Hey ppl, sorry bout the late chapter. I read the entire mortal instruments series this weekJ. Maybe ill do a fanfic for that too, so amazing! Anyway, review after read plz! BTW I might change this chapter, it was kinda done on late notice.

Percy POV

Percy woke up on the floor. Groaning, he rolled over and pushed himself up. He staggered out the door to the main floor, rubbing his eyes.

"Hey Arielle, sleep well?" Leo's usual morning words greeted him. Percy sniffed.

"Is that waffles?" he asked, "And coffee?"

"Nope, its pancakes and black decaf coffee. Your food senses are dulling mi amigo!" Percy rolled his eyes.

Steve was at the stove, obviously cooking. Tony and Leo sat at the counter. Natasha and Clint were standing off to the side, their eyes scanning the room.

"Why are you up so early," Percy yawned.

"Because they never slept," muttered Steve.

"Sleeping is overrated," said Leo airily. "Besides, I can't sleep once you give me a dose of caffeine." He tapped on his coffee mug impatiently.

"Um Perseus –"

"Percy," Percy corrected, "Didn't I tell you before?"

Steve coughed. "I wanted to apologize, for how I upset you last night. I didn't know it was a sensitive topic until your friends told me." Percy shook his head.

"No, you didn't upset me. It totally wasn't your fault. I just didn't feel so good," Percy said. He forced a grin. Leo shifted.

"Still," said Steve uncertainly. His eyes flitted over to Leo, who shook his head slightly. He fell silent.

"Where are your friends?" Natasha spoke up.

"Um, Reyna's in the training room. Frank, Hazel, and Piper are still sleeping. Jason is on the roof. And Nico's somewhere . . ." Leo trailed off.

"Well, if they want food, they better come up," said Steve. He dished up platters of food and placed them on the table.

Leo grabbed one and stuffed it in his mouth. "See ya," he mumbled.

"You're done?" asked Clint incredulously.

"I don't need to eat a lot," said Leo. "I told ya, I live on Fonzies." He laughed.

"Explains the scrawniness," muttered Clint.

"Leo! You need to eat more than that," a voice commanded. Percy turned to see the rest of his friends up. Most of them had bleary eyes. They shuffled forward, reaching for the caffeine.

"You guys look like zombies," commented Clint.

"Leo eat," ordered Piper. "You can't starve yourself." Leo snatched up two pancakes and dashed out of the room.

"So, what do we do today?" asked Percy.

"Well, if we have no mission, we stay here. Steve beats the crud out of punching bags or fights with Natasha. Tony holes up in his workshop or works in the lab with Bruce. And I train," said Clint.

"But what do we do?" asked Percy.

"Er," Clint shrugged. "All Fury said is you can't go around sniping people. Or robbing banks."

"Joy," said Percy dryly. He turned to Jason. "You wanna spar?"

"Sorry man, gotta fly over to Seattle to check something," said Jason apologetically.

"Reyna?"

"Yeah sure, get ready to lose," she drawled.

"Whatever."

"Oh yeah, Mr. Stark, I was wondering if we can have an extra floor," she said, turning to Tony. "For extra things."

"Sure," said Tony, giving her a weird look. "But call me Tony, not Mr. Stark. I am not that old!"

Reyna nodded. "Ok, I won't try to respect my elders."

"I'm only some years older than you. Hey, how old are you anyway? All of you look around 13 or 14."

"Physically, we are fourteen by appearance," she replied curtly. She jogged off to the elevator.

"Physically? Wait a minute – that means you – wait – does, hey where you going?" He threw his hands up in frustration.

Percy watched as his friends went in separate directions. Tony gave him a hopeful look.

"I'll be in the gym," Percy said, quickly leaving.

Steve POV

"JARVIS, I want all the information you can find on those kids. Hack into SHIELD if you have to. Put all documents in a file." Tony nodded. Natasha frowned.

"What shall I label the file as, sir?"

"Hmm, just leave it as an unnamed file for now," Tony grinned.

"Um, Tony, isn't that an invasion of privacy?" said Steve.

"Pshh, it's obvious they'll never tell us their past. So I'm doing it the hard way. Now, I just have to figure out how to trick them into a physical and blood test."

"Tony, they won't share because we're outsiders," said Bruce, "It's obvious they only keep things between the eight of them. And it is very clear they don't trust us. Invading their past isn't exactly a correct thing to do right now."

"But I let them my tower! And they made a deal with Fury. That's pretty trustworthy." said Tony.

"Tony, we kidnapped one of them." Bruce sighed.

"And the deal was more of an alliance. They are on our side, but they don't have to like us." pointed out Natasha. Tony rolled his eyes.

"Hmm, all I hear is to go with my plan. Start searching JARVIS!"

Reyna POV

"Guys, they are on to us," whispered Percy, "I overheard them, they looking us up." The eight of them were huddled together in a corner of Frank's room.

"They won't find anything. Technically, I'm dead," muttered Hazel. Nico nodded.

"But it's gonna look really suspicious," Percy said quietly. Reyna considered the options.

"Leo, hack into SHIELD again. Try to smudge out our histories or add false information. If they really question us, tell them the cover story we prepared. Jason, help him sabotage pictures if they have those. We aren't going to blow a secret we've kept for years in a week! The rest of us, try to act normal. Piper, glare less at the billionaire. Stay below radar." Piper nodded. The others looked at each other solemnly.

"You got it boss," said Leo, grinning to lighten the situation. "Besides, how bad can we screw up?"

Percy POV

"You know, I can get use to this," said Percy. He leaned back on the couch. The extra floor Tony gave them a week ago was now filled with all their equipment.

Huge windows made up one wall, showing New York in the evening. A huge circular table was near the window, surrounded by couches. Piper and Hazel had decorated one wall with Hazel's paintings. The floor had a mini fridge. Celestial bronze laptops and desktops scanned for unusual activity within a 500 mile radius. A bookshelf filled with books stored emergency weapons inside its fake back. Backpacks filled with supplies provided an easy emergency getaway. Various tables scattered across the floor had blueprints and project notes. And that was only half of it!

"It's a little too peaceful," grumbled Frank from the corner. He was sharpening an arrow with a knife.

"Agreed, New York is like a monster hot spot. There's trouble brewing," said Nico.

"I know, but –" His next words were cut off by loud siren from one of the computers.

Reyna dashed over to the alert. "Huge monster group in Central park," she said, "it's larger than a normal pack."

"Maybe they went for hotdogs? I hear there's a great place near the area," Leo joked. Percy grinned.

She frowned, cursing slightly as her fingers flew furiously over the keyboard. "The readings are fuzzy. Something's blocking the waves from identifying them."

"I told you. It's probably the Mist. It's all wacky in New York." said Hazel.

"Hazel, do you think Arion would scout for us?" asked Reyna.

Hazel nodded and whistled for her pony. After a brief conversation with Percy, Arion left, leaving a trail of dust in his wake.

"He said he was already there. The park is full of empousai and venti. Apparently, they're digging for something. Mortals are clear from the scene."

"Arm up under," ordered Reyna. "And don't forget a silver weapon." They all scattered

Percy ran to his floor. He burst into his room and threw on his armor. This one was thin but strong alloy. Throwing clothes over the metal, he strapped on a dagger and knives and checked for Riptide.

He threw the door open, startling Clint, who looked like was about to knock.

"Oh, hi Clint," said Percy quickly, "I was just about to go. . ." He tried to slide out but Clint shook his head.

"Sorry to ruin your plans, but Fury called a meeting. 43rd floor, tell you friends." He left a Percy considering options.

Deciding it would be quick, Percy gathered his friends to the 43rd floor.

Fury stood at the head of the table. The adults sat at the table. Percy and his friends stood awkwardly by a wall.

Fury looked at them. "Why are you all armed?" he asked.

"Um, we were about to do combat training," said Percy. He bounced slightly in impatience.

"Well, I have a mission for you. In Central Park, there are monsters roaming around. They resemble those of Greek mythology." Fury pulled up some pictures.

"Are they a threat?" asked Tony. "Maybe the demons things are just hanging out." Behind Percy, Leo snickered.

Percy cringed. He wasn't over fond of empousai, recalling a certain creepy cheerleader.

"They seem to have vampire like prowlness. Two mortals were seen seemingly drained of blood. We'll need Hulk for this one." Bruce squirmed slightly.

"So, we need pounds of garlic and stakes," confirmed Leo, cue glare from Fury. Leo and Tony grinned.

"Will that work?" muttered Frank. He looked like he was seriously considering the suggestion. Hazel elbowed him.

"Oh, Cap, I fixed your shield," said Tony suddenly.

"What do you mean fixed?" Steve looked at him closely.

"You know what; I meant I cleaned it for you." Leo coughed.

"As I was saying," Fury glared at Tony and Leo, "I want all of you down there. Engage them in combat." Percy and his friends exchanged worried looks, knowing their weapons would have little effect.

"Is it absolutely necessary?" Natasha frowned as she looked over the pictures.

"Yes, get going Avengers." He turned to us. "This is a chance to prove yourselves."

"We don't have to prove anything." Reyna stared down Fury eye to eye – er, eyes to eye.

"Maybe your loyalty," He swept out the door.

"Is he seriously questioning my loyalty?" choked Percy. He, Jason, and Leo broke into fits of laughter.

"Yeah, what's so funny?" Clint glanced at them curiously.

"It's an inside joke," sighed Piper. She punched Jason lightly in the arm.

"Then let's get going," said Steve.

"Ayah Captain," chorused Leo and Tony.

"Um you want us to take you?" asked Hazel.

"We're taking cars," Tony nodded. "And I doubt you can drive."

"We take our bikes," said Piper. Reyna nodded.

"And for the record, we know how to drive," Leo crossed his arms.

"It's faster if we give you a lift," argued Tony.

Jason laughed. "Shows what you know. We'll race you there. I bet 20 bucks we'll get there first."

We all clambered out into the elevator.

"Jason, that really isn't fair," said Hazel.

"It might lower his ego though," grumbled Piper. The doors opened into the garage,

Percy cracked a smile. The Avengers didn't know, but Leo had customized their bikes to with sonic rocket boosters and motorized wheels. It was also weaponized. Bikes tend to be handier as they didn't need to stay on the streets.

"Race you," challenged Jason.

"You're on," Percy mounted his bike. Painted black and deep blue, his bike use to be a mountain crusher 2.0, before Leo modified it.

"JARVIS open the door," yelled Leo. "Go Leocycles!"

"Shut it Leo," they all chorused before zipping into the streets. Central park was about 20 minutes away. Cutting through alleys and sidewalks, they made it their in five.

"I win," Jason grinned. Percy shook his head.

"I'll get you next time."

"We're ten minutes early," said Leo, "I put a tracker on the car. They haven't even left yet. So, food?"

And that's how the Avengers found the eight of them, later.

"How did you beat us?!" Tony shoved a twenty into Jason's hand. "And have time to buy ice cream?!"

"We didn't know what took you so long, so we got food," said Leo.

"Let's get going," said Natasha, "throw away the gelato".

They trekked through the trees. Percy looked over the mortals weapons.

The titanium shield might do some damaged on the monsters, or at least knock them out. Clint's arrows would have much of an effect either. Tony's repulsor beams would probably kill them. And Hulk would knock them out. As for Natasha's guns, they were practically useless.

"So what's the plan?" asked Banner.

"Hazel, take Frank to higher ground. He can shoot and you can split the empousai up. Jason, take out the venti and cover us from above. Frank can help you if necessarily. Percy and Leo take left. Me, Piper, and Nico take right. Ready?" Reyna looked around.

"You forgot us," coughed Clint.

"Looks like the girl stole you job Cap," jeered Tony from his suit.

"Have you fought these things before? Because it sound like you have experience."

Leo stepped forward. "Now, let's not argue about this. Why don't we –"

"Shut it Leo," They yelled, then abruptly fell silent.

"You think they heard that?" He squeaked.

"Hazel, go now," urged Reyna. Percy watched Frank turn into an eagle, and fly off with Hazel on his back.

Monsters burst out around them. We grouped together in a circle.

"So what's the plan?" asked Leo.

"Wait," said Reyna. They eyed the empousai. Tension filled the air.

Suddenly, walls sprang up around us, dividing us and the monsters. The walls shifted and swirled, before two corridors opened up.

"Everyone, comms on. Now split!" We scattered. Percy and Nico dove into the left passage. . .

Steve POV

They stared dumbfounded as the kids split up. Steve stared at the walls that had appeared out of nowhere. They looked pretty solid.

"What just happen," asked Bruce.

"Tony, help the Jason. The rest of us, choose a tunnel."

Steve dove into the left one after the two boys. He ran forward, before smacking into something. A wall.

"Hey," greeted a voice. Steve turned. Percy and Nico stood before him. Percy had a sword out, its blade glowing in to dusk. Nico had a pure back sword.

"You probably wonder what's going on," continued Percy, like this happened every day.

"Explain later; just show me what to hit," said Steve, "though next time, a heads up would be nice." Percy nodded. They ran forward.

"We're not use to working with others," he explained.

"Miss me?" Natasha joined them.

"We'll have a dozen at the next corner," said Percy. He readied his sword.

They turned and charged. Percy's sword sliced through the first monster, turning it to dust. Nico began dueling another. Steve stared at the monsters.

They looked like princess demons from hell, with flaming hair, claws and fangs, and tattered dresses. One leg was bronze, the other was definitely animal.

"Hey, little help?" Nico grunted as one of the claws slashed cut in his arm. He drew am knife and stabbed the demon.

Steve threw his shield. It hit one of them in the head. She turned, snarling at his direction. Behind him Natasha leaped in action, drawing guns.

"Leave mortals," the monsters hissed. "Do not interfere." He felt his senses dull slightly. Natasha wavered as well.

"Ignore them," yelled Percy. He drew a dagger and slashed at the demons with double weapons. Steve shook off the sensation. He ran forward and slammed into the demon. He smacked his shield into the demon, who passed out cold. He then jumped another.

Natasha fired off bullets, but the demons ignored them. They seemed focused on the two kids. Percy fought like a whirlwind. His blades danced so quickly, it looked like streaks of light encased his body.

Nico fought slower. His dark blade seemed to absorb the monsters. He clutched a bronze knife in the other. Shadows on the walls seemed to dance in his wake.

Soon, only one stood. It edged backward, snarling.

"You cannot stop us. He will rise. We shall prevail once more," her eyes flickered toward Nico's blade. She seemed rather wary of it.

"Half blood shall –" Percy's blade slit her throat. With a wail, she exploded into dust. He turned around.

"You ok?" he asked. He glanced at Nico.

"I'm fine, I've had worst." Steve frowned at the long cut on his arm. Percy had bruises on him and his shirt was slightly charred.

"My bullets didn't harm them, why?" Natasha glared at Percy, "it's obvious you have fought them before."

Percy and Nico exchanged glances. "Only our weapons can kill them. But you did pretty well, considering you managed to throw off the charmspeak. It took us years to train our minds."

He cocked his head. "Hazel just said she managed to group all of them in once room. We're changing to a frontal assault."

"What?"

"Hazel is losing hold her on the maze. It will disappear soon," explained Percy.

"Wait, she did this?" Steve pounded the walls.

"Yeah, anyway, she'll open a passage for us in a minute. We charge, kill monsters. Got it?" Percy looked at Nico. He sighed, and pulled a dagger out his jacket, tossing it to Natasha. "You'll need a weapon to defend yourself."

She examined the blade. "What is metal is this?"

"We call it electrum. It a gold and silver alloy," said Nico grudgingly, "And don't dent it. I particularly like that one." Natasha shrugged and gave the weapon a few experimental swipes.

"Ok, let go," Percy readied his sword. He faced the wall. It shifted and morphed into a long corridor. He ran into the darkness. Nico looked at us, before going.

"They are more powerful than they seem," remarked Natasha. Steve slowly nodded. "Let's go."

Percy POV

Percy would have preferred to fight the demons without the Avengers. It would have been a lot faster and there would be fewer questions.

Around him, his friends were deep in combat. The empousai were fast, but they didn't seem in a hurry though. It was like they wanted to get killed. It was actually a small group, about fifty or so. He grunted as a dagger skimmed his side.

Percy threw himself into battle mode. His blades slashed and cut demons down. He impaled a knife onto another's head. Piper was countering the charms, so at least it was easier to focus on fighting. Percy stabbed anything that got in his path.

"Perce, stop," He halted briefly. "Man, we need that one for questioning," Jason said quietly, landing next to him. Percy gripped Riptide. Calming himself, he felt drained as his battle senses tingled down. He stepped back, pocketing his sword. He took several deep breathes.

"Feeling merciful half brats?" The empousa spat. She grinned nastily.

"Who sent you here? It was obvious you were stalling," Reyna held her sword at the demons neck. It gave a starchy rasp.

"Why, that is no way to greet an old friend. Perseus Jackson," She gave Percy a scathingly look.

"I don't – Kelli," Percy gripped a dagger, hissing, "You look different. Did the cheerleader squad kick you out? Thought Bob would've smashed some sense into you."

"Perseus Jackson, without your precious Annabeth, it seems you have forgotten tradition. I had no idea it was now common for half lings to associate with mortals." She eyed the Avengers. "They do look delicious."

"Percy, you know her?" asked Jason, uncertainly.

"Met her a few times. You'd think she reform slower," Percy growled. Kelli yawned toothily.

"This was a nice little reunion, but I have somewhere to be." She hissed and dissolved into flames.

"I hate it when they do that," Percy sheathed his dagger. Jason summoned some storm cloud. Rain started to fall on the flames.

The demigods stared at the smothering flames grimly.

"You kids owe us a big explanation," said Steve slowly.