Imagine : 

It's 2am on a cold night.

Sam and Dean are loading shotguns full of rock salts and Cas is sitting across from you.

He's focusing on his hands and barely hears Dean yell his name.

Your listening to these two talk about salt circles and something about demons or ghost or angels, your not really paying attention.

All that matters to you is the worried look on Castiel's face.

The weird thing is you should be scared for your life, after all you got trapped in some random abandoned house that thankfully had some candles.

You're not suppose to be here, you should have been in bed with a good book. But of course you decided to pay a visit to your favourite blue eyed angel and now look what's happened.

You get up and cross the room to where Castiel sits silently. "How you holding up," you ask.

"I should be asking you that," he says while turning his body towards you. "Listen, I never wanted you to be in this kind of situation, when I told you about all this it was so I would never have to be lying to you, but I-I was hoping to never have to show you this life."

He looks at you with that puppy eyed glance and your heart melts.

You replay the moment in your mind.

It was only a week ago when the secret about the Winchester family business was exposed. You feel guilty about calling the guys crazy and running out on them, but what else could you have done.

It's not everyday you find out the guy you have a crush on is an angel or was an angel.

You still don't quite understand all that stuff.

You hear Sam say something about how those things shouldn't be here in a while which brings you back to reality.

Cas has fallen silent once more and you can't stand to see him like this.

You take out your iPod and get up the nerve to put a slow song on.

All three guys stare at you and all that comes to mind is, "we might as well have some fun while were waiting".

You see Dean and Sam look at each other with a puzzled look, but Castiel still doesn't respond. So you grab his hands and pull him up.

"What are you doing" he asks.

"I'm going to teach you how to slow dance" you say with a smile on your face.

Dean breaks out laughing, "you really think he can learn? Good luck there honey".

You give Dean a sly glare, "OK Cas, put one hand on my shoulder and your other hand one my waist". 

He follows your instructions exactly, but stares down at his feet awkwardly.

You teach him a side step and see his face light up like a child would after tying his laces for the first time. His expression makes you warm inside and you continue the lesson.

After ten minutes Cas has got it down.

Are you lonesome tonight by Elvis comes on and Castiel lifts his eyes off the floor. He stares at you and starts to lead.

"You've got it" you proclaimed excitedly.

"thank you " he says.

"I did nothing" you say with a smirk.

"I want to thank you for trying to cheer me up, a lot of people would have walked out on me and I wouldn't have blamed them, but you. You're facing the darkness with a smile on your beautiful face and and.."

Your eyes get watery as you lay your head on his shoulder trying to hide your emotions from him. Your bodies come closer together as he rests the side of his face on your ear.

You start whispering the lyrics of the song and both of you dance as one, forgetting the evil that's coming or the brothers that are staring.

As the song finishes you both lift up your heads, nose to nose Cas whispers, "Stay with me".

"Always" you says with pure joy in your voice.

The happiness seen on his face makes you want to kiss him, but you hear a new song come on.

And so he leads, you follow, both of you never taking your eyes off one another.