Symbiotic Relationship

When Izuku awoke his mind was consumed with pain. Every nerve in his abdomen was on fire like a million hot pokers were being jabbed into his stomach all at once.

"Venom?" Izuku whispered staring at the white ceiling as he slowly breathed. "What's going on?"

But all he got was silence.

"Your quirk is completely focused on healing you Tarantula so it probably won't respond." A tall man in a trench coat said from Izuku's right.

"Tsukauchi." Izuku said his voice tinged with pain. "It's been awhile."

Tsukauchi smiled down at Izuku. "It has." He said nodding as he sat down in a chair beside Izuku's bed. "How's my favorite vigilante doing?"

"Uh not very well seeing as I got a fist rammed through my stomach." Izuku said looking down at his blanket covered stomach.

The detective smiled grimly. "Yeah though your quirk managed to pull you back together and repaired your organs."

Izuku stared at the ceiling as he sighed. "Thank you Venom."

The door to the room opened with a click as someone entered the room.

"Young Midoriya." A tired and slightly familiar voice said from Izuku's right. "You did a good thing today."

Izuku turned his head to look at the voice's source. A tall blond man that was nearly skeletal gave him a small smile as he sat down on the bed beside Izuku's.

"From what I hear from Young Asui and Young Kaminari you constructed the plan that allowed you three to escape." The man said smiling at him. "You were truly a hero today young man."

Izuku smiled as he felt something wriggling in his chest. "That's... that's something I've always wanted to hear." He felt small tendrils emerge from his back. They forced him up into a sitting position despite that pain that crashed through his body as he moved. "Thank you whoever you are."

This made the man burst out laughing until he started coughing up blood. Beating his chest the man smiled at Izuku. "Heh I'm Yagi Toshinori All Might's secretary it's nice to meet you."

"Likewise Yagi-San."

Tsukauchi smiled at Yagi as he stood. "I'll leave you two alone." He said sighing. "I have to question the villains we've captured."

"Goodbye Tsukauchi." Yagi said looking at the detective as the tall man walked towards the door. "And good luck with the paperwork."

Tsukauchi visibly drooped as he reached the door. "Why did you have to remind me?" He asked with exaggerated misery making Yagi chuckle.

"I'm sorry but it was too good of an opportunity to miss." Yagi said chuckling as Tsukauchi left the room.

"Young man." Yagi said losing his happy tone. "May I ask you how you have a quirk?"

Izuku blinked. "W-What? I-I've always h-had a q-quirk what're y-you talking about?" He nervously stuttered as he looked at the man.

"Really?" Yagi asked with a arched blond brow. "Then why did Young Bakugou call you quirkless on the first day when we could all quite clearly see your quirk in action." He said making Izuku pale. "And why according to Eraserhead and your fellow students was there a villain that you fought that had a similar quirk to your own."

"I... I..." Izuku was at a loss for words.

"There are only two real options for how you suddenly have a quirk." Yagi grimly said making Izuku pale even further. "Either A you took a quirk enhancer, though what one I wouldn't know, and it somehow awoke a quirk from your heritage or B... you met with a villain known as All For One." Yagi said glaring at Izuku. An old rage burned in his sapphire blue eyes at the name. "And he gave you that quirk."

'A villain that can give quirks?' Izuku thought staring at the skeletal man. 'How is that possible?'

"Or C none of the above." Venom said creating a smaller than usual manifestation on Izuku's shoulder. "Little host allow me to tell the secretary how we came to be."

Izuku nodded at Venom while Yagi stared at the symbiote. "It's more secret to tell than mine Venom."

"I am a Klyntar or a Symbiote whichever you call me I am not of this world." Venom explained making Yagi's eyes widen in shock. "My species is old one of the oldest of this universe and we have the unique ability to bond ourselves to the races that fill the cosmos. When we bond to a host we give them greater power than they could have alone and we in exchange gain nutrients and knowledge."

"So... you're an alien." Yagi said in shock as he stared at Venom. Before he bursted out laughing stopping only when he began spitting blood. "Heh sorry it's just... it's comforting to learn that I was wrong." The man said giving the boy and his tenant a smile. "Sorry I accused you of that."

"It's fine." Izuku said holding up his hands. "I'd be suspicious too if some random quirkless gained a quirk out of nowhere."

Yagi sighed as he stood up. He gave Izuku thoughtful look. "I suppose so." He muttered before giving Izuku a small smile. "I'll leave you to heal goodbye Young Midoriya."

"Goodbye Yagi-San."

The second that Yagi left Izuku's mother, Inko,  bursted into the room. Tears ran down her face as she ran to hug Izuku.

"Oh my baby!" Inko cried pulling Izuku into a tight hug. She buried her face into his shoulder as she cried. "You.... you nearly died!"

"I... I know." Izuku said giving his mother a weak hug. He normally would have cried, but he was just too tired to.

Inko pulled back to look at Izuku. Her emerald eyes were bloodshot from her crying for who knows how long. "I don't know what I'd do if that happened." She said staring at Izuku. The woman was just barely able to stop herself from breaking into more crying as she continued. "You're all I have. Izuku." Inko stared into Izuku's eyes her own held determination fueled by anger. "Are you sure that you want this life, this career where at any moment a villain could take you away?"

Izuku sighed and nodded. "Yeah mom I'm sure. I've been sure ever since I was four." He gave her the best smile he could. "Being a hero is all I've ever wanted."

Inko sighed as she gave him a sad smile. "I guess I already knew your answer and I won't stop your dream." She said crossing her arms as she took a step back from Izuku she gave him a stern look. "But please, please try to keep yourself safe. I don't know what I'd do without you."

Izuku smiled at his mother. "Of course."

The next day classes were canceled. And Izuku spent a lot of that day laying in bed. His stomach may have been healed thanks to his tenant but it still hurt like hell.

That is until he got a phone call.

"Hello?" Izuku asked as he sat up.

"Hey Midori-Chan." Kuroyoku answered her smile evident in her voice. "Wanna grab a burger?"

"...uh okay... why?"

"I'm hungry, bored, and you sound like you need cheering up." Kuroyoku said making Izuku rub the back of his head.

"Yeah I guess." Izuku said looking down at his stomach. The once pale skin was now a mess of raw red skin and bumpy scar tissue. "Where do you want to meet up?"

"There's this American Wild West themed place not far from U.A. that I really like." The girl said sounding like she was getting hungrier with each word. "You can't miss it. Meet you there at eleven."

"Okay eleven it is."

Izuku stood in front of the restaurant Kuroyoku had mentioned and she was right you can't miss it. Especially with the giant sign that read "Wild, Wild Burgers."

"Yo Midori-Chan!" Kuroyoku yelled as she walked towards the boy. Her shadowy features shifted less in the broad daylight than the dark alleyway. The girl's gleaming silver eyes held a smile as she looked at Izuku. "Let's head in." She suggested pointing at the restaurant.

Izuku nodded and followed the girl into the building. The whole place had a strong scent of sizzling burger and steak. Everything in the place was plastered with Wild West themed stuff including the waitresses.

One waitress who seemed to recognize Kuroyoku came over to them.

"Hey Kuro!" The waitress excitedly said. Her long lizardlike tail brushing Izuku's legs as she stepped in front of him and Kuroyoku. "Same booth as always?"

"Yep." Kuroyoku said nodding. Small wisps of shadow escaping from her "hair" as she began to follow the waitress deeper into the restaurant.

Izuku quickly followed until the three came to a small two person booth in a mostly secluded part of the restaurant.

"I'll come back with your usual Kuro." The waitress said smiling at the shadow girl before she turned to Izuku. "I'm assuming you'll want a menu."

Izuku was about to speak before Kuroyoku interrupted him. "He'll have the same thing. My treat."

The waitress nodded before walking away. Presumably to the kitchen.

Izuku sat down in the booth and Kuroyoku quickly followed.

"Now then." Kuroyoku said resting her head on her hands. "Let's talk."

"About what?" Izuku asked crossing his arms as he arched a smooth green brow.

"Hmm how about how according to Scream you suddenly feel like you have two of these parasites inside of just one."

Izuku blinked as he ignored Venom's indignant screeching. "Oh. That." He said subconsciously laying a hand on his stomach. "We may have... met Phage yesterday."

"Phage?" Scream questioned forming a head from Kuroyoku's shirt. Izuku looked at the manifestation in surprise not knowing that symbiotes could mimic clothes.

"Yeah." Izuku said rubbing the back of his head. "And we may have sorta, kinda ate him."

"You ate my brother?"

"To be fair my progeny." Venom said forming a small manifestation on Izuku's neck. "Phage did try to eat us first."

Kuroyoku blinked as she looked down at Scream. "Hold on you have a brother?"

"I have many siblings." Scream simply said looking at it's host.

The shadowy girl shook her head and was about to speak. But stopped as the waitress from before sat down two large trays of food on their table.

"There you go!" The waitress said smiling at the two. "Two bison burgers, two jumbo servings of wild fries, and two chocolate Texan shakes. Enjoy you date Kuro."

Kuroyoku blushed as she glared at the waitress. "It's not like that!"

The waitress giggled as she started walking away. "Sure it isn't."

Izuku took a bite of his burger as Kuroyoku quietly fumed as she glared at the waitress' retreating form. He had to admit it was a tasty burger.

"Is there another reason that you asked me here besides your previous question?" Izuku asked once Kuroyoku seemed calm.

Kuroyoku nodded as she drank her milkshake despite her lack of a visible mouth. "Yeah... you're him right? The vigilante Venom?"

Izuku blinked as he nodded. "Yeah that's me... though most know me as Tarantula or Poison. But why do you want to know?"

"Nearly a year ago." Kuroyoku began. "You saved my big sis from this creep in a alley. I've always wanted to thank the guy who saved her, and now I have the chance."

"You don't have to thank me." Izuku said holding his hands up. "I was just doing what any hero would."

"Not really." The girl said pointing at him with a fry. "A hero like Endeavor or Captain Celebrity would have just left her to be raped and killed because no one was watching."

Izuku sighed because Kuroyoku had a point. Those heroes would have done just that because they don't care about people, they only cared about fame and glory.

Kagekatsu watched Midoriya as they walked together. He was a cute kid, and she definitely had a hard time believing that the hulking Venom was the same person as him. But that's just how symbiotes work completely altering how their hosts look. And how they think.

The girl shook her head slightly as Midoriya began to ramble about some new hero. Guy has apparently saved a whole building of people on his first day.

Whatever. He was probably in it for fame and fortune just like all the other posers.

Midoriya was the only person she knew that really embodied what it meant to be a hero. Saving people for no gain, sacrificing your own life for others, and doing the right thing no matter the cost. From what she could tell the kid did 'em and more.

'Do you think he'd be a good mate Kage?' Scream asked practically purring as Kagekatsu blushed. 'He certainly looks like he has the proper sized equipment.'

'What're you even talking about!?' Kagekatsu growled in her mind as she tried to hide the blush on her face. Which wasn't easy since the silver hue stood out like a sore thumb on her pitch black face.

'I mean have you seen his hands?' Scream said confusing Kagekatsu until the symbiote continued. 'He has man hands, hands that belong to a mate with a large-'

'Don't you dare finish that thought.'

'... all I'm saying is he's probably got a big dick.'

Kagekatsu rubbed her forehead. Thankful that Midoriya was so caught up in his rambling that he didn't notice. 'Scream I swear that I'll rip you out of my fucking brain.'

'You have a brain? And here I thought your only draw was a rockin' body.'

"You motherfucker." Kagekatsu growled making Midoriya look at her with surprise.

"Something wrong Kuroyoku?" Midoriya asked looking at her with a concerned face.

"Nah." She said shaking her head. "Scream is just being a little bitch."

Midoriya nodded his head. "Yeah Venom is like that too at times." He said his voice becoming noticeably tired. "My dear tenant has a habit of trying to get me to date certain girls."

"...that's exactly what Scream is doing." Kuroyoku said stopping in her tracks in front of an alley. Her silver eyes were ridiculously wide as she looked at him.

"Of course the daughter acts just like her father." Midoriya said rubbing his temples. "Who'd Scream try to set you up with."

"I'd rather not say." Kagekatsu said blushing as she looked away from the shorter boy.

Midoriya shrugged. "Yeah I'd rather not either." He said looking away from her.

Kagekatsu nodded as she stepped into the alley. "I'll see ya later Midori-Chan." She said as her clothes transformed into yellow and red tendrils. Enveloping her and transforming her from a human to a symbiote. "Call us if you wanna talk." Scream said as she sent a tendril of her biomass into a wall before pulling herself into the air, and swinging away from the boy.

Midoriya watched her swing away with a small smile on his freckled face. Even as he ignored Venom's whisperings of her being a good potential mate.

But Midoriya wasn't the only one who watched Kuroyoku swing away. No another man watched her as he was perched atop the antenna of a tall building.

Two years ago he would have followed the girl, and killed her for her use of her power without having any conviction. During that time he falsely believed that those who used their quirks without convictions were the cause of society's ills, but now he knew the truth.

Now he knew that false heroes where the reason why the modern world had so many problems, so many problems that only he could solve. And solve them he would.

He would bring the cold bite of steel down upon these false heroes, and stain the streets with their tainted blood to fix this world.

That is why he calls himself Stain. He'd never stop until all of these false heroes were slain, or until All Might, the only true hero, slew him.

Stain glanced down at the green haired boy that the girl had left behind. He was walking away, likely returning to his home. A black tendril, something that seemed familiar to the killer, grew out of the boy's neck. It seemed to look around for a short moment before disappearing back beneath his skin.

Stain's lips pulled back into a savage smile as he watched the boy walk away. "Hello again Venom." He said immediately recognizing the black tendril. "It's good to see you again."