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

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"This is... a collar?"

"Akira, why are you putting a collar on me?" Seekvaira was puzzled.

[To synchronize our minds and hearts.]

[Only when our minds and hearts are one can I transfer the key to breaking this situation to you.]

Akira didn't speak, but Seekvaira heard his thoughts through the "pet collar."

"I see, I understand. What do I need to do to receive what you're talking about, Akira?"

"..."

Akira didn't respond, only smiling faintly.

[Seekvaira, while maintaining the spell, kiss me and try to exchange as much bodily fluid as possible.]

A forceful command was transmitted through the pet collar into Seekvaira's body. Before she could react, she was already maintaining the defensive barrier while pressing her lips against Akira's.

"?"

Katarea was stunned.

Who was she? Where was she?

What was happening? Was this still the alternate dimension of the previous Maou faction?

Katarea was initially shocked, but that quickly turned into uncontrollable rage!

What the hell was this?!

First, she was cucked by Serafall, then by Serafall's sister.

Now, she was being cucked by the princess of the Agares family?!

Do you even know how to play the game properly?!

In her fury, Katarea's output increased further.

The water cannon infused with chaotic energy pushed forward, almost shattering Seekvaira's defensive barrier!

But at that moment!

A dazzling white light erupted from Seekvaira and Akira!

[Divide!]

A deep, resonant voice echoed, and Katarea's output was instantly halved!

"Impossible! This power is...!"

Katarea's eyes widened in disbelief.

This was... the power of the White Dragon Emperor?!

How?! The White Dragon Emperor's wings were supposed to be with the Khaos Brigade!

Inside the defensive barrier, Seekvaira and Akira were entangled. Seekvaira's red eyes now had pink hearts in them, completely entranced.

However, Akira remained calm.

Thanks to his training with Hayasaka Nao and Sona, he had developed strong resistance to such situations.

So, while enjoying the softness of the Agares princess, Akira transferred the "Wings of the White Dragon Emperor" to her.

Once the dragon soul bound itself to its new host, Akira used the pet collar to control Seekvaira, making her activate the Sacred Gear!

[Divide!]

The deep voice of the White Dragon Emperor rang out, and Katarea's offensive power was halved again.

Now that she had used the White Dragon Emperor's power, Seekvaira regained some clarity.

Together, the two began to wield the White Dragon Emperor's power!

[Divide! Divide! Divide! Divide! Divide!!!~~]

The White Dragon Emperor's voice echoed repeatedly.

Katarea's "water cannon" continued to shrink, soon becoming nothing more than a "water gun."

"Tch! Damn White Dragon Emperor! What the hell is going on?!"

Frustrated, Katarea had no choice but to cut off her connection with Seekvaira.

After severing the link, Katarea quickly used Ophis's "Snake" to restore her power.

She knew this was going to be a tough battle!

During the gap while Katarea was recovering, Akira and Seekvaira deactivated the defensive barrier.

Now that Seekvaira had gained the authority to use the Longinus "Divine Dividing," she had the power to defeat Katarea!

After Seekvaira confessed her feelings to him, Akira had considered giving her a Longinus.

Using a Longinus as an Ultimate-Class Devil was strong, but not overwhelmingly so.

Only by using a Longinus as a Super Devil could one achieve an invincible stance below the Super Maou level!

However, Akira would never give a Longinus to someone he didn't fully trust.

Even though Seekvaira had confessed to him, in Akira's eyes, she still wasn't entirely trustworthy.

Only those who had established a physical relationship with him, absorbed his Evil Pieces, or worn a pet collar were people Akira could fully trust.

Originally, Akira planned to handle Seekvaira the same way he had handled Sona—by claiming her body and heart before granting her the authority to use a Longinus.

But who could have expected Katarea's sudden intrusion, putting both Akira and Seekvaira in a life-threatening situation?

Such a golden opportunity was impossible to pass up.

So, Akira deliberately triggered the "Snake" within Katarea, creating a crisis that even their combined efforts couldn't resolve.

Under such circumstances, Seekvaira finally agreed to Akira's plan, letting down all her defenses and willingly putting on the pet collar.

Now that his goal was achieved, it was time for Akira to deal with Katarea, who had come looking for trouble!

[Welsh Dragon Balance Breaker!]

[Balance Breaker! 'Armor of the Red Dragon Emperor' (Boosted Gear Scale Mail)!]

Crimson aura surged as Akira donned the armor of the Red Dragon Emperor!

The moment he put it on, he heard the system's notification.

[Ding!~]

[Congratulations, host, for triggering a Villain Check-In!]

[Check-In Level: Gold.]

[Check-In Type: Event Check-In.]

[Check-In Event: The True Leviathan Successor.]

[Requirement: Make Katarea your subordinate, absorb her luck and bloodline using your High-Dimensional Succubus bloodline, and complete the second awakening of your High-Dimensional Leviathan bloodline.]

"Wait, what do you mean by 'second awakening'?"

"Doesn't my current awakening count as the real deal?"

Akira frowned.

After awakening his High-Dimensional Leviathan bloodline, Akira had gained access to chaotic and dimensional energies.

Although he still struggled to use these high-level energies for attacks, they had other effects even without direct offensive use.

For example... boundless stamina and inexhaustible energy. After awakening the High-Dimensional Leviathan bloodline, Akira no longer felt fatigue when using the Boosted Gear.

Another example was his dimensional teleportation ability. Akira could open portals without using any spells, even bypassing any restrictions.

If the first awakening was already this powerful, how overpowered would the second awakening be?

[Ding!~]

[The host's High-Dimensional Leviathan bloodline was formed after absorbing the Leviathan bloodline of this world.]

[By absorbing more Leviathan bloodlines, the host's High-Dimensional Succubus and High-Dimensional Leviathan bloodlines will be further enhanced, and the abilities of this world's Leviathan bloodline will also be awakened.]

[However, only Leviathans with significant luck or the original Leviathan have the ability to trigger the host's 'second awakening.']

[After system analysis, there are only two Leviathan descendants in this world who can help the host achieve a 'second awakening': Katarea Leviathan and Ingvild Leviathan.]

"Katarea Leviathan, leader of the Leviathan faction in the Khaos Brigade."

"Ingvild Leviathan, Issei Hyoudou's queen and wielder of the Longinus 'Rizevim Luminosity.'"

"Compared to Ingvild, whose whereabouts are unknown, Katarea is clearly the more cost-effective option."

Akira narrowed his eyes.

In that case, he couldn't let Katarea escape!

Little did Katarea know that while she saw Akira as a tool for bearing children, Akira saw her as a tool for his second awakening!

Note: So far this story is published up to chapter 70 on my patreon go take a look and remember if you reach 130 stones of power I will publish the next chapter.