A/N:

Brace yourselves, nerd talk is coming.

Chapter 11

Nezu sat on his office chair looking through the window with a small frown marring his face. His tea was half left and cold. His paws moved nervously on his lap.

League of Villains. That was the name of the group that attacked class 1-A during their rescue exercise on Tuesday. All their forces were nothing more than a common thugs with small criminal record. Cannon folders, his mind supplied. To take care of a students and slow Aizawa and Thirteen down. Most of them just did it for a promised money. Good money.

Their 'leader' sounded like a child stuck inside adult's body. Whining, screaming, laughing, destroying. From what he gathered he had some impressive skills and was rather perceptive. His quirk was very destructive, most likely it was the one to turn U.A. barrier into dust. But the most disturbing thing about him was that it all seemed to be a game to him.

Then there was Nomu. The beast gave Nezu chills. Their still waited for a results to be come back from the laboratory, but they already had their assumptions about a giant monster. No one like those.

To sum it up. Organization with access to sizeable amount of resources, 'lead' by a man child, that can produce a monstrosities with multiple quirks. And on top of it man with a warping quirk. Nezu's frown deepened.

For now the League was small, disorganized and had unsuitable 'leader'. For now. If somehow they changed that conditions, they could become a serious threat for their society. And if his guess about a linchpin was correct… Nezu didn't like the situation that could develop.

On the plus side were few things. 1-A came out relatively unharmed. At least physically. He should get Hound Dog to visit those kids and check on their mental health. Kurogiri's energy signature was registered, thanks to young Yaoyorozu taking down a villain with a jamming quirk, and the device that young Midoriya and Hatsume had built was fully functioning right now, so next time he tries to open a portal within the school vicinity, they will know.

A ping from his computer pulled him out of his musing. It was a mail from a genius boy, most likely sent by Alan. He opened it and couldn't help himself, but let excitement bubble inside of him. He grabbed a special pre-prepared forms from his drawer and begun checking them once more. He felt like he'd need them today.

Momo looked around, her sit at the back of the room gave her a perfect spot to observe her classmates. They were all tense, but kept themselves together quite well. She should help them, but didn't know exactly how to. Maybe talking would do the trick or some kind of out-of-school group activity? They're busy with their studies and the Sport Festival in a month would make their schedules even more packed, but it was possible to squeeze a class meeting somewhere. She wanted to help them, just like Midoriya and Mei helped her.

Remembering yesterday put a smile on her face. Like promised, she showed up in their new lab, ready to work on creating a perfect workplace for the baby making duo. At first they cleaned up all of the surfaces, furniture and workbenches. It was her first time doing a heavy cleanup. She had maids for it, who always tidied her room, when she was away. Despite it being a tiring activity, she found herself somehow enjoying a sense of accomplishment of getting a job done with her own hands. She should ask maids to stop cleaning her room.

After that she and Mei went to the nearby shop with paining articles, while Midoriya prepared a room for decorating. They decided to change the old and greyed out dull blue color to something more welcoming and bright. Midoriya's only request was 'Please, not a pink.', which caused her to giggle. After checking a bunch of pallets they settled on a nice shade of yellow, that looked similar to Mei's beautiful eye color.

Coming back with supplies and grabbing an early lunch, they begun work. Then the hell broke out. It all started with Mei 'accidently' touching her brush to Midoriya's nose. He returned a favor with a quick stroke on her arm. The small contest begun between them and when she tried to stop them, they just looked at her with wide grins and mischief in their eyes. They literally jumped at her with their brushes and started changing her into a piece of modern art. She found herself returning a favor. It turned into all-out-everyone-at-everyone paint war. They ended up with more color on them than on the walls, which caused them to fall on the ground and laugh for whatever silly reason they'd found in it. Thanks God that school had showers in the lockers.

After that they started bringing necessary equipment along with stocking the shelves and racks up. When Mei mentioned a bean bag, she and Midoriya did a quick trip to furniture's shop at the mall, while pink inventor stayed back to fix their 3D printers. They ended up buying three of them: green, orange and red. When she asked about a third one, genius inventor just said 'For you, when you visit us'. The thought made her smile. Of course she would do it.

The commotion in the exit of her classroom pulled her out of her bubble. She had missed a bell. Momo stepped closer and saw a herd of students blocking their way and declaring a 'war' on them during the Sport Festival. All thanks to Bakugo and his short temper. She shook her head at the blonde behavior.

"I'm sorry for my classmate's crude words towards you." she said, bowing to the crowd.

A boy with wild purple mane and very deep, black bags under his eyes seemed to be shocked by her actions. "It's fine." he mumbled and started walking away, taking others with him.

She sighted and ignored the thanks her class gave her. She was grateful, but she needed to straighten something out.

"Bakugo-san." she called, stopping blond and gaining his angry look directed at her. She didn't back down at his gaze. "I'm asking you to stop using that coarse language whenever you're speaking towards your schoolmates. It's compulsive and…"

"You think I fucking care about it?" he cut her out with a sneer. "I don't have a time for a small fries like you or them, you damn extra."

He started walking away, leaving her bewilderment at his words. Did he thought that he's some kind of a king of the whole word? His ego bugged her before, but now it'd become a real nuisance. He really knew how to bring someone's ire.

Before she could say anything more, a familiar mop of green hair and freckled face with smile showed up in the door.

"Deku…" Bakugo hissed, taking a position ready to attack, explosions popping on his palms. "The fuck do you think you're doing here?! It's not a place for a shitty nerds like you."

Midoriya took a step back, changing his posture to more closed one. He was looking at Bakugo's form with slightly narrowed eyes.

'Deku'? How could someone call the other human being with that kind of moniker? Especially Midoriya, who in her mind was anything but useless. This caused even more anger to boil inside her. Enough was enough.

"Just coming to visit someone. You know, support business." her friend answered in cold, indifferent voice, that absolutely didn't suit a person like him.

Bakugo eyed him for a second, before huffing and walking out of the class, hitting Midoriya with his shoulder. She watched his eyes following after blonde. Moment later he released his breath and mumbled something under his nose. He turned to her with his usual small, soft smile.

"Hey, Yaomomo."

She blinked at him and forced her mind to stop all question swarming in her head. She'd ask him later about it, somewhere more private than the classroom. Putting a little smile on her lips, she turned towards her friend. "Hello, Midoriya. What do I owe a pleasure of having you here?"

"Tell me, Yaomomo, are you free right now?" his eyes shone with excitement.

Momo ignored gossipers gasps and comments about a supposed date. "Yes."

"Great! Would you like to come with me to the Supprt Department Testing Side? I'm going to activate Arc Reactor today." he grinned widely.

So that was a reason. She wouldn't lie, she was pretty interested in that device. Not just because it seemed as something important to Midoriya, but because of her own human curiosity.

"Wow, you're gonna turn on that reactor thingy?" Ashido-san said, stepping toward them with her usual excitement.

"Is it some kind of a science project?" asked Kaminari-san, who looked over pink girl shoulder.

"Hey, can we come?" Uraraka-san bounced on her feet, she looked similar to the child asking parents for something.

"Why not." Midoriya turned towards almost whole 1-A "If you guys want to see a really cool 'science project' then you're welcome to go with me to support building."

Murmurs raised and she was her classmates questioning one another about it. It ended up with almost everyone following her and Midoriya towards the Testing Side.

That was it. It was the most important moment in his life. The state of his mind and dream depended on whatever his theory behind the Arc Reactor functioning was correct or no. He never was so nervous is his entire life.

Having a public in form of Mei, Yaomomo, principal, Power Loader and bigger chunk of 1-A both helped and not.

Izuku gulped and looked through the reinforced window of Control Room at the Testing Room. It was fairly big, but the only thing stationed there were his Arc Reactor, laying on the simple table, connected to transformer, which would supply electricity to jump start the whole thing, and one super capacitor to gather energy produced by device.

He took a deep breath. It was show time.

"Alan, are we ready to begin?" Izuku asked, hovering his hand over the keyboard.

"Yes, sir. We're good to go." came A.I. voice through the room's speakers.

He heard whispers behind him, but ignored them. This was more important.

He typed the command and soon on the screen he saw the visualization of the process. He observed the electricity flowing from transformer to the Reactor, but nothing happened with the device. He touched the winder and turned it slowly, monitoring the increase of the voltage.

When a soft whine came from behind a glass, his breathing stopped and eyes snapped to the device. He saw it, a soft white-blue light emitting from the Reactor. Just like in the comics. Just like in the movies. Just like he theorized. He waited a solid few moments, to confirm, that we wasn't seeing things. It seemed so unreal.

"Alan… My eyes are occupied… Please tell me it works."

"Congratulations, sir. The Arc Reactor test ended up in success. The device is fully functional." A.I. happily replied.

Izuku clasped a hand over his mouth and took a step back. His legs were like a jelly and soon he'd fallen on his back. He saw concerned faces of Mei and Yaomomo hovering over him and asking him something, but he didn't react. His brain was busy with processing the information.

"It works." he whispered. It didn't feel real. Chuckle escaped his mouth. "It works!" Chuckle turned into full blown laughter of happiness. He conquered another mountain and was a step closer toward his dream.

With a help of his friends, he stood up and glanced at the screen. All parameters where in the green zone and energy output was about the level he calculated so many times over and over again.

He heard applause behind him and turned towards his audience. They were clapping and cheering at him. He allowed himself to bask in it. He deserved it, over eight years of studying, brainstorming, theorizing mixed up with many sleepless nights were poured into this exact moment.

"So… how does it works?" came the question from a tall redhead with sharp teeth.

"Yes, I'd also like to know how does it function, young Midoriya. You only told me what it would do." Principal stated.

He saw everyone looking at him expectantly, Mei was even bouncing next to Yaomomo, who had a hard time not joining her. Well… it was time for a nerd talk, as Stan called it.

Izuku licked his lips and breath deeply. "The idea for it came partly form old project that would use a hot fusion, Tokomak. The biggest differences here are 'fuel' and what it's generating. The Tokomak mashed two isotopes of hydrogen at the high velocity, thanks to the powerful magnetic field, to create a helium and neutron, which are lighter. The missing mass produces the heat energy which is in turn used to power the turbine and change that energy into electricity. This is where second difference comes into play. Arc Reactor generates pure electricity and a little bit of heat. The 'fuel' here are two isotopes of palladium: Pd-103 and Pd-107. Whole device functions thanks to the material interesting capture and decay properties. Pd-103 produces rhodium 103 via electron capture, and during that it produces a neutron and gamma ray. Pd-107 changes into silver 107 due to the beta decay and when that happens it releases an electron. Rhodium and silver have different number of protons from palladium and due to the production-consumption of the electrons to balance out the proton count so there is no net flow of electricity. This is how the electric circuits between two radioactive isotopes is established. By using the external power source, Pd-103 is ionized be an electric arc and accelerated to high velocity in the outer ring. Pd-107 in the inner core starts to emit high-energy electrons as it decays to Ag-107. Those electrons escape to the outer ring and their flow is directed by magnetic fields there. Lack of electrons create a net positive charge in the core, which slows further emission until electrons can be replenished. In the outer ring, the free electrons collide with Pd-103+ ions, which causes electron capture and gamma ray emission. Those rays are then deflected inward towards the core, producing further electron emission and thus creating a self-sustaining reaction. The electron flow from the inner core to the outer one creates an electric potential difference. Giving it the power output, it creates the current, which relieves the electrostatic charge accumulations that initially slowed the reactions. So the less energy is drawn out, the slower is the radioactive decay and vice-versa. When palladium converts to Rh-103 and Ag-107 the reactions runs out of power. The glow that the device is emitting is due to the Cherenkov radiation. I occurs when an energetic particle enters a medium, such as air, at near the light speed in it. To put it in the simple terms it's just a very fancy cold fusion."

Izuku gazed at the audience and saw their stunned expressions. 1-A had their jaws on the floor and someone whispered 'simple my ass'. Most of them looked like they had learned more about physics in the last five minutes than in their entire lives He thought that he saw a steam rising up from a few heads. He heard principal maniac laughter and witnessed him ripping apart a piece of paper and throwing it in the air, it was his IQ test. Power Loader just stood there like a stone figure and mumbled under his nose. Yaomomo's eyes shone with admiration, she was really impressed. And Mei…

She terrified him. Honestly she gave him chills and caused his danger instinct to flee. Her face all red and sweaty with pure ecstasy, dreamy, half-lidded eyes looking right into his soul, her whole body squirming. She was panting like a wild animal, ready to pounce on its prey. Did she… No, Izuku didn't want to know.

Nezu, after collecting himself, stepped forward and presented him with a stack of papers and pen. "Just like we agreed, young Midoriya."

He took them and started looking through documents. When he confirmed that everything was like it should be, not that he believed the principal would lie to him, he signed it and gave back.

"Principal, if I may?" Yaomomo asked, gaining a nod. "What was that?"

Nezu chuckled at the innocence question. "Let's just say that from today the school and young Midoriya are a kind of the business partners."

"Partners?" Hagakure-san asked.

"Yup." Izuku answered happily. "I'm granting permission to use my design to build a big Arc Reactor, that'll provide power to the whole school. The access energy will be sold to the city grid and a part of the profit will come to me."

"How much are we speaking of?" questioned a boy with glasses.

"A lot." Izuku simply stated. "I need those money to continue my work. Well… our work I suppose, right Mei?" he looked at his parner and was immediately caught in the bear hug by her.

"Midoriya" Yaomomo started, getting his attention. "You've said that it produces electricity and heat, right? These it meant that the Reactor produces clean energy? And what is the output?" her voice was laced with disbelief. He couldn't really blame her.

This caused him to smirk, Yaomomo was as always sharp. "Yes, it is clean. The radiation it produces is mostly used by the device to run itself and rest is negligible. As for the output… at max it can produce the three hundred mega joules per second."

"I guess it's a lot, right?" blond with black lighting asked.

Izuku chuckled. "It's nearly two times more than the least powerful nuclear plant in the USA."

"How can you give an output to such high energy with those small cables?" Power Loader questioned, looking through the window.

He was right normal cables wouldn't be able to carry that amount of electricity, they'd vaporize instantly. "I've used a special industrial power lines. They can hold up to three times this Reactor is giving out. They're relatively cheap." And all thanks to the wonderful quirks.

"Well… it's good thing that it didn't explode like you've said it could." Jiro-san stated bluntly, making all males from 1-A and Power Loader look at him with a shock.

"It could blow up?!" guy with purple balls on his head screamed fearfully.

"Yeah, Midoriya said that it was a possibility. At best it'd cause a blackout. At worse…" Uraraka-san started with weird kind of cheerfulness in her voice.

"It'd kill us all." Jiro-san ended with deadpanned tone.

Absolute, eerie silence flowed through the room, until…

"I BLAME YOU FOR THAT! YOU'RE CORRUPTING HIM!" Power Loader shouted, pointing his finger at the obvious Mei.

She was too caught up in the thought of having funds for producing their adorable babies.

After a round of congratulations and questions from 1-A about their support assistance, which made him and Mei ecstatic, they along with Yaomomo, principal and Power Loader have left the room. Yaomomo was a bit sad at that, she wanted to stay and hung out, but something important came out. He just waved her concern, he was happy that she was here to witness the start of his hero path.

Mei kept looking through the window at that amazing baby. She should feel jealous, because it wasn't her marvelous baby. Instead she felt happy for her partner, that he accomplished something so great. Besides she knew that she wouldn't be able to come up with it. That kind of baby wasn't in her spectrum of expertise. She was more into babies that used energy. Suddenly an idea struck her.

"Hey, Izuku?" she started, turning towards the boy with her lips stretched into her usual Cheshire cat grin. "We should celebrate it!"

He blinked, still looking at the monitors, and smiled softly. "Yeah, sure. We could get some drinks and food to do it in the lab."

"No, no. I mean go out tomorrow and do something fun" she clarified.

She observed him stopping checking the screens and turning fully to her. His mouth opening and closing a few times. What? Did she said something wrong?

"You mean just the two of us?" he asked, making her nod. "Like… like a date?"

Why did he sound so shocked? Oh, there was that awesome, funny feeling in her stomach yet again, more powerful than always. "Yeah, sure. Like a date. So you wanna?" she jumped up and down. Oh, she was so excited right now.

"Yeah… I-I would love to… I'm going to get the Reactor back."

He hastily walked out with a slightly red face. Was it something she said?

A ping pulled her out of her musing. On the screen was a message from Alan. 'Put the earpiece on.'. She complied.

"Mei, from the experience I know that it's best to just simply say things to you, so allow me to ask. Do you know what a date is?"

She blinked and shrugged at it. "Some kind of meeting, I guess." she really didn't know.

"Yes, partly you're right. But it's a special kind of meeting."

She tilted her head at that. "Like a business meeting?"

A.I. gave out a sound that was similar to sigh. "No. It's for people that are interested in each other."

Mei quirked her brow at that. She was interested in Izuku and them making babies together. Did that count?

"Romantically interested." Alan added, like he could hear her thoughts.

"Romantically?" she should know that word, she was sure of it.

"Perhaps that way we can get some results… I'm going to ask you a few questions. Firstly, what do you think of Izuku?"

"He's super smart and funny. He understands me. Oh he loves to make babies. Oh and…"

"That's enough. Next, do you like spending time with him?"

"Of course! Why would I like it?" The very idea of not spending time with Izuku seemed so ridiculous to her.

A.I. chuckled at that. "Okay, last one. Do you experience something different from normal whenever you're near him or talk to him and so on?"

She smiled brightly at that. "Yes! I've got that funny feeling in my stomach and sometimes my heart beats faster. Oh and my face is hot."

"Congratulations for your self-awareness, Mei. You're romantically interested in Izuku. Or speaking in simpler term, you're in love."

Mei paused. Literally and of her body and brain functions stopped for a second or two. After her mind rebooted itself, she suddenly understood. Her parents talked about it to her. Her older brother did the same. Some of her aunts too.

Love. She, Mei Hatsume, the wonderful inventor, was in love. Not with her beautiful babies. But in another human being. She was in love. With Izuku. In love… Her cheeks heated up and the feeling grew stronger. Her heart started beating so fast, that she thought it's going to explode. In her current state, she commented it in the most intelligent way she could of.

"Oh…"

"Oh, indeed." came the response from sassy A.I.

A/N:

There you have it guys. Arc Reactor is up and running. So for a little bit of explanation. I'm a science guy and like to think of how the stuff works. So thanks to my glorious insomnia, I've spent some time reading through the articles about palladium and cold fusion, and ended up with something akin to what I presented to you. I've found a discussion on quora's side (I'm not sure if I can link it or no, so if someone knows, please tell me) that further refined my theory.

As for why I've lowered the Reactor power output… TONY IS WRONG! 3GJ of energy is insanely huge amount for something that small. Even those 300MJ, that I've given Izuku, feel like it's too much. Trust me, I'm a certified technician electrician and I know just how absurdly amount of energy that is.

Those 'special cables' are a pure fantasy. If there's someone like Eri with her powers to literally turn back someone's state of being, than surely there's someone with a quirk that would allow them to produce some kind of material sufficient enough to run that kind of power.

Oh and HolyKnight5, you're right on your money with what I was going to do with Arc Reactor. And it was thanks to you, that Mei had her little moment. So have a cookie, you deserve it.

Anyway, now it's time to Mark I to be build, which is going to be a Tony's Mark II.

Next chapter is a baby making duo date. I think it'll be written using Mei's perspective to make things funnier.

Hope you all are enjoying the story so far.