A/N: AU! Harry Potter/Percy Jackson Crossover! And before I start the story, these are the three reasons why it's AU:

-Voldemort got defeated in the First Wizarding War

-Hera does not tamper with Jason and Percy's memories but they bump into each other anyway in San Francisco when Percy was visiting Annabeth

-Rachel does not recite the Prophecy of Seven

Takes place after The Last Olympian, and here's chapter 1! (sorry, it's a little short)

Hermione Granger was busy reading Other Universes and Worlds Other Than Yours by Sibeta Amunet, while waiting for their Defense Against The Dark Arts teacher, Professor Amyna, to come. It was their lesson for today and as usual, Hermione did some advanced reading. Ron Weasley and Harry Potter were busy talking about the upcoming Quidditch World Cup, happening after the school year.

It was their seventh and last year at Hogwarts, and their N.E.W.T.s were finally finished1. They were just having extra lessons, well, for fun. Especially Defense.

The clicking of heels coming through the doors signaling their Defense professor was there. Class today was Gryffindors with Slytherins.

"Good morning class!" Professor Amyna said cheerfully. She was wearing a navy blue long-sleeved shirt and a simple brown wooly vest, and heels and black slacks. She hung her cloak on one of the random racks whilst she was greeted with a monotone reply. "Today, we will be learning about other universes and worlds, other than our world, the wizarding world." A hand went up into the air. "Professor –"

"No, Mister Zabini, don't worry. We are not learning about Muggles." A few sighs, mostly from the Slytherins, could be heard. "Alas, I am not here to teach you about the Muggle world, as it is, Professor Abnegatia's job. But I am here, to teach you, about other magical worlds and people. Such as …" The students waited in anticipation. "Demigods." A soft murmur occurred in the class. "Now," Professor Amyna said silencing the students. "Who can tell me what a demigod is." Typically, Hermione's hand shot up in the air.

"Yes, Miss Granger?" the woman asked politely. "Demigods, or Half-Bloods, are offspring's born to a human and a god, therefore are half-human, half-god," Hermione stated.

"And what kind of gods are these, Miss Granger?"

"They are either Greek gods or Roman gods, of Greek and Roman mythology. Most of them are Greek but when the gods are in their Roman form, their child, with a mortal, will be either the son or daughter of this particular god, with their Roman name, instead of Greek," Hermione finished. "10 points to Gryffindor for a well thorough explanation," Professor Amyna said, as praise to Hermione. Harry and Ron gave their best friend a smile, and she slightly blushed, and smiled back.

The professor then flicked her wand to the windows and the curtains pulled down, making the room quite dim. She then flicked her wand to the ceiling and a screen pulled down. The professor's black crimped hair flew behind her as she walked briskly to the back of the class where a projector was placed. A photo showed on the screen. A photo of three Greek god statues. "Now, who can tell me who these three Greek gods are?" Other than Hermione's, a few people held up their hands. "Miss Greengrass?" the professor called. "From left to right, the Greek gods are, Poseidon, the god of Sea, Zeus, the god of Lightning, and Hades, the god of the Underworld. They're parents are Rhea and Kronos. Also known as the Big Three because they are the gods of the biggest parts of the Earth," Daphne answered. Professor Amyna smiled. "Correct! 5 points to Slytherin." For the past hour, the class discussed about the Greek gods and demigods. Even some Roman gods and demigods. What surprised them was what Professor Amyna asked. "So, does anyone know where demigods train?" Mumbles of no could be heard and heads were shaking. "I do." Everyone's head turned towards the speaker, some went wide-eyed while some gasped. Including Professor Amyna. "You do, Miss Robins2?" She slowly nodded her head. The professor gave her a questioning look and Demelza knew what she was going to ask. The Gryffindor chaser answered immediately. "Yes. I do. That's because …" Demelza hesitated. The Slytherins and Gryffindors leaned at the edge of their seats. "C'mon Demelza!" Ron said. They were all staring at her demanding how the Hade – Merlin she knew where demigods train. She gave in. Demelza took in a deep breath. "Because … I'm a daughter of Hecate."

A/N:

1- Ok, so I searched up le Harry Potter Wiki on N.E.W.T.s and it doesn't say the schedule, sooo I looked at the O.W.L.s schedule and it was around the near end of fifth year. Therefore, I made N.E.W.T.s at the near end of seventh year J

2- Demelza Robins is either actually a fourth year or a fifth year but I made her a seventh year Gryffindor because she's the only decent Gryffindor (I can't choose Lavender or Parvati! I can't really figure out a way to make them demigods. And also, when I looked at Romilda Vane, it just didn't fit. So I chose Demelza) and a non-main protagonist of the Harry Potter series.

YAY! Chapter 1 is done! Sorry if it's quite short and I left you on a cliffy :3 teehee O.O ::dodges thrown tomatoes:: Don't worry! Chapter 2 will be up in a while! :D

Review, please! I'll give you a cookie! ( : : ) see! (it's a ploy to get you to review)