A/N: In this Alternate Universe Percy is 10 months older then his brother Theseus (Theo) he was born October 2nd. Characters will act OOC especially Percy but that will be explained in the Future. While Percy and his brother are Rivals, Theseus isn't an idiot like every other with Percy having a brother. Theseus will be a smart character in his own right he will also not be a complete and udder jerk he won't ever be a model citizen but he won't be entirely two dimensional. Percy on the other hand will be much more manipulative then in cannon and smarter because cannon Percy was an idiot. I came up with this idea by rereading Titan's curse and imagining Percy getting lost in a city in Arizona or something to fulfill the prophecy. Percy will do things like that in this book and twist interpretations to better suit his purposes. While this is a retelling of cannon, the plot will largely differentiate in certain areas due to the ripple effect.

Disclaimer: I do not own Percy Jackson or Harry Potter (references)

Part of this book is copied directly from Percy Jackson and The Lightning Thief

My name is Percy Jackson.

I'm twelve years old. Until a few months ago, I was a boarding student at Yancy Academy, a private school for troubled kids in upstate New York.

Am I a troubled kid?

Yeah. You could say that.

Growing up I always knew I was different. When I was 9, I ended up on the Roof of my School when I was 10 I turned my desk into water. After that incident I decided I was a Wizard and eagerly awaited my Hogwarts letter on my eleventh birthday. Suffice to say I wasn't happy when it didn't come. After moving past the heartbreak of not being a wizard. I realized I was something else, something more..

It all began with a Field Trip with Yancy Academy, we were going to a Museum to look at some Ancient Greek and Roman stuff.

While it wasn't quite necessarily my favorite field trip, It was still better then sitting in Class all day. Mr. Brunner, our latin teacher was leading the field trip along with the Pre Algebra teacher Mrs. Dodds.

Mr. Brunner was surprisingly cool for a middle aged man in a wheelchair. He would do historical re enactments of battles in Greek Mythology. He often came to class decked out in Roman Armor and would waive a sword around, there were even a few times he brought wooden swords to class and let us swordfight,

Mr. Brunner always seemed to focus on me and my brother Theo more then anyone else. He didn't seem to get that we had both ADHD and dyslexia. He actually expected us to be better then everyone else, well except for maybe Theo's friend Grover. He was a teacher's pet if I ever saw one, he seemed to spend more time with Mr. Brunner then he did with anyone else, what made it especially odd was that they pretended not to know each other.

Earlier today, Mr. Brunner had actually gotten mad at Theo and me for not knowing why Greek Mythology was at all relevant today. It was almost as if he believed this stuff.

But that would be crazy, no one actually believes in this crap it's a myth, I mused as I sat down on the fountain to eat my lunch. Grover silently sat next to me and Theo sat next to him. Grover always had some weird obsession with me and Theo. He shared a room with the two of us, and always tried to make sure we all stayed together no matter how much I tried to distance myself he was always nearby. It was actually a little creepy.

Unfortunately my lunch was interrupted by Nancy Bobofit dumping her lunch on Grover's lap. Theo shot up in anger and went to punch Nancy. I quickly rose to try to placate him since it seemed every time Theo got in trouble I did too, and I really wanted to make it through the year without being expelled this year.

Theo lowered his fist and I breathed a sigh of relief. I blinked for half a second and I could have sworn the water grabbed Nancy and dropped her in the Fountain as she was now on her butt completely drenched sitting in the fountain. Apparently I wasn't the only one who saw what I did, because I heard some of the kids whispering:

"Did you see-"

"-the water-"

"-like it grabbed her-"

I turned around and saw Mrs. Dodds looming over us.

"They pushed me!" Nancy wailed.

I was so sure it wasn't me this time, but I knew she would never believe me.

Mrs. Dodds turned to glare at us;

"Jackson! Jackson!" She snarled. "Come with me."

"Wait!" Grover yelped. "It was me. I pushed her."

I stared at him, stunned. I couldn't believe he was trying to cover for us.

Mrs. Dodds scared Grover to death. She glared at him so hard his whiskery chin trembled.

"I don't think so, Mr. Underwood," she said.

"But-"

"You-will-stay-here."

Grover looked at us desperately.

"It's okay, man," Theo told him. "Thanks for trying."

He gave us a halfhearted grin, as if he thought we were walking towards our own deaths. I barely resisted the urge to snort at the notion, it would probably just get us in even more trouble. Seriously the worst she could do was expel us, more likely however we would be stuck with detention for at least a month.

"Now!" Mrs. Dodds barked at us.

I turned to face her but she was no longer there. She was standing at the museum entrance, way at the top of the steps, gesturing impatiently at me to come on. How'd she get there so fast?

Theo was hesitant, he kept glancing back at Grover, I didn't know why he would be so worried it's not like we were going to die. I on the other hand kept my eyes glued to Mrs. Dodds I was curious as to how she moved so fast.

Mrs. Dodds vanished before my eyes, she was now standing inside the building at the end of the entrance hall. I found myself suddenly understanding Grover's apprehension. At the time I found myself growing excited perhaps she could tell me how I teleported onto the roof all those years ago.

We followed her into the Greek and Roman section of the museum. Except for us the gallery was empty.

Mrs. Dodds stood with her arms crossed in front of a big marble frieze of the Greek gods. She was making this weird growling noise.

Theo's face was white and I was feeling pretty unnerved myself.

"You boys have been giving us problems." Mrs, Dodds accused us.

:"So sorry ma'am, it won't happen again." Theo said nervously.

Something told me she wasn't talking about Nancy.

She tugged on the cuffs of her leather jacket.

"Did you really think you would get away with it?"

The look in her eyes was beyond mad. It was evil.

She's a teacher, I thought nervously. It's not like she can hurt us. That didn't do anything to reassure me.

"I'll-I'll be better, ma'am." Theo said trembling in fear.

Thunder shook the building. "We are not fools, Jackson," Mrs. Dodds said. "It was only a matter of time before we found you out. Confess, and you will suffer less pain."

I didn't know what she was talking I figured it wasn't a good idea to let her know that.

"Well?" she demanded.

Unfortunately Theo had other plans; "Ma'am, I don't..."

"Your time is up," she hissed.

Then the weirdest thing happened. Her eyes took on a demonic glow. Her fingers stretched, turning into razor sharp talons. Her jacket melted into large, leathery wings. She wasn't human. She was a shriveled demon with bat wings and claws and a mouth full of yellow fangs, and she was trying to kill us.

Then things got even stranger.

Mr. Brunner, who'd been out in front of the museum a minute before, wheeled his chair into the doorway of the gallery, holding two pens in his hand.

"What ho, Theseus, Perseus!" he shouted, and tossed the pens through the air with perfect precision the Pen landing in the palm of my hand. The craziest thing happened; the very moment the pen hit my hand it turned into a three foot long bronze sword. The Greek word Anaklusmos was engraved in the blade, that I somehow knew meant Riptide. I didn't have much time to ponder my revelation as Mrs. Dodds lunged at Theseus.

No matter how much he annoyed me I couldn't let him die. So I lunged at the weird demon thing attacking my brother. I swung my sword and it sliced through the creature's wing removing it completely.

Mrs. Dodds careened towards the ground where Percy was standing.

With a yelp, Theo rolled out of the way of Mrs. Dodds talons and he snatched the ballpoint pen out of the air, but when it hit his hand it too became a sword. I rushed to my brothers side and we both stood facing towards Mrs. Dodds with our swords in hand.

Mrs. Dodds spun toward us with a murderous look in her eyes. I glared at her determinedly as She snarled,

"Die, boys!"

And she flew straight at me. Absolute terror ran through my body. I swung the sword with a grace I never knew I had.

The blades of our swords hit her at the same time, Theo hit her shoulder and mine pierced her stomach and passed clean through her body as if she was made of water. Hisss! Mrs. Dodds evaporated before our eyes, like a sand castle in a power fan.

She exploded into yellow powder, vaporized on the spot, leaving nothing but the smell of sulfur a dying screech and a chill of evil lingered in the air, it felt as if she was still in the shadows watching us with her glowing red eyes.

We were alone.

There was a ballpoint pen in our hands.

Mr. Brunner wasn't there. Nobody was there but us.

Theo turned to me shakily and said; "Did that really just happen?"

"You mean did we just kill our Pre algebra teacher?" I asked rhetorically "Yeah we did."

"Oh thank God!" Theo exclaimed. "I thought we ate some magic mushrooms or something."

I snorted before uncapping the pen again and watching as it turned into a sword once again. "Fascinating, I muttered before recapping it.

I turned to my brother; "Shall we head back?"

Grover was sitting by the fountain, a museum map tented over his head. Nancy Bobofit was still standing there, soaked from her swim in the fountain, grumbling to her ugly friends. When she saw me, she said, "I hope Mrs. Kerr whipped your butts."

Theo said, "Who?"

"Our teacher. Duh!"

I blinked. We have no teacher named Mrs. Kerr. Theo asked Nancy what she was talking about.

She just rolled her eyes and turned away.

Theo asked Grover where Mrs. Dodds was.

He said, "Who?"

But he hesitated, and he wouldn't look at me, so I realized he knew what was going on and what she was.

"Not funny, man," Theo told him. "This is serious."

My idiotic brother clearly didn't get that he was trying to hide something; realizing this I quickly shoved Riptide deep in my pocket hiding it from view.

Thunder boomed overhead.

I saw Mr. Brunner sitting under his red umbrella, reading his book, as if he'd never moved.

He looked up, a little distracted. "Ah, that would be my pen. Please bring your own writing utensil in the future, Monsieurs Jackson."

Theseus handed Mr. Brunner his pen. He hadn't even realized he was still holding it.

Mr. Brunner shifted his gaze onto me.

"I believe I let you borrow one of my pens Perseus." He said.

I believe you are mistaken, Sir." I replied evenly.

He fixed me with a glare, before hesitantly nodding his head in acceptance.

"Sir," Theo asked, "where's Mrs. Dodds?"

He stared at him with a confused expression not meeting our eyes."Who?"

"The other chaperone. Mrs. Dodds. The pre-algebra teacher." I resisted the urge to facepalm at his obliviousness to the fact they were trying to hide this.

He frowned and sat forward, looking slightly worried. "Percy, there is no Mrs. Dodds on this trip. As far as I know, there has never been a Mrs. Dodds at Yancy Academy. Are you feeling alright?"