Diverging Timelines

Rating: K+

Summary:Percy Jackson and Peter Parker are both residents of New York. When Peter goes on patrol in Manhattan during the battle, their lives begin to overlap. Superheroes and demigods both reside in the city, and it's only a matter of time until the two boys finally meet. They have more in common than they thought, and once they learn about each other, become fast friends. (Spider-Man HOCO, PJO, Avengers crossover)

Peter smiled as he swung from building to building. It was still a new development, as he had gotten his powers only a few months ago.

He usually stayed around home, but today he felt like exploring more. He was making his way towards Manhattan, keeping his eye out for any small crimes he could stop. As he approached the city, however, he began to feel tired. He blinked, trying to shake the feeling off as he continued, pausing when he noticed everyone in the city was asleep. Cars were stalled, and there were people curled up on the ground.

He only had enough time to wonder what was going on, before he collapsed on the top of the building he had been standing on, falling asleep.

Percy held on tightly as he was being flown across the city, the flying pig squealing as it flew. He frowned as he noticed a figure dressed in blue and red, something about it seeming familiar, but had no time to think about it as they approached the statues he needed to activate.

He smiled triumphantly as the statues came to life, attacking the flying pig, and he dropped, Blackjack catching him.

It was a small victory in the scheme of things, as the battle was still ongoing. Percy sighed, heart heavy as he directed the pegasus to where he wanted to be dropped off.

It was going to be a long day.

Peter groaned as he woke up, the city coming to life as well. Confused voices hit his ears, and he was able to pick out certain conversations.

"What happened?"

"What the-?"

"Did I just lose a few days of my life?"

Peter glanced down, taking in the chaos. There were statues in headlocks, and in places they shouldn't be. As well, a helicopter was parked in front of a building, the pilot looking confused. Peter stared at it, taking in the logo on the side. Dare Enterprises.

He had heard about the company. It was well-known, and there were a few buildings near his home that had been constructed by the company.

What was that doing here? He wondered. Peter made his way down the side of the building, sneaking through alleyways until he could get close enough to the helicopter to hear the pilot calling someone.

"Where's my daughter, Jones?" The voice came from the other end of the line, and Peter was glad at that moment that he had super hearing.

"I- I dunno," the man, now identified as Jones, replied, hanging his head in shame.

"What happened?" the voice was angry, cold.

"One minute I was flying. I heard Ms. Dare scream, then everything went dark. I just woke up, a day later, somehow on the ground. But she was gone."

"You better find her." That was the last thing the voice said before the call ended. The pilot looked terrified.

"Gotta find her, gotta find her," he muttered to himself.

Peter tilted his head. Did he have time to see if he could help finding the missing girl? He checked his watch, deciding that he could spare a couple hours before he had to head back home. May had been away for a few days, believing he would be at Ned's, playing with legos and video games since school hadn't started back up yet. She wouldn't be super concerned that he didn't check in yesterday.

And wow. How did he miss a day of his life? How long had traffic been stalled before he arrived?

He didn't know where to start, however. He wished he could access the cameras he knew were there, but didn't have any access to a computer. Peter knew they were fairly restricted, but he was well versed in computers, so it wouldn't take him too long.

Looking around, he spotted a library. He hesitated; he was still in his suit and didn't have anything to change into, but he pushed his worries aside. There was a girl missing. He had to help.

Sighing, he made his way down the building, ducking into the library. He was relieved when hardly anyone looked at him, too concerned about what had happened.

Peter quickly logged into the computer, his library card number luckily memorized, fingers typing furiously. He would be lying if he said he hadn't hacked the cameras before. They were helpful when he was trying to track a criminal. This time, however, it was different. Mumbling under his breath, Peter searched for a picture of the girl he was looking for.

Rachel Elizabeth Dare. She was about two years older than him. Her green eyes seemed to stare into his soul through the monitor, like she could see things he could only dream of. Her red hair was pulled onto the top of her head, a few curls escaping. Her face was covered in freckles, and the shirt she was wearing was covered in paint.

"Okay," Peter murmured. Now that he knew who he was looking for, he started checking the camera feeds. It took about ten minutes until he spotted her.

She was arguing with a boy who looked like he was Peter's age. The boy had an angry glare and scowl on his face, hands gesturing wildly. Rachel just looked at him calmly, her eyes dreamy. Then she clambered up on- was that a pegasus? - and took off.

Peter shook his head, blinking, before looking back at the screen. There was no way… But there it was, on the screen. A black, winged horse.

Peter knew that Norse mythology was semi-real, just not in the way stories said. After all, Thor, the Thor, was real. But how could Greek mythology be real, too?

Maybe I just hit my head too hard, Peter thought to himself. He shook of the thought, before using the cameras to follow her path. He grinned, satisfied with his work, until she left the city, and there were no more cameras to follow.

Scowling to himself, Peter moved to close out of the camera feed. He would have to try and track the girl himself.

Then something caught his eye. There was a group of kids in matching shirts standing outside the Empire State building, swords in hand. They looked exhausted, and some were crying. And the Empire State building was… blue?

Shaking it off, Peter closed out of the feed, before speeding out of the library. He shot a web up to the top of the building, and swung off in the direction Rachel Dare had gone.

He grinned at the feeling in his stomach as he soared through the air. Once there were no more buildings he could use, he sighed, dropping to the ground. He followed the road, coming to a hill. He climbed it, watching his footing. Peter's face paled when he reached the top, where a single pine tree stood. And there, wrapped around the base of the tree, was a dragon.

"Okay, that's it," Peter mumbled. "I need sleep." He turned to leave, a flash of red and the sound of voices causing him to stop.

He saw the girl he was looking for walk into a house that lay in the valley.

Peter's spider-sense went off, warning him not to get closer. Instead, he pulled his phone out, snapped a zoomed in picture of Rachel, before leaving. As he sat on the roof of a bus heading back to the city, he hacked into Dare Enterprises, finding Mr. Dare's email. Sending the photo anonymously, he left a two sentence message.

I helped look for your daughter, and she is alive and safe. She'll return soon.

He worded it carefully, not wanting it to seem like Rachel had been kidnapped. Satisfied, Peter hopped off the bus, and made his way back home, swinging through the city.

He gripped my sleeve, and I could feel the heat of his skin like a fire. "Ethan. Me. All the unclaimed. Don't let it . . . Don't let it happen again."

His eyes were angry, but pleading too.

"I won't," I said. "I promise."

Luke nodded, and his hand went slack.

The gods arrived a few minutes later in their full war regalia, thundering into the throne room and expecting a battle.

What they found were Annabeth, Grover, and me standing over the body of a broken half-blood, in the dim warm light of the hearth.

"Percy," my father called, awe in his voice. "What . . . what is this?"

I turned and faced the Olympians.

"We need a shroud," I announced, my voice cracking. 'A shroud for the son of Hermes.'"

Percy was right: it had been a long day, and the next day had been even longer.

But the battle was over, and they had won, though many had died in the process. It made his heart ache and stomach churn, but he was relieved that Annabeth was still there at his side, along with Thalia and Grover.

Their time on Olympus flew by, only coming to a screeching halt when Zeus offered him immortality. He knew he did the right thing turning it down. He owed it to Luke, to Ethan, and all the unclaimed demigods who felt ignored. He made a promise, and he was going to keep it.

It had been the longest day of Percy's life. It had been a day of burning burial shrouds and paying respects to those who had died fighting for Olympus. It was a birthday the son of Poseidon would never forget. The sight of Luke's broken body would forever be burned into his memory. After all that Luke sacrificed for them, Percy knew he had to keep his promise to the son of Hermes.

Those were the last words he heard, the son of the sea thought to himself. The last words Luke Castellan heard were "I promise."

Percy set his thoughts aside when Annabeth approached him, cake in hand. He looked at her, taking in her blonde curls and gray eyes.

And all was right as he created a bubble around them, pulling her closer.

It was pretty much the best underwater kiss of all time.

A/N: After realizing that it was likely my two favorites lives could overlap, I decided I had to write about it. I created my own timeline for the events that happen, including the Battle of Manhattan, Home-Coming, the Second Great Prophecy and Infinity War. I took liberties on a few things, so Peter's side of the story is not necessarily canon though I tried to keep it as close as I could. They boys will meet before hand, figure out something is up with the other, but won't become friends until after the events listed above are completed.

I hope you were intrigued by this chapter. It's just to set things in motion. The rest of the story, as well as some sequels are already written.

Cross-posted on AO3 (hopecanbeyoursword)

Thanks for reading!

~NewtsSuitcase