So this is my second once upon a time story so please be nice. I will admit I ship captain swan. I really don't understand swanfire (is that the bae/Emma ship? I can't remember). He's already left her once. That was just bad form.

This is a song fic cause I think this song if sooooo Killian/hook, whatever you want to call him he's hot!

I do not own Once Upon a Time or it's characters.

This is based on the song DNA =D

Please review!

It's the blue in his eyes that helps me see the future
Fingerprints that leave me covered for days, yeah, hey, yeah
Now I don't have any first degree
But I know, what he does to me
No need to work it out, it's so familiar, ooh, ooh, ooh

And my heart won't beat again
If I can't feel him in my veins
No need to question, I already know

It's in his DNA
D-D-D-DNA
It's in his DNA
And he just takes my breath away
B-b-b-breath away
I feel it every day,
And that's what makes a man
Not hard to understand
Perfect in every way
I see it in his face
Nothing more to say
It's in his D-D-D-DNA

Emma glared up at him. "No."

Killian smirked at her. "Come on love."

Emma just glared at him, trying not to notice how good he looked or how his hand on her arm was leaving her breathless and tingly but by the glint in his eyes she knows so well let's her know that he's accurately guessing what she is thinking, and feeling.

"Don't use your charms, what little there is of them, to get out of this Killian Jones. If my parents are making me suffer you have to suffer right along with me."

"But I'm not royalty."

"Not in the sense I am but you are the son of a Duke. Besides it doesn't matter, you're my best friend so you have to come."

Killian Jones and Emma Charming had been friends since Killian at the age of three had walked into Emma's room, where she was crying in her cot and had started talking to her. Emma immediately stopped crying and stared at young boy and since then rarely have they not been together causing some strife in the palace.

"You are the only princess I know that would think a ball for her seventeenth birthday was torture."

"And you're the only lieutenant in my father's whole navy that doesn't want to go flirt with all the young ladies at the ball."

"Perhaps they just haven't met all the young ladies like I have."

Emma smacked him in the chest with the back of her hand. "Shoo Killian. My mother will be here soon to torture me."

Killian rolled his eyes and bowed mockingly at her. "Of course your royal highness. Whatever you wish your highness."

Emma raised an eyebrow at him. "I'm not sure you could take that Jones."

Killian smirked; his blue eyes once again getting that familiar glint in them. "I think you'd be surprised by what I can take Charming."

He got out of the room quick smart then, the hair brush Emma threw just missing his head.

"See you at the ball love," he said poking his head in the door way then going off to his room to get ready.

She rolled her eyes again and smiled to herself. He's was an incorrigible scoundrel but he was Killian so Emma had to love him even when she hated him.

She often wondered what it was about him that she couldn't resist. His blue eyes that always made her think of a life they could have together, his black hair, his innuendos that he loved saying, his flirty nature, how he lived by his own rules, how he had her back, never lied to her, his stubbornness, how he is always a gentleman, his belief that a man should fight for what he wants, or was it simply him?

Her mother came in while she thought about him, and gently put her hand on her should.

"Come on Emma, it's time to get ready," She said gently.

They get ready, joking together, needing no help from the servants. Only Johanna helps, who is family to both of them, especially Snow.

Snow was dressed in a dark green dress, with the sleeves falling off her shoulders with a sweetheart neckline. The dress had roses embodied all over it, with a simple emerald necklace, earrings and bracelet. Her hair was pulled up, kept in place with emerald hairpins.

Emma wore a dark blue dress with no sleeves and a sweetheart neckline. Like her mother's it also had roses embodied all over it, with a sapphire choker, earrings and bracelets. Her hair was half up, half down, with ringlets framing her face. Her mother, who wore simple makeup herself, decided to the same with Emma so both wore light brown eye shadow with red lips.

Emma smiled at herself, then made her way, arms linked with her mother's to the side entrance hall, from which they would make their entrance.

Killian and her father waited for them and when they saw Emma their jaws dropped.

"You know I don't think I should let you out tonight Emma. I'm afraid someone might steal you from me," Charming said once he got his thoughts together.

Emma laughed at her father as she hugged him. "Well I have no problem with that at all Dad, but you might want to talk to Mum about that."

Charming looked over at his wife and then back down at his daughter. "So now we both get tortured then. Me with having to watch all these young men trying to win your heart and you with having to break them."

"I'm not sure she finds that all that torturous mate. She gets great enjoyment breaking mine every day," Killian interjected, unable to help himself.

Emma rolled her eyes at him. "You are such a princess Killian."

"I'd have to take your word on that Princess Emma," he replied.

Emma opened her mouth to snap some witty comment back when the trumpets sounded and both she and her father groaned.

"You are defiantly your father's child," Snow sighed as she linked arms with Charming while Emma and Killian did the same thing.

"You make that sound like a bad thing Snow," Charming replied, smiling at his wife.

"That's because it is," she replied, staring forward, but Charming knew she was trying to fight a smile. Killian looked over at Emma who fake gagged at her parents' moment.

"King James and Queen Snow," Happy called out.

Snow and Charming smiled at Emma and Killian before they made their way out to the thunderous applause that awaited them.

Emma gripped tightly onto Killian's arm for a second then almost as quickly loosened her grip.

"Princess Emma and Lieutenant Killian Hook Jones," Grumpy called out and both Emma and Killian could hear the amusement in his voice at calling Killian Hook. Killian had lost his hand at the age of four, thanks to his father's mistress's husband, who had swung with his sword at the same time Killian had put his hand in the way, trying in vain to stop the man hurting his father, which it did just not in the way Killian had planned. The man took Killian with him when he left, straight to King James. A hook was given to him and he's had the nickname ever since.

Grumpy and the dwarves had taken Killian and his brother Liam in, at the man's request and looked after them, encouraging both men to join the navy when they reached the age of 15. Grumpy or Duke Grumpy as he was called at these events, much to Charming's, Snow's, Emma's and Killian's delight, was Killian's adopted father, having bonded with the boy when he first came to see Emma.

Killian's mother passed away shortly after Killian and his brother moved in with the dwarves, with their father being banished by Charming shortly afterwards. Thankfully Charming and Snow allowed both boys to keep their right as Dukes to their parents' lands and their fortunes but neither could access the fortune until Killian, the younger of the two, turned 25.

"You know I swear he enjoys calling me Hook more than calling me by my actual name," Killian muttered to Emma as they made their way down the stairs.

"He's been doing that for the last 17 years Killian, do you really expect him to stop now?" Emma asked, smiling at her friend.

"No but it got you to smile love," Killian replied, smirking.

Emma had to resist rolling her eyes at him, as they finally reached the bottom of the stairs and made their way to sit behind Snow and Charming.

Snow and Charming both gave short speeches all about Emma before Charming took Emma's hand and danced with her.

"Good luck Emma," Charming said, smiling at his daughter's look of horror she shot him before she put up her mask as young eligible man begged her to dance as they finished up their dance together.

Throughout the night Killian, Charming and the dwarves tried to save Emma as much as they could but all the young men were of course smitten with her and did their best to try to dance with her.

Emma, claiming to need to catch her breath left a group of them there on the dance floor as she made her way to the back of the hall. She leaned against the wall, exhausted.

"Having fun?" Red, her god mother, asked walking up to her.

"I will be once tonight is over," Emma replied. "I am tired of all of these fakes trying to win my affections like I'm some trophy."

"You know sometimes I think your mother was glad she was a bandit and your father a shepherd because both of them would never be able to do all of this. I remember your mother telling me once that she actually threatened to stab someone at her 18th ball, so you are making it through better than she did."

Emma and Red laughed, imagining an 18 year old Snow threating someone but the laughter died in Emma's throat a moment laughter.

She had spotted Killian leaning against the wall, a mere couple of metres away with a young girl, a year younger then Emma, who was running her hand over his chest, all the while he just smirked at her.