Edit: I changed the first chapter because I wasn't happy with it. I added a new scene at the beginning. Please read the chapter again if you only read the first version.

A/N: So... I wanted an One Piece fic in the Boku no Hero Academia universe, and this happened. I have a plot sort of figured out, but feel free to leave suggestions! I have no idea of what I'm doing anyway.

This will be a LawLu but with Law's age closer to Luffy's. Also Jinbe is part of the strawhat squad in this (hurry up Oda, I want to see him with the crew already!).

Enjoy and let me know what you think!

For the eighth time that day, Law sighed.

He was in Doflamingo's house, again. The dark haired boy was so frustrated - he and Cora-san were so close to exposing their boss for the sick, disgusting, torturer that he was. But now Doflamingo gave a new mission to Law, and he couldn't refuse without raising suspicion.

Well, at least Cora-san wasn't required to be part of it. Law felt better knowing his adoptive father was probably safe in their home.

Law and Rosinante had been with Doflamingo as long as the tall boy could remember. Doflamingo was a pro hero, known for his contributions to the police and for how generous and kind he was, specially with children. Which is how Law ended up in his care when he was young, sick, and without any family. At first, the tall blond man had taken care of him and introduced him to the other children in his care, Baby 5 and Buffalo. He gave him shelter and food and clothes.

But soon the kind hero revealed his true intentions; he acted as a double agent, having a huge network of villains working under or with him. He only took Law in because he wanted another pawn in his sick game.

Truth be told, at first Trafalgar didn't care. His family was dead and he had nowhere to go. He was sick with the same disease that killed his parents and sibling, and in a matter of weeks or maybe even days he'd be dead. He didn't even manifest his quirk yet. Nothing really mattered.

But Corazon, Doflamingo's brother, tried really hard to save Law. He visited doctors and witches and tried alternative medicine. He never gave up on Law, and in return, the boy also tried to look positive, at least until he died.

Except that he didn't die. His quirk manifested, and it was amazing and everything they could have asked for and he could remove the sickness from his body with it. And then he'd be free and able to have a good life.

However, Doflamingo also found out about Law's quirk. And it worked perfectly for him, because he really needed someone with a medicinal quirk to help with the experiments he had been conducting - his partner Kaidou the Beast, wanted a way to reproduce quirks and give them to people, and for that to be accomplished, they needed a lot of subjects and scientists. And someone who was able to keep the subjects alive.

The Joker soon arranged so Law could study medicine in order to work under him. Cora-san convinced his brother that it would be best if Law had a hero education as well, and at least Law was able to go to school and have some sort of normal upbringing.

Rosinante and Law couldn't escape Doflamingo. They knew the older man would find them, regardless of where they went. Which is why they needed to gather enough evidence that the Joker was a criminal. And they were almost there - they just needed someone to testify against him. Someone that would be brave and strong enough to stand up against Doflamingo.

But they couldn't do it fast enough, and now their boss started a new mission. Apparently they were seeking people with a powerful quirks so they could copy it and give it to Kaidou's followers. Law and Rosinante had to stop it from happening, because they knew that if Kaidou had an army of people with Logia quirks they would surely destroy the peace that Whitebeard and the other pro heroes fought so much to conquer.

Law waited in the room. Any minute now Monet and the rest would leave to try to capture a pro hero, one that had a strong fire quirk. He hoped something would go wrong with their plan.

Ace was pissed. First he got up late to work, earning a lecture from Marco. Then Sabo kept sending memes in his emergency number, making him check his phone all the time in an important meeting, which made Pops glare at him for the rest of the day. Now that he was finally home, Luffy had been complaining about dinner being late for over thirty minutes. His head hurt.

"Why don't you cook dinner if you're so displeased with us?" the freckled boy complained. Sabo made a disgusted face at that.

"Please don't. I still haven't recovered from the last time he made lunch for us," the blond boy said. Ace had to agree.

"You're exaggerating! Brook said it was good!" replied Luffy, offended.

"Yeah, because he's a skeleton and probably doesn't even have taste buds. You didn't even eat that stuff you made! I'm not trying anything you make unless you eat it first," Ace said, while he cut some carrots. He was helping Sabo make some pasta with meat and vegetables. emLu needs to have a more balanced diet,/em Sabo had mentioned.

The three of them lived together in an apartment next to UA. Ace and Sabo, both 18, had already graduated and now acted as sidekicks for some important pro heroes. Ace had interned with Whitebeard when he was in hero school and, although he complained everyday about the guy and his insane office, deep down he loved working there. He may act tough and independent, but he had to admit that working with people who considered each other family and who were always supportive helped Ace with his self esteem a lot. He was very grateful for the number 1 hero.

Sabo, on the other hand, had interned at several different hero offices while in school. That helped him with learning how to adapt and deal with different people, which made Dragon, the leader of an underground hero organization focused on infiltrating villain groups, interested in him. Similar to Ace, the blond also found a family with those people. Ace could tell that Sabo acted weird when he didn't see Koala's pissed off face and Hack's calm one every day.

The brothers were not blood related, but everybody thought Ace and Sabo were because of their identical quirks - Hellflame, the power of generating and manipulating fire at will. Such a powerful quirk, combined with rigorous training, earned the two the title of The Big Three along with Eustass Kid when they were in high school. The three fought a lot but never agreed on who was the strongest.

Ace met Sabo when they were 10, and later the two of them met Luffy. Luffy was often alone at home because Garp was always busy and Sabo hated being with his rich conservative parents, so both of them often hang out at Ace and Dandan's place. So often that Dandan often joked that they should pay rent too. Now, at 18, Ace and Sabo finally earned enough to be able to pay for their own apartment. They both agreed to live together and pay for Luffy's share too - they have been together since they were kids and nothing would separate Ace from his true family, although he would never admit his fondness out loud.

"Sabo, stop staring at Koala's picture and hurry up! I'm starving," Ace complained. The blond snapped out of his thoughts and turned off his phone, glaring at Ace.

"Alright, we just need to cook the vegetables and we're done," he said. Luffy grinned at hearing that.

"Hell yeah! Damn, I'm so hungry. Sanji didn't let me eat the cake he brought today," the younger boy pouted.

"Sanji? What was he doing at Rayleigh's office?" asked Ace, confused.

"Oh, I went to Franky's place today. Rayleigh had an interview or whatever. Franky made this super cool robot that's supposed to help the police with identifying when a villain is lying! I tried lying to it but it saw through me every time. Although it got a bit confused when Usopp tried. And then we watched the new Star Wars movie but Zoro fell asleep so we doodled on his face and-" a knock on the door interrupted Luffy's rambling.

"Uh, are we expecting anyone? I didn't exactly make a fancy dinner to guests."

"Not that I know. Let me see who it is," replied Ace, already getting up from his seat.

Ace had barely opened the door when a tall man with short hair and weird beard entered the apartment; he wore sunglasses, even though it was night. Ace immediately recognized him as Vergo, one of the top police officers in Japan - he was famous for being as strong as a top hero. Along with him, there was a woman with long dark hair and pale skin, wearing a maid outfit and white laced headband. Ace didn't recognize her.

"Officer Vergo! What can we do for you tonight?" asked Sabo, who looked as surprised as Ace felt. Sure, they are sidekicks in extremely important offices, but they are still fairly new in the hero business and weren't used to important visitors like that. The only time a police officer visited them before was because Luffy saved a pink haired kid from a fat woman who apparently was a minor villain.

"Hero Fire Fist, hero Revolution. It's good to see you again. This is Baby 5, a sidekick of Doflamingo's." The woman made a polite bow that was returned by the three brothers. "We're here to ask some questions about the neighbourhood. There are reports of villain attacks against students in the area and the police is working with Doflamingo's office to understand the possible locations that may be compromised."

Ace quickly pulled a chair for the visitors while Sabo finished the dinner. He glanced at Luffy; the younger boy seemed excited that something was happening.

"So, attacks against students, huh? Any idea of who's behind that?" asked Ace, curious. He had heard some rumors at work but didn't really feel scared about it; every newbie villain tried to attack students in order to ruin the hero schools' reputation and make it to the news. It wasn't exactly an original tactic.

"Apparently it's a villain that goes by Joker. His attacks seemed to be focusing on especifically Logia types. Several reports mention they're kidnapping heroes and students with more flashy quirks," Vergo replied.

"Actually, if you do not mind, we'd like to ask the both of you to help with area recognition. We heard that you two were quite… huh, familiar with this neighbourhood", said Baby 5. Ace blushed at that. He and Sabo would sometimes ditch class to try to catch minor villains. They were great at finding shortcuts and places to hide near UA. Their fame apparently had reached the higher ranks. Sabo also looked a bit embarassed.

"Uh, yeah. Would you like to go now? It's not too late to see some places, although I believe it's better to see the more dangerous areas tomorrow," replied Sabo.

"That would be great. Thank you for your cooperation," replied Vergo, already leaving the room.

Luffy was also getting up from his chair. Ace would have suspected the boy was so excited he had forgotten about dinner if his stomach had not decided to growl loudly at that instant. The older brother stopped Luffy from following them. "Where do you think you're going? You're not a hero yet. This is between the grown ups," he said teasingly. The younger boy pouted.

"Stupid Ace! I can go, right Sabo?"

Sabo smiled. "Sorry, Lu. I'll make you dessert, okay? Just enjoy dinner while we're out."

"It's okay. Your brother is a student at UA, right? Maybe he can help us too," said Baby 5, with a dismissive hand. Luffy grinned like Christmas had come earlier this year.

"Alright, alright. But you better behave," Ace sighed.

The brothers, the officer and the sidekick all left the building. The street was empty, except for some children playing soccer in the end of the street. The night was dark but the area had several lights, making it easy to see anybody moving from afar.

"So, there's an abandoned church next to this street that is often used as a villain meeting point. We used to hide there and wait for villains to show up to beat them," Sabo said. "It's not difficult to enter it during the night, there isn't many patrols in the area. People usually stay away from the place so the heroes only realized there was something wrong when the villains were already acting..."

They had been talking for about an hour when a loud explosion interrupted the conversation abruptly, throwing Sabo and Baby 5 to the left and the rest to the right. The blond turned around and saw a harpy-like woman, with green hair, white wings and colorful legs with claws. Next to her there was a fat guy with propellers for limbs, holding what looked like a bomb in his left hand. He threw the object towards the left side of the street, making Baby 5 and Sabo run even further from Ace, Luffy and Vergo.

"Monet, get the three in the right! Trebol and I will deal with those two!" screamed the large man. He flew in their direction and grabbed Sabo by the collar of his shirt. Baby 5 quickly turned one of her limbs into a gun, shooting repeatedly at the villain. The blond turned his entire body into fire, making the propeller man drop him in order to avoid getting burned. After hitting the floor, Sabo felt a substance similar to mucus covering his left arm and gluing it to the ground, preventing him from getting up. He looked up and saw a man with a broad flat nose, long beard and wearing small sunglasses. Trebol, apparently. Sabo instantly turned his arm into fire in order to release himself, but that was the wrong choice - apparently the mucus was flammable, causing it to explode. The blond screamed as his arm burned from the explosion, but he finally was able to get up and run towards Baby 5, who was now cornered by the two villains. He quickly used his fire quirk to the maximum, throwing attacks at the two guys and trying to save the sidekick; they had no idea of what their goal was and Sabo also feared what the harpy could be doing to his brothers while he was wasting time with a villain with a disgusting quirk like the mucus one.

They stayed like that for a while; Baby 5 and Sabo shooting at the villains while they tried to trap one of the heroes and capture the other. Sabo got trapped in the mucus substance and had to endure the explosions three more times - Trebol seemed to purposefully be focusing on disabling him, hitting his legs.

Suddenly there was a scream, and Sabo noticed, scared, that the harpy had tried to hurt Luffy but Ace had protected him, earning a deep cut in his leg. He watched as Luffy attacked the green haired woman with his rubber pistol, screaming in frustation, while Vergo tried to knock her out.

"Monet, Buffalo, come back here! We can capture the blond one, he's weak now!" shouted the mucus guy. Sabo reinforced his attacks vigorously, glaring at the villains. So their plan was to capture one of them, huh? Kidnapping was a common practice in this line of work; the blond had heard stories of sidekicks being captured by leagues in order to obtain information about the bigger heroes. He supposed these guys wanted data about Whitebeard or Dragon, so capturing Ace or Sabo would make sense. Part of him feels flattered that he was becoming so important that he was targeted, but that wasn't the time to think about that.

He glanced at where his brothers and Vergo were; the harpy, Monet, had made a snow structure around the three males, trapping them, but Ace melted it away in the blink of an eye. Like Sabo, he also seemed to be reaching the limits of his power - Hellflame was a powerful quirk, but its biggest weakness was resistance; Sabo and Ace couldn't use it extensively or for too long without burning themselves eventually. Mixed with the explosions from Trebol's quirk, Sabo could already feel that his left arm was useless and the right one hurt like a bitch; not to mention it was getting harder to stand on his feet. The pain was blinding, making the blond stop sometimes to catch his breath.

The harpy flew towards them, a claw ready to incapacitate Sabo, but Ace stopped her mid air. The freckled boy seemed nervous now that he heard the villains' plan, he quickly ran towards Sabo and Baby 5, trying to prevent his blond brother from being captured.

Sabo and Ace immediately turned to opposite directions, back to back. The fat guy, Buffalo, tried to approach them, incredible speed with his propeller limbs, but Ace was prepared and made a wall of fire to prevent him from getting too close. The other villain, the harpy, tried to involve the both of them in a snow cage, but Sabo quickly melted it away. Frustrated, she flew towards them, a claw ready to cut Sabo's leg. The blond boy prepared a kick, but Monet turned around in the last second, hitting Ace instead. The dark haired boy let out a strangled cry as her claws cut deep his arm, while Sabo threw fire punches at her. Buffalo took advantage of the slip up and quickly separated the two of them, throwing Ace next to where Vergo and Trebol were fighting.

Sabo quickly tried to reunite with his brother, but hesitated as he saw Ace's eyes widen.

"GET LUFFY!" Ace screamed, his face pure terror. Sabo didn't even question it; if his brother wasn't bothering to hide his worry then Luffy must be seriously in danger. He turned around and watched, terrified, as Monet used her claws to get Luffy and quickly flew flew away from them, distancing herself from the others. The rubber boy threw a punch at her, making her drop him, but in an attempt to recover him she thrust her claws into his body, making Luffy cry out in pain.

Sabo threw several fire shots at the harpy, trying to make her go after him instead. Baby 5 also shoot at her, and Monet was now busy throwing snow attacks at the woman. Taking the opportunity, Sabo ran, ignoring the blood dripping from his arm from overusing his quirk. He tried not to let his mind jump to conclusions, everything would be fine, he would reach Luffy and his brother would be there waiting for him and Sabo would take him and Ace to a hospital and they would be fine.

Sabo heard a loud noise and, after looking up, he realized the fat guy was back, flying in the same direction as he was headed.

"No, no, no," Sabo muttered, desperate. He tried to run faster, tried to force his feet to barely touch the ground, tried to force his legs to work more, tried to ignore the pain in his lungs as he kept running towards his little brother. He was getting closer and now he could see Luffy on the ground, a pool of blood beneath him, and Sabo kept running, running, running. He was almost there. Almost.

Except the guy was much faster than he could possibly be, and he was much closer to Luffy than Sabo. His brother wasn't moving and Sabo felt the desperation reach panic levels, his entire body shaking as he ran. The blond watched as Luffy tried to get up, a huge wound on his stomach bleeding absurdly. The younger boy tried to move towards Sabo, looking disoriented and unaware of the villain about to reach him. Sabo prepared to throw a punch engulfed in fire towards the sky; he needed to take the guy down before he got to Luffy, but Buffalo seemed to understand what Sabo was going to do and tried to fly in random directions, trying to make it harder for the blond to hit him. Sabo lifted his arm up again, throwing fireballs at the villain, he was going to kill these assholes for hurting Ace and Luffy-

But the villain's limbs suddenly turned into even bigger propellers, his speed drastically improving, and he picked Luffy up like a ragdoll, then turned around and flew in the opposite direction, away from everybody else. Monet quickly made an snow prison around Baby 5 and followed Buffalo, carrying Trebol.

Just as fast as the whole thing began, it was over. Sabo watched, helpless, as they flew away with his brother, the noise of the propellers deafening.

Sabo barely noticed when he fell to his knees and puked on the street.

A/N: Poor Sabo.

Next chapter: Luffy and Law meet, although not in the best of conditions.