Accidental Avenger

by moonshade11111

Summary:

Percy accidentally becomes an Avenger which leads to a loss of Tony's sanity, a few identity crisis's, much chaos, and a bonding of Bucky and Nico that could possibly destroy the world.

Notes:

• Inspired by League of Heroes by So_Hatred

So this is the very first fanfic I have ever wrote. Please leave criticism in the comments I want to be able to grow as a writer. Also I don't know the tag system so um characters may act out of character and canon is very selective in what I am using. Also please don't ask for a timeline I have none.

Chapter 1: Why is it always explosions?

Notes:

Hi so this is my first ever fanfic I've written. Criticism is greatly appreciated. Please give me tips and tricks so I can get better at my writing.

Percy had hoped that this field trip there wouldn't be an explosion. At least this one wasn't his fault. It was Peters.

Percy doesn't know who thought it would be a good idea to take the seniors of Midtown High to the Avengers Tower but here they were. Annabeth had been geeking out about getting to meet Tony Stark (who she swore up and down was a son of Athena) while Percy was just praying to have an uneventful field trip. The gods (and/or the Fates because both were reasonable options at this point) had decided to laugh at him and provide themselves with entertainment.

Half of the grade went with Tony Stark down to the lab (Annabeth included in that well). The other half stayed with Natasha Romanoff (who was scarier than Clarisse La Rue without her morning coffee) in the sparring gym. Natasha singled him out to spar with her younger sister Yelena (he swears that she is a demigod even in the five minutes it was clear that she had ADHD and some damn good battle instincts that seemed almost godly). Percy much to his surprise fared decently well against the widow. He also managed to terrify Flash, so that was a plus. However even being the son of a god who has nickname Earthshaker (why does his dad have so many titles) didn’t stop him from falling when an explosion rocks the tower. Natasha called for another Avenger, named Kate, before heading down below. Percy being the love-struck, reckless idiot he is decided to slip away and follow her. He will admit it was not one of his finest moments. He arrived at Stark's lab to see it engulfed in flames. Reacting on pure instinct, he uses his water powers to put out the fire. Now he should’ve been fine with the Mist hiding it, but the god’s really wanted entertainment because Tony Stark and Natasha Romanoff could see through the Mist. Just what he needed.

Stark's eyes narrowed, "What’s your name kid?"

Percy kept his head held high because if he could repeatedly insult Zeus and live then he'll be fine, "Percy Jackson," he paused, "female."

Stark tilted his head almost as if he couldn’t tell whether to be impressed or offended, "Why female?"

"Well, you’re superhero name is Iron Man and the atomic symbol for iron is fe and another word for man as male. Thus, female is basically another way of saying Iron Man." Percy isn’t sure who taught him the atomic symbol for iron. It was either Annabeth or Leo, but he honestly doesn’t care it helped him in an insult . He glanced over and Annabeth had an exasperated expression on her face that couldn’t quite hide the pride in her eyes, so it probably was Wise Girl who taught him that.

Start blinked, "Very well please come to the Avengers Tower tomorrow when you get done with school. Parker over there," he pointed at Peter, who looks sheepish, "will be accompanying you as he needs to help clean up the explosion he made."

So now Percy was in trouble with the Avengers. How the Hades was he going to explain this to his mom?

---

Tony Stark sat down in the conference room with a weary sigh rubbing his hands down his face. Peter Parker had blown up one of his prototypes (Peters prototype not Tony's) and then this strange boy had wielded water to put the fire out. The rest of the team files in and sits down. Well all the team currently in tower. However he’s not seeing- "Where is Clint?"

"Up in the vents. What did you expect," Nat’s voice rings out laced with amusement.

Clint‘s head popped out for the vent overhead, leading to a startled yelp from Kate and Yelena immediately going to protect her. Clint and Nat both share a knowing look. Clint gets out of the vent to sit beside Thor, who is munching on Pop Tarts.

"So what caused the explosion," Yelena now relaxed again posed the question.

Tony leaned back, "Peter. No one was hurt. Thanks to this one kid." 

Kate piped up holding a slice of pizza Tony swears wasn’t there a second ago, "Was it that boy Yelena was sparring with?" 

Tony wasn’t even going to ask how she already knew. It was like her and Yelena were practically attached to the hip. "Yeah he wielded water and put out the flames."

Thor stopped eating his Pop Tart, "So he must’ve been one of the two new demigod I sensed." 

"I- Wait, did you just say demigod," Clint stuttered out.

"Yeah, you know half human half God," Thor’s reply was incredulous, almost as if he was shocked they didn’t know that. 

"But their myths," Clint protested.

"You have other myths among you," Thor's voice was cool. 

"No hold on. Can we rewind back to the part about new demigods? Who the hell is a demigod here," Wanda’s voice broke through. 

Thor blanked like it was obvious, "Kate and Yelena, of course."

Everyone stares at him for a solid minute and stunned silence before Kate and Yelena simultaneously shout, "What the absolute flying fuck?" 

“You guys didn’t know? I mean, I don’t know what pantheon you two hail from but I do know it’s not Norse,” Thor replies, opening another Pop Tart.

Tony runs a hand through his hair sighing, “You mean to tell us that not only are Yelena and Kate demigods, but Norse gods aren’t the only group of gods out there?”

Thor nodded, “Yes, Greek, Roman, and Egyptian.”

Tony was getting a headache from all this or maybe it was a 72 hours with no sleep but regardless. “OK meeting adjourned for now. We will reconvene in the morning to talk about the boy.”

“But it’s only 5 PM,” Wanda protests.

“Yes, but you’re giving me a headache.” Tony stood up and open the door, meet his wife Pepper standing in the doorway. 

“No honey, it’s the fact that you’ve been up for 72 consecutive hours.” Pepper was quick to correct him and wasn’t gentle about it either. “Now go to bed or I’m knocking you out with a horse tranquilizer.”

“Yes ma’am,” Tony to do as he was told she made good on her threats. As he headed to his room he couldn’t help thinking that even though two members of the team we’re currently having an identity crisis at least no one was climbing someone else like a tree. So all in all, it was a good meeting.

Notes:

So how do we like the idea of Kate and Yelena being demigods? Please don't ask how they survived I've only written to chapter 2 I have no clue yet.

Chapter 2: What just happened?

Summary:

The consequences of Percy's actions have come.

Peter has always been wary of Percy. The second he saw the guarded look in the other boys eyes, the scars littering his arms, and what appeared to be a brand on his left forearm. Peter knew Percy was dangerous, that he had lived through things that could’ve been on par with the Avengers themselves. That didn’t stop him from befriending Percy though. After getting to know him, Peter can confidently say that Percy is quite literally the personification of sunshine.

“I think I’m gonna die Peter. I insulted an Avenger. Oh gods I’m gonna die.” Percy appears to be spiraling, again, this is like the fifth time today. 

Peter suppressed a sigh, “Percy you are not going to die okay.” There was no way any one of the Avengers was gonna kill Percy, not after they saw him wield water to kill a fire.

Percy looked at him, “You sure man?”

Peter smiled placing a hand on his shoulder, “I’m sure.”

It wasn’t hard to see how Annabeth fell in love with this adorable goofball. Percy is cute, a massive bundle of nerves (normally but Peter was choosing to ignore the explosion for now), a bit of a rambler, incredibly shy if he doesn’t know someone (except for Mr. Stark apparently), the sweetest person ever (again excluding Mr. Stark). If Peter didn’t know any better he’d say Percy would dissolve in the rain like cotton candy. But Percy loved the rain he always looked alive in the rain. Maybe MJ was right Peter might not be straight.

“Hey Peter.”

“Yeah, Percy?” 

“You seem weirdly chill around the Avengers. Why is that?”

Peter froze trying to remember his lie, “I’m an intern at Stark Industries.” Peter hopes he buys the lie.

Percy’s eyes narrow briefly before it fades and his lazy smile returns, “Cool.”

---

 

Percy didn’t buy the lie one bit. There was absolutely something Peter was hiding from him. They walked the rest of the way in silence, Percy fidgeting with Riptide (in pen form) and Peter texting someone. They arrive the tower, where apparently Peter knew the security guard by name. 

“Hey, Happy.”

“Greetings Peter. Is your aunt free this evening,” The security guard apparently named Happy asked almost seeming hopeful. 

Peter sighed, “I think so and Happy I give you the OK to date her.” Happy lit up and let them up onto the elevator.

So there was definitely something more than Peter’s lie about him being an intern as Happy decided to ask him for permission to date his aunt. Percy decided to do a full-blown interrogation later.

Tony Stark met them as they walked out of the elevator, “Follow me.”

The two boys followed him into a conference room where some of the other avengers were sitting. Percy spotted Natasha, Yelena, and Kate all who he met yesterday. He recognized Thor from Magnus Chases (Annabeths cousin who was an undead Norse demigod) endless rants about stopping Ragnarok. He assumed he saw the Maximoff twins based off the red (what does he even call it?) glow around the girls hands and the boy looking like he wants to run. Percy, however, was not expecting a man to pop out of the vents like a bird.

Stark sighed before saying, “All right, let’s get down to business.”

Peter piped up, “Business about what?”

Stark glanced at Peter before motioning to Percy, “What to do with him.”

Percy felt more dread in his stomach than he felt in Tartarus.

---

Yelena decently like the boy. He was skilled at hand to hand (almost as if he was trained), he was witty and sarcastic even while fighting (he dared to correct her technique and she was in assassin), his nicknames were awesome (after Nat told her about this kid calling Tony female there was suddenly a new contact name going in her phone).

“I’d say we let him join the team. He’s pretty good at sparring and it could be useful to have someone who can wield water.” Kate, Yelenas girlfriend? best friend? friend with benefits? (Yelena honestly wasn’t sure what the label was anymore) spoke up first.

Thor spoke next his normal companion of Pop Tarts missing, “I agree Magnus Chase spoke highly of you, Perseus Jackson. You would be amazing on the team.”

Percy’s head ducked, “Thank you Lord Thor.” The teen seemed bashful to Yelena. 

Tony broke the silence, “Does anyone not want him to join?”

Pietro grinned wickedly, “How well can you prank people kid?” 

Percy smirked, his unnatural sea green eyes glinting, “How far am I allowed to go?”

Yelena sighed in time with Tony. They may have just made a mistake.

---

Magnus watched Samirah sit down at the table with a sigh, “I swear, if I have to sit through another one of Oden‘s PowerPoints-“

“You’ll sigh and deal because you wouldn’t dare go against the All-Father,” Alex Magnus‘s girlfriend- no boyfriend Alex was definitely a boy right now- interrupted.

Sam scowled and Magnus took that as his cue to go get more falafel (no it wasn’t purely because he was obsessed with falafel, not at all).

When Magnus came back 10 minutes later with more falafel than any reasonable person should have Alex and Sam were reading a letter.

Alex looked up, “Remember Percy Jackson?”

Magnus nodded, “Yeah son of Poseidon, Annabeths boyfriend, taught me how to work a ship, has the pen sword Jack wants to date.”

He sighs, “He sent you a letter.” Alex passed the letter to Magnus.

Magnus read the letter once blinked and read it again. “Am I reading this right?”

Sam shook her head, “No you’re reading it right. Percy did say that Thor wanted him on the team based on what you said. Also yes Percy is an actual Avenger named Stormbringer.”

Magnus let out string of cussing that would’ve made Mallory proud. Sam face palmed while Magnus’s lovely boyfriend laughed like a hyena (no, it wasn’t a figure of speech Alex genuinely sounded like a hyena). “How did in the 9 realms did that happen?”

Notes:

I finally have a plot ish but regardless. I've also finished chapter three. Plot doesn't come in until chapter four though.

Chapter 3: Carbon Copy

Summary:

Nico and Bucky finally meet.

When Bucky came back to the tower after a month long mission with Sam and Steve, he was less than pleased to find out another teenager had joined the team. The kid didn’t seem too bad however, he was incredibly cagey about his past heritage. He also swore the kid was on drugs with his wild tale of jumping off the Gateway Arch and landing in a body of water. Also, the brand on the boys arm concerned him. How did the 17 year-old have a brand? Was he involved in something illegal? Bucky was honestly scared to ask.

Sipping some of his coffee after mission debrief, Steve said, “Apparently Kate and Yelena had an identity crisis while we were gone.”

Sam snorted, “Did those two finally get together?”

Bucky rolled his eyes, “One can only wish. It’s so painfully obvious that they like each other.”

“This coming from the guy who couldn’t tell I liked him for 100 years,” Steve smiles.

“I was brainwashed for most of it! You can’t blame me there Steve!” Bucky protests, while Sam cackles in the background. 

Clint chooses now to drop out of the vents with an audio recorder before running out yelling,”Pietro! Percy! I got it! I got the recording! Cap confirmed it! He likes Barnes!” Steve proceeds to run after him with Sam laughing his ass off before following Steve. Bucky sighs realizing Percy hasn’t even been here a week before causing chaos.

Alarms suddenly blare alerting Bucky that there is an intruder in a the building as a small boy appears from the shadows in what appears to be an aviator jacket. The boy mutters, “this isn’t Miss Jackson’s house.” 

Bucky activates his comns, “I’ve got the intruder Stark. I can handle him alone.” He turns to the teen growling, “Now who the hell are you?”

---

Nico, sadly, was not getting any of Sally Jackson’s cooking this evening. He sighs looking at the man with the metal arm, “Look I made a mistake. I wasn’t meant to be here.” 

The man scoffed, “I call bullshit. You teleported into a secure building son. You don’t just do that on accident.”

So Nico’s attempt at the diplomacy failed- well at least he tried. “Did you just call me son?”

The man looks at him, “This is your entire take away?” He sounds confused and like he doesn’t understand teens. 

“Yeah, sorry it’s just I haven’t heard it in ages,” Nico shakes his head dismissing the idea that this man could be from the 1940’s. “When I was a kid everyone in the US was saying it.”

The man tilts his head his guard visibly lowering, “Aren’t you like an adolescent?” 

“Physically speaking? Yes. Mentally speaking? No I’m from the 40s.” Nico was waiting for the confusion that usually accompanies that sentence. 

“Were you frozen in time too,” the man asks. 

Nico was fairly shocked that he hit the nail in the coffin. “Yeah the Lotus Hotel and Casino.”

The man tilts his head, “Is that owned by Hydra?”

Nico blinks, “Who?”

“Scientific branch of the Nazis.”

Nico blinks again, “What?”

The man nods, “I’m assuming that means no.”

Nico sighed, “Annabeth told me the Nazis were defeated.”

“The majority of it was except for Hydra granted they’re more Russian than German now.”

“Does this mean you were frozen in time?”

“Yes, cryogenically.”

Percy choose this moment to burst in through the door yelling, “He’s safe Barnes! Don’t worry!” 

Bucky turns around to face him, “I figured that out Jackson.”

Nico’s brow furrows, “Barnes?”

Barnes turn to Nico again, “You may call me Bucky.”

Percy looks appalled, “How come he gets to call you Bucky and I don’t?”

Bucky responds, “Because I like him unlike you, Jackson."

Percy‘s mouth drops in shock as Nico suppresses a small grin.

---

What the Hades? How did Bucky Barnes, the winter soldier, hater of all things new, quickly like Nico Di Angelo, son of Hades, who hates people? And how did he get the demon spawn to smile? Percy didn’t like this one bit.

Percy blinks out of a stupor, “Nico why did you shadow travel here?”

Nico looks at him like the answer was obvious, “I wanted some of your mother’s cooking. Also, I wanted to see Estelle.”

Percy nods, understanding his reasoning perfectly, “Yeah no that makes sense. You’re here so you might as well stay for dinner is cooking tonight. Wanda’s cooking so it’s gonna be good.”

Nico pulls out a Kitcat and opens it, “All right I’ll stay. Will would kill me if I shadow traveled so soon already. Also I wanna know what in the Tartarus all this is.”

---

While making peprikash Wanda was joined by Natasha without turning around Wanda greets, “Hello detka.”

Nat responds in Russian, “Hello my little witch. Did you hear that we are having a guest tonight for dinner?”

Wanda’s brow furrows as she continues stirring the pot responding in Russian, “No I didn’t. Anything I should know?”

Nat nods, “Barnes gave him the seal of approval.”

Wanda blinks, “The guest can call him Bucky?” 

At this moment, Percy and a tiny kid whose clothing screamed emo except for an aviator jacket walked in. The kid also looked pale as a ghost, and had eyes that looked as sunken in as a corpse. The small boy also held the same vibe as Percy. The kind of vibe that he’s been through more than he should and that he won’t hesitate to mess you up if needed.

Wanda was about to go into the kids mind when Percy bravely spoke up, “If you would please stop planning murder in Russian I would like to introduce you to my cousin Nico he’s staying for dinner.”

Nat looks over at them, her eyes flicking between Nico and Percy, “You look nothing alike.”

Percy shrugs, “We’re related on my dad’s side.” He rested the arm on the young boys head leaning on it. 

Nico scowls, “Jackson if you do not stop leaning on me, Estelle will no longer have a brother.” 

Percy immediately straightens looking, frightened, “got it.”

Wanda sighs, “How can you handle spices?” 

Nico grins, “I grew up in Italy, bring it.” 

Nat shakes her head, “Oh yeah, he’s doomed not as much as Percy but still doomed.”

Percy stutters out indignant, stubborn response that sounds like pure gibberish. Nico sports a grin that unnerves Wanda with the threat that grin held. “Annabeth is so getting told about this.”

Percy looks panicked, “No, please don’t Neeks.”

Nico shrugged, “I’m doing it and Will already knows all the embarrassing things about me that you do.”

Wanda burst out cackling as it’s clear who won the nonexistent fight.

Notes:

Why are Bucky and Nico so similar? What is this? But minor existential crisis put on back burner I'm going to go eat blue fudge (iykyk).

Chapter 4: Who rang Set?

Notes:

HI everyone sorry for no update last week I was out of town last weekend and had no internet. I apologize. In other news I will be incorporating darker element into this story. This chapter mentions drug use. It's during Clint's POV if you would like to skip.

Clint watched through the slits of the vents as all the Avengers filed into the dining room. He saw Percy‘s friend chatting with Barnes, without Barnes being annoyed. That duo may not end well. Clint opens the vent cover and slides out, the metal groaning as he takes a seat beside Pietro surveying the room. Wanda and Nat were being their normal self conversing and quiet Russian (thankfully not murder). Thor was staring at the new teen, wary of him, Kate and Yelena were in a heated debate about how both of them survived, Percy was trying to avoid getting dragged into the argument and was failing miserably, Tony and Peter were learning out about some tech thing, while Steve and Sam just looked at Barnes voluntarily talking to a kid shocked. Clint finally looked at Pietro and pauses. Pietro‘s eyes were bloodshot his peoples dilated.

“Wanda, I think your brother took something before dinner,” Clint spoke up still staring at Pietro intently. 

The whole room went silent as Wanda turned to Clint and Pietro, “Yeah. Yeah he did.” Wanda sighs, “He’ll be fine and if needed, we search his room for drugs and throw them away.”

Clint nods, “Very well.”

Thor turns to Nico, “You seem out of place here. Why?”

Nico picks at his food, “Because I’m not used to many adults being nice to me. Also, all of you are heroes and you’re a god Lord Thor.”

Yelena pipes up, “Percy do you collect strays?”

Percy chokes on his food as Nico cuts in, “You know you’re not the first person to ask him that. He took in a stray dog once.” 

“Its owner asked me to take it in! Therefore it wasn’t a stray!” Percy protests. 

“What about Tyson? Blackjack? Hazel? Frank?” Nico rebukes. 

Percy size falling silent for a moment, “OK you have me beat there.”

Wanda spots Nico picking at his food, “Is it too spicy for you?”

Nico shakes his head and starts to respond when Pietro interrupts, “Why is it called a double U when it’s comprised of two of V’s?”

Everyone turns to look at Pietro, forks halting midair as everyone sits in shock. After a few minutes Wanda stands up, “OK Pietro let’s get you to bed.” The two Maximoffs leave.

Kate breaks the silence first, “You know he has a point.”

Clint hates to admit it, but Pietro really does have a point. The naming convention of that letter made no sense and that knowledge will be keeping Clint awake all night now.

Nico‘s eyes flicker between Kate leaning close to Yelena, and Yelena looking at Kate like she’s her whole world. “How long have you been dating?” Nico’s blunt question rings out like a gunshot in the now silent room. 

---

Kate freezes like a deer caught in headlights as she feels Yelena stiffen beside her. “We aren’t dating.”

Kate swore she heard Yelena mutter, “Not yet” but chalked it up to wishful thinking when Yelena said, “Yeah we’re not dating. I don’t know what gave you that impression.”

Nico looked amused, “You two look more in love than Percy and Annabeth do and that is incredibly hard to beat. You cannot seriously expect me to believe you guys aren’t dating.”

Kate feels her cheeks heat up slightly, “We are being serious. The two of us are just friends that’s it.”

Nico is adamant, “Yet you’re blushing and she is looking at you like you’re the most important thing in the world to her.”

Kate turns to face Yelena seeing only her normal gaze. “She always looks at me like that.”

Kate hears Clint sigh, “For God’s sake just kiss already.” Kate didn’t have time to respond when Yelena’s lips were on hers in a gentle kiss. 

---

Yelena was praying that kissing Kate is a good idea. Kate briefly pauses before and kissing her back softly. Yelena pulls away first only enough to rest her forehead on Kate’s. “I’ve liked you for a while now little bird. I just wasn’t sure you swung my way.”

Kate smiles shyly, “I’ve wanted you for a while too.”

Yelena pulls Kate closer, whispering loud enough the resident asexual, Sam Wilson to hear, “And I’ve always wondered what those fingers are good at besides archery.” Kate’s face blushes the cutest shade of red. “You look adorable all flustered like that. Can’t wait to see how flustered I can make you.”

Sam gags, “Ew gross get a room you two.” 

Yelena laughs leaning back in her chair as she swings an arm around Kate, “Yeah yeah whatever Sam.”

Wanda walks back in Pietro no longer by her side, “Are you finally together?”n

Yelena nods as Wanda sits back down muttering, “Took you two long enough.”

Tony claps his hands together, “OK who wants to go play board games?”

Percy grins, “You’ll love this Neeks. We give death threats playing Monopoly. You’ll fit right in.”

A few hours later, Nico went home well, he just dissolved in the shadows, and everyone else went to bed (Kate was going to sleep in Yelena’s room) and Yelena can say that Nico absolutely fit right in and delivered threats that scared her.

---

“And that is how to Duat is sectioned off. Next time we will talk about Ra’s nightly journey through the Duat.” Carter Kane’s voice rings out, “Class dismissed.” 

As the class files out, Carter hears a voice in his head, one he hasn’t heard in a year, Hourus- The time has come to save the world again. You’ll need to be my host again soon Carter Kane. 

Carter freezes momentarily before packing up his stuff. He turns to leave and is greeted by a solemn looking Sadie and a cat that looks suspiciously familiar. “What do you need Sadie?”

Sadie takes a deep breath as she walks into the room setting the cat down, “We need to talk.”

The cat transformed into Bast just like Carter suspected. “Talk about what?” He asked concerned. 

Bast stretched out the, “The fate of the world.”

Carter paled as Sadie sighed, “Has Horus contacted you yet?”

He nodded, “Yeah I was contacted. I take it you were as well?” Sadie nodded as he turned to Bast, “Why are they talkative again?”

Bast looked down sighing, “Because Apophis is free again and it’s just up to us to stop him.”

Notes:

I'm now on Tumblr you can find me under moonshade11111sshitposts please check it. You'll get some stuff for kinktober as well as little tidbits and extras to the Accidental Avenger. Also if anyone wants to be a beta reader message and I will send you chapter 5 as soon as I can.