Disclaimer: I don't own Castle. Never have, never will. It's probably for the best... xD

A/N: Well, I started this fic and then changed directions COMPLETELY. *shrugs*

The songs used were "Terrified", by Katharine McPhee and Zachary Levi (from Chuck, yeah yeah, I know) and Love The Way You Lie part 2, by Rihanna and Eminem (Eminem's part).

Thanks for the reviews, alerts and favourites. They make me squee :P

And this is a long-ish chapter, and there's probably mistakes. Sorry! READ ON!

Terrified

Richard Castle was wandering sleepily through his loft. He ran his hand through his wet hair, making it stand on end. He started to make his way to his kitchen to make breakfast when he heard a knock on his door. He changed course and headed for the door. He opened it and frowned.

"Beckett?" he asked blearily, still half-asleep.

"Castle? Why aren't you ready?" answered Beckett in surprise. "And why aren't you wearing a hirt?" she added as an afterthought.

Castle looked down at his bare chest and sweat pants. "I just got out of the shower. Here, come on in." He ushered her inside. "What are you doing here? I told you, I could just take a cab."

Beckett shrugged. Why pay cab fare?"

Castle grinned. "I'll be right back, I need to get dressed. Make yourself at home." He strolled away.

Beckett sat on the plushy couch and just as she did so, her phone buzzed. She saw when she saw that Josh wanted to have dinner with her that night. So much for having a relaxing night. She composed a quick reply, agreeing to his offer and sent it. Just as she was putting her phone in her pocket, a red-headed teenager made her way down the stairs.

"Detective Beckett?" the girl asked, confused. "What are you doing here?"

"Don't worry, I'm not arresting your dad." Beckett grinned. "I'm just driving him to work until he gets his car fixed. And please, call me Kate."

"Well, knowing my dad, I wouldn't be surprised if he did get arrested again." Alexis shook her head and sat next to Beckett on the couch.

"If who got arrested again?" asked a voice, drifting down the hallway.

"Your'e not a morning person, are you, Castle?" Beckett grinned, when Castle appeared, still not wearing a shirt.

As Castle followed her gaze to his shirt in his hand, Alexis was trying to not smile. Knowing her father, he was doing that on purpose.

As Castle was putting on his shirt, Beckett was pondering his muscular-ness. She had really underestimated him. ..but when was there time for him to work out? He was with her every day - and well into the evenings - at the precinct, or out on cases.

Hmm... Beckett thought. I'll have to spar with him, see how good he is.

She braced herself for the dirty comment that Castle would make about the last part of her thought... then she realized that she had been thinking that, she hadn't actually said it out loud.

"Okay, let's go. We can get a coffee on the way there." He snapped her out of her reverie.

"Yeah, you're really not a morning person. You're shirt's on backwards." Beckett smirked.

Sighing, Castle took off his shirt and put it on the right way. He hugged Alexis, then grabbed his coat. Following Beckett out the door, he called "Bye, sweetie, your lunch is in the fridge." to his daughter.

Beckett grabbed Castle as he started walking in the opposite direction as the elevator. She suppressed a smile and he grinned sheepishly.

They rode the elevator in silence, then headed to her car. As she started it up, Castle started fiddling with the radio dial. Beckett smacked his hand station. He sang along to every song.

Beckett rolled her eyes, but she secretly loved listening to him sing. He had such a great voice, but he got lost in each sing, and she loved seeing the relaxed side of him.

A new song started, one of Beckett's favouritees, and she subconciously started singing along. Castle was surprised, he'd never heard her sing before. He liked her voice.

You, by the light, is the greatest find

In all of wrong, you're the thing that's right.

Finally made it through the lonely to the other side

You said it again, my heart's in motion,every word feels like a shooting star

I'm at the edge of my emotions, watching the shadows burning in the dark.

And I'm in love, and I'm terrified for the first time and the last time in my only life.

Castle jumped into the song, singing the next part with no hesitation.

This could be good, it's already better than that.

And nothing's worse than knowing you're holding back

I could be all that you're needing if you let me try.

Beckett joined in and they sang the next part together.

You said it again, my heart's in motion, every word feel like a shooting star.

I'm at the edge of my emotions, watching the shadows burning in the dark.

And I'm in love, and I'm terrified, for the first time and the last time in my only life.

Grinning, Beckett parked the car in front of a Starbucks and turned off the car.

"Wow." Castle commented. "You have a great voice!"

"So do you!" she grinned as they entered the coffee shop.

Castle gave their orders to the man behind the counter and they moved off to the side.

Minutes later, with coffee in hand, they left the coffee shop. Someone ran smack into Beckett.

"I'm sorry." the man apologized, holding onto Beckett's arm.

"That's fine." she smile tightly. "Can you let go of my arm please?"

"Oh." he quickly let go of her. "Well, bye. I'll see you around." He went into the Starbucks.

"That guy was a creep." commented Castle as they climbed into Beckett's squad car.

"Mm." Beckett agreed.

She started pull away, but when she looked back in the rear-view mirror, she saw the man's eyes following her. She shook it off, and instead, she listened to Castle rapping to Eminem.

I'll follow you like a lost puppy

Baby, without you, I'm nothing, I'm so lost, hug me

Then tell me how ugly I am, but that you'll always love me.

Then after that, shove me, in the aftermath of the

Destructive path that we're on, two psychopaths but we

Know that no matter how many knives we put in each other's backs

That we'll have each other's backs, 'cause we're that lucky.

Beckett rolled her eyes. Well, that was Castle for you: starts off singing a sappy love sing, then shifts instantaneously to a rap.

As Beckett half -listened to Castle, she couldn't shake off how creepy that man at the Starbucks was. Shaking her head slightly, she told herself to ignore it, and if something were to happen, Castle would protect her. He was her partner, her plucky sidekick though and through.