Title: Petunia's Third Year

Rating: K

Summary: Petunia Evans returns for her third year. Lucius is gone and Narcissa is in her last year. Rumors abound Slytherin House and James and his friends are bound to make Severus, Remus, Lily and her year hell. Sequel to Petunia's Second Year! 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 12: Revealing His Secret

Petunia was dead tired when she returned to the common room. Thankfully there was no one around except for Severus and Narcissa. Narcissa looked just as bad as Petunia felt. They both turned when she entered.

"Where's Lily at?" Severus asked her.

"I'm afraid that she's been hurt," Petunia told him.

He got to his feet but Petunia said, "I need to tell you both something."

"Why do I have a feeling that I'm not going to like this," Narcissa said.

"You're not going to," Petunia verified and then, "Remember that I've been brewing the Wolfbane for werewolves."

"Everyone knows that," Narcissa stated.

"What I didn't tell you is that Remus takes the potion as well," Petunia confessed.

They stared at her and then Severus said, "That wolf bit Lily."

"It wasn't his fault," she said, "Something happened to turn him nuts. That potion is to keep him safe but something happened."

Petunia could see Severus getting angry and she didn't blame him. However Narcissa said, "As the potion ever failed?"

"No," Petunia answered.

"Then you need to find out what happened," she said, "And, Severus, stop acting as though you're about to destroy this castle. If someone tampered with the potion then it's not Remus fault."

"And he's our friend," Petunia stated. "If Black, or anyone, figured out that Remus is a werewolf then they had a good chance of ruining the potion."

"Fine, but I still don't like it."

"Trust me, I understand," Petunia said.

Remus was released from the wing a week later. Lily was always crying and Petunia figured that she had discovered the truth about why she now had a scar on her arm. Petunia worked on trying to figure out who had tampered with the potion and to her horror she found that it was in the cauldron. Though only the cauldron that she brewed Remus batch! She told Dumbledore this when she found out.

"Then someone in the school did it," he said.

"I think that I might know how to figure this out."

When she got back to her dorm she tapped her trunk three times with her wand and the contents vanished. This trunk was illegal but she personally didn't care about the rules. She climbed down the stairs and went down into a lab that was within the trunk. She looked through all the powders that she had until she found the one that she was looking for. When she got out everything returned to normal.

She then headed down to the lab and sprinkled the area with the powder. Focusing her magic she sent out a burst of light and the whole room came into focus. Standing over the cauldron was Pettigrew. She summoned Dumbledore to see the results himself.

"Thankfully he doesn't know that it's Wolfbane," he said.

"I do hope that something will be done," she told him.

Dumbledore sighed and said, "I'm afraid that I will have no choice."

She liked that line.

December meant the expulsion of Peter Pettigrew for the crime, not of causing Lily to become infected, but trying to steal Petunia's potion to market as his own. Even though the second year was confused by this it was Dumbledore's word and Dumbledore's word was golden. Severus shifted from his anger at what Remus had done to what Peter had done to Remus to cause Lily to become infected. Due to the fact that the Ministry had no clue that Remus was a werewolf nothing was done.

It was declared a lone wolf attack, which was fine with Petunia. Mortal ignorance sometimes worked in one's favor. The weeks went by quickly and before Petunia, and her friends knew, it was the winter break. Time to go after a locket!

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A/N: I know that, in cannon, Voldemort hid his locket Horcrux in the cave after Sirius brother had become a Death Eater. In this one he put it in before that happened. I just want to clear that up before I get some comments about the timing.