Disclaimer: I don't own Harry Potter or Percy Jackson. And happy first day of spring!

This was edited by Mellie Erdmann.

Yeah… go check out "Harry Potter and the Lightning Thief" (or "Percy Jackson and the Sorcerer's Stone") before reading this. Go, really.

No? Well, at least read the blurb for "Harry Potter and the Lightning Thief"-

Harry Potter woke up on an American bus and accidentally-on-purpose killed a teacher without a clue about what he had gotten himself into. And that's the least of his troubles. It turns out mythological monsters and the Greek gods are real in this world and they're already angry at him. Zeus' master lightning bolt has been stolen, and the guy whose body Harry is in is the prime suspect.

Now Harry and his new demigod friends have only ten days to find and return Zeus' stolen property and bring peace to a warring Mount Olympus. But to succeed on this quest, Harry will have to do more than find the real thief: he must come to terms with this new world; solve the Oracle's baffling prophecy, which warns of a friend's betrayal; and unravel a conspiracy that could bring down the very gods.

Chapter One: My Best Friend Shops for a Wedding Dress

Harry Potter thought he had gotten used to weird dreams. Then he learned about a whole new category of 'strange' thanks to a dream he had one early June while on a solo quest.

He was sitting in a little shop, sipping a strange warm liquid. The label called it 'butterbeer'. Glancing at his reflection in the shop's window, he saw it had changed- again. At least this time it was someone he recognized.

He was one of the four people the Oracle had shown him during the first prophecy he had received from her, throwing him into a quest to keep this world from ending. Oddly, he wasn't the one who had looked almost exactly like his true self, but the one Hades had reminded him of- pale skin, shoulder length black hair, grey eyes, and charismatically handsome. Weirdly, he was wearing a crimson robe over jeans and a black sweater.

Harry was worried he wasn't panicked about the fact that he was not in charge of this body, but was rather shunted off to one side to observe only.

"Hey," went an oddly familiar voice. The guy who looked like an older version of the real Harry but with hazel eyes exited the back room, carting a giant poufy white dress. He too was wearing a robe- a mossy green one over brown slacks and a grey T-shirt. "Do you think she'll like this one?"

"Too poufy," went a third voice. Harry found himself looking over to its source, which turned out to be the third male of the quartet the Oracle had shown him- the one with brown hair and gold-brown eyes. Now he looked younger, with no grey hairs. "Lily would hex you to oblivion."

"She would, wouldn't she?" sighed the one who looked like Harry. "Padfoot, what do you think?"

"I'd get it just to see the look on her face," joked Padfoot.

"Hah-ha," the messy-haired man made a face at Padfoot as he tossed the gown onto a chair. "Okay, I'll go find another one."

And he went back into the other room to find another dress. After taking a long chug of butterbeer Padfoot asked the brown-haired man, "You sure you're fine with me being Prongs' best man, Moony?"

"Yeah, Padfoot," Moony replied with a smile. "You two are best best friends."

"Wish Wormtail was here; his mom's health has been declining lately," Padfoot noted. "Oh well, he'll be sure to show up at the wedding…"

"Of course; thank goodness it's on a new moon," mumbled Moony, tugging at one of the sleeves of his tan turtleneck sweater.

"Yeah," acknowledged Padfoot just as Prongs returned with a bright pink strapless gown with white silk roses embroidered on it.

"Well?"

"Eh…" went both awkwardly.

Defensively Prongs said, "Lily can wear pink!"

"Not that shade- besides, white is more traditional," pointed out Moony. Sulkily Prongs put down the gown and retreated. Moony asked Padfoot, "Where is Lily, anyway? At the florist's again?"

"Nope- she's off picking out bridesmaid dresses. Tomorrow she and Prongs will go pick out the cake, yum…"

"Do you think it'll be chocolate?"

Padfoot laughed. "No idea. I bet your wedding cake will be all chocolate, huh, Moony?"

"I'm not going to get married, Padfoot, I'm not," Moony blushed. Plaintively he added, "Who'd want to marry me anyway?"

"A better question is who'd want to marry me," snorted Padfoot, eyeing his bottle of butterbeer. "James lucked out with Lily, didn't he?"

In the pause that followed Harry realized that Prongs, Moony, Padfoot, and Wormtail were nicknames- and that if the man who looked like him was a relative, then he finally had a clue about his family besides his Aunt Petunia, Uncle Vernon, and cousin Dudley.

"Yes," agreed Moony softly. "Good thing he knows it, too."

Before Padfoot could reply, Prongs-cum-James swept in carrying a white long-sleeved gown with off-shoulder sleeves and silver runes embroidered onto the flowing skirt and fitted bodice. He looked rather pleased with himself. "What about this one?"

As Moony and Padfoot admitted it was a very nice gown, Harry felt himself slipping away…

HPJHPJHPJ

He woke up to an owl hooting its farewell as the sun peeked over the horizon. With a yawn, he rolled out of his bedroll. As he noticed a silver thread touched with red lying across his left hand, it melted into his hand.

"That can't be good," Harry spoke out loud. He studied his hand for a minute but when he couldn't find anything wrong he just packed up his bedroll and got ready to continue his quest. On the first of May he had finally worn down Chiron enough to ask the Oracle about where he could find a weapon that would suit him. Riptide, or Anaklusmos in the ancient Greek, was close but since Harry was not a true son of Poseidon it didn't feel right.

Harry was in the body of a forbidden child- a son of a mortal woman and one of the Big Three, in this case Poseidon, named Perseus Jackson. Originally it had been feared that Perseus had stolen the master bolt the December before last, but he had been proven innocent when Harry; Clarisse LeRue, daughter of Ares; and Annabeth Chase, daughter of Athena had gone on a quest to find it.

At the end of the day, though, Harry was caught between too many paths and ways of being. That was part of why Riptide nor any other celestial bronze weapon he had tried would not work for him.

Harry still wondered sometimes how Percy was coping in Harry's original world. He would have started secondary school by now at Stonewall High. But Harry pushed thoughts of Percy to the back of his mind as he chowed down on one of his remaining granola bars while trekking through the dense, ancient forest he had been struggling through for the past fortnight.

The Oracle had given him a prophecy about how and where to find a weapon that would fit him:

Go to far Scotland without aid,

Plumb the lake where the swords have laid.

Be sure to pick the right sword,

Or the lake will have the last word.

Thankfully Percy's watery powers were guiding him to the correct lake, and Harry was sure the lake of the prophecy was just beyond these woods. He made his way around a spider web, remembering how spiders had lived in his cupboard at Privet Drive.

He thought more about his dream as he hiked on. Clearly someone or something had wanted him to see that memory- but why? Was James-cum-Prongs his father? Did that make the Lily they were shopping for his mother? And what had happened to Moony, Wormtail, and Padfoot if they been that close to his parents? Why had they never come to meet Harry? Had the Dursleys forbade it? That sounded like something they would do.

The sun was past its zenith when the trees finally started to shrink and the gaps between them grew. Eagerly Harry picked up speed- he found himself excited to see what was on the other side of the forest, like he'd been waiting for this all his life. Which was absurd, as this wasn't even his Great Britain.

Giving up, he started to run as the sunlight brightened and he could all but see the glinting waters of the dark lake. Then he drew up short at the forest's edge just to take in the view.

The empty space was full of knee-height blooming heather nearly right up the lakeshore. On the lake's other side was a flat-topped mountain that seemed lonely somehow. But Harry refocused on the nearly black waters of the lake. The buzzing in his veins told him that this was the lake he needed to explore. Heading down to its edge, he stripped off his backpack and dirty orange camp shirt but left on his leather camp necklace. Next he kicked off his sneakers and tugged off his socks.

Harry, despite knowing he could breathe underwater now, took a deep breath. Then the preteen swam out into the frigid lake before diving in to find a sword for himself.