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 5

"So what exactly are we doing here?" Cassandra asked her sister.

It had been a week since Harry had come back from the Underworld and things had gotten worst. He kept glaring at her as though she was about do something dark and evil at any given moment. Petunia told her that Hades would sit his son right. Cassandra really hoped so.

"We're doing that thing that I told you that I was going to do," she answered.

Cassandra groaned when she remembered what it was. "I'm sorry that I forgot."

"That's alright," Petunia said, "It seems having Harry trouble is a valid excuse to forget. Come on, I want to get this over before their government catches us."

Cassandra didn't understand what the big deal was about the world knowing about witches and wizards. Heck, in the States they have Wicca and traditional forms of the craft. They walk around wearing all sorts of witchy jewelry and sometimes no jewelry. Personally she thought the whole thing was a complete waste of time.

"Sis, don't they know that people know about witches?" she asked her.

"They want to pretend that they don't," Petunia told her. "Trust me, if Lily knew that I was a demigod she would have freaked out."

"Do you think she would have hated you?" Cassandra asked her.

"I don't know," Petunia said, thinking about this for a moment, "I'm hoping that she wouldn't have had."

The man in question was having a hard time with some spirits that were bothering him. Cassandra wasn't as good in this area as Petunia was, so she just listened as he talked about what had happened. When he was finished she gave an amount to get rid of the problem.

"Are you sure that you can do this?" he asked her.

"Of course," Petunia said and she gave Cassandra a smile as well. "But it's going to take a couple of hours."

"Just let me know when it's done," he told her.

"No problem," Petunia said and she escorted him out of the house.

"Is it going to take that long?" Cassandra asked her.

"Dear Hera, I hope not," Petunia said, "First we need to locate where it's coming from and then we can get a feel of what it is."

Cassandra nodded and they went a looking.

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"Where's my Aunt, Professor?" Harry asked Professor McGonagall, "And that sister of hers?"

"Mr. Potter, I have no idea where they are," she said, "And the Headmaster has told me that Miss Snape got permission to leave the grounds with her sister."

"WHAT! You allowed them to leave."

She gave him a look and Ron warned, "Don't press it."

"What, I'm not allowed to voice my concerns," Harry told him.

"Mr. Potter, Miss Snape hasn't done anything wrong and hasn't broken any laws," she told him, "So I advise that you take your dislike for her and shove it. You have no right to attack her just because you don't like who her father is."

"But-."

"Don't butt me," McGonagall cut in. "The disrespect that you have for Professor Snape will end now."

Harry glared at her but dropped it.

When Snape's brat daughter came back she looked worn and tired. Hermione and Ron both glared at her but she walked past them and headed up to her dorm, yawning.

"I bet those two were doing something evil," Ron said. "I wouldn't put anything past them."

Ron was still mad about the whole 'chair' incident.

"I know, but none of the staff want to hear reason," Harry told him. "We need to get them caught doing something dark."

"But how?" Hermione asked.

"I don't know, but I will figure out a plan."

"You will not do anything to her," Hades told his son off. Harry was dreaming and he found himself face to face with the man that claimed him as a son. "She's the only defense that your school has. Trust me; there are monsters out there that want to eat you. But all you can think about his revenge and holding a grudge. Holding a grudge is a fatal flaw and it will get you killed. Do you want Tom Riddle to destroy everything?"

"No, but-."

"No, butts, Harry. She's to train you on how to use your sword and to protect you from the monsters. She's not evil, and neither is your Aunt. Or have you forgotten what happened when it came out that you could talk to snakes?"

"Don't remind me," Harry muttered.

"You didn't like it when people thought that you were a dark wizard. That even will come back to haunt you soon. Anyone will look for an excuse to hurt those that they think are different. That's why no one should ever find out that you're a demigod. Got that! Especially Tom Riddle."

Harry wanted to protest but decided against it. That's when he woke up.

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"Still tired?" McGonagall asked Cassandra.

"Yeah," she said. "Get rid of spirits is hard and Petunia has been doing it a lot longer than I have."

"I still can't believe that Petunia is a witch," she said.

"Demigod daughter of Hecate, but, yeah, a witch," she said.

"How how are you fairing in Gryffindor Tower?" she asked her.

Cassandra groaned and said, "Not well. They all think that I'm dark and evil. Though, I couldn't believe that Professor Dumbledore was able to reverse the spell."

"He's very gifted," McGonagall remarked. "He has to be if he wants to continue to make the school safe. And with Sirius Black on the loose, well-."

"I understand," Cassandra said.

"I'm glad that you do," she answered.

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A/N: Sorry about the long wait. I thought that I had lost this story until I found it on my jump drive. I hope that you enjoy the chapter and I will be posting more often.