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 8

Snape hadn't been surprised when he saw that Potter was at Hogwarts while all the other third years, and above, had gone to Hogsmead. Minerva had told him that the Dursley's hadn't signed his form.

"Thanks, Severus," Lupin said.

"You should drink that right away," Snape said, glaring at Potter.

"I will do that."

"I have a cauldronful if you need more," he said and he left.

When he returned to his office he thought over things. Why hadn't Potter given his aunt the form to sign? Was he just being lazy? Personally Snape believed that the boy was just being lazy and didn't want to do something as simple as giving her the form. An hour later Lupin came back with the empty goblet.

"I'm surprised that Harry didn't go to Hogsmead," he said to Snape.

"Probably too lazy to think about giving his guardian the form," he said.

Lupin gave him an odd look and then asked, "Why do you hate him?"

"Because he gives me the creeps," Snape said, "And I'm still not over the fact that James isn't his father."

"Yeah, I was shocked by that."

The Halloween feast was always something that Snape couldn't understand why anyone would want to celebrate. It was a time of personal pain for Snape, as Lily had died on Halloween. Of course no one seemed to care about that. He saw Potter, with his friends, and noticed that Petunia wasn't in Great Hall. He looked over at Dumbledore, who didn't look back. He saw his daughter eating her food but she did look up at him.

Where the heck was she at?

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"I wouldn't do that, if I were you," Petunia told Sirius as the Fat Lady screamed and bolted.

He turned around to face her.

"What are you doing here?" he asked.

"Saving your butt from going back to Azkaban," she answered. "I know that you didn't do what their claiming that you did."

"I don't see why you care," he said.

Petunia rolled her eyes and said, "If my sister trusted you, then I do. And anyway, you're in no position to refuse any kind of help. You're wanted, you just broke into Hogwarts, and you were about to damage property. What I want to know is why are you so determined to get into Gryffindor tower?"

"The rat," he stated.

"The what?" Petunia asked, confused.

"The rat," he repeated, "Ronald Weasley's rat is Peter Pettigrew. That's why I broke out of Azkaban. Peter is in perfect position to tell Lord Voldemort everything."

"Okay, so you want to get the rat and do what?"

"Kill him," Sirius answered.

"Well you're not killing anyone," Petunia told him, "And let me handle getting the rat. You get the Hades out of here before the Headmaster discovers that you're here."

"Oh and what can I muggle-."

"Do not use that word," Petunia cut in, "I have…skills. Just trust me or you'll end up in more trouble than you can even begin to imagine."

"Fine, but you better know what you're doing."

"Oh trust me, I do," Petunia said.

Sirius changed back into a dog and ran off.

"Sometimes I wonder what I've signed up for," Petunia said and she used her magic to get through and into Gryffindor tower.

When Petunia entered the boy's dorm she closed her eyes and focused on the rat. Sirius said that he was really Peter Pettigrew. Petunia had only met the little monster, once, and it seemed that the boy loved being around people that were important. If this Peter fellow caused the death of her sister then she had the right to punish him. Very slowly and painfully!

Suddenly something caught in her web and the rat shot forward and landed in her hand. She looked at it, and saw that it had a missing toe. As she turned to leave she noticed something else. Walking over she noticed that it was the form that Harry had showed Vernon.

"Sometimes I wonder about you," she said and she took it.

She left with the rat.

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A/N: I'm going to end the chapter here. I will be working on the next chapter and have it up.