DxD: Scion of Lucifuge

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While Natsuki was undergoing her Devil transformation—

Yuuma Tokoyogi and Aya Tokoyogi's battle reached its climax.

The result? A stalemate.

Roy was surprised. Aya was quite capable, holding her own against a Devil-transformed Yuuma.

Of course, Yuuma's magic was taught by Aya. Knowing each other's strengths and weaknesses, and with similar power levels, it wasn't surprising that Yuuma couldn't secure a victory.

Roy waved his hand, instantly healing Yuuma's injuries.

A magically crafted, God-class Demon Sword materialized in Yuuma's hand.

"Yuuma, go give your mother a proper lesson."

Yuuma looked at Roy, then at the sword, her eyes widening.

"Yes!"

Feeling the immense power of the sword, she eagerly accepted.

She turned and charged towards Aya.

With a Godly weapon in hand, Aya was no match for Yuuma.

Every spell Aya cast was effortlessly dispelled by the sword.

Already injured from their earlier fight, Aya was now severely wounded by Yuuma's relentless assault.

"Roy, what are you going to do with her?" Yuuma returned, holding the battered Aya.

"Bring her along. We'll decide when we get back," Roy said, looking at the disheveled Aya with amusement.

"Yes!"

....

Meanwhile, Natsuki's transformation was complete.

Having already possessed power comparable to an Ultimate-class, Natsuki's strength surged to Maou-class after becoming a Devil.

Aya watched with a mixture of envy and resentment. They had once been close friends, but Natsuki had always been slightly stronger.

Now, the gap between them was insurmountable.

So, becoming one of his servants granted such power?

Aya glanced at Yuuma and Natsuki. Both had become significantly stronger after becoming his servants.

Even her own creation could now defeat her.

How could she accept this?

But as long as he didn't kill her, she still had a chance.

A sly smile spread across Aya's face.

"Natsuki-chan, how do you feel?" Roy asked, looking at the newly transformed Natsuki.

Natsuki examined herself. She had expected to lose power after her contract with the Hell Devil was broken, but she was stronger than ever.

No wonder so many people craved the power of Devils.

She felt confident that she could now easily handle even a Primogenitor.

Seeing her silence, Roy frowned and pulled her into his arms.

"Alright, we'll talk later. It's not good to stay here," he said, then activated a teleportation circle.

They vanished.

....

Back at the castle, Roy prepared to deal with Aya.

He waved his hand, healing Aya's injuries, then said, "Now, you have two choices…"

Before he could finish—

"I'll become your servant," Aya interrupted.

Roy was taken aback. He hadn't expected her to agree so readily.

He hadn't even stated his conditions yet.

But it saved him the trouble of explaining.

He summoned an [Evil Piece] and offered it to Aya.

Sipping the tea Natsuki had prepared, Roy said, "Since you've agreed, I won't waste any more time. Accept the power of the [Evil Piece]."

"No, I have one condition," Aya said, not taking the [Evil Piece].

"Oh? Let's hear it," Roy said, intrigued. He hadn't expected her to make demands in her current situation. Did she not understand her predicament?

"This world—it shouldn't be like this. Witches, Devils, vampires, werewolves, elves…they shouldn't exist. This world should only have humans. I want to change this world," Aya declared, her gaze firm.

Aya and Natsuki had once been close friends, but their differing ideologies had led to conflict. Aya had attempted to use the Black Bible Grimoire to reshape the world, but Natsuki had stopped her and imprisoned her within the prison barrier.

But Aya, in her own twisted way, also desired peace for humanity.

She didn't want humans to be oppressed by Demons.

In this world, ruled by Primogenitors, Demons held dominion, and humans were treated as inferiors.

This was the aspect of Aya that was most captivating—her unwavering, if misguided, dedication to achieving world peace.

And Roy possessed the power to make her dream a reality.

Seeing Roy's silence, Aya's face fell.

Even the other girls didn't believe he would agree to such an outrageous request.

But—

"I agree," Roy said with a smirk.

"Huh?" Aya stared at him in disbelief.

"You heard me. I agree to your request."

....

Aya couldn't believe he had agreed to her naive request.

And with his power—the power to elevate Natsuki to Primogenitor level—her dream might actually come true.

She was overjoyed.

"Thank you!" Aya looked at Roy with gratitude. She believed he had agreed because he understood her dream. Nothing could make her happier.

"Roy, are you serious?" Natsuki asked, her expression grave.

If he did this, the world order would be shattered.

Vampires, angels, witches, Demons—they would all become ordinary humans.

And ambitious humans would no longer tolerate being ruled by Demons.

The world would descend into chaos.

"Of course. It'll be fun," Roy chuckled. He didn't care about the potential consequences. He found the idea amusing.

"Besides, as a human, don't you want to be free from Demon rule?"

Natsuki was speechless.

The Demons' actions on Itogami Island spoke for themselves.

Even though Demons were required to register upon entering the island, they still fought openly in the streets, demonstrating their arrogance and disregard for human life.

The girls fell silent, understanding the plight of humans in this world.

Outside Itogami Island, Demons casually killed humans without consequence. It was a common occurrence.

"Can this—really be done?" Asagi, while agreeing with the idea, was still skeptical.

Transforming all Demons into humans, eliminating all other races from the world…

It seemed impossible.

Yukari, Yukina, Misaki, and La Folia were also in disbelief.

"Hahaha!" Roy laughed. "Of course it can be done. Didn't I tell you? I'm a Demon God!"

With his Stellar-level power, combined with the Magic Authority and Prophecy Authority from the Campione!

Reshaping the world was child's play.

Seeing his confidence, the girls were awestruck.

Perhaps he really could do it.

"I believe you!" Aya smiled radiantly and took the [Evil Piece] without hesitation.

The Devil transformation ritual began.

Roy casually flicked his finger, sending a wave of magic through space that instantly killed the Hell Devil Aya had formed a contract with.

He wasn't interested in waiting. He picked up Natsuki and headed towards his room.

"Hey, what are you doing?" Natsuki asked, a hint of fear in her voice.

"What do you think? Doing what adults do. You did say you were twenty-six, didn't you?" Roy smirked.

"But…but…" Natsuki's heart pounded as they neared his room.

Just then, Nagisa, Yukina, and the other girls blocked the doorway.

"Onii-chan, you can't bully Natsuki-chan!"

"I won't let you become a loli-loving pervert!"

Roy's eye twitched. He had just been teasing Natsuki, but they clearly didn't believe him.

"If I can't bully Natsuki-chan, then how about you two?" He put Natsuki down and looked at Nagisa and Yukina with a mischievous grin.

The two girls yelped and ran.

"Run! The Demon Lord is going to bully us!"

"We won't let you!"

Roy chuckled and chased after them. The living room was filled with laughter and playful screams.

Natsuki smiled, watching the scene unfold. It seemed she had made the right choice.

....

That evening—

Roy had been planning to visit Yukari and—spend some quality time with the green-haired elf. But to his surprise, Yuuma and Aya came to his room.

Both were wearing only towels, their youthful bodies alluring despite their slight lack of maturity.

They were almost identical in appearance, height, and build.

The only difference was Aya's long, flowing hair, while Yuuma's was short and practical.

Aya seemed more mature and elegant.

But in this particular activity, Yuuma was more…enthusiastic.

At least, that was Roy's impression.

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