When Magic Meets Iron

Harry Potter - J. K. Rowling The Avengers (Marvel Movies) Spider-Man (Tom Holland Movies) Iron Man (Movies)
F/F
F/M
Gen
M/M
G
When Magic Meets Iron
Summary
War ended at when harry turned 15.(With all the books squeezed in the period from when harry recieved his letter to 15 year old).Harry became a saviour but that wasn't important to him, what's important was his little godson who calls him daddy.So to finally be free and to raise teddy away from the mess and fame, harry moves to new york where his unexpected bio dad lives, no— not to cultivate relationship between them but he couldn't miss the chance to provide teddy more family.If Tony Stark refuse then ..oh well he doesn't need him.He settled into a Potter townhouse in Queens.Ps.I would appreciate reviews in comments. It helps encourages to write this fic.P.P.s This fic is self indulgent and will not be canon compliant. Don't like it? Don't read. Like it? Thankyou very much.(Not beta read. If any errors are found— do comment, I'll change it if necessary.This story is for fun. Constructive feedback is welcome, but personal attacks or trolling will be deleted. Let’s keep it respectful.)
All Chapters Forward

Finally some Rest.

Harry was finally asleep.

Tony stood at the doorway of the guest room, arms crossed, watching the kid—his kid—curled up on the bed, holding onto both of his tiny, fierce children like a lifeline.

Teddy was buried against his side, his small fingers clinging to Harry’s shirt, while Delphine was sprawled half on top of him, her little hand gripping his hair.

It was a sight Tony hadn’t prepared for. He’d barely wrapped his head around one grandkid, and now there were two.

Rhodey let out a low whistle beside him. “Not gonna lie, Tones. This is kind of adorable.”

Tony scoffed. “Yeah, yeah.” His voice was gruff, but he didn’t move.

Rhodey gave him a look. “You know they consider you as family right? Harry practically declared you as his person.”

Tony swallowed. “They’re mine too. No one’s gonna touch them.”

Rhodey smirked. “There it is.”

Tony rolled his eyes, but his gaze softened as he watched the sleeping trio. Mine. Yeah, that sounded about right.


Pepper was making coffee when Peter slumped into a chair, still looking dazed.

“I’m gonna say it,” Peter announced. “Harry’s kids? The best people I’ve ever met.”

Rhodey raised an eyebrow. “Because?”

Peter held up a finger. “One: Teddy is a tiny warrior and kicked Captain America for hurting his grandpa.”

Tony smirked into his drink. “Not gonna lie, that was the highlight of my day.”

“Two,” Peter continued, “Delphine has better aim than half the Avengers.”

Pepper hummed. “Speaking of… that rattle?”

She looked at Tony. “It shouldn’t have done that much damage.”

Tony tapped his fingers against the counter. “Yeah, that’s been bugging me too. Kid’s probably—most definitely reinforced it.”

Rhodey snorted. 

Pepper straightened. “Well, if Harry’s going to be staying here, we need to prepare.”

Pepper sipped her coffee. “I’m baby-proofing the penthouse.”

Tony nearly dropped his glass. 

(How could he forget?

Is he already fucking this up?

He pushed the incoming panic away.)

Pepper gave him a pointed look. “There are two toddlers here”

Peter grinned. “Grandpa Tony.”

Tony groaned. “You’re all fired.”


Later—

Peter barged in, practically vibrating with excitement.

“Aunt May! Ned! You won’t believe what happened today.”

May set down her book. “Oh no.”

Ned leaned forward. “Dude, tell me everything.”

Peter took a deep breath. “Okay. So. Harry punched Captain America in the face.”

May choked. Ned gasped.

“And then Teddy kicked him in the shin—”

“Oh my God,” May whispered.

“—and then Delphine—who Harry recently adopted by the way—threw a rattle so hard it made him bleed.”

Dead silence.

Ned whispered in awe, “Harry’s kids are legends.”

Peter nodded solemnly. “They really are.”

May groaned. “I don’t even know where to start with this.”

Peter beamed. “Start with the fact that I have the coolest big brother and the best niece and nephew in existence.”

"Or the fact that Harry has a knight hood at 15? Or that he is higher than C's Paygrade —like what is above that- definitely not SHIELD according to Mr.Stark ,Or How about that Harry's aunt and uncle are shi-bad people, Or that Harry basically didn't have a childhood?."

The more Peter spoke the more he upset he got.

Ned's expression became blank.

May rubbed her temples. 


Sam knew this conversation was going to be a mess before he even started.

He barely got through the first sentence before Clint burst out laughing.

Clint wheezed, gripping the table for support. “A sixteen-year-old decked Steve in the face, told him off, and then his two toddlers finished the job after another fifteen year old punched him.?”

Bucky was still stuck on one part of the story. “The kids? How old are they?”

“the boy is three. The other possibly a girl by the dress is barely two.”

Bucky squinted. “And she made Steve bleed with a rattle?”

“That’s the part that really got me, man. It was reinforced definitely.”

Clint’s mouth twitched. “You’re telling me a baby sniped Captain America?”

Sam deadpanned. “I wish I was making this up.”

“This kid. I don’t even know him yet, but I respect him.”

Bucky’s eyebrows furrowed. “What’s his deal? Like, where’d he come from?”

Sam shrugged. “No idea. All we know is that he’s young,probably around 15 or 16—he's tiny— and  protective of Tony. The other kid, said they are interns.”

(Although he didn't look tiny when threating Captain America.)

Clint smirked. “Now that’s something I didn’t have on my bingo card.”

Bucky narrowed his eyes.“Steve just—what? Took a punch, heard this, and just stood there?”

Sam sighed, rubbing his temples. “Well, he didn’t have a choice. The kid punched him, gave him a warning, and then just—left.”

Clint snorted. “Man just hit Steve with a Batman-level threat and walked off with his kids like a badass.”

“You should’ve seen him, man. When Steve asked who he was talking about, the kid didn’t even hesitate. Just—” Sam mimicked Harry’s deadpan delivery—“‘Tony.He is my person .Do not touch him again. You don’t want to find out the consequences.’”

Bucky let out a low whistle. “Damn.”

Bucky’s lips twitched. “I’m starting to like this guy.”

Bucky let out a low whistle. “Damn. Those kids are built different.”

Clint chuckled. “ I need to shake his hand and meet the toddlers.”

Sam shook his head. “I don’t think Tony’s gonna let anyone near him anytime soon.”

Clint grinned. “And Steve?”

Sam and Bucky smirked. “Never. Living. It. Down.”


Peter barely had time to sit down at their usual lunch table before Ned nearly bounced out of his seat in excitement.

"Dude, I still can't believe you and Harry punched Captain America!" Ned whispered, eyes wide with admiration. "Like, you actually—bam—just right in the face! Both of you! That’s legendary!"

Peter sighed, rubbing his face. "It wasn’t that big a deal."

(It's nothing compared happened in airport battle)

Ned scoffed. "Are you kidding me? You and your pseudo big brother tag-teamed in avenging Mr. Stark’s honor! That’s peak awesome. Steve Rogers totally had it coming."

"Exactly!" Peter said. "I wasn’t even planning on punching him, but then Harry went for it, and—man, I was just so mad! After everything Steve did—leaving Tony to die in Berlin—I couldn’t not hit him!"

Ned nodded furiously. "He deserved it."

"Thank you!" Peter said, throwing his hands up. "Finally, someone gets it!"

"What are we getting now?" MJ’s voice cut in as she slid into her seat across from them. She gave Peter a knowing look. "What did you do?"

Peter hesitated. "Uh—"

Ned grinned. "He punched Captain America."

MJ blinked, then smirked. "Nice."

Peter groaned. "I feel like you should be more shocked."

"Parker, please," MJ said, rolling her eyes. " If you were pissed enough, of course you'd punch a national icon. And this was about Stark?"

Peter shifted. "…Maybe."

MJ shook her head, but there was something approving in her expression. "Alright, so what exactly happened?"

Ned, still grinning, jumped in. "Peter’s big bro—uh, I mean, his mentor-slash-friend-slash-awesome person—"

Peter shot him a look.

"—punched Captain America first, and Peter followed up because they were both mad." Ned finished.

MJ looked mildly impressed. "Huh. Didn’t think you had it in you, Parker. But I like it." She pulled out her book and flipped it open. "So, what’s next? You throwing down with Thor?"

"Oh, God, no," Peter said quickly. "I like my bones intact, thanks."

"Good choice." MJ turned a page, then added, "So, when do I get to meet this mysterious Harry?"

Peter blinked. "Uh—what?"

MJ didn’t even look up. "C’mon, you’ve been talking about him non-stop. Ned’s already met him. He seems to know about you being you-know-who. Seems unfair I’m out of the loop."

(Ron: LOL. Since when did Peter become you-know-who.

Hermione:*shakes her head* They don't know, Ron.

Harry: I can't imagine Peter scaring a spider—infact I'm pretty sure he's scared of spiders—forget about being a Dark lord.

Peter: Hey, I can be scary when I want.

MJ:*snorts*

Ned: Peter you think flys are a security hazard.

Peter: This is bullying *pouts*.)

"I mean—" Peter glanced at Ned, who shrugged with an amused grin. "I guess? It’s just—he’s really busy right now, with Teddy and Delphine and all."

MJ finally looked up. "Teddy and Delphine?"

"Yeah," Peter said, his expression softening.

"Teddy’s his son—godson really but basically his son- Don't say otherwise, and Delphine—well, he adopted her recently. He’s got this whole protective dad thing going on."

MJ raises an eyebrow. "How old is he?"

Ned: "sixteen."

MJ considered this. "So a sixteen year old is raising two kids, and punching superheroes for fun?

(How does a 16 year old gain custody of not one but two toddlers?

This is suspicious.)

Peter laughed. "Basically?"

Ned leaned forward. "And he totally pseudo-adopted me too. So, you know, I’m kinda like Peter’s brother too now. I met Teddy and he's awesome, I can't wait to meet Delphine."

MJ smirked. "Alright, I definitely need to meet this guy."

Peter sighed, but there was no escaping it now.

"Yeah, yeah. I’ll see what I can do."

"Great." MJ leaned back.

"Now, since we’re all here, what about Decathlon this year, or are we just gonna coast on our genius again?"

Peter groaned. "Oh no, she’s going into team captain mode."

MJ smirked. "Damn right I am. Now, let's talk strategy."


The smell of fresh coffee and warm pancakes filled the air as Harry stepped into the kitchen, carrying Delphine on his hip while Teddy trailed sleepily behind, clutching at the hem of Harry’s shirt.

The morning sunlight streamed through the windows, giving the penthouse a cozy, golden glow despite its sleek modernity.

Tony sat at the breakfast table, scrolling through his tablet with a cup of coffee in hand. Pepper was by the counter, stirring her own drink as she glanced up.

Her gaze softened immediately at the sight of Harry juggling two kids with an effortless grace.

“Morning,” Harry greeted, voice slightly rough with sleep but warm nonetheless.

Tony arched a brow. “Morning, kid. Huh. You actually look like you slept for once. Do I need to check for pod people?”

Harry snorted, setting Delphine in her booster seat before helping Teddy climb into his own.

“Your beds are dangerously comfortable. You should warn guests about that. Might steal one.”

Tony smirked. “Good luck sneaking a whole bed out of here. I’ve got security. Or, I don’t know—you could just move in.”

Harry leaned in slightly, eyes glinting with mischief. “Where’s the fun in that? I like a challenge.”

Tony felt a ridiculous amount of warmth at that—not a no.

Pepper, already charmed beyond belief, set a plate of pancakes in front of Teddy, who gasped dramatically.

“PANCAKES!”

Harry chuckled, ruffling Teddy’s curls.

“Eat slow, yeah? Don’t want you turning into a pancake yourself.”

Delphine, as if understanding, smacked the table with tiny hands and made happy baby noises. Harry, without thinking, pressed a kiss to the top of her head before giving her a spoon of mashed fruit.

She kicked her legs excitedly.

Tony watched, arms crossed.

Harry was sixteen.

Sixteen and seamlessly looking after two kids like he’d been born for it. 

“So,” Tony started, smirking as he leaned back, “you gonna tell me how your daughter managed to nearly concuss Captain America with a baby rattle?”

Harry snorted, entirely unfazed.

“Oh, that? Simple. I made her toys extra durable. Kids break things, and I got tired of replacing them.”

Pepper shot him a knowing look. “That’s… an unusual thing to do.”

Harry just smiled like he knew something they didn’t. “Call it future-proofing.”

Teddy, with his mouth full of pancakes, waved his fork enthusiastically. “Delphi strong! Just like Daddy!”

Delphine heard her name, giggled, and proceeded to throw another spoon to the floor.

Tony chuckled, shaking his head. “Alright, so she’s got some impressive aim. But you? You clocked Cap first. Gotta say, never thought I’d see the day.”

Harry rolled his eyes but smirked. “He had it coming.”

Pepper gave him a pointed look. “Violence isn’t always the answer, Harry.”

Harry tilted his head as if considering. “Maybe not always. But it gets the message across.”

Tony pointed at him. “I like you.”

Harry grinned. “I know.”

Pepper groaned but couldn’t hide her smile. “Great. Another one.”

Tony smirked and leaned back. "You’re kind of a natural at this whole parenting thing. Not bad for a so-called sixteen-year-old.”

Harry shrugged, cutting up Delphine’s food. “You learn when people depend on you.”

Pepper’s gaze softened. “You know you’re not alone anymore, right? You don’t have to do everything by yourself.”

Harry hesitated, then nodded slowly, a small but genuine smile forming. “Okay.”

Teddy beamed. “That means more pancakes, right?!”

Tony laughed. “Kid’s got his priorities straight.”

Harry chuckled, leaning back.

Pepper smirked. “That’s right. Welcome to the family, Harry.”


Harry was ensuring Teddy and Delphine were settled before heading out. He wanted to personally inform Happy that his kids would be at the Tower.

Not because he didn’t trust Tony—Tony had proven himself—but because Harry was naturally paranoid. Informing multiple people ensured extra layers of security.

On his way to Happy’s office, something caught his attention.

Two maintenance workers stood near a restricted access door, their uniforms neat but off.

Their stance was too rigid, movements too rehearsed. More importantly, they were too quiet—no casual chatter, no muttered complaints. Just forced nonchalance that set off alarm bells in his mind.

Harry’s magic hummed in warning, subtle but insistent.

Something about them wasn’t right.

He adjusted his path, acting like he was walking past them, and lightly brushed his fingers over the rune bracelet on his wrist, activating a silent detection spell.

Immediately, he sensed faint traces of tech cloaking their presence from FRIDAY’s sensors.

It was sophisticated—too sophisticated for ordinary intruders. 

Yeah, these guys weren’t maintenance workers.

Instead of confronting them outright, Harry ducked into the shadows and pulled out his phone.

A quick text to Happy: Possible security breach. Two fake maintenance workers outside sector D. Investigate quietly.

Happy’s response was instant: On it. Stay put.

Harry rolled his eyes.

He positioned himself at a vantage point, watching as Happy and a few trusted security personnel casually approached the intruders.

The moment Happy got too close, the men stiffened, realizing they’d been made.

One reached for something in his pocket—a weapon, most likely—but Harry wasn’t about to let that happen.

With a flick of his wrist discreetly, Harry sent a tiny pulse of magic toward the man’s hand.

He yelped as his fingers spasmed, dropping whatever he’d been reaching for.

The second intruder tried to run, but Happy and his team were faster. Within moments, both men were pinned, their weapons discreetly confiscated before any alarms could be raised.

Harry stepped forward as Happy barked orders into his comm, calling for a full security sweep. The older man turned to Harry, raising an eyebrow.

"Good catch, Evans," Happy muttered, both impressed and annoyed. "How the hell did you notice them? FRIDAY didn’t pick up a thing."

Harry shrugged. "They felt wrong. I don’t like when things feel wrong."

Happy gave him a long look before shaking his head. "You got good instincts, kid. I owe you for this one."

Speaking of —Harry suddenly remembered his original reason for coming here. With a smirk, he turned to Happy. "Speaking of owing me, I was actually coming to ask if you were free today."

Happy frowned. "For what?"

Harry grinned. "Grandpa and uncle day. Or maybe grandpa and aunt if Pepper’s up for it. Thought you might want to spend some time with Teddy and Delphi."

Happy blinked. "Wait, you’re trusting me with the kids?"

"Shocking, I know," Harry said, amused.

"Figured you’d enjoy the company. Besides, might as well start getting used to the idea of having grandkids running around."

Happy let out a long-suffering sigh, but the pleased look in his eyes was unmistakable. "You’re a pain. But yeah, I’ll do it."

Harry smirked. "Knew I could count on you. Just—don’t let Delphi throw anything at people, alright?"

Happy muttered something under his breath, but Harry was already walking away, feeling just a little more settled than before.


Harry returned to the penthouse feeling more at ease after the whole security breach incident. Knowing that Happy had things under control helped, but there was always that underlying wariness he couldn’t quite shake.

(Constant vigilance)

Stepping inside, he was greeted by the sight of Teddy and Delphine playing with some of the high-tech toys Tony had provided.

Teddy, ever the imaginative one, was pretending to fly one of Tony’s old helmet prototypes like it was a spaceship, while Delphine was giggling as Pepper held her up, pretending she was soaring through the air.

Tony, seated at the breakfast bar, looked up when Harry walked in.

“Well, well, if it isn’t our resident security specialist,” he teased. “Heard you took out some intruders.”

Harry smirked, flopping onto a nearby chair. “Didn’t take them out. Just noticed them being shady and let Happy do the honors.”

Pepper raised an eyebrow. “That’s still impressive. FRIDAY didn’t detect them at all.”

Harry shrugged, not about to explain that magic had played a role in it. “They were weird. Too stiff, too rehearsed. Figured it was worth looking into.”

Tony eyed him, something  flickering in his gaze before he turned back to his coffee.

“Well, good job, kid. Now, are you actually going to eat something for lunch, or do I have to remind you that existing on caffeine and sheer stubbornness isn’t a long-term plan?”

Harry snorted. “Coming from you?”

Teddy, ever the opportunist, took that moment to chime in. “Grandpa Tony drinks lots of coffee! He says it makes him smarter.”

Pepper sighed. “No, sweetie, it just makes him functional.”

Tony huffed. “Hey! I’ll have you know I’m a genius even without coffee. Coffee just… enhances the experience.”

Harry shook his head, amused. “Right. Sure. Anyway, I was thinking of heading out for a bit today, and I wanted to ask if you were free.”

Tony blinked. “Free? For what?”

Harry smirked. “Grandpa and uncle day. Or grandpa and aunt day, depending on if Pepper’s interested. Figured you might want some quality time with Teddy and Delphi.”

Tony looked like Harry had short-circuited his brain. “You—wait, you’re asking me to babysit?”

Harry raised an eyebrow. “You’ve been calling them your grandkids since you found out about them. Now you get to live up to the title.”

Pepper, who had been watching the exchange with a growing smile, leaned toward Tony. “He has a point.”

Tony sputtered. “Yeah, but—wait. You actually trust me with them?”

Harry tilted his head. “Kinda the whole point of asking, isn’t it?”

Tony blinked a few times before grinning. “Alright, Evans. You got yourself a deal.”

Teddy, catching onto the conversation, gasped. “We get to have a grandpa day?!”

Harry chuckled. “That’s the idea.”

Delphine, not quite understanding but sensing the excitement, clapped her hands. “G’ampa!”

Tony clutched his chest dramatically. “I’m keeping her. She’s mine now.”

Teddy looked affronted and started climbing Tony.

Pepper rolled her eyes. “Absolutely not.”

Harry just smirked, watching as Tony leaned over and ruffled Teddy’s hair while pulling Delphine into his arms. 

Maybe—this whole ‘having a family’ thing wouldn’t be so bad after all.

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