Title: Snape's Demigod Daughter

Rating: T

Summary: Cassandra Snape comes to Hogwarts during Harry's third year. She's different from other students right from the start. And she has a very nasty view of the word 'Muggle.' To make things even stranger, for Harry, she's Petunia Dursley's sister and brings her sister along for the ride. A crossover of Harry Potter and Percy Jackson.

Disclaimer: I don't own any of Rowling or Riordan's characters and I'm making nothing from this.

Chapter 4

"I swear I'm going to kill myself a Weasley," Cassandra snarled as she entered the room that her sister was staying.

"What happened?" Petunia asked.

"He went and told Professor McGonagall that I was cheating," she said, "I was able to do the lesson, which really wasn't a lesson, and he accused me of cheating. When is writing down notes cheating?"

"Want me to send hellhounds after him?" Petunia asked.

"No, I just want to have something to do that doesn't have the word 'Hogwarts' on it," she said.

"So what do you have this afternoon?" Petunia asked her.

"Care of Magical Creatures," she answered. "I'm taking my forked staff with me. Never know when it's going to be needed."

"True, oh I'm going to be visiting a shop owner after your lesson," Petunia told her.

"Really," Cassandra said, interested, "A regular shop or a magical one?"

"Regular," she answered. "Want to come? Get your mind off of Ronald Weasley."

"Yeah, I'll come," she said and left, her books in hand.

She made another offering to her mother and then, after finishing her meal, headed down to a hut that was on her timetable. She looked around, enjoying the peace and calm before the morons showed up. Personally she couldn't understand how a whole group of people could be so annoying and loud. For a couple of minutes she spent time hunting down some herbs and roots that she intended to ground down. She was low on Horehound and Wolfbane, but found both of them without any problems.

Dusting herself off, she placed them in bags and then headed for class.

"Oh look who it is, the girl that thinks that she's so hot," Ronald Weasley taunted when she approached.

"Yeah, I'm so hot that I'm thinking about turning you into a tree," Cassandra snarled.

"You can't do that," Granger said, "It against the-."

She snapped her fingers and Ronald Weasley was a tree. "What were you saying?"

Granger gasped and backed away.

"Let my friend go?" Harry Potter ordered.

"You're not my father," she snarled, "And he's got a big mouth and should learn to shut it. I didn't start on him, but he sure as heck loved to start on me."

"I said, let-him-go," Potter said through clenched teeth.

"No, I'm not," Cassandra countered.

The wand was at once out, which she made shatter into a dozen pieces. Everyone gasped, some screamed in horror, but she didn't back down. Potter hated the fact that she wasn't a little weakling that could think for herself. He was just like all the other bigots that thought that they were better than everyone else. And then the scariest thing ever happened, that Cassandra wasn't expecting and neither was anyone else.

His eyes and grown dark, like Nico's did, and then several skeletons came out of the ground. What the Hades was going on here?

"You're doing this," Granger said.

"No, I'm not," Cassandra told her.

"She's a dark witch!" someone said.

"Return those dead men back to the ground, Harry James Potter," came a voice that she knew all to well.

Her sister, who had been a falcon again, had appeared and she didn't look happy.

"She's doing it!"

"No, you are," Petunia said.

"Should have known that you would of-."

"I said return the dead men back to the Underworld, or so help me I will do it myself," Petunia cut in, "And we're going for a very long trip to have a very long talk with someone."

"I'm not going anywhere with you," Harry told her.

Petunia made the skeletons vanish and then they vanished.

"SHE TOOK HARRY," Granger screamed.

Cassandra turned and vanished herself. She had a ton of things to think about.

1111111111111111111111111111111111111111111111111111111111111111111111111111111111111

Harry was really going to have a talk with Dumbledore when he got back. How dare his Aunt take him from Hogwarts just because her stupid sister had raised the dead! And how dare she accuse him of doing it. He didn't practice dark magic and he never would. When they appeared they were in a low room that looked like something out of a nightmare.

"Lord Hades, we have a problem," his Aunt called out and something bended and the most horrible man that Harry had ever seen appeared.

This man could give Voldemort a run for his money.

"Well look what we have here," he said.

"This child raised the dead," Petunia told him.

He looked at her and then said, "And you assume that the child is mine."

"There's only one god that can raise the dead," she said, "Me and Cassandra are more limited to those that have been wronged and denied justice."

"James Potter is my father!" Harry stated at once.

"No, your mine," Hades said, glaring at him.

"Zeus will have a field day," Petunia told him.

"Do I care what Zeus thinks?" he snarled, "Not after that what happened."

"Heard your helm got stolen," she said.

"Don't remind me," Hades snapped. "Take him to camp this summer."

"Yes, Hades," she said. "I also think that we should cover the thing that my sister talked about."

He nodded and then walked over to Harry. Harry glared at him and then Hades pressed his finger to Harry's scar. Harry hissed as something was removed from his head. Harry blacked out.

111111111111111111111111111111111111111111111111111111111111111111111111111111111111

"What did your sister do to Harry?" Hermione demanded.

"Most likely took him to see my Uncle," Cassandra snarled. "Now leave me alone before I hex you or something."

And she stormed off.

Petunia came back, with Harry, and told her what had happened. Cassandra shuttered thinking about Harry being the son of Hades. That was something that just wasn't right. But, at least something good had happened. No soul fragment to worry about. Of course that hadn't changed Harry's view about her, which was enough to make her groan.

1111111111111111111111111111111111111111111111111111111111111111111111111111111111111

A/N: Thanks for all of your reviews.