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 6

Cassandra knew that Harry still hated her and that really hurt. In battle you can't have someone not have your back. It could end up getting you killed. Petunia, of course, blamed her father for the fact that Harry hated her.

"If that man would get a life, maybe he would have a wife."

"You could marry him, if you weren't married yourself."

Petunia went green and said, "I would rather burn to death."

When Harry arrived for training he had his two friends with him, both in full glaring mode. They sat down and I made my sword appear. At once the wands came out and she said. "If I wanted to kill Harry, he would be dead. Of course I would be in Tartarus as Hades would make sure I went there. You can stop pulling out those wands. I'm not going to hurt him."

"Like I believe that," Weasley said.

Cassandra rolled her eyes.

She showed Harry how to block and when she knocked Harry to the ground she got cursed. She groaned and Granger said, "I told you we would attack you if you hurt him."

"Dear gods, he's not a child," she said. "He's supposed to get hurt."

"Not while we're around," she snarled. "Do that again and I'm knocking you out."

"Fine," she muttered and she had Harry come after her.

She knocked him off his feet and Granger hit her again. She walked over and snapped her wand. "Get out! Harry isn't going to learn if you keep knocking me out, or attempting to."

"I'll be fine," Harry said. "And she's right."

"I can't believe that you're defending her," Granger said, clutching her broken wand. "And I'm going to get you expelled."

They hurried off and Cassandra said, "I'm not intending to hurt you. You just have to know how to use that sword. There are monsters out there that will kill you and we don't want Hades mad at us. Now let's start again."

When it was over Cassandra sat down and opened her book. Now that Granger and Weasley were gone, and Harry on his way back to the castle, she could have some peace and quiet. Training demigods was hard.

"Well, well, what do we have here?" the snotty voice of Draco Malfoy said. "Snape, the betrayer."

Cassandra looked up from her book and asked, "What the Hades do you three want?"

"We want to pay you back for making our house look bad."

"Yeah, well you should look into a mirror," she snarled. "Because the person making Slytherin House look bad would be staring right back at you."

"How dare you insult me, Snape, wait until-."

Cassandra snapped her fingers and they were turned into goats. She grinned and said, "You were saying, Malfoy, about your father." She laughed and then made them vanish. Right into Dumbledore's brother's goat herd. "Happy mating, Malfoy! Oh this is going to be so much fun."

She changed into an owl and flew back to the castle.

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A figure watched the girl change and fly back to the castle. He had to admit, for a Snape, she had spunk. Of course the little nit deserved what he and his friends had gotten. He changed into a dog and hurried back to the shack. Things have gotten to be a whole lot more interesting.

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A/N: Sorry for the short chapter, they will be far and in-between.