In DxD Starting with Sign-Ing in as the Red Dragon

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In the blink of an eye, Akira and Seekvaira Agares found themselves transported to an alternate dimension.

"Akira... that teleportation circle's crest just now..." Seekvaira recognized the emblem's design.

"That's right. It's the crest of the former Leviathan," Akira nodded. He was all too familiar with that emblem because... the magic circle he used bore the same crest!

In the next moment, a dark purple teleportation circle flashed before Akira and Seekvaira. A tall, mature woman wielding a staff emerged gracefully from the circle. She had dark skin, towering over Akira even in high heels, embodying the archetype of a dark-skinned beauty.

As everyone knows, arrogance and a certain provocative allure are the hallmarks of such women.

The dark-skinned beauty smiled with a hint of condescension, looking down at Akira as if he were an insect.

"The fake Leviathan propped up by the new Maou faction, welcome to my domain."

"I heard you've been granted the Demon Pieces recently?" Katarea licked her crimson lips.

"That's correct," Akira replied calmly.

"Katarea, what brings you here?" Akira addressed her by name.

The dark-skinned beauty was none other than Katarea Leviathan.

Katarea had long, flaxen hair, red glasses, and two braids framing her face, resting gently on her ample chest. Her wine-red stockings and revealing Maou outfit showcased her thighs and flat stomach, drawing attention to her well-maintained figure.

From the fullness of her thighs to the flatness of her stomach, it was clear that while Katarea might not excel as a Maou, she certainly excelled as a woman.

As Akira had pointed out, Katarea was far from outstanding as a Maou. For a Maou, strength was paramount, and she... was weak.

Katarea Leviathan, a descendant of the former Leviathan Maou, had joined the Khaos Brigade to reclaim her family's throne. She became the leader of the Old Maou Faction's Leviathan branch, making her a minor Maou in her own right.

As the saying goes, Serafall Leviathan is often referred to as the "lesser Katarea" (laughs).

In the original storyline, during the Three Factions Summit, Katarea and her allies attempted to assassinate the leaders of the three major factions. In her duel with Azazel, Katarea used Ophis's "Snake" to boost her power. Yet, even with this enhancement, she was no match for him. In the end, she tried to self-destruct, taking Azazel with her, but he severed his own arm to escape and ultimately defeated her.

Her strength was lacking. Even with Ophis's Snake, she only reached the peak of Maou-level power. Azazel didn't even need his artificial Sacred Gear to defeat her. He only used it to test its effectiveness.

In short, her strength and foolishness were perfectly matched. She was neither strong nor particularly bright, foolishly believing that Ophis's Snake would allow her to challenge the leaders of the three great factions. These leaders were seasoned warriors—how could a half-baked Leviathan with a borrowed power hope to stand against them?

"Katarea?"

Hearing Akira address her without a hint of respect, Katarea's gaze turned icy.

"Don't call me Katarea!"

"Address me as the true Leviathan-sama, you fake!"

[Water Cannon!]

Raising her staff, Katarea fired a water cannon directly at Akira.

"Akira! Be careful!" Seekvaira reacted faster, deploying the Agares family's exclusive defensive barrier to block the attack.

"Hmph! The next head of the Agares family?"

"A family that kneels before the current Maou dares to stand before me!?" Katarea sneered, steadily increasing her magical output.

"An Old Maou, and a Maou-level one at that," Seekvaira murmured, her lips pressed tightly together.

Though she was no match for Katarea, as one of the top-tier High-Class Devils, she wouldn't be easily defeated.

Akira didn't immediately step in to help Seekvaira. Instead, he quietly retrieved a "pet collar" from his system inventory, concealing it within his sleeve. He then looked up at Katarea.

"Katarea, why have you come for me?"

"Why? How dare you ask! Of course, it's to take you away from the fake Leviathan's grasp!"

"Take me away? Now?"

"If you really wanted to take me, shouldn't you have done it sooner?" Akira countered.

"Hmph! Why now?"

Katarea laughed bitterly. How dare this traitor question her!?

"It's because I heard you've been granted the Demon Pieces! Receiving them means you're about to marry the fake Leviathan's sister!"

"I can't allow a fake Leviathan to marry the fake Maou's sister! That would be an insult to the true Leviathan!" Katarea declared, her eyes blazing with anger.

"Ah~ So you're here because of my engagement to Sona... Well, I've already called it off," Akira replied nonchalantly.

"Huh?"

Katarea tilted her head, her mind struggling to process his words.

"I said, I've already broken off my engagement with Sona."

"The one before you now, Seekvaira Agares, is my true lover," Akira said, taking Seekvaira's hand in his.

"Seekvaira?"

"The Agares family's Seekvaira!?"

"Your lover!?"

"What!?"

When Katarea exclaimed "What!?", it wasn't because she thought something was wrong with herself—it was because she thought something was wrong with you!

Seekvaira, while maintaining the barrier against the water cannon, calmly replied, "That's right. Akira is my lover."

"If you've come to break off Akira's engagement to Sona, you can leave now."

Though Katarea was a weak Maou, she was still a Maou. Fighting her as a High-Class Devil was putting immense pressure on Seekvaira.

"Hmph! If I leave just because you tell me to, wouldn't that make me look weak!?"

Katarea increased her magical output, and soon, Seekvaira began to falter.

In those ten seconds, Akira had already summoned the Boosted Gear and completed its maximum boost.

With the host's enhanced physique, the Boosted Gear could reach its limit immediately upon activation.

[Transfer! (Gift of the Red Dragon Emperor)]

The green jewel glowed, and Akira placed his hand on Seekvaira's back.

The Gift of the Red Dragon Emperor allowed Akira to transfer the Boosted Gear's enhancements to others.

"This feeling...!"

Seekvaira's magical power surged, effortlessly pushing back Katarea's water cannon!

While a High-Class Devil like Rias might not defeat a Maou-level opponent even with enhancements, Seekvaira was a top-tier High-Class Devil!

"Tch!"

Katarea glared at Seekvaira, her expression darkening.

In the next moment—

"Boom!"

[Dragon Shot!]

A green energy blast shot from Akira's hand, striking Katarea squarely in the face while she was distracted!

"Crack!"

Her red glasses shattered, and Katarea's face twisted with rage.

Without using Balance Breaker, Akira couldn't deal significant damage to Katarea.

But that wasn't his goal.

His aim was to provoke her into losing control!

"Boom!"

Ophis's "Snake" was triggered.

Chaotic energy erupted around Katarea.

Power!

Overwhelming power!

Katarea's magical energy surged to a level that nearly surpassed the limits of a Maou!

The weakened water cannon regained its strength, easily overwhelming Seekvaira's defensive barrier once more.

Note: So far this story is published up to chapter 70 on my patreon go take a look and remember if you reach 110 stones of power I will publish the next chapter.