Chapter 1:

…What?

Spider-Man and the Avengers are owned by Marvel and Disney.

"Talking"

"Thoughts/AI"

Line Break

Bzzzz…Bzzzz…Bzzzz

"It's your Aunt, would you like to answer?"

Peter Parker (just about finished with his lunch) nodded, "Sure, Karen".

Not a second later, he heard Aunt May through his in-suit phone. "Peter," she said, "Where are you?"

Peter peered over the edge of the building he was sitting on, "Uhhh…Rockefeller Center".

"…The building?" she asked, nervous edge in her tone.

Peter chuckled sheepishly, peering down onto the street below, "Yeah…"

A pregnant pause, "…All right…just, be home by three, don't wanna be late for movie night".

Peter pulled down his mask, "Of course. See you then May, love you".

"Love you too, Peter".

Peter disconnected the call, standing up and stretching his arms, "So, Karen, what's the forecast look like today".

"Mid-to-low sixties with a ten percent chance of rain, concentrated in Harlem".

Peter laughed, shooting out a webline onto a nearby building, leaping forward.

"Also, police are currently chasing a green Mazda connected with the robbery of a local jewelry store; current projections show that they will reach the corner of East 46th Street and Madison Avenue in two minutes".

Peter hummed, an odd sense of excitement surging through his body, as he slingshot forward.

Line Break

CRASH

"Jesus, Marko! The hell taught you how to drive?!"

Marko, a well-built man wearing a striped green shirt, scowled, narrowly avoiding another trashcan, "Tell you what Morris, next time, I start shooting up the place, and you can drive away from the cops!"

As if on cue; "Pull over, now!" a cop yelled over his megaphone.

Morris leaned out the window, "Fuck off!" he cried, shooting at the cruiser.

Marko made a sharp turn, jerking Morris to the side, and gun still firing. Marko flinched, before glaring at his partner, "The hell you trying to do?! Make this thing a convertible?!"

"Shut up and dr-!"

THUMP

Morris and Marko stared wide-eyed as Spider-Man landed on the hood of their car.

"Hey there. Now, I'm going to ask you to be good boys and—whoa!" Spider-Man dove to the side as Morris opened fire, destroying the windshield, a couple bullets ricocheting off the hood.

"Are you trying to wreck my car?!"

Spider-Man moved back in place, "You know, that's an excellent idea". He leapt in front of the vehicle, shooting two web lines, diving under the car.

Morris's face fell, "We aren't getting away, are we?"

Marko sighed as the car jolted, slowing down, "No…no we are not".

Line Break

Peter groaned in disgust as he wiped oil off his torso. "Not my best idea".

"Thanks for the help Spider-Boy," he heard an officer say.

With a twinge of annoyance, Peter turned to face the officer, "It's Man," he emphasized, "Spider-Man".

The officer smirked, tipping his hat, "Whatever you say, kid".

Peter absentmindedly waved goodbye, staring down at his stained suit, "Hey, Karen, any ideas how to get this out?"

"Fortunately, Mr. Stark has run into the same problem with his suits, and has developed multiple ways to-"

She was cut off as an explosion rang a couple blocks away.

Peter whipped his head toward the sound, only to fall back in shock as a portal opened in the sky.

Time seemed to slow down as he fell, heart pounding in his head. "Chitauri!, again! But Mr. Stark and the Avengers beat them all! Oh God, what do I do?!"

Thankfully, by the time he hit the ground, the portal closed. But that didn't mean everyone wasn't panicking.

Peter opened and closed his mouth multiple times, before finally finding his voice, "K-K-Karen, what was that?"

"Peter," She said in a calm tone, "Calm down. Though that was indeed a portal connecting our world and another, it was not the Chitauri, the energy output was for too different".

Peter's gulped (audibly, not that he noticed or cared) , before resuming. "Oh," he said in a small voice, "That's good".

"Tony and the Avengers have been informed, but your assistance is still required".

Peter got onto his feet, doing his best to ignore the panicked cries of the nearby populace, "W-what do you mean?"

"Several largee pieces of rubble fell through the portal before it closed, onto several buildings on the corner of 42nd street and Madison Avenue".

Peter nodded, leaping into the air and shooting out a webline. "Okay, okay, I can do this".

Line Break

"Man, I really don't want to do this".

Peter ignored the chuckle that came from his left, "How many times have I heard you say that?"

Peter groaned, "Put a sock in it Harry".

Harry Lyman grinned softly, leaning back against the park bench "C'mon, you've spent the last week prepping for this deal, you've got it in the bag".

Peter snorted, "I've also spent the last week taking care of a sick baby".

Harry sucked in a breath, "Right…but she's all better now, right?"

"Yes, thank god".

Harry nodded absentmindedly, "Well, regardless—!"

An explosion cut him off.

They both turned to see the upper floors of the Baxter Building (Parker Industries New York headquarters) become engulfed in strange, light-blue flames.

Both men frowned, "…Magic?" Harry asked.

"Most likely".

Harry moved his right sleeve, revealing a device one his wrist, on which he started typing multiple commands, "Demonic?"

"Possibly," Peter replied, inputting his own commands on his device.

"Mephisto?"

"Doubt it, wrong color".

Harry hummed, "Well, security protocols are operating smoothly".

Peter nodded, already running for the building, "See you in a bit!"

"Just be careful," Harry said as he called 911.

Peter, now in his Mk. 5 spider suit, swung high in the air, landing on the roof of the burning building, pleased to see a large group of people pooling together at the center.

"Everyone accounted for?" he asked one of the security personnel—Frank, he recalled.

Frank nodded, wiping some sweat from his brow, "All twenty-four evening staff members—janitors to admins—are right here".

Peter nodded, "Transport should be by in a few minutes. Any idea what started this".

Frank shrugged, but one of the scientists—Amy—spoke up, "I didn't see the cause, but I think the fire started down in the 30th floor".

Peter frowned, "That's where we're doing most of our teleportation experiments".

Amy nodded fervently, then (along with the rest of the non-helmeted people) ducked her head down as a VTOL came in and hovered overhead.

After ensuring everyone was secure, Peter ran downstairs. In other news, he knew this had nothing to do with Mephisto, it was far too quiet.

He kicked down the door to the 30th floor (wincing as he did so, another expense to take out of his paycheck).

He looked around, trying to gauge where the problem was. He closed his eyes, letting his spider sense guide him.

"…WORK YOU DAMN MACHINE!"

Peter smiled, that worked too.

As he followed the increasingly colorful stream of curses, he found himself in front of another door (which he would not have to kick down, thankfully) that lead to where they were testing their extra-dimensional equipment. The door slid open, and he tilted his head at what he saw. "…Mysterio?"

Mysterio (a.k.a. Quentin Beck) looked over from the computer screen in shock (Peter assumed, that fishbowl over his head hid all emotion). "Wha—Spider-Man?! How did you get here so fast?!"

"I used the stairs".

Mysterio spluttered, "But you should have been accosted by my illusions".

Peter pointed to his mask, "Air filter".

Mysterio and Peter stared at each other, silently, before the former slumped his shoulders, "Of course". He then tried to turn back to the screen, only to get webbed to the wall.

Peter sauntered over, "So…why didn't you tell me you got out of the hospital? Would've personally delivered you to prison".

Mysterio was silent, glowering at Peter (again, he assumed).

"So…what's with the blue fire?"

More silence.

"Did you make a deal with the devil? Cause take it from me, it ain't worth it". He started typing on the screen, "Sure, it sounds like a good idea on paper," he peered at the screen, "But next thing you know, you're living in a basement and dating one of the strangest women you've ever met—what the hell did you do?"

Mysterio snarled, "If you must know, I was hoping to find some other reality to live in. One without you!"

Peter paused, looking over his shoulder, "You already tried that, and failed".

Mysterio (assumedly) scrunched up his face, "No I haven't".

"Yes, you have".

"No".

"Yes".

"No!"

"Ye—Oh wait, you don't remember the multiverse collapsing, do you?"

"…What?"

"Oh," Peter leaned on the computer, crossing his arms, "It was a pretty involved event, a lot of things led up to it, some of it really ins—"

"WARNING!" Peter whirled to around, "DIMENSIONAL COLLAPSE IMMENENT!"

Peter shook his head, "Oh no. No no no no no, I fixed you!"

"Evidently not!" Mysterio cackled.

Peter ignored the criminal, typing away. He sucked in a breath, when, after doing some mental calculations, realized he wouldn't be able to completely stop the collapse. He let out a breath, "At least I've got that communicator to Loom World".

And his world was engulfed in a bright white light.

Line Break

Peter dropped to the ground, carefully letting down the woman who was holding onto him for dear life.

"Oh, thank you!" she exclaimed, pressing her lips against her his masked cheek, "Thank you so much!"

Peter straightened up slightly, "This job does have its perks".

"Marcus!" he turned to see an older man frantically move through the crowd, "Anybody see Marcus! Marcus!"

"Hey," Peter ran to meet the man, "What's wrong?"

"It's my son," the man said, eyes wide with fear, "Marcus. We were in that building," he pointed at one of the collapsed buildings with a shaking hand, "But then that stuff fell on it, and we got seperated and-and-and-" he doubled-over, hyperventilating.

Peter moved closer, placing a hand on the man's shoulder, "Listen," he said in a calm (he hoped) tone, "I'll find you son, all right".

The man nodded, looking at Peter in mix of awe and gratitude, "Please, hurry!"

Peter nodded, jumping back into the building. "Karen," he began, "are your sensors still down?"

"Unfortunately," the AI responded in an aggravated tone, "Whatever energy the portal used is still interfering with my telemetry".

"Guess we're doing this the hard way," Peter muttered, "Turn on the speakers".

"Hello," his augmented voice called out, "Marcus! Marcus, are you there?!"

He hopped up another floor, "Marcus!"

"Hello," a pained voice called out, "Anyone there!?"

Peter whirled around, easily spotting a young man half-buried under some concrete—which, Peter noted, looked different from the rest of the building.

Peter moved forward, "Hey, Marcus, right?"

The man nodded.

"I met your dad outside," he said as he moved some of the rubble.

Marcus sighed in relief, "Dad made it out? Thank god".

Peter shove away the last bit of rubble, wincing at the sight of Marcus's bloody leg. "How's it feel?"

Marcus looked down at the limb, "Holy crap!"

CREAK

Both Marcus and Peter froze. They both looked up, paling at the sight of a large machine, barely hanging from the ceiling on a bunch of black wires.

Peter tensed, flexing his fingers.

SNAP

Marcus covered his face, with his hands, crying out, as Peter brought his hands up, bracing to catch it, eyes (and lenses) squinting as he braced for impact.

Only…it didn't come.

Peter opened his eyes, confused. He gazed upwards, noting that the machine was hovering just a few feet above his head.

"Woah…" he heard Marcus exclaim.

"Hey," he heard a voice gasp out, "Not that this isn't a great workout, but you think you could take the injured man to a paramedic?"

Peter whirled around, only for his eyes to widen in shock.

"…Oh my," he heard Karen whisper.

Peter stared on in shock as, right in front of him, was another Spider-Man.

A/N: So…saw Homecoming, thought this up. Hope it's good. Oh, and both universes are a little AU, just thought I'd get that out of the way. Be sure to leave a review. Later.