Title: The Awesomeness of Severus Snape

Rating: K

Summary: Severus Snape is the son of Hades and for years he's told no one. When his father's thorn comes back to power he's finally allowed to reveal that he's a demigod and boy does he come up with reasons why he's late, why he can insult Sirius, why he changes in the classroom, and why he's got unusual pets. Tom will come to fear him, like he will come to fear Harry. A Percy Jackson/Harry Potter crossover and takes place during Harry's fifth year.

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

Chapter 1: I'm Finally Allowed to Tell, Joy

Severus POV

"You summoned me, father," I said after I shadow traveled to the Underworld.

My father, Lord Hades, was looking out over the Fields of Punishment, grinning. "Oh joy, another Death Eater getting punished." He turned and faced me, "I want you to reveal that you're a demigod. You will be allowed to bring on soul back with you to the land of the living, and I would like it to be another demigod."

"I could bring Lily, she's a daughter of Ares," I said.

"Permitted," he told me and I felt joy as I now had the love of my life back.

Back when I had been a student I found Lily fighting a monster. With the help of my powers as Hades son I helped her defeat it. Lily revealed that she was the daughter of Ares and I told her that I was the son of Hades. War and death, they are an unmatched combination. We had to pretend to no longer be friends but we were an unknown couple and Harry had been born of this union, though Hades kept him in the Lotus Hotel and she faked that she was pregnant by James. Harry was really eighteen, not fifteen.

He was also a legacy of Hades and Ares. Having Lily back would mean much to his transition to this part of his life.

"I will have her waiting for you in London," my father went on.

"Thanks," I said, "Any quest that you want me to do?"

"Get the scar Horcrux and the locket," he said, "And I want you to make him fear death, as he claims that he doesn't fear us. Tell your son the truth about his age, his heritage, and about you being his father. He's going to need someone else, other than that damn mortal Sirius Black."

"Of course," I said and I shadowed out of there.

Lily was waiting on me in London, outside of the Black House. I ran over and wrapped my arms around her and kissed her. She responded at once, moaning with pleasure. It took everything to pull away from her, not wanting to make an idiot of myself.

"Dear Hera, I thought I would never kiss you again," Lily said.

"My love, I never thought I would either," I said, kissing her hand, "You're beautiful!"

"And a lot better looking than my siblings," she remarked and I grinned. "So where's Harry at?"

"Inside the Black house," I told her, "But you can't go in without breaking the charm."

"Like I care about the damn charm," she said, her Ares temper flaring, "I want to see our son."

"Then we're going to have to break the charm," I told her and I apparated her right into the house, the alarms going off.

At once a dozen Order members and the Weasley kids were running. They must be having dinner. At once they drew their wands, but not at me. But at Lily, who glared at them with such a look that a couple of them trembled.

"Severus is that-."

"You darn right, Albus Dumbledore," Lily said. "How dare you point your wands at me like I'm some follower of Tom Riddle."

"No, this can't be," Black said, "She's dead!"

"Well, I'm back," she told him. "Got a problem with that, you dirty mutt."

"No, that's not Lily," Black said, "She wouldn't have talked to me like that."

"I will talk to you anyway that I wish," Lily told him, "And I know, for a fact, that you have a scar on your butt. I saw it when you ripped your pants during our sixth year and I know that you slept with a bear name Bobo because your mum threatened to burn it and you didn't want to lose your friend."

Alister snickered.

"I'm not talking about Bobo," Black said.

"It was brown with a pink bow," Lily taunted and I laughed at what she said.

"Okay, you've proven that you're Lily," Black suddenly said, "No need to make me feel as though I'm some child."

"How in the name of Heaven did you come back?" Kingsley asked.

"Because I wasn't done with things," she told him, "I'm also doing a favor for Sev's father."

"Tobias."

"Tobias isn't my father," I told Albus.

"But that's impossible," Albus said, "We know that Eileen married Tobias."

"Just because my mum married that piece of filth doesn't make him my father," I told him, "And now that Tom Riddle is back, I can tell who my father is."

They all looked at each other but Lily was beaming at me.

"What are you talking about?" Lupin asked.

"Show them," Lily urged and I pulled my ring off and pressed down on the skull.

At once a long sword appeared, everyone backed away.

"My father is Hades, Lord of the Dead," I told them and I slammed the sword into the floor and it opened up, dead souls coming out. "Accio, Slytherin's locket."

The locket appeared in my hand and I dropped it into the pit, at contact it opened and a figure came out, screaming in pain. It turned and looked at me. "You will never defeat me, Hades son. I will win in the end."

I removed the sword and the pit closed, leaving nothing but silence. "One down, several more to go."

"Dear Merlin, did you see that," Tonks said, "He destroyed-."

"A fragment of Tom's soul," Albus said, "Why didn't you tell us that you're a-."

"Demigod, because father made it clear that I couldn't," I told him, "But now that Tom's back my father wants him to fear death. And that's what I'm supposed to do this year."

"And what's the best way, but bringing back his most famous victim," Lily said to them.

"And there's going to be some changes in my classroom," I told them. "No more putting Slytherin above the other houses. Draco Malfoy is going to find that I don't favor him anymore."

"Would love to see his face when you take points from Slytherin," Lily said to me and I grinned, really grinned.

"This is to weird," Lupin said, "Severus a demigod, soul fragments."

"I'm also a demigod," Lily told him, "Daughter of Ares, God of War."

"And better looking than her siblings, trust me on that assessment," I told them.

"Brain is hurting," Lupin said.

"Will you please knock it off," I said, "Gods, Lupin; you act as though you haven't seen shocking things before."

"This can't be Snape, he's too…human."

"Want to give you some slow acting venom," I asked Ron Weasley.

"Yeah, that's Snape," he said.

"So what are you going to do now that your back?" Albus asked her.

"Take care of a few…things," she said. "We need a word with Harry."

"Alone," I added.

"No, I'm not having him be in the same room with Snape," Black said.

Lily glared at him, but Tonks said, "Only if I'm allowed to stay."

"Fine, but the rest…go," Lily ordered and they all left, except for Harry, Tonks, and us.

"Mum," he cried out.

"Yes, sweetheart," Lily said, tears welling up and coming down her cheek, "Gods, if dad could see me crying."

"Don't worry, it will be our secret," I said.

She extended her arms and Harry rushed and she gave him a huge hug. I had to smile at this scene; I knew how bad the child had it with the Dursley's.

"Sweetheart, I want to have a word with you," she said, "Though I'm sure that Tonks won't glare at what I'm about to tell you."

"What is it?" he asked.

"Harry, you know that you're special," she said, "And I'm not talking about you stopping Tom from destroying everything that we hold dear, but due to your blood. During our fifth year James was really trying to pull us apart. Severus found out that I was a demigod when a monster came onto the grounds and tried to kill me. If it hadn't been for his powers over the dead, I would have joined the line in the Underworld.

"When he told me that he was Hades son, I was worried. Hades and his brothers had made a vow on the River Sty's that they wouldn't sire anymore heroes. However, I found out that he had already gotten cleared by his family and was able to walk around without having to worry about being killed, as long as he didn't fly. I fell in-love with him, Harry, due mainly because he had saved my life dozens of times when the monsters got to bad for me to handle.

"And because war and death are always attracted to each other, it's the nature of the universe. Severus wanted to marry me, but James was determined to get to me first. We went to a Mortal Justice of the Peace and got married. And since it was done in the mortal world, it didn't show up. I had you during my sixth year and Severus father placed you with the Lotus Eaters so that Tom wouldn't know, as he was really starting to get worried about anyone that had the power to defeat him.

"I had to marry James so that everyone would think that I had left Severus behind. We continued to meet in secret but I made sure that I didn't get pregnant again. I had to fake being pregnant, and the gods were very helpful in that area, and then I went to get you so that it would look as though I had you. I know the whole thing is complicated, but nothing about our lives is simple. Your, in reality, eighteen and not fifteen."

"Which means that you're a fully qualified wizard," I told him.

"You're a legacy of Hades and Ares, which means that you still have the power to defeat him. But you're going to have us with you."

"But he hates me," Harry told us.

"I had to pretend to hate you so that the Slytherin's wouldn't find out," I told him, "I don't hate you, I'm proud that your trying to be your own person."

"Sev, you're going to have to tell Madam Bones everything," Lily said, "That way we can stop this trial from happening."

"I agree," I said, "Madam Bones is the daughter of Athena and she's the only one, besides you, that knew that I was a demigod. I'll have her declare that Harry is a fully qualified wizard and that will cause the Ministry to leave him alone."

"Can she do that?" Tonks asked.

"Sure can, with a little bit of magic," Lily said, "Anyway, Severus has his real birth parchment and that's going to be good enough for her."

"I can't believe that Snape is my dad," Harry said.

"Harry, just because Severus had to act as though he hated you, doesn't mean that he liked it," Lily told him, "He's your dad and your blood is very special, more important than Draco Malfoy's bloodline. You come from a line of great hero's, and, trust me; Severus has been battling monsters for years."

"And that means, once we have you declared, that you won't have to worry about being sent letters trying to expel you," I said.

"I wonder why the Ministry wants to expel Harry so badly," Lily wondered.

"Because he spoke the truth," I told her. "And I have a bad feeling that Fudge wanted to use this to show everyone how politically important that he is. Well I better get going."

I looked at Harry and said, "You don't have to call me father, just yet. I know that you will always think of James as your father, and I have no problem with that, but I'll be around if you need me."

I kissed Lily on the cheek and then left.

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A/N: I hope that you all enjoy this story and I will update after seven reviews. Also, Harry will be learning more about his powers that he gets mainly from his father. I will be ignoring what Rick said that legacies possess none of their parent's skills.