My Harem System In My Hero Academia

Most of the class had already changed into their hero costumes and were chatting loudly about their designs. 

The room was alive with excitement—until Momo stepped out of the changing room.

The moment she appeared, conversations stopped. Every eye turned to her. Momo's hero costume left nothing to the imagination. 

The tight red top barely contained her massive tits; the fabric stretched so much one could see every curve and how they bounced. 

Her slim waist led down to a red miniskirt that clung to her wide hips. Straps wrapped around her body like they were begging to snap under the pressure of her curves.

Mina grinned, her eyes flicking between her own chest and Momo's. "Damn, girl, you're giving me a run for my money!" she said, giving her own tits a playful squeeze as she walked up to Momo.

Uraraka blushed, folding her arms over her own body. Her thick ass might've been bigger, but even she felt overshadowed. "Momo… your costume's really… revealing," she muttered.

The boys, however, were a mess. Kaminari's jaw hung open, drool threatening to spill. 

Mineta's eyes practically popped out of his skull, his tiny hands twitching like he didn't know whether to clap or grope. 

Sero whistled low under his breath, while Kirishima gave a thumbs-up with a sheepish grin.

"Ridiculous," Bakugo scoffed, though his eyes lingered on her chest longer than he'd admit. 

As always, Todoroki remained stoic, though his gaze briefly crossed her body before returning to an empty wall.

Ida, though, was the most "impressed" by Momo's costume. He knew Momo was one of the two recommended students, and he was intrigued by the idea that such a prestigious and devoted student could wear such clothes.

Ida pushed his glasses up and marched toward Momo. "Yaoyorozu! Why is your costume so—so scandalous? It's inappropriate for a future hero!"

Before Momo could respond, Mineta launched himself into the air, arms outstretched and aiming straight for her tits like a perverted missile. 

But before he could get close, a white-gloved hand shot out, grabbing him midair by the yellow scarf of his costume.

Yami stepped out from the boys' changing room just in time to stop the filthy rat from touching his girl's boobs. 

His Hero costume was as simple and with as much cloth as he could: a sleeveless red gi-like top, tied with a deep blue ribbon around his waist, paired with loose red pants and a black vest hung over his shoulders. 

The fabric hugged his muscular body without being too tight, so he couldn't move. Yet, enough so his defined muscles were visible. 

Still, the design left his thick arms bare, showing off his defined biceps and forearms.

His golden eyes, set against his sharp features, glinted under the sunlight pouring in from the sky.

For a moment, everyone just stared.

Sero was the first to break the silence. "Dude, that costume is badass!"

"Yeah, it's kinda like a martial artist's uniform!" Kaminari added, walking up to get a closer look. "You look like a fighting game character or something!"

Ojiro nodded. "It suits you. Simple, but you look ready to throw down; it seems I'm not the only martial artist in this class."

Even Tokoyami gave his approval with a respectful nod. "It exudes strength and discipline."

Yami smirked, enjoying the praise but staying cool. "Thanks. It's based on something I wear to Kendo tournaments, but I changed up the colors and added a few personal touches."

He didn't mention that his outfit was heavily inspired by Vegito from Dragon Ball. 

'Sadly, no one here will ever know who that is,' Yami thought. 'I'd have gone with Gogeta, but I'm not buff enough to pull that off yet.'

As more of the boys gathered around to admire his outfit, Mineta wriggled furiously, still hanging by his scarf in Yami's grip.

"Let me go, you bastard!" Mineta whined.

Yami tightened his grip, lifting Mineta slightly higher. His expression darkened as he turned back to the group.

"Oh, right... Alright, enough," Yami said, his voice firm. "Let's address the real problem here."

The crowd quieted as Yami pointedly looked around. His golden eyes landed on Mineta, then flicked to a few others who had been ogling Momo earlier.

"You all need to cut the shit with the comments about Momo's costume," Yami said. "Her Quirk needs her to have skin exposed to create things. She's not dressing like that because she wants your attention. It's practical."

Mineta whimpered, clearly uncomfortable in Yami's grip. "B-But it's—"

Yami cut him off with a glare that could freeze fire and burn ice. "And let's be real, even if she covered up more, most of you would still stare. It's not the costume. It's her body."

Momo's cheeks turned bright red. She opened her mouth to say something, but Yami wasn't done.

"Maybe try showing some respect instead of acting like horny jackasses," he added, tossing Mineta to the ground like a sack of trash. "And if you can't do that, fuck off and stare at me, I got bigger ones anyways~." Yami said as he pressed his chest together, bulging his chest muscles.

Mineta scrambled to his feet and scurried off, muttering under his breath about getting back at Yami.

Kirishima, who had been watching the whole thing with wide eyes, suddenly smiled.

"That was so manly!" Kirishima declared, giving Yami a thumbs-up. "Standing up for her like that? Dude, you're a real hero!"

Yami shrugged, looking at Momo. "Just saying what needed to be said."

Meanwhile, Momo bit her lip, trying to process what had just happened. She appreciated Yami's defense, but deep down...

'I actually made my body this thick for him,' she thought, glancing down at herself. After mastering the ability to redistribute and focus her fat using her Quirk, Momo had intentionally sculpted her figure to be more "appealing" to Yami. 

She wasn't sure if he realized it, but she'd practically built her curves to be exactly his type based on Angela and other women Yami stared at while growing up.

'And this is still the most practical suit I've ever designed...'

As the boys crowded around Yami again, eager to touch his costume, Kirishima spoke up first.

"What's the inspiration, man?" Kirishima asked, running his hand over the fabric of Yami's gi. "It's so cool!"

"Yeah, it's simple but badass," Sero added, pulling at the ribbon around Yami's waist. "Is this, like, a traditional martial arts outfit?"

Yami chuckled, scratching the back of his head. "Kinda. Like I said, I wear something similar for Kendo tournaments. I just changed the colors and added the vest and ribbon for style."

'I really need to get stronger to pull off a Gogeta...'

As the boys continued to praise his outfit, Bakugo stood off to the side, his arms crossed and his brows deepening with every passing second.

First, Yami had shown him up during the entrance exam.

Then, on the first day of class, he had taken a jab at his physique.

And now? Now the whole class—both the guys and the girls—was fawning over him like he was some kind of superstar.

"Tch," Bakugo growled under his breath. "Fuckin' showoff..."

Just as Bakugo was reaching his boiling point, All Might's booming voice cut through the chatter.

"Alright, young heroes!" All Might called out, striding into the training field with little jumps. 

"I see you've all got your costumes on. Excellent! Now it's time to move on to the next phase of your training!"

The students quickly gathered around as All Might continued. "Today's activity is called… Indoor Anti-Personnel Battle Training!"

The class erupted into whispers and murmurs as everyone thought what it could be.

"Villain battles are most commonly seen outdoors," All Might continued. "But statistically speaking, the most heinous villains are more likely to operate indoors—through confinement, house arrest, or black market dealings!"

He paused for dramatic effect, his blue eyes gleaming.

"Your task is simple! You'll be split into hero and villain teams and face off in two-on-two indoor battles!"

Tsuyu raised a hand. "So… no basic training?"

All Might shook his head, grinning. "Practical experience teaches you the basics, young Asui! And today, you'll be fighting real opponents, not disposable robots!"

Yami couldn't help but grin. He remembered this part of the manga well... kind off. 

While he wasn't exactly looking forward to Midoriya's fight with Bakugo, he was excited to see how he'd fare in his own match.

All Might then held up a box filled with slips of paper from seemingly nowhere.

"Your battle partners will be decided… by drawing lots!"

Momo raised her hand, "Is that really the best way to ensure fairness?"

All Might laughed heartily, ignoring her question. "We're drawing lots because that's how we do it, young Yaoyorozu!"

After walking over to a basement to everyone could see the matches. The students each took turns drawing their lots, with everyone eagerly anticipating their matchups.

Finally, Yami looked at his slip of paper.

"Me and Sato… against Momo and Mineta."

Yami's eyes darkened, 'Oh, this is gonna be fun,' he thought.

Mineta, on the other hand, visibly paled once he saw he was going to "fight" his "archrival".

Yami looked over everyone, searching for Sato. 

Eventually, he spotted a tall figure in a bright yellow hero costume—Sato Rikido. 

It wasn't his height that caught Yami's attention at first, but the eye-catching color of his outfit.

As Yami approached, he noticed something, Sato wasn't towering over him like he expected. 

In fact, they were roughly the same height. Yami glanced around at his classmates and realized that, compared to most Japanese, he stood out as unusually tall. 

Even Shoji, the tallest in the class, was only a finger's width taller than him.

'Ain't that something,' Yami thought with a smirk.

[It's not the only thing that's big~] the system chimed in with its usual smug tone—somehow, even though it didn't have a voice.

Yami sighed, ignoring the comment as he reached Sato and dapped him up in a casual handshake. 

"Yo. I'm Iwatani Yami. Quirk Pillar Man. I can turn my skin or external parts of my body into a stone-like material, manipulate my limbs, and heal instantly. But I can't stay in the sun without a special cream."

Sato nodded. "I'm Rikido Sato. Quirk, Sugar Rush. The more sugar I eat, the stronger I get."

Yami raised an eyebrow, expecting the usual drawback. "And you get sleepy afterward?"

Sato shook his head. "Nope. My muscles go back to normal if I don't keep eating sugar."

Yami raised an eyebrow 'Wait... Oh right, the patch up from Snail,' "That's a pretty solid quirk."

"Yours too" Sato said with a smile, "I think we are second after Bakugo and Midoriya."

Sato then stared into Yami's eyes, his expression turning serious. "So… you and Yaoyorozu know each other?"

"Yep. We're childhood friends," Yami replied, his tone matching Sato's seriousness. They locked in for a moment.

"So, it's like that, huh?"

"Yep, it's like that."

The tension was as dry as ice before both cracked a smile and broke into laughter. "Hahaha!"

From a distance, Momo watched Yami, while the class watched Midoriya and Bakugo fight, unaware that Mineta was beside her, scribbling furiously as he analyzed the first match between Midoriya and Bakugo.

'I'll show him!' Mineta thought, gritting his teeth. 'I'll prove who the real man is!'