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The rattle of the manhole cover was Izuku's only warning before he was swept up in a tidal wave of goo that was forcing its way into his mouth.
“Sorry kid, but I need a place to lie low for a while. I hope you don't mind, it's not like you get a say in the matter.”
The villain poured into Izuku's lungs and esophagus as he struggled pointlessly.
‘This is it,’ Izuku thought, eyes filled with tears, ‘this is how I die.’
The villain, however, had other plans. He passed Izuku enough oxygen to stay awake as he pulled down the teen's pants and underwear. Izuku burst into tears as the villain forced his way up his hole. He flooded Izuku's intestine, stretching them just shy of tearing, and Izuku’s belly popped open the buttons on his school uniform as it grew to easily four times its regular size by the time the villain had reached his stomach again.
There was no more space in Izuku for the villain to go, yet he continued to pack himself inside. Eventually, enough of him had been pulled inside that he couldn’t hold Izuku up anymore, and the still flailing teen fell to the floor. By this point, Izuku's torso contained many times his entire body weight, so he couldn’t hope to pick himself off the ground as the last bits of the villain found their way inside him.
Izuku’s face contorted in silent agony as tendrils of sludge pressed against the inside of his too-stretched organs and began to tear his flesh. The villain flowed thickly into his veins, causing Izuku to become numb and light headed as it replaced his blood, turning his visage a sickly green as the villain wormed his way into every nook and cranny.
Against his will, Izuku’s body stood up. His hands pulled up his pants, uncomfortably stuffing his forced erect penis inside, and his legs took him out of the underpass and toward a nearby trash can. His mouth was pulled open and a tendril of green popped out, and from it spewed black muck that made Izuku feel truly sorry for whoever had to empty this can later. To make matters worse, Izuku's belly and chest deflated substantially and his whole body felt so much lighter. Once the villain was done doing… whatever that was, Izuku saw the tendril pull back in.
His body just stood there, shaking due to Izuku's fruitless struggles, as the villain worked on something that Izuku couldn't see.
Soon, Izuku's belly and chest deflated perfectly to normal size, and his body resumed breathing. The villain buttoned up Izuku's school uniform, picked up Izuku's backpack, then turned Izuku's phone all the way off.
Over a day later, Midoriya Izuku was officially reported missing.
~~~
Izuku wished that the villain would just leave him and let him die already. He knew there was no way to save him, the villain had completely replaced his blood and destroyed multiple vital parts of his brain when he assimilated it, but it was better than being used like this.
The villain sold his body for cash, and he forced Izuku to like it. He was made to service men and women with his hands and mouth, let people stuff their cocks up his ass, and basically any kinky shit that was even remotely biologically possible for anyone brave enough to ask.
With the money, he was made to buy ludicrous amounts of food and stuff himself full. At first, Izuku thought that the villain simply ate just that much, but it soon became clear that it was for him. He was hit with the mother of all growth spurts, and there was no way that it was natural. He outgrew his clothes twice a week, and in just a couple months he had gone from a five foot nothing, barely a hundred pound teen to a six and a half foot, well over three hundred pound behemoth who looked to be at least twenty.
He wanted to say that he couldn’t even recognize himself in the mirror, but he honestly could, and that scared him. The villain hadn't changed very much about his face, so beyond the pale, green-tinted skin he pretty much just looked older. Even his expressions looked right, mainly because the villain was using Izuku's own hijacked motor cortex.
He just wanted it to end. He didn't care if he didn't make it, he just wanted it to stop.
~~~
Over a year after he was first taken, Izuku was still being kept alive. It was mostly for his analysis. The villain simply couldn't do that on his own, so he needed Izuku for it. So many heroes had been killed, it made Izuku feel sick.
He was over seven feet tall now, larger than the now retired All Might used to be. They'd narrowly avoided capture at the USJ, and had to dodge around to avoid capture by either Heroes or the League themselves for a while.
Currently, they were doing low level grunt work for the Yakuza. It was better than having his brain and body sold, but Izuku still hated it.
Their specific task right now was to recapture an escaped little girl, and Izuku had to wonder why the Yakuza even had one in the first place. The villain, using Izuku's investigatory skills, was hot on her trail now. She'd gotten surprisingly far, but Izuku was sadly too smart for that, even if he did want to save her. She looked utterly terrified when the villain caught her, and Izuku felt like his heart was being ripped from his chest at the sight.
Then he was blinded by golden light, and horrid pain racked his body.
Izuku screamed as he blinked the light from his eyes, and looked at his hands in amazement. He touched his now thin chest through the now much too big shirt, and finally cried in joy and relief. He… he was free.
He looked around quickly, and he saw the green, slimy form of the villain still obviously unconscious. Then his eyes caught sight of the clearly exhausted little girl who was only being kept awake by her panic, which only got worse as she realized he was awake.
Izuku held up his hands in surrender. “It’s okay,” he told her, “It’s okay. I’m not going to hurt you.”
He got up, the shirt falling like a dress over his now correctly child sized body. The girl looked like she was about to try and bolt, so Izuku made sure to not approach.
“I’m not going to take you back. I want to escape too. Can I get closer to you?” He told her in as comforting and even of a tone as he could.
Her eyes widened, “No! No, no! Don’t come any closer! I don’t want to hurt you!” she screamed.
Izuku shushed her in a panic of his own.
“Be quiet!” He harshly whispered, pointing to the villain “That green thing is one of Overhaul’s men. He was using me earlier. Neither of us want him to wake up, right?”
The girl nodded in agreement.
“Okay. So you're worried about losing control of your quirk, right?” Izuku asked.
The girl looked confused. “What’s a Quirk?” She asked him.
Izuku felt a pang of pity arc through him. “The golden light? That was your quirk, right? You used it to separate me and that villain”
The girl's eyes widened, “My curse! I used my Curse on you! I’m so sorry!”
Suddenly, Izuku heard footsteps approaching. They were followed. Shit!
Izuku silently prayed that the girl was just paranoid and ran forward as fast as he could to grab her before they were spotted. He scooped her up in his arms, and exited the other side of the alleyway with the panicking girl in his arms.
He ran into a hero soon after, a sidekick calling himself Lemillion, and Izuku and the girl were taken to Nighteye agency.
~~~
After the investigation and the raid, he had been returned to his Mom. The girl who saved him, who was named Eri, had been adopted by the hero Eraserhead, one of Izuku’s favorites. They also lived surprisingly close by, so Izuku hung out with them a lot while waiting for his paperwork to be corrected. Being legally dead would always be annoying to deal with, and since he’d been returned to age fourteen he needed to go back to being that age to get his life on track again. Both tasks were suspiciously easy, and when he had asked Eraserhead he only muttered something about rats in a strange combination of begrudging acceptance and gratitude.
He had finished his last year of middle school with little trouble, mainly on account of going to one online. Aldera, the school he used to go to, wasn’t around anymore for some reason. He wasn’t all that sad, that place sucked.
Now, almost three years after he was taken, Izuku stands in front of UA high-school, ready to take the hero course entrance exam. He was nervous, but Eraserhead, known to him now as Aizawa Shota, had done a good job of training him.
In spite of it all, Midoriya Izuku would still become a hero.