It's CS AU week over on Tumblr and my muse and I decided we need a little break from our multichapter fics. We're taking a little holiday by letting the AU bunnies run wild and writing something for every day of AU week. But be aware … I've run with what jumped into my head the moment I read the description for the different days. So it doesn't 'fit' perfectly for every day.

(Rated M right from the start because at least one chapter is going to be smutty.)

Day 1: Crossover

I loved the movie 'One Day', up until it broke my heart and left me sobbing so bad that I couldn't see the screen anymore. Anyways, I like the idea of the movie and even though it's not a crossover per se, since I'm putting them in the 'One Day' universe and not letting them step into that universe as the Emma and Killian from the show, it's an AU. So it still counts. :-)

And of course this little one-shot does have a happy ending, because the last part of the movie ripped my heart out and I would never put you through that agony.

2014

They'd chosen this particular date for a reason … the 21th of July.

Because it was their day.

Of course they were about to take this monumental step on this day.

21th July 2000

Her sixteenth's birthday had been two months ago but Killian had decided that they needed to celebrate it again. Not that there had been much celebration on the actual date. Her foster family wasn't that bad, she'd seen worse. But they didn't really care about her. She'd gotten a new pair of shoes and a donut as a birthday cake and that was that.

Emma had stopped hoping for real birthday gifts a long time ago, but then Killian stepped into her life three days after her birthday and even though he didn't have much money he still managed to give her a special day after he'd found out that he'd missed her birthday only by three days.

They spent the day in the park, feeding the ducks with old bread and sharing an ice cone. It was a beautiful day with the sun shining bright and the wind breezing just the right way so that the heat didn't get oppressive.

In other words it was perfect. A perfect day.

So they decided to make that day special. They pinky promised on it. No mattered what happened they would always reach out to each other on this day.

Always.

21th July 2004

A fake passport was enough to get her into the party where the alcohol would flow freely. She hadn't thought it was possible but Killian told her it wouldn't be a problem. And of course he'd been right. Like always.

She'd just stepped to the bar when her phone vibrated in her pocket and she pulled it out with a huge grin on her face, knowing exactly who the text would be from.

Did you get in?

She walked into a quieter corner, leaning against the wall as she texted him back.

Yup, I did. I'm ready to get sloshed.

Think of me while you're downing your 'Sex on the Beach'.

Ha, ha. You wish.

I'm enjoying the heat here while you're freezing your arse off up in New York.

I hope you'll get eaten by a lion.

There are no lions in Venezuela.

I'm sure some poisonous animals are traipsing through that jungle.

Wanna get rid of me, Swan?

Maybe?

Go get sloshed.

Will do.

Don't forget to text me when you're home.

Aye, aye, Captain.

Brat!

But you love this brat.

You're insufferable. Go get hammered.

Is that an order?

Aye, that's an order.

See you soon.

Take care, Emma.

The conversation left her grinning like a loon, and when she shoved her phone back into her pocket she swore that she would enjoy the evening to the fullest.

After all she had to follow her best friend's order.

21th July 2008

They hadn't seen each other for over a year, but when it mattered he was here.

He'd knocked at her door two hours earlier and when she'd opened the door the pain had lessened just a little bit. He'd stood in front of her with two huge packets of her favorite ice cream, a bag full of Oreos and three bottles of red wine, wearing a lopsided smirk on his face. Of course she immediately felt better.

He'd listened to her rant without interrupting her, offered her his shoulder to cry on and even suffered through both Bridget Jones movies with her, keeping her wine glass filled and Kleenex at the ready whenever she started to have a crying fit.

She couldn't remember ever crying so much in her whole life, but she'd really believed that Walsh was it. The One. The right one. The only one. He seemed to be perfect. But in the end he turned out to be an asshole, cheating on her with his secretary.

His secretary. How cliché.

"It's gonna be okay, Swan," Killian said softly, pulling her against his chest. Gulping hard, she tried to keep the tears in check. She'd cried enough for one day. Killian's hand tightened around her shoulder and she felt his lips brush over her hair as he added, "He didn't deserve you. You can be glad you've got rid of him before it was too late. Before you ended up chained to the kitchen stove."

She slapped her hand against his chest before pushing back to meet his gaze. He actually coaxed a chuckle out of her despite the tears still blurring her vision when he wiggled his eyebrows at her in a ridiculous exaggerated way. Relaxing back into the embrace, she closed her eyes, thanking the universe for sending her the best friend in the whole world when she needed him the most.

21th July 2010

This time she was the one holding his hand, figuratively, as he cursed and shouted, his hands balled into tight fists as he paced in front of her. This time his heart had been broken and she bit her tongue to keep herself from saying 'I told you so'. But she had told him, told him that an affair almost always ended in heartbreak. In the end she had been right, even though she wished she hadn't been. She didn't want to see him hurt like that. It broke her own heart to see him so devastated.

This time she brought the alcohol and the junk food. This time she suffered through watching Aliens vs. Predator. All three movies. Without one single complaint.

He fell asleep on her lap in the middle of the third movie and when the credits rolled over the screen she only managed to switch off the TV before she fell asleep herself. They both woke up with sore necks, but as Killian made her breakfast she saw the light come back into his eyes and seeing him taking the first step out of the pain lifted a weight off her shoulders.

He was her best friend, and she couldn't take it to see him hurt.

21th July 2012

They were lying on the hood of his truck, staring up into the clear night sky, enjoying the twinkling lights of the stars. They were almost touching, their fingers only a hairsbreadth apart and she felt tingles rush all over her body.

There had been a few of these moments over the last twelve years. Moments when her heart had skipped a beat as she'd looked into his blue eyes, moments when goosebumps had raced all over her body as his fingers had brushed over her skin, moments in which the promise of more had hovered just out of reach.

Maybe it was just one of these moments again. Maybe she was just imagining the tension thickening as the seconds ticked by. Maybe she just wished that this time the tension would uncoil in a satisfactory manner.

"Do you ever wonder ..." his soft voice broke the silence. Tilting her head to the side she tried to see his face clearly, but the two torches he'd set up beside the truck didn't give off enough light.

"Wonder what?" she asked, her heart doing a somersault in her chest as she waited for his answer, not wanting to hope for something that might never happen.

"It's been over twelve years," he said, his fingers twitching against hers, the contact making her suppress a full body shiver.

"We've known each other for a very long time," she replied noncommittally, not treading into deeper water just in case she was interpreting too much into the situation.

"Did it ever cross your mind … I mean … did you ever think about the 'what if's'?"

Her heart actually skipped a beat, her chest filling with hope even as her mind tried to keep herself on the ground. She could just brush it off, make a joke about it. But somehow she found the courage to ask, "Are you talking about us?"

"Yes, I'm talking about us. You and me ..." His eyes locked on hers and a few tense seconds passed before she felt his fingers slip through hers. She entwined her fingers with his automatically, her breath hitching in her throat when he added, "crossing the line."

"Being friends with benefits?" she breathed, the question almost getting lost in the noises surrounding them. But he'd heard it nonetheless, his fingers squeezing hers.

"No, we wouldn't be able to pull that off, would we?" he replied, shooting her one of his trademark smirks. But he got serious only a blink of an eye later, his thumb brushing over the back of her hand, making it hard for her to concentrate on what he was saying. "No, I'm talking about the real thing."

His words caused her stomach to flutter with nerves. She suddenly didn't know if she was ready to cross the line with him. She could lose the most important person in her life if this went south. Her need to flee grew stronger and she shifted away from him, trying to slip her hand out of his as she mumbled, "Killian, I ..."

"Don't dismiss it right away," he interrupted her, his fingers gripping hers almost painfully. "Please, Emma. Just … take a night to think about it, okay?"

"And if I don't want to think about it?" she shot back, finding a braveness in her she'd lacked just a moment ago. Her heart threatened to beat out of her chest, but she decided to take a leap of faith and jump, hoping that he would catch her. "How about testing the waters?"

"What do you have in mind?"

He turned on his side, his face so close to hers now that she only needed to move forward a few inches to press her lips on his. Something she wanted to do desperately.

"A kiss," she whispered, holding her breath as she waited for his response.

And what a response she got.

His lips crashed down on hers a moment later, his tongue flicking against her bottom lip, begging her to open up. She obliged instantly, letting him in. The kiss was everything she'd hoped for. And so much more. It left her catching her breath, her mind reeling.

"Bloody hell," Killian muttered under his breath. He was hovering over her by now, though she didn't even realize him moving. "Why did we wait twelve years?"

"I have no idea," she murmured, shifting her leg upwards so that his obvious arousal was pressed even harder against her thigh.

He growled deep in his throat, the sound making her core clench with need. She swallowed a moan when his growl was followed by his rasping words, "I'm gonna kiss you again if that's okay with you."

"It's more than okay."

He kissed her again, though this time his hands started roaming over her whole body, eliciting one fire after the other under her skin. They almost ended up having sex on the hood of his truck, but fortunately they could keep the lust at bay long enough to get to an actual bed.

Of course she had the best sex of her life on their day.

With him.

21th July 2014

Her hands were shaking as the organ started to play and Elsa threw her an encouraging smile over her shoulder before her friend stepped around the corner and walked up to the front. The music changed and that was Emma's cue.

She almost stumbled over her own feet as she stepped forward, her heart slamming against her ribcage and her hands starting to grow damp as she stopped in the doorway, her nerves threatening to get the better of her. But then her eyes fell on the man standing at the altar, waiting for her, and all the nervousness just vanished.

It had taken them over fourteen years to get to this point. To realize that they were perfect for each other. They had been friends for twelve years before they finally realized that being friends wasn't enough. But they'd come to their senses eventually.

And now they were here. About to be married.

It was another beautiful day. Another perfect day.

Their day.