My Harem System In My Hero Academia

Angela held Yami's hand as they walked into the clinic, the automatic doors sliding open with a soft hiss. 

The sharp smell of disinfectant hit him immediately, making him wrinkle his nose. 

It was way too early in the morning for this, and since he had his birthday and had awoken his system just the day before, he couldn't be bothered for a medical check-up, and the place was annoyingly busy. 

Kids were crying, nurses were running around, and the whole place felt like slow-motion chaos.

Yami glanced up at Angela. She looked calm, as always, her half-shut eyes and soft humming cutting through the noise like she was in her own little world. 

Her long blonde hair swayed with every step, catching the attention of pretty much every guy in the waiting room. It wasn't surprising—his mom was drop-dead gorgeous, and her black and gold kimono wasn't exactly subtle.

Angela approached the receptionist, her voice sweet as honey. "We're here for Yami Iwatani's check-up."

The receptionist, a young man who looked like he was about to drop his pen, nodded quickly and told them to sit down. 

Yami climbed onto one of the stiff chairs, kicking his legs while trying not to make eye contact with the other kids in the room. 

Most of them were showing off their quirks or whining to their parents. It made him roll his eyes.

When a nurse finally called his name, they were led down a few hallways to a small examination room. It was bland and boring—white walls, metal furniture, and bright overhead lights. Yami hated it instantly.

"Good morning," the doctor greeted as he walked in. He was a middle-aged man with glasses and thinning hair, looking like every generic doctor ever. "I'm Dr. Takada. Let's get started."

Yami stayed quiet, eyeing the doctor suspiciously. He didn't trust anyone who worked in a place that smelled like this. 

Angela gave him a soft nudge, her gentle smile telling him to behave. Begrudgingly, he climbed up onto the exam table.

The doctor started with the usual stuff—height, weight, and checking his vitals. But as he scribbled on his clipboard, his face started to shift. His brows furrowed, and his lips pressed into a thin line.

"Hmm... interesting," he muttered. "What's interesting?" Angela asked, her head tilting slightly.

"Well, Yami is very tall for his age," Dr. Takada said, glancing at his notes. "At four years old, he's already 110 centimeters. That's significantly above average for children his age."

Angela's face lit up with pride. "He's always been a strong boy."

The doctor nodded, moving on to more measurements. As he went through them, his expression grew more and more surprised. 

"His weight is proportional to his height, but his muscle density and bone structure... This is not typical for a child. It's like his body is developing faster than it should."

Yami smirked to himself, feeling a bit smug. All those secret workouts at night were paying off, even if he still had the body of a toddler. But then came the awkward part.

"Angela," Dr. Takada said, his tone a bit hesitant, "I'll need to do a full physical exam. That includes... well, everything."

Angela nodded without hesitation. "Of course. Whatever you need to make sure he's healthy."

Yami groaned internally as Angela helped him out of his clothes. He sat there, glaring at the wall, as the doctor examined him. 

When Dr. Takada got to the lower half of his body, he froze for a second, his pen hovering over his clipboard.

"Uh..." The doctor cleared his throat, clearly trying to stay professional. "This is... unexpected."

"What's unexpected?" Angela asked, concern creeping into her voice.

Dr. Takada adjusted his glasses, looking almost embarrassed. "Yami's genital development is... unusually advanced. His testicles and penis are far more developed than what's normal for a child his age. In fact, they're larger than the average adult male in Japan."

Angela blinked, her eyebrows raising slightly. "Is that bad? Should I be worried?"

"Not necessarily," the doctor assured her, though his tone held a hint of unease. "It's just... unprecedented. His body seems to be maturing at an accelerated rate, though not in a way that suggests any immediate health concerns. I'd like to monitor this closely as he grows."

Yami felt his face heat up, both from embarrassment and annoyance. He was four, for fuck's sake, and the last thing he needed was people gawking at his cock like he was some kind of freak show.

"Can we move on?" he snapped, his voice sharper than a typical four-year-old's should be.

Dr. Takada cleared his throat again, quickly shifting gears. "Of course. Let's move on to the quirk analysis."

He reached for Yami's foot and inspected the structure of his toes. The doctor's expression brightened slightly as he found what he was looking for. 

"Ah, there it is. Yami has the characteristic single joint in his pinky toe, which strongly indicates he possesses a quirk."

Angela clapped her hands together, her smile radiant. "Oh, Yami! You have a quirk! Isn't that wonderful?"

Yami internally shrugged since, from the system, he already knew he had a quirk, but he faked excitement since he was a kid and wasn't supposed to know.

Dr. Takada moved to a nearby console, activating a small device to measure quirk potential. He pressed it against Yami's wrist, and the screen lit up with a barrage of data.

"Hmm..." the doctor murmured, his brows furrowing again. "This is... fascinating. Yami's quirk signature is highly unusual. It's there, but the specifics are... murky. It's almost as if it's dormant, waiting to activate fully under certain conditions."

Angela tilted her head, her concern returning. "Is that normal?"

"It's not unheard of," Dr. Takada replied, though his tone suggested otherwise. "Some quirks don't manifest until later in childhood or even adolescence. However, Yami's readings suggest a quirk with significant alteration to his metabolism, almost like a mutation-type quirk. It's rare to see such strong indicators at this stage."

Angela's smile returned, her hand resting on Yami's shoulder. "You're going to be amazing, Yami. I just know it."

Yami smirked, his golden eyes gleaming with determination. He didn't need the doctor to tell him that—he already knew. 

Whatever his quirk was, he would make it a world-changer and use it to reshape this world to his liking.

As the check-up concluded, Dr. Takada handed Angela a stack of notes and recommendations. 

"I'd like to schedule a follow-up in six months to monitor Yami's development. In the meantime, ensure he gets plenty of rest and a balanced diet. His body is working harder than most children's."

Angela nodded, thanking the doctor as she helped Yami back into his clothes. 

As they left the clinic, Yami felt a spark of excitement despite the awkwardness of the check-up. 

His body was primed for greatness, his quirk was lurking just beneath the surface, and he had the system to guide him every step of the way.

And so, a few weeks after the check-up, Yami was outside helping Angela with her garden. 

It wasn't anything fancy—just some veggies she'd decided to grow for fun. The sun was out, Angela hummed, and everything felt surprisingly tranquil.

Then it hit him—like, literally hit him. Out of nowhere, it felt like his whole body caught fire.

He screamed, collapsing into the dirt. His skin burned like someone poured acid over him, and his insides felt like they were twisting into knots. 

It was way worse than getting hit by a truck and burned alive, which was saying something since he was hit by a truck and burned alive while he bled out. 

Fun times.

Angela was by his side in a flash, her kimono slipping off one shoulder as she dropped to her knees. "Yami! What's wrong, baby? What's happening?!" Her tits jiggled wildly as she leaned over him, barely contained by the thin fabric that was already doing a pretty shitty job of covering them.

But Yami couldn't even focus on that—not with his body burning. He clawed at the ground, his screams turning even louder as the burning got worse. 

And then he noticed it: his skin wasn't just burning. It was hardening, darkening, cracking like stone.

"What the hell?!" he tried to shout, but his voice came out as a garbled mess. His arms, legs—everything was turning into rock, and he couldn't do anything about it.

Angela tried to hold him, her hands desperate and soft, but even her touch couldn't stop whatever was happening. 

"Yami, stay with me!" she cried, tears streaming down her face. Her kimono fell open even more as she tried to pull him into her lap.

The pain was insane like his body was being ripped apart and glued back together. He couldn't move or breathe—just locked in place as the stone overtook him. And then… black.

...

When Yami finally came to be, he first felt a soft warmth pressed against his face. It was familiar—plump, round, and spilling out of some loose fabric. 

Yeah, it was Angela's tits, and holy snail, they were even bigger than he remembered. His face was buried in them, and they were... wet? Wait, were they lactating?

"Yami!" Angela's voice broke through his foggy thoughts. She was crying, holding him tight against her chest. 

Her tits squished against him with every sob, and her kimono was hanging so loose it might as well not even be there. "You're okay, baby, you're okay! I was so scared!"

It took him a second to piece things together. His body still felt heavy as hell, like he'd been hit by a train, but he was alive—or whatever counted as alive after all that. 

He tried to move, but Angela held him tighter, her tits practically smothering him as she stroked his hair.

Then it popped up—a glowing screen right before his eyes.

[Congrats, Yami! You've awakened your quirk.]

"Finally," Yami muttered, his voice scratchy and muffled. Whatever had just happened sucked, but if this was the start of his new life, then it was all worth it.

[Cooking Rice]