High School DxD:Milking System World

Jin and Issei walked to school together after finishing their breakfast.

As they strolled down the familiar path, Jin took the opportunity to observe his surroundings. As usual, the girls from Kuoh Academy watched him with admiring eyes, some even squealing with delight when their gazes met.

When he looked their way, a few girls covered their mouths with their hands while jumping in place, their eyes sparkling with excitement.

'Why do they always cover their mouths when they jump? I'll never understand that.' Jin thought to himself.

However, he soon noticed something unusual—something that hadn't happened before. He could now instinctively tell that the girls around him were normal humans. But more surprisingly, he could also discern the actual size of their breasts, even beneath their clothing.

'D-cup, C-cup, and… A-cup? Oh, she's using pads.' Jin noted as his gaze briefly passed over three girls walking together.

From an outside perspective, the three girls appeared to have similar bust sizes. However, Jin's new ability allowed him to see through the illusion—revealing the real differences hidden beneath their uniforms.

'So this is the effect of that skill—Size Scouter (Breasts)—that I got from Aika, huh?'

With a thought, Jin summoned the System panel. The familiar blue interface appeared before his eyes, floating just above his field of vision. Quickly skimming through the familiar sections, he focused on the skill description he wanted to check.

Skill Description:

• Size Scouter (Breasts) [Level 1]

You can calculate breast size just by looking at it. Additionally, when you are close to a woman, you can vaguely sense her strength. (Accuracy: Low)

[Source: Kiryuu Aika]

'So that's why I felt something strange from Kaichou and Issei's girlfriend. They're stronger than normal girls, and this skill helped me sense it. The low accuracy is a bit of a drawback, but I should still trust my instincts.'

Jin stroked his chin thoughtfully, a faint grin forming on his lips.

In the background, several girls squealed in excitement as they saw his charming expression.

"Hey, Nii-san… You do realize the girls are literally screaming right now, right?"

Issei's voice snapped Jin out of his thoughts. Turning to his brother, Jin found Issei staring at him with a mixture of amusement and exasperation.

Blinking a few times, Jin looked around and noticed that some of the girls had actually fainted from excitement.

"…Haha… Hahaha… My bad. I guess I got lost in my thoughts," Jin replied with an awkward chuckle.

"Well, I'd appreciate it if you could tone it down a bit. Their squealing is really annoying. And whatever you do—don't make that face in front of Yuuma-chan."

"I'll try."

Continuing their conversation, the brothers entered the school building and headed to their classroom.

As always, Aika greeted Jin with her usual playful grin, while Issei made his way to his seat.

Morning Class Routine

The morning passed without any major incidents—until Matsuda and Motohama approached Issei with a newly acquired erotic magazine.

However, to everyone's surprise, Issei refused to look at it.

The entire class fell silent in shock, as if witnessing a once-in-a-lifetime phenomenon.

Among the most surprised was Aika, who immediately pestered Jin with a barrage of questions. Did Issei eat something strange? Did he drink holy water? Was it some kind of curse?

Jin couldn't help but laugh at her reaction. Still, he patiently explained Issei's recent change of heart, much to Aika's disbelief.

'Issei's transformation is going to make my days a lot more interesting. I can't wait to see everyone's reactions.' Jin thought with a smile.

Kuoh Academy - Kendo Club Dojo

Or so Jin had thought that morning…

Unfortunately, fate had other plans for him.

Instead of enjoying a peaceful afternoon, Jin found himself standing inside the Kendo Club's dojo—alongside Issei, who had been falsely accused of stealing the girls' underwear.

Facing them were two Kendo Club members: a girl with short pink hair named Katase and another with twin-tailed brown hair named Murayama. Both wore white hakama—the traditional attire for Kendo practice.

Jin exhaled quietly, keeping his voice calm as he addressed the girls.

"Can you tell me the details, Murayama? Katase?" he asked seriously. "Because there's no way Issei stole the Kendo Club's panties. I don't believe it."

"But we found this in his locker, Hyoudou-kun."

Murayama stepped forward, holding up a pair of white panties.

"The person who found it also discovered three other pairs in his friends' lockers. Isn't that enough evidence?"

"W-What the hell is that?! I didn't do anything like that!" Issei shouted, his voice echoing through the dojo. "I spent the whole day with Nii-san—and no, he didn't put any panties in my locker either!"

He glared at the two girls, frustration evident on his face.

"And even if I wanted to peek or steal something, I wouldn't do it now! I have Yuuma-chan!"

'Well, that's true. I did spend most of the day messing with Issei during PE…' Jin thought with a smirk.

During PE class, Jin had tackled Issei into the mud and spent the rest of the day teasing him about their earlier race. With how closely Jin had stuck to Issei, there was no chance his brother could have stolen anything.

"Unfortunately, no," Jin said, shaking his head.

"But—" Murayama started, only for Jin to cut her off.

"If that's all you wanted to say, then we'll be going. I'd rather spend my time doing something productive than listening to false accusations."

Turning toward Issei, Jin clapped his brother on the shoulder.

"Let's go, Issei. Remember—you still have to do what I told you for the rest of the week. You're the one who challenged me to that race, after all."

"Argh! There's that too!" Issei groaned, rubbing the back of his head. "J-Just… Don't make me do anything weird, okay, Nii-san?"

"Don't worry. By the end of the week, you'll only wish you hadn't made that bet with me. I'll make sure you scream with delight before it's over."

The two brothers turned to leave, with Jin smiling confidently and Issei slumping his shoulders in defeat.

Despite his current predicament, Issei couldn't help but feel grateful—after all, Jin had saved him from being beaten up by the Kendo Club girls.

However, just as they reached the door, Katase's voice rang out behind them.

"Wait!"