasn't supposed to arrive for another 40 minutes. She opened the shower door and peeked her head out, only to be shoved right back in and pushed up against the opposite wall. Her gasp was muffled as Castle slid his tongue across her lips and pushed his body into hers.

"Rick," she breathed, as he kissed behind her ear and made his way down her neck while his hands roamed her slick body. It felt so amazing, she couldn't think straight. When she ran her hand through his hair and realized it was soaking wet, she finally came to her senses. "Castle," she said firmly, and lightly pushed him away.

He stood in front of her, fully clothed and completely drenched as the water continued to cascade over him. "You love me," he stated simply while tucking a strand of hair behind her ear.

"Castle! You do realize you just burst into my shower, right? With all of your clothes on."

"You love me," he repeated, ignoring her comment.

Kate sighed, folded her arms over her chest and looked at the floor. "So you did hear that, huh?" she said, shifting nervously.

"Hey," he whispered, and reached out to tilt her chin up so she would look at him. "What's wrong? I'm thrilled you said it."

"Nothing is wrong, I was just going to tell you in a more romantic setting is all," she shrugged.

Castle laughed. "Kate, I couldn't care less where or when you said it. All I care about is that you love me, and I love you." She smiled as he brought her closer to him and kissed her once more, completely forgetting the fact that he was standing in her shower with all of his clothes getting soaked. Their kiss wasn't a passionate one, but a kiss that conveyed their mutual affection.

"I love you, Rick Castle."

After a minute or two of sweet kisses and gentle touches, Castle pulled back and started singing with Michael Bublé, who was still playing in the background. "I've got you under my skin. I've got you deep in the heart of me," he sang dramatically while wiggling his eyebrows.

Kate laughed and stood up on her toes so she could whisper in Castle's ear. "I'd like you deep in-"

"Hey now!" Castle jumped as he felt her hand slide over the zipper of his jeans. "I think we should listen to Michael Bublé more often," he muttered as he cornered her against the wall and resumed the trail of kisses down her neck.