A/N: Well, to get over my writer's block and as a warmup, I wrote this beginning to a story I might write. I'd like to explore the possibilities of a demigod muggleborn and how the powers would interact. I think, for instance, Percy and Annabeth would be quite a bit stronger than other wizards and witches due to their innate magic. Also, the similarities between the characters make it easier to mix the two.

Disclaimer: I don't own PJO or the HP Universe. I do own about three bananas, some cheese, and a desk.

Green eyes stared into a similar shade. They searched up and down, black hair was donned by both persons, though the frailer one's hair covered a pale scar. One had a sword, the other a wand - though, in time, they'd both have each. Harry Potter and Percy Jackson could be mistaken for siblings, perhaps, and they had ended in the same cabin on the train.

"My name's Percy, what's yours?"

"Harry, Harry Potter."

"What house do you think you'll get into?"

"Probably Gryffindor. That's what Hagrid said, anyway. My parents were apparently both in Gryffindor."

"I think I'll go there, too. A man named Dumbledore told me about the houses, and if that's where the brave go I'll go there," Percy said, laughing, "I'm not terribly smart or cunning. I suppose Hufflepuff could be it, too, but Gabe always says I'm lazy," he pouted.

"My aunt and uncle always say I'm lazy, too," Harry cringed, memories surfacing of beatings past.

"Huh? Why do you live with your aunt and uncle?" Percy questioned.

Harry looked surprised, everyone else seemed to know his history pretty well. "Have you not heard of me?"

Percy's face soured. "Why would I?"

Wincing, Harry apologised. "Sorry, it's just… everyone I've met so far has heard of me. Apparently, when I was a baby, a dark lord killed my parents and when he tried to kill me he was killed. Nobody knows how it happened."

"Oh. Sorry for prying, that can't be easy."

"It isn't. I live with my aunt and uncle, they don't like magic at all. They think it's unnatural, they call me 'freak'."

Sea green eyes hardened. "I hate people like that. My stepdad Gabriel says things like that too. He hits my mom. One day, I'm going to kill him."

Harry's eyes widened. He'd never seen such ferocity or certainty in anyone's face. He elected to remain quiet. Not long afterwards, a bushy-haired girl knocked on the door to the compartment.

"Is this cabin full?" the girl asked, looking at them shyly.

"Does it look like it?" Percy replied sarcastically.

The girl flushed. "Well, excuse me! I was being polite."

"No, it's not full. Feel free to join us."

The girl took a moment to gather herself. "Hello, my name is Hermione Granger. It's nice to meet you," she introduced.

"I'm Percy Jackson. He's-"

"Harry Potter." the other boy ended.

"Oh, I know all about you, of course — I got a few extra books, for background reading, and you're in Modern Magical History and The Rise and Fall of the Dark Arts and Great Wizarding Events of the Twentieth Century."

Percy stared, surprised, while Harry grimaced. "Wow, is he really that famous?"

"Of course! He defeated the Dark Lord Voldemort!"

"Yeah, and my parents died!" Harry exclaimed, "I really don't understand why-" he paused, taking a deep breath, "Look, can we not talk about my fame right in front of me?"

"Sorry, Harry. I didn't realise it was so personal."

Hermione also apologised, looking close to tears. "I'm sorry, Harry, I really am - it's just, I didn't-" she cut off, a choking noise in her throat.

Another girl knocked at the door, Percy opening the door. A girl stood before them, blonde haired and gray-eyed. Recognition flared in Percy's eyes before it died away, leaving behind a moment of dullness.

"Thanks, I'm Annabeth. Annabeth Chase."

"Have I met you before?" Percy asked, recognising the accent as American.

"Maybe. Come to think of it, you do look familiar. Does the name Camp Half-blood mean anything to you?"

"Yeah!"

"That's it. We must've seen each other there," she said, before turning and introducing herself to the other two. Hermione swallowed back her tears and returned the introduction, though more subdued this time. Awkward silence filled the cabin as she sat across from Percy, next to Harry. She studied him intently, making him blush.

"Jeez, why are you staring at me like that?"

She blushed a little too. "It's not like that! I'm just trying to figure out if I've seen you at Camp before. I feel like I've met you before, a lot more than can be accounted for by simply seeing you at Camp."

Hermione perked up a little, the way this girl carried herself and spoke made her think that this was someone she could be friends with. She stayed quiet, but listened closely.

"To be honest, you're a little too familiar. It's almost creepy."

"You're more than a little creepy.

A/N: That's all for now, folks. I might extend it when I've got writer's block on my main story, but don't expect much.

Thanks for reading! Reviews are a beautiful thing.