AN: I had this idea days ago and decided to work on it. In this AU, Izuku and Katsuki are already in their quarter-life stage. Izuku is a villain and Katsuki is a hero. You can just go and read. I believe you guys can get my story so far. Please fave, follow, or review so I can get pumped! Love you guys

Days without clients were slow. Izuku Midoriya loathed those days. It was a good thing he was his own boss, so he had decided to bike back home.

He bathed under the afternoon sunset. There was a slight zephyr that calmed Izuku's nerves. He could already smell the warm summer. It was just around the corner. He could go to the beach with Kacchan, but given the amount of workload they had, it would take a blue moon for that to happen.

But then again, under a year, they had more than enough money to retire. And they were just under twenty-five years of age!

With just two full deals, Izuku was able to buy a decent two-story house for himself and Kacchan. With the money that Izuku earned alone, he probably had enough to own all of the hero agencies and companies in Japan. Add that with Katsuki's saved money, they could probably take over the world.

But it's not like they haven't done that already.

They've conquered both spectrums: the hero world and the villain underworld.

Speaking of heroes and villains—

His bike skidded to a stop as he passed a block with a crowd. He rolled his eyes. He didn't feel like working. Considering there was a gaggle of heroes already, he guessed he had to help whoever-the-fuck villain there.

"Recklessness leads you to that, villain," he mumbled.

He looked around to see if he had any infected buildings there. He like to call the buildings that he had installed a smart weapon "infected" because the nerd inside him was still up and running. He connected his phone to a Bluetooth sniper he had secretly installed in one of the buildings around.

Being the nerd he was he had engineered Bluetooth weapons, reserved for specific people. They had a long range of connection that extended to a 100-meter radius. Cameras were installed to the weapons, their footage fed to the connected device.

The feed showed him a bunch of heroes trying to subdue the villain. Said villain had a Radiation Quirk. He had a large build, almost seven-footer. He wore a gas mask and cargo shorts. Powerful, but dang, the villain was reckless for just making a scene there.

"Huh, radiation . . ."

He had his sniper locked in on a debuting support hero. She healed teammates in combat. She was even able to reduce the infection of the radiation. What a rare Quirk.

Izuku smiled innocently. "It would be a shame if a debuting hero would go down on her first fight. She won't be remembered at all—"

A myriad of blond, green, black, and red sped past him, leaving the faint smell of gunpowder that Izuku loved. Izuku, again, rolled his eyes. His plans were foiled by Kacchan.

For the third time this week.

How could he remain number one villain if number one hero kept on disrupting his work?

Fucking stupid contract.

"You bitch-ass villain better get ready to get your ass kicked!"

Ground Zero flung one of Izuku's inventions (reserved for Kacchan and Deku use only) towards the villain and hit him clean on the head. Izuku sighed and opened the notes in his phone. He pressed the third note.

"Radiation-absorbing device—Kacchan's use counter: three. And with that he owes me dinner in a five-star resto. Great. And of course, he'll pay everything, even the tip." He disconnected his phone from the sniper and just watched his man in action.

His headset vibrated. Kacchan was calling. Why would he even call for help when he had the situation under control? Still, Izuku rode his way to an alley and accepted the call. His built-in holographic visor (another one of Izuku's brilliant inventions) buzzed to life, showing him a feed of what Katsuki was seeing.

"Even with your fucking device, the villain won't back down. Is he one of your clients?"

"Nope. Not at all. The villain is probably debuting also."

"That explains his dumbness. Wait, 'also?'"

Izuku explained, "Yeah. There's a debuting hero there. She's a support hero. Duck."

Katsuki dodged the incoming car. With just a tiny glance, he saw a terrified family inside. He cursed mentally and blasted himself to the other side to catch the car. He grunted as his muscles strained to carry the car. The screams inside just made him want to lose his marbles.

Izuku giggled. "Ooh, I'd love to hear you grunt like that."

"F-fuck off." Once he found his balance, the car fell correctly, with the tires bouncing. The family exited and thanked the number one hero in awe. He told the family to proceed to safety. They blended with the crowd. Katsuki returned to Izuku. "It's not like I'm the one who's doing the grunting. I fuck you like ninety-percent of the time. You only fuck me when I have awful days."

"Don't dominants also grunt when they fuck their submissives?"

Katsuki paused and shrugged. "Fair point."

"Focus on the villain, Kacchan."

"Yeah, I know. I really wanna end things already. Howitzer?"

"Go ahead. I wanna go home already."

"Great. I love the shit out of you."

"Love you too."

Izuku climbed on his bike and ended the call. He heard the crowd shuffle away for protection from the incoming move. And just like those badass scenes from action movies, a blast lit up the sky behind Izuku, while he was happily whistling. He found a small mirror nearby and looked. He saw the villain shoot up to the sky like a rocket.

"That's my Kacchan."

This was the life. If only being the best villain gave him a life like this, he should've wanted it already when he was a kid! Fortunately, only a reality check was needed. He had to thank All Might. If the passed idol hadn't discouraged him, he'd probably be just thrown aside in the hero world and just live in an office somewhere, being just a commodity in the corporate world.

Combining All Might's discouragement and Izuku's delusion, he had the idea that he could be number one villain instead. Then he was there. He ruled the world of villains. And no-one even knew his real identity yet, other than Katsuki, the freaking number one hero!

If it weren't for their hidden relationship, Izuku would probably be sentenced to death already.

Katsuki caught him one day when he already making in the villain world. Izuku was known for selling important information about heroes to villains.

Izuku was silently working in his room in his new apartment. He just had a new client who wanted information on this hero named Uravity. Some of these villains can't even think for themselves. If they were able to hit her from long-range, she would be most likely dead.

"But if their stupid butts think that she'd have a weakness from up close, fine. It's not like I'm the one risking his life here." He had to determine where she lived also, which was not revealed to protect her. What a hassle. Don't they know how difficult it was to hack in a GPS system without raising a red flag?

As he was typing away, he heard constant sounds on the vent. No-one was supposed to know his location also, so it wrecked his nerves. He shuffled to the vent and pointed a pistol at it. He was trembling. He can't get caught when he was already causing a rift in the villain underworld!

He had to shut this person up, one way or another. Running away won't help.

He heard a hungry panting inside, which caused him to shake more. That smell was so familiar . . . He shook his head and asserted himself. "Whoever is there, show yourself! I'll—I'll kill you anyway!"

The vent flew to the opposite side because of a powerful punch, followed by a tiny explosion. The metal sizzled against his blanket. The heat caused a small part of the blanket to ignite. Izuku panicked and rushed to the fridge. He snatched a water bottle and poured its contents on the small fire. Good thing he was quick to react.

"Hey, what gives? I just bought this new blan—oomph!"

He was pinned to the bed, with his mouth covered by a gloved hand. He could still feel the heat from it. His eyes trailed to the figure on top of him. His eyes stung from nostalgia. Even when he was caught, he smiled. Ignoring the hand, he shot up and gave Katsuki a hug.

"Kacchan!" The emotions were ravaging inside him, so he let them loose. His salty tears poured on the other's costume. "I-I thought I'd never s-see you again!" His hands measured the person who was all-too-familiar to him. This time, he wasn't hugging someone just so he can drive a dagger on their spine.

It was real, this time.

"You're still fucking Deku with your shitty tears up to now, even if you're a villain."

The last word froze Izuku. How did Katsuki know he was a villain? The other explained that he had to do some complex research alone to find out who this uprising villain was. Izuku was scared. He didn't want to be caught!

"Listen, nerd." Katsuki pushed Izuku slightly; enough to have them face each other. Izuku's face was red and damp. Yuck. He threw his handkerchief on the cry-baby's face. Izuku thanked the hero. As much as the reunion was fun, he had to find a way to escape. Fortunately he didn't have to.

Katsuki continued, "I should be taking you up for custody right now, but I need help. Yours specifically."

Izuku could've chuckled if he wasn't drying his tears. "The Kacchan I know doesn't ask help."

"UA taught me a lot of things."

"Oh. Proceed then."

"Good." Katsuki handed him a picture of a prominent villain. He insisted his name be Warlock. He was known for his Voodoo Quirk. It was an amazing one. "I want you to help me beat this son-of-a-bitch's ass once and for all. Gather as much data as you can and provide me weak points on him.

Izuku raised his eyebrow. "Can't you just do your so-called complex research on him?"

Katsuki blushed. Izuku's eyes widened. Katsuki was blushing! He looked adorable when he wasn't trying to murder anyone. "I had to . . . stalk you when I connected the dots. My suspicions were correct." After just a second, his aggression returned. "And if you think you'd still be free if you don't help me, think again fucker!" Katsuki was just inches closer to Izuku. The smaller man waved him off.

"I don't plan on declining, Kacchan. I'll do anything for you."

It was just like their childhood. Kacchan's murderous face and Izuku's overly friendly smile, reserved only for each other. Lots of things have changed.

But in the midst of everything, they still showed each other their true and innermost natures.

And as much as Katsuki hated to admit it, he was as glad as Izuku that it stayed that way.

Katsuki's face softened. Damn, UA really taught him a lot. He scratched his nape. "And ah . . ."

Izuku chuckled. Katsuki didn't want to say it. "It's okay, Kacchan. You can stay in my place. You know, I could hire some villain goons to cross off the people who bombed your house." Izuku made an "X" shape on the air. Katsuki shook his head. Izuku frowned. How dare they destroy Kacchan's house.

"You've dedicated yourself in this villain gig."

Izuku smiled. "A hero's enemy is a villain. A villain's enemy is everything."

Katsuki studied the villains he had caught. It was true. Heroes always antagonized villains. Villains antagonized everything. He had to say that villains most of times had a good incentive, but lacked the proper circumstances to achieve their goal.

As for Izuku . . .

It was Katsuki's fault he was a rising star. If he hadn't bullied the kid, if he hadn't ridiculed Izuku's delusions . . .

Katsuki found himself agreeing to Izuku's offer to catch a movie. Izuku was living in a small apartment, so he had a tight enough space to place a television in front of the bed. "Wait here." Izuku proceeded to the living-dining room and grabbed nachos. "Spicy salsa with or without cheese?"

"Without."

Izuku returned with two bowls filled with nachos and salsa. He plopped down next to Katsuki and opened the downloaded videos on the television. "You're probably tired of hero movies already, right Kacchan?"

"They make feel like shitting bricks."

When Izuku scrolled down, he saw the titles of the movies Katsuki were in. Izuku panicked and almost destroyed the up button. The hero stopped the villain from pressing. He asked, "You watch my movies?" Izuku bit his lip in shame.

"Ah . . . I'm a big fan of your movies."

"You should know, of all people, I'd hate acting for a movie."

"Yeah, but!" Izuku shot up, but still calmed down. He wrapped his knees with his hands. "I thought that I would never see you again, so the least I could do is watch your movies. I mean . . ." Izuku chuckled. "The plots of your movies are probably at the bottom of the barrel—"

"True."

"But I still watch them because it's you, Kacchan."

Even with all this villain crap going on, Izuku was still damn Izuku. Always made a way to be Katsuki's number one fan.

They eventually decided to watch a slice-of-life movie. Of course, Katsuki was bored as hell. He slouched while they both wolfed down on the nachos. Katsuki considered the spicy salsa to be mild. To Izuku, it was like the end of the world. Katsuki had to fetch Izuku water for about fifteen times halfway through the movie.

"If you can't handle the salsa, why don't you stop?" Katsuki asked as he munched down on another nacho. Izuku played with a nacho bashfully.

"You know how you want something, but you have to accept that said something is both bad and good for you?"

Katsuki nodded then continued, "Then you wouldn't mind the bad things if you can get what you want? Yeah."

"That's why."

"Noble. Stupid, but noble."

Izuku nibbled on a nacho covered with the red dip.

"Kacchan?"

"Sure, dipshit."

Katsuki proceeded to get a glass of water for Izuku.

One thing led to another and they were there. Izuku would find the confidence to ask Katsuki out, to which Katsuki agreed. The hero would then accept the Deku's confession and proceeded to live a secret and complicated forbidden romance. They would soon rise to the top of their positions.

Izuku never expected anything.

And he was glad that he had not.

What could Katsuki do without Izuku's inventions?

He had avoided disgusting paparazzi by making a quick getaway and using a transporter, disguised cleverly as a watch. Two years ago, he had expressed his overwhelming annoyance to the media. It took Izuku about six months to take in lots of quantum physics and human anatomy and all that yiddi-yadda. He had teleported himself in front of their house. He exhaled his annoyance off and entered.

Izuku called from the living room while playing a video game on his console, "Is it the media again, Kacchan?" The sound effects of guns rang in Katsuki's ears. The kid never stopped being a shitty nerd. But hey, Kacchan wasn't complaining.

"They fucking piss me off."

"Everything pisses you off."

Katsuki trudged weakly to the couch and dropped next to where Izuku was sitting. He was so exhausted that he can't even process anything. He wanted to pass out. Or probably blow the nearest object his eyes set down upon. However, his evergreen love for Izuku prevents him from doing any lethal acts to the shitty green nerd.

He deserved a vacation. He didn't care if he had to spend half of his savings (he probably still had enough savings to satisfy him for two lifetimes if he had done so); he just needed a rest. He put his head down on Izuku's shoulder. Izuku knew where this was going.

"I need my Deku plushie."

Izuku grinned. "Which just landed me a free gelato next time we go out. Huzzah for Deku."

"Come here, stupid bitch."

Izuku made himself comfortable on Katsuki's lap. The taller adult squeezed the life out of Izuku, as the nerd continued playing his game. Izuku kept on screaming commands to his Computer teammates, to no avail. He kept on dropping the enemies one by one.

"You're so fucking precious when you get toxic in a game."

"I know I—hey! Why the—uuurgh—don't go there!"

Izuku finished the mission with a lower score than he had expected. He set his controller down on the table and rested his back on Katsuki, still leaving the game on.

"Your Deku plushie is tired. Have you even eaten yet, Kacchan?"

"Make me a sandwich."

"Thank God, you ask for a sandwich. I was too busy playing that I didn't get to cook dinner yet."

"Mhmm. Go, you shitty Deku, or I'll bust your ass with a Howitzer."

"You know, I like how your threats don't even sound as convincing as before." Izuku headed to the kitchen and covered a loaf with pimiento spreading and hot sauce. By now, it was a ritual to put hot sauce over every dish served to Katsuki. "Do you want me to heat it, Kacchan?"

"It's fine as it is."

"Okay then."

Izuku plopped another loaf and headed over to Katsuki. "Number one villain, Green Death, at your service, number one hero, Ground Zero. You know, you're basically a villain for keeping my identity a secret and living together with me."

"You're basically a hero by helping me out in a villain attack."

"Yeah, but some villains are my clients and I reveal to them personal info about everyone I want them to know."

"That makes me wonder," said Katsuki, while tearing off the bread crusts. "Has anyone ever asked you about my important info?"

"You're the number one hero, Kacchan."

"Right—and what did you say?" Izuku pinched a piece of the sandwich and threw the entire chunk in his mouth. His tongue had gotten used to spicy foods, ever since he started living with Katsuki. It would be considered a weird day if he didn't even have any spiciness on his tongue.

"I usually mislead them. If I were to reveal your location, I would lie and lead them to one of my infected locations. Then I blast the shit out of them, with my Bluetooth turret guns." Izuku made an exploding gesture with his hands, while Katsuki watched intently. "Then I'd hire a clean-up crew. They're so gullible."

"My murder aura is starting to rub on you."

Izuku pouted. "It's your fault! I had to spend Kinder to middle school, listening to you always wanting to kill me. And now we're under one roof, so of course you're gonna start influencing me." Izuku poked Katsuki's cheek. "You're bad, Kacchan."

Izuku smiled as Katsuki met his eyes. They exchanged a dreamy stare to each other. Even when they shared the love a married couple had their relationship, Izuku still found himself blushing. Everything was like a surprise to Izuku. Katsuki was there. He made Izuku's heart beat like there were no tomorrow.

"You know, since day one, you were already an amazing criminal, Deku."

"Of course, I—"

"I mean, you stole my heart."

Izuku turned redder than Red Riot. He tried to shake his bashfulness away. He mentally beat his chest with his imaginary fist to boost his confidence. If Katsuki were throwing these lines, then that meant he wanted his Deku. He put his body on top of Katsuki's and they fell slowly on the couch. "I hate your cheesy pick-up lines so much. That was so boring."

"Yeah, but I still made you feel like you won the lottery."

"I make the same amount of money the lottery promises in two deals with my clients."

"Shut the fuck up."

Two pairs of lips were gently placed together, like the fitting pieces in a puzzle. Of course, both of their breaths smelled horrible. Spicy cheese intermingled with katsudon. But who gave a shit? Their tongues fought for dominance, until Izuku decided to take his usual role and allowed Katsuki to probe his mouth. And for everything that was holy, Izuku would never get tired of handing over his control to Katsuki so that his pleasure levels would destroy the roof. His eyes seemed as heavy as anvils when pleasure tingled in his entire being.

He let Kacchan wash over him. Kacchan was his weakness—but he was invincible with him.