You are very strong, but my painting style is better than yours!

Kyoraku Shunsui – If you make a move, kill them outright; don't give them a chance to breathe.

"One more is needed..."

She slowly raised her head, her gaze passing through the laboratory's dome, as if she could see directly into the throne room at the other end of Hueco Mundo.

“Iori…”

She had made foolproof preparations to deal with the other captains, but she just couldn't find a perfect way to control her younger brother.

Iori's fighting style has almost no fixed routine. Kido, swordsmanship, hand-to-hand combat, Shunpo... he has mastered every aspect to the extreme, and there is no obvious weakness to be found. Moreover, his spiritual pressure level is obviously higher than Yuuki's, and his technique is also more advanced. At least in terms of Hollowfication research, Yuuki is a step behind.

"As expected... we still have to start from the root cause."

Yuhime pondered for a moment, then suddenly revealed a meaningful smile.

“Spiritual particle information…”

If we can analyze Iori's spiritual attributes, we can find the source of his abilities and even... create targeted weapons or technologies.

Moreover, it cannot be a simple spiritual particle residue, otherwise it will be difficult to discern anything. Ideally, it should be a spiritual particle residue that records all of his information... genetic material?

Yuuki remained unmoved by this. As a researcher, she should maintain a professional attitude. Collecting genetic material was simply a requirement for the experiment, and there was nothing strange about it.

"Looks like I should go visit my dear brother."

Chapter 574 Show Your Elder Sister Enough Respect!

As Iori sat on the throne reviewing the Hueco Mundo territory report submitted by Halibel, her brow furrowed slightly, and she looked up at the entrance to the hall.

"Your security guard is not doing his job properly."

"Don't be too harsh. There are very few people in the entire Three Realms who can stop you from coming in, unless they are beasts like Kenpachi Zaraki who act solely on instinct."

"What a rare guest! What brings you to Las Noches, my lady?"

Iori stood up, without flaunting his status as the King of Hueco Mundo, and calmly stepped down from his throne.

He didn't dwell too much on how Yuuki knew about his relationship with Hueco Mundo, or how she walked in right under the guards' noses without causing any commotion. For a Shinigami who possesses the [Mirror Flower, Water Moon], it's futile to try to keep any secret.

In fact, ever since Iori surpassed his teacher (Yamamoto) in combat power, he never thought of hiding anything from Yuuki.

The compatibility between Zanpakuto and the intensity of spiritual pressure mean that Iori has absolutely no need to worry about being stabbed in the back by someone.

He certainly believed that his older sister wouldn't harm him, but it was like a lion and a tiger growing up in the same den—the key to them living in peace was that both were strong.

If Iori hadn't displayed monstrous talent, how would Yuuki have treated him? Iori hadn't thought about this question, but even if they were still family, they would never be as "intimate" as they were now.

"You're not even a little surprised that I'm here in Hueco Mundo?"

"Since it's under my jurisdiction, it's like your own home, so there's no need to be surprised."

Iori smiled.

Yuuki slowly emerged from the shadows, a half-smile playing on her lips: "Did I disturb your work?"

"No, this is a good time to bring this to a close."

Iori closed the report and then sent it to her private space. "Although Hueco Mundo is very large, to be honest, there aren't that many things to deal with."

"The King of Hueco Mundo... The lords of Seireitei could never have imagined that the Third Division Captain, who seemed to have a bright future in their eyes, was actually the highest-ranking Hollow who ruled Hueco Mundo in private, right?"

"I have only made a small contribution to promoting peace and prosperity between Hueco Mundo and Soul Society, which is not worth mentioning."

"I wasn't praising you..."

Yuhime walked to the throne, sat down on the armrest without any hesitation, closed her eyes and felt it for a moment, "It's not very comfortable either."

"These things have to be uncomfortable so that they can remind the person sitting there not to become complacent."

“You’re talking like a leader now.”

Yuki looked slightly relieved but also had mixed feelings. "The mischievous boy from before is completely gone."

"After all, she has grown a lot, both physically and mentally. My older sister has changed a lot too."

"...Don't call me 'Big Sister'."

Yuuki glanced away. "I'm almost no longer in a position to let you call me that."

"What do you mean?"

"In front of the current King of Hueco Mundo, I can no longer consider myself a superior. Even if you don't mind, my pride cannot accept it."

Iori was both amused and exasperated: "This has nothing to do with personal status. It's a family matter. Why bother with all that?"

"Of course it does matter!"

Yuuki shook her head and said to Iori very seriously, "The most important thing in living in this world is to see your own worth. It's not about who's superior or inferior, but about knowing your own level so that you can find your direction."

"rational,"

Iori thought for a moment, "Then what should I call you?"

"Just call me 'the best sister in the world'."

"Forehead……"

"I've come today to discuss a small matter with you."

Yuuki tapped her fingers lightly on the armrest of the throne, her gaze fixed on Iori's face with a hint of inquiry and amusement.

"Iori, I need your help."

Her voice was soft, yet it carried an undeniable air of authority.

"Oh?"

Iori raised an eyebrow slightly. "It's rare for my older sister to ask for help on her own initiative."

Yuuki gave a light snort: "Don't misunderstand, this isn't a request, it's an invitation to cooperate. My research on etherealization has hit a bottleneck, and I need perfect experimental data."

Once my research findings are available, I will naturally share the technology with you.

"With your abilities, getting data from those broken beings shouldn't be difficult, but since you've come to me personally..."

Iori understood, a slight smile playing on her lips: "So, you've come for my spiritual information?"

"Yes."

Yuuki looked directly at him. "Your spiritual pressure characteristics, soul strength, and even the compatibility between your Zanpakuto and your spirit body... these are the most ideal samples."

Iori did not answer immediately, but walked slowly to the window of the throne room. The eternal crescent moon of Hueco Mundo cast a cool light on his profile.

A moment later, he turned around, flicked his finger, and a drop of bright red blood floated in the air before being sealed by a diamond-like ice crystal.

"It's nothing, take it."

"So simple?"

Yuki was slightly taken aback, clearly not expecting him to be so decisive. She raised her hand and took the drop of blood; encased in crystal, the blood was as clear and translucent as a ruby.

"Aren't you afraid I'll do something with it?"

She narrowed her eyes.

"Why be afraid?"

Iori chuckled: "Besides, if you want ethereal technology, I can give you the complete information right now. Why go through all this trouble?"

"You think I—"

"How could my proud older sister accept charity from her younger brother?"

Iori interrupted her, nodding to herself, "I can understand that feeling too."

“I know you’ve gone ahead of me, but that doesn’t mean anything.”

Yuuki's tone was tinged with sarcasm, yet also contained a hint of resentment: "What I want is not the technology you give me, but the results of my own research. The subject I'm researching isn't simply etherealization; one day you will witness it firsthand and feel awe."

"Perhaps, but I simply helped one of my own. As for what I'm going to do with this drop of blood..."

Iori shrugged: "Whatever."

Yuuki collected the drop of blood into a specially made spiritual container and turned to walk out of the throne room. Just before reaching the door, she suddenly stopped, turned her head, and said, "Iori, let's make a bet."

"What are you gambling?"

“I will create a being stronger and more perfect than ‘Death’, evolving into a new form of life—even surpassing you.”

A burning light flashed in her eyes, "At that time, I want you to willingly call me 'Big Sister' again."

"I did it willingly..."

However, Iori knew that no amount of persuasion would work, so she smiled cheerfully and said, "Alright, I'll wait and see."

"Since it's a bet, there has to be a prize."

"what do you want?"

Iori remained calm, saying, "Basically, there's nothing in this world that I can't provide."

"free."

"Ok?"

"Your freedom."

Yuki's eyes turned dangerous. "If I win, you will have to respect me, fear me, and obey me for the rest of your life, no matter when or where... and you must not talk to strangers, especially women."

“That’s a bit…”

"I'm afraid you're too young to understand the dangers of the world; there are too many bad women out there!"

Yuuki spoke with such confidence, as if she had been thinking about this for a long time but had only held back until now: "Look at you, you're so young and you've already caused so many scandals. People all think that the Aizen family is frivolous..."

Also, good girls like Akame are one thing, but what about Hyōrei and Saitō? They're like wolves in sheep's clothing; one wrong move and you'll be devoured whole—boys, you have to protect yourselves!

"I'm sorry, I don't think I was able to do that..."

"I knew it!"

Yuuki pursed her lips, then smiled sweetly. The speed at which she changed her expression made Iori feel like she was seeing a blur.

"But it's okay, it's normal for kids to make mistakes. From now on, let your older sister protect you~"

"..."

She looked up and met Iori's gaze, a strong conviction hidden within her eyes, striking him vividly. For some reason, Iori, who had been as calm as a breeze even when a supernova explosion occurred, felt an inexplicable unease at this moment.

"Sister..."

"Don't worry, I will become stronger, strong enough to protect you... and I won't let you get hurt."

"I might not... need protection."

"That's what kids think, which is why adults keep them locked up at home."

Yuuki's figure gradually disappeared into the shadows of the corridor, leaving only a light, airy sentence: "Remember, this is a promise."

Oh no, this woman has really gone mad!

A bead of cold sweat trickled down Iori's forehead.

Perhaps it was because his performance in Soul Society was too dominant that Yuuki seemed to be somewhat provoked.

After all, he not only manipulated the entire Thirteen Teams, but also brought the entire Hueco Mundo under his rule... Even though Yuuki was unaware of the series of changes that had taken place in the Spirit King's Palace, from her perspective, Iori had almost become the uncrowned king of the three realms.

Aizen Yuuki is undoubtedly a highly competitive person. Although Iori was strong and improved quickly in the past, Yuuki at least had a psychological advantage:

Once the research on the Hogyoku is completed, through an evolutionary process that breaks through boundaries, she will eventually become a perfect life form.

By then, we'll be able to catch up with Iori in one fell swoop, and even surpass her!

But it seems that since the second war between Iori and the Quincy and the Shinigami, she realized that even with the power of the Hogyoku, she would most likely be no match for Iori... so she was a little upset.

For someone with an overly strong sense of pride, watching someone surpass them and remain far behind, especially if that person happens to be someone very close to them, is indeed quite difficult to accept...

Just as what prompted Sasuke to leave the village was not only his "brotherly" exchange of feelings with his older brother, but also Naruto, whom he had always called a loser, catching up with him by making the family's traditional Rasengan.

Of course, Yuuki didn't give up so easily; she still pinned her hopes on the research of the Hogyoku... but her mindset had changed, and now she was showing signs of developing into a yandere.

This is really worrying...

……

Yuuki's steps were light and quick as she traversed the intricate corridors of Las Noches, as if she were visiting her own home. She eventually arrived at the outer perimeter of Las Noches, in front of a hidden laboratory in the underground space of an abandoned side hall on the east side.