Disclaimer: I do not own Percy Jackson or Harry Potter (unfortunately) they each belong to their respected owners.

I did not wright this amazing piece of work I'm just adding my own twist to it and maybe expanding in it. The original writer is I'mjusttryingtofindmyway, any way enjoy.

August 31st

"Remind me why we're here" Percy looked at Hecate as they walked down Diagon Alley. "Sigh, we're here to open up a vault for you" she sighed, "Yes, I know that, but why? You just pay for everything; I don't feel bad because for you money is nothing for an immortal goddess"

The goddess of magic looked at him "Sigh, what happens when you finish school in the normal world?" she asked. "You get a job?" Percy replied, "Yes, so when you get a job you earn money, and that money is put into a vault, what do you think you will do with the money you earn? Just leave it lying around the house. I think not. I will not have my student leaving money lying around like a Leprechaun." She firmly stated. "So this 'wizard bank' is run by Goblins?" he asked, "Yes, Gringotts is the only wizarding bank in the world, it was founded by a goblin by the name of Gringott, in 1474, really paranoid chap, so paranoid in fact that the amount of charms, enchantments, curses and runes, it would take you 50 years to reapply them even if you are casting a spell every second." She said. "So...it's safe? Right?" Percy said, Hecate stopped and raised an eyebrow at him. "A child of Hermes wouldn't be able to break in even if they were invisible, so yes, it is safe." Percy blushed and starched his neck "sorry" he said embarrassedly. "It's okay I didn't expect you to know anyway" she smiled "HEY!"

They finally had reached a snow-white building which towered above the other little shops. Standing beside its burnished bronze doors wearing a uniform of scarlet and gold was—

"That's a goblin" said Hecate quietly as they walked up the white stone steps towards him. Percy stopped and bowed towards the goblin, surprized the goblin was monetarily still then did a ninety decree bow then stood up, smiled and said "May the fortune of prosperity for ever be in your favour" as they walked in. Now they were facing a second pair of doors, silver this time, with words engraved upon them:

Enter, stranger, but take heed

Of what awaits the sin of greed,

For those who take, but do not earn,

Must pay most dearly in their turn,

So, if you seek beneath our floors

A treasure that was never yours,

Thief you have been warned, beware

Of finding more than treasure there.

"Talk about ominous warming" Percy grumbled.

A pair of goblins bowed, and Percy bowed back as they passed through the silver doors, into a vast marble hall. About a hundred goblins were sitting at a two long counters on either side of the hall.

As they reached the front desk at the end of the hall. "I would like to open a vault for my ward" she said looking at the goblin scraping names into a book (Arthor's note: I'll call this goblin, goblin one). Goblin One looked up indifferently "Name?" he asked "Percy Jackson" she replied. Goblin One quickly looked at Percy then back at Hecate "you're his mother?" he questioned "no his aunt" she stated. "Alright, please fill this in" and handed Hecate a form to fill in.

GRINGOTTS' VAULT APPLICTION FORM

DATE: 31ST August 1994

FIRST NAME: PERSEUS

LAST NAME: JACKSON

MIDDLE NAME: ACHILLES

DATE OF BIRTH: 18th AUGUST 1977 (His false birth certificate)

WAND: ENGLISH OAK, 15 INCHES, PHOENIX FEATHER CORE

AGE: 17

ADDRESS: NUMBER 7 PRIVET DRIVE, LITTLE WHINGING, SURREY

Hecate handed back the form to Goblin One, Goblin One took form read it then rolled it up and placed it in a tube. Goblin One opened a draw and pulled out a double-sided knife, the knife completely silver with a red ruby on the hilt and runes that ran along the spine, that Percy recognised as cleanse, preserve, and a few other for disinfected. "Lastly blood for the ancestry history" Percy took the blade and brought it up to his gums and cut and placed it back on the stand.

The blade was placed in the tube with the form, Goblin One then dropped the tube into a pipe that stuck out of the desk. A few minutes later Goblin Two came running up to Goblin One with a key and scroll and whispered something to him. Goblin One looked at Percy then back to Goblin Two and whispered something back and took the scroll and key. Goblin One turned back to Percy "Well there seems to be some complications" he said. "What complications?" Hecate asked "It seems that Mr. Jackson here is actually Mr. Black. (DUN DUN DUN! Didn't expect that did ya now)

Time skip sponsored by Kronos

Now riding the cart through the caves "HOW AM I RELATED TO A PUREBLOOD FAMILY" Percy shouted over the wind blasting at them from how fast they were traveling "PROBABLY YOUR MOTHER WAS A LONG LOST DECENTENT" she yelled back, not casting a barrier to protect them from the cold, sharp wind, to keep up her squib façade. "BUT SHE DIDN'T USE ANY MAGIC OR HAVE A WAND" Percy yelled back, "SHE WAS PROBABLY A SQUIB" she yelled back and left Percy to wonder about the secrets of his mother.

A few minutes later the cart now at least 500 miles deep slowed down as it came into was can only be described as a natural train platform. The goblin walk up large door the size of a hellhound. "Key please" Percy handed the goblin the key, the key was inserted and turned, the sounds of cogs turning, metal bars being lifted and shifted came from the door "please place your hand at the top, then bring it down the middle" the goblin stated. Percy swiped his hand down the door, the cogs stopped turning and the bars stopped, and the doors swung open, and Percy gasped at the amount of Galleons.

September 1st

Percy stood in King's cross station with his trunk all packed and shrunk inside his pocket. He wore muggle set of clothes, complete with a black hoodie and carried Hoothoot cage under his arm. Kelly the mini veela was sleepy so Percy tucked her into his hoodie which she used as a tiny hammock to sleep in.

"Now did you remember to take everything?" Hecate asked, "wand? Sword? Watch? Cauldron?"

"Yes, yes, yes and yes," Percy grinned, "relax Hecate, I'll be fine."

"Well, you can't blame me for worrying, can you? Honestly it was like it was just yesterday when you came to me completely lost about the magical world, and now look at you. About to start Hogwarts," Hecate smiled as slowly tears fell out as she cried.

"Oh, come on, don't cry," Percy wrapped his arms around the goddess drawing her close, "I'll be fine Hecate, after all you were the one who trained me right?"

"If anything happens you call me, okay?"

"I promise, if anything happens, I will get you right away."

"Good. Now go on," Hecate broke the hug wiping her tears, "make sure you have plenty of adventures Percy, and if anyone gives you trouble don't be afraid to prank their asses to Hades!"

Percy grinned back, "you got it aunty!" He waved to her one last time before the goddess suddenly disappeared into thin air. Percy smirked, 'show off.'

He walked to the barrier between platform 9 and 10, just like Harry told him, and waited for a few moments. Eventually a family dressed in strange clothes passed by. Obviously, they were wizards who didn't have the first clue about looking muggle. They had their little girl with them pushing her trunk forward. They ran into the platform and in front of Percy's eyes vanished through.

Percy sighed, 'alright, I'll just do what they did.' He walked up to the pillar and took a calming breath. He then ran forward into the pillar and the moment he expected to feel the hard breaking solid slap of the stone pillar Percy found himself stepping through the barrier.

"Woah!" Percy said as he looked at the platform before him now. In the station was a crimson red train engine with the words 'Hogwarts Express' written on a plaque. There was smoke coming out in spades covering the entire platform that was filled with parents saying goodbye to their kids.

Percy walked past them all towards the end of the train. He ignored all the crying and emotional moments by focusing on his excitement to finally see Hogwarts. He put Hoothoot in the storage compartment, he knew the owl would be automatically taken to his room in Hogwarts. Percy then climbed into the last compartment and looked around finding none of them empty.

Percy grumbled under his breath, 'well might as well make some friends.' Each compartment was filled with different types of people. The first one had kids around Harry's age, the second with a few rough and tough looking guys and the last was filled with older girls.

'Okay, so the one with guys is out, they look like bad news with only 20 IQ points between them all. The one with girls look promising, and since I managed to hold my own with a group of veela cheerleaders I should be good now as well. But so far, the most logical choice seems to be the younger kids. Well….fuck it, compartment of girls it is.'

Percy knocked on the compartment door and slide it open, "ah, can I sit here? Everywhere else is full."

The girls looked at up him and smiled. "Sure," a girl with blonde hair with brown streaks running through it and dark eyes.

"Thanks," Percy smiled as he sat down, "I'm Percy by the way, Percy Jackson."

"Katie Bell," the blonde-haired girl said.

"Angelina Johnson," the girl had light black skin and black hair. She had a very pretty face and smiled with her eyes.

"Alicia Spinnet," said the last one. She also had light black skin and black hair. Her eyes however were bright blue putting her aside from Angelina in a very different way.

"Where are you from Percy?" Katie asked.

"Can you tell Kate? He's from the states," Alicia said with a smile.

Percy nodded, "she's right, I'm from US, I just transferred into Hogwarts recently."

"You transferred here? Which year?" Angelina asked.

"I'm a sixth year."

"Wicked! So are we!"

"Well expect Katie," Alicia explained, "she's a year younger."

Percy smiled, "cool! Guess I lucked out meeting you guys huh? What house are you in?"

"We are all in Gryffindor," Kate Is said, "and we are all on the quidditch team."

Percy blinked, "you are? Oh, wait I know you! You are….you three play chaser, don't you?"

Angelina gasped, "yes, how did you know that?"

"Oh, my neighbour told me. He's from Hogwarts too, actually he's your teammate too if I recall correctly. He plays seeker."

"You mean Harry?" Katie asked, "you're Harry's neighbour? Seriously?"

Percy nodded, "yeah, I just kind of ran into him before and we started to hang out. He told me all about Hogwarts and such."

"I see..." Alicia hummed, "so Percy what house are you in?"

"Well, I don't know. I haven't really been sorted yet," Percy shrugged, "but I'm thinking ether Gryffindor or Hufflepuff."

"Wait, seriously? You want to be a Hufflepuff?" Katis asked astonished.

"Yeah, a house of loyal people that work hard and won't betray your trust? Come on! That's got to be the best house to join!"

"Actually, most don't see it that way," Angelina shrugged, "for them it's more like this place that all those who aren't smart, cunning and brave go. It's like the dumping ground of Hogwarts."

Percy shrugged, "I don't really care. As long as they are good people does it matter?"

Alicia grinned, "spoken like a true Puff!"

"So, you guys heard about what happened at the quidditch world finals?" Angelina asked.

"Yeah, my parents and I left after the match, but it seems Fred and George's family stayed and saw the thing first hand!"

"Wait you guys know the Weasley twins?" Percy perked up.

"Yeah," Katie nodded, "they are the beaters in the Gryffindor team."

"Huh...I see...tell me do they visit you guys during the trip to Hogwarts?" Percy asked.

"Yes, why?" Angelina narrowed her eyes.

Percy grinned, "perfect."

And hour passed and the train slowly pulled out of the stations. The Weasley's made it just in the nick of time and managed to board the train seconds before it left. George and Fred said goodbye to their parents and told their younger siblings and their friends they would see them later.

They made their way through the train searching for their friends and greeting them. Eventually they reached the last compartment and smiled as they saw their three female teammates inside.

George threw open the door, "hello ladies!"

Splash!

George and Fred blinked as they found themselves once again drenched in water. They looked around and then at each other sighing.

"Come out Percy, we know it's you," Fred grumbled as he dried himself and his brother off.

"Oh, you guys found out, that's not fun," Percy stepped from behind the door and grinned, "looks like I'm going to have to change things up."

"The moment we step onto Hogwarts's sacred grounds you are going down Jackson," George growled.

"Sure, that's going to happen," Percy sat down next to Katie.

"We are going to make you regret ever messing with us Jackie," Fred teased as he moved next to Alicia.

George moved and sat down next to Angelina, "-and you better watch your step because we will get you when you least-"

Pfft!

George and Fred blinked; the moment they sat down two farts let loose. They looked at each other and blinked. They got up and found two whoopee cushions in their seats.

"It's a muggle gag joke," Percy smirked, "figured you two wouldn't recognize it."

The twins looked at each other and then at Percy. "You do realize-"

"-That this means war?"

Percy smirked, "I have all year tweedled dee and tweedled dumb. Bring it."

Arthor note: I thought that the original author left out Gringotts and the potential it held, and You didn't expect Percy to be related to the Blacks, so see ya later.