This is based on the popular Korean movie, My Little Bride, featuring Moon Geun Young and Kim Rae Won from 2004/2002 Hong Kong version (My Wife is 18). But this has a PJO twist.

Quick synopsis: Due to a promise made by their forefathers, Annabeth and Percy are forced to marry while she's still in high school and he's in college. Can they keep their marriage a secret and carry on with their lives or do they eventually learn to accept their situation?

Disclaimer: I don't own the rights to either of these plots. If I did, I wouldn't be on Fanfiction.

22 years previously—

Zeus looked on with disdain as his brother and daughter continued their incessant bickering, a routine that had been continuing for how millennia he had lost count.

"How many times must I tell you, Lord Poseidon, that the people of Athens clearly preferred me over you. I am their patron goddess. If they had wanted your pathetic spring of water, they would have done so, but clearly, my olive tree was the better choice. Stop being so childish and let bygones be bygones," Athena smirked, only causing Poseidon's anger to escalate further.

"You think I'm childish? Me? Childish? Who wants olives anyway? They're only good on pizza…Besides, black olives are better than your green ones," Poseidon retorted with a peevish tone.

"You just can't accept the fact that you lost. My brains are just superior to you," Athena remarked calmly.

Zeus could see Poseidon's blood pressure rising, "YOUR BRAINS?! Superior to mine? You probably bribed them or something. You're sly; I give you that much, but I wouldn't put it past you to bribe them just to win. You'd do anything to be on top. At least I didn't have to stoop so low."

At this point, Zeus began to see the faint outline of Athena's form flickering, showing that she was close to causing massive destruction if something wasn't done soon.

Before she could utter a single word, Zeus cut in, "ENOUGH. Watching you two has been pathetic. I have had to put up with your quibbles for millennia and they're always on the same topic."

"That's what I was telling Lord Poseidon to…" Athena began before her father cut her off.

His eyes flashed in warning before he continued, "I have attempted to correct you many times, but to no avail. So, I have decided, that persuading you two any longer will just be a waste of my time. A merger is what's necessary. Poseidon, your newborn son Percy, will marry the next daughter born to Athena. No exceptions shall be made. Perhaps this way, you two will learn the true meaning of family."

With a quick blinding flash, he disappeared, leaving Athena and Poseidon dumbstruck.

"There is no way that I'll let one of my daughters marry this fool's sons…" She spat.

Thunder boomed overheard, rain pouring with such ferocity that Athena's words were drowned out.

Poseidon was still in a state of shock. His newborn son, a whole life ahead of him, already betrothed to an unborn child of his worst enemy. His own brother had condemned his infant nephew. This cruel, cruel world…

"Fine! I accept, but they won't know about it till they are of proper age. I want my son to lead a proper, normal life, free of worries from being tied down to this responsibility," Poseidon chose his words carefully as he spoke, knowing that Zeus was listening.

Athena stopped screaming as she heard the words she dreaded the most, "What have you done?"

"There's no other way. Let the two grow up however they want. Of course, they will both be attending Camp Half-Blood and will inevitably meet. But, we don't have to inform till the time has come."

"I— I have no other choice but to consent with Zeus in charge of this arrangement. Till then," Athena put out her hand as Poseidon grimly shook it, both with varying degrees of disgust on their face.

Present Day—

Percy grinned in excitement as he got out of the flight in New York, returning from Florida. He had been attending the marine biology program at USF for the last 4 years. He had only one semester remaining before he could graduate, but Chiron had sent him a message from camp, saying that his father had wanted to see him immediately.

Chiron had promised him a cab for noon; he glanced at his watch but noticed that he was still 30 minutes ahead. He grabbed a quick to-go sandwich at Starbucks and went to sit down at one of the sets near the terminal gate. He stretched his long legs out appreciatively after sitting in the cramped flight.

Percy began to glance around him, looking approvingly at the girls passing by, managing a weak smile every time one caught him looking at her. He began making his way to the exit of the airport terminal when he saw another girl: tall, slender, lithe, and muscular. Her golden curls cascaded down the side of her right shoulder, a pair of sunglasses on top. She was…hot. Percy couldn't see her face, but he could make out some general features.

He casually walked past her, 'accidentally' dropping his iPhone. He kept walking, waiting to see if the girl would bring it back to him. Instead, he saw it being kicked toward him.

"You haven't changed a bit, Seaweed Brain," the girl said with a wry tone.

"Wise Girl?!" Percy looked on at shock. "What happened to you?" He tried to hide his grin as her gray eyes became smoky.

"What? What're you talking about?" She glared back at him.

Percy allowed himself a chuckle as he slipped his arm around her shoulder, "Ananbeth, chill. I'm teasing you. But in all seriousness, you've grown up. Four years ago, let's see, you were 12. Now look at you at the age of 16, all grown up, a young woman."

"I've always been more mature than you anyway," She stuck her tongue out, while still trying to pull away from his arm.

"Nobody else cared about you, so, I decided that I'd take time out of my busy day just to come pick you up." She smirked.

Percy pretended to look hurt, "So, any idea why Chiron called me?"

"No idea, he said that Zeus wanted to convene with both of us and our Godly parents."

"When?"

"Tomorrow morning."

"Excellent. That gives me some time to settle down. Want to have a spar like we before I went to college?" He grinned in her direction.

"Game on, Seaweed Brain. I've been waiting for this since you left. I'm going to kick your butt like last time."

"I'll catch you later. I have to go unpack," he waved. She smiled in return, "Cool. 6:00 tonight. You and me, sword fighting arena."

Her smile left him slightly breathless, but he managed to compose himself. After all, she was like his younger sister. Chill Perce, chill, he chanted to himself. Soon after unpacking, he began thinking about his meeting with Zeus tomorrow. Why would he have called him now, a semester before graduation?

5:45 PM—

"A quarter to 6," Percy muttered as he started putting on his sparring outfit. He checked his hair to make sure it was slightly gelled up before he left his cabin.

Annabeth was already there, punctual as usual. Percy couldn't believe that it was her. The little girl he had known since he was 13, and she was 7, had grown up to be such a beautiful young lady.

Annabeth looked at him knowingly, "Seaweed Brain, you going to just sit there staring with a blank look on your face? Hurry up. I don't have all day."

Her voice jolted him out of his daydream. He made the first move as his sword deflected off her upraised arm. After a few strokes, he felt himself fall into their familiar sparring routine from his teenage years. All his childhood memories were being brought back with a revived sense; Annabeth could sense it too. This was the guy, whom she had considered her older brother that had taught her how to spar.

The spar ended at a deadlock, both of them barely scathed.

"Tie?" Percy asked first.

"You afraid, Seaweed Brain?" she smirked once more. "Fine, just this once since you're out of shape."

"Don't you wish, Wise Girl."

"Go back to your cabin, loser. We have to be at Olympus bright and early tomorrow morning," she flashed him a smile before heading towards the Athena cabin.

Make sure to read, review, fave, follow. Constructive criticism is appreciated. To those who have seen the movie, if you have any pointers for the story line, feel free to suggest. I'll try to update often since I'm on winter break, but that all depends on general interest too. So, review and fave.