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

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"Mmm... Mmm?"

Irisviel's body shifted slightly, pushed by Maiya Hisau from lying on her side to lying flat on her back.

"Maiya..."

Pop~

The sound of a cork being pulled echoed softly.

Irisviel, sensing a change in herself, opened her eyes in confusion. What she saw was Maiya Hisau, clad in a tight black bodysuit.

Initially, Irisviel had thought of Maiya as a cold-blooded assassin, given that she was Kiritsugu Emiya's senior. But now, she realized that the more reserved a person appeared on the surface, the more twisted they might be in private.

Compared to Irisviel, who was passively enduring, Maiya, who was actively expressing her emotions, was far more shocking. How had she never noticed this girlish side of Maiya before?

Maiya held a cross in one hand, her eyes teary and her whites showing. Her toes curled and uncurled, almost tearing through the black stockings beneath her tight pants.

"Lord Akira, I've heard some things about you from Natalia."

"Please... grant me your piece as well."

"I want to stay by your side... forever."

Maiya clung tightly to Akira, pleading with him. It was just like the little girl on the battlefield who had once begged to stay by his side.

Akira remained silent, simply pulling out a black "Pawn" piece.

As the black "Pawn" piece merged with Maiya, her physique underwent an evolution.

Ding~

[Detected energy absorption. High-dimensional succubus bloodline activated.]

[Energy absorption target: Maiya Hisau.]

Ding!~ Energy absorption successful.

[Host level increased by 6. Current level: 196 (Peak High-class Devil).]

Ding!~

[Congratulations, host, for completing a Villain Check-in!]

[Check-in level: Silver.]

[Check-in type: Event-based.]

[Check-in event: Corrupting a Demon (Maiya Hisau).]

[Congratulations, host, for receiving the reward: Blessed Holy Cross.]

[Blessed Holy Cross: A cross capable of replicating and housing a portion of the host's power. With time and effort, it can theoretically be produced infinitely. The replicated power will be two levels lower than the original. For example, if the host can exert the power of a Maou, the Blessed Holy Cross can only house the power of a High-class Devil. Additionally, a single Blessed Holy Cross can be imbued with multiple abilities. In theory, possessing one Holy Cross makes the bearer a significantly weaker version of the host. Note: Since the Blessed Holy Cross requires the host's original power to create, anyone wearing it will gain increased resistance to fate, making them less susceptible to the world's corrective influences.]

"The Blessed Holy Cross..."

Seeing this reward, Akira became even more convinced of one thing: the system's rewards were not random. They were tailored to his current situation and needs.

Previously, Akira had been pondering how to resist the world's corrective forces and ensure that he wouldn't be cuckolded when he left. To this end, he had even placed restrictions on Maiya and Irisviel.

But now, he had obtained the "Blessed Holy Cross," which granted resistance to fate. With this, many of his plans would become far easier to execute.

"Maiya... let me give you a gift."

Akira reached out, touching the cross on Maiya's chest.

Hum~

A golden light flickered.

In moments, the cross on Maiya's chest transformed into the "Blessed Holy Cross."

Since Akira had only temporarily enhanced the "healing" power, the process took mere seconds.

Maiya sat up, holding the now more sacred and intricately designed cross, feeling an unprecedented sense of security.

This time, Akira wouldn't leave her, right?

"Lord Akira..."

"From now on, please allow me to stay by your side."

Maiya quietly rested on Akira, absorbing more of the sense of security he provided.

She had always been a woman lacking in sense of security. It wasn't until Akira's arrival that her insecurities were filled, leaving her feeling overwhelmingly happy.

Watching Maiya cling to Akira, Irisviel couldn't help but think: Wait, is this... cuckolding?

Just moments ago, this spot had been hers. But after a brief nap, it had been taken over. Couldn't they have waited at least until today was over? Didn't they understand the concept of cuckolding?

No... wait.

Irisviel suddenly realized something.

It seemed... Maiya had been here first.

So, it wasn't that she had been cuckolded, but rather... she had cuckolded Maiya?

And so, Akira enjoyed the company of two women with completely different auras—one black, one white.

After all, he hadn't transmigrated for nothing. As a energy plunderer, Akira had a natural desire for the heroines of these anime worlds.

His desire stemmed from two sources: first, his collector's instinct as a transmigrator. Having seen so many beautiful heroines in his past life, now that he had transmigrated, he naturally wanted to claim them. Otherwise, what was the point of transmigrating?

Second, it was the instinct of a "high-dimensional succubus."

Plundering energy, strengthening oneself, and conquering worlds were the ways of a high-dimensional succubus. Conquering heroines was merely a means to conquer the world.

Of course, there were other ways to conquer a world, but this was Akira's favorite method. That was all.

While Akira was enjoying himself, subtle changes were occurring across the world cluster.

After being teleported into the dimensional rift by Akira, Gilgamesh had no choice but to go all out, using Ea to stir the fabric of space-time in hopes of reestablishing his connection with Kirei Kotomine.

Having not been summoned back by Kirei for so long, Gilgamesh could only think of one possibility: he was beyond the range of the Command Seals.

Thus, Gilgamesh piloted his Vimana, protected by the Gate of Babylon, and began causing chaos within the dimensional rift.

As he wreaked havoc, the dimensional rift underwent a strange transformation.

"Hmm? What is this...?"

Gilgamesh saw a massive darkness enveloping the world cluster, spreading rapidly.

"I see..."

Gilgamesh stroked his chin, a pleased smile spreading across his face.

"The world's consciousness has been expelled. With no one left to protect this world cluster, the minions of the outer gods and dimensional creatures are beginning to stir."

No, it wasn't that they were beginning to stir.

Rather, due to Gilgamesh's meddling with space-time, the outer gods' minions and dimensional creatures were on the verge of erupting into chaos!

These minions and creatures were not being controlled by anyone.

The outer gods' minions were extensions of the outer gods' will, expanding outward. However, as long as the outer gods themselves were not actively awakened, their minions would only expand aimlessly.

As for the dimensional creatures, they were even simpler.

These beings, born in the dimensional gaps, had no self-awareness. They only instinctively attacked any life forms around them, devouring everything in the dimensional void, breaking down world fragments, and digesting the remnants of destroyed worlds.

"Things... are getting more and more interesting."

Gilgamesh's smile widened.

He had no intention of stopping this.

On the contrary, he wanted to stir up more trouble, to annoy the demon who sought to conquer this world.

"Perhaps I should unleash a great flood to filter humanity... That wouldn't be a bad idea."

"Let's see how many of today's humans can survive the flood and become the true humans of the new era."

And so, Gilgamesh continued to stir the fabric of space-time.

Until—at some point, after disturbing a particular part of space-time—he finally reestablished his connection with Kirei Kotomine.

Whoosh~

In an instant, Gilgamesh's figure vanished from the dimensional rift.

All that remained were... the outer gods' minions and dimensional creatures, now roused to fury by the spatial storm.

Meanwhile, back with Akira...

Maiya was demonstrating her knightly spirit, steadfastly holding her ground.

But the next second, the door burst open, and Saber rushed in.

"Akira! Something's happened!"

"Hmm?"

Akira raised an eyebrow, setting aside Maiya, who had stiffened and rolled her eyes at Saber's sudden entrance.

Glancing at the bloodstains on Saber's holy sword, Akira deduced that Saber had emerged victorious from her battle with Lancer.

Of course.

With her Noble Phantasm exposed, Diarmuid Ua Duibhne stood no chance against Saber.

Diarmuid's defeat was no surprise to Akira.

What surprised him was Saber's reaction.

In Akira's memory, Saber wasn't one to easily lose composure.

What could have happened to make her burst in so urgently, not even showing a hint of embarrassment upon seeing him and Maiya in their current state?

"What's happened?" Akira asked calmly.

"Something major... this world has been invaded by the minions of the outer gods!" Saber replied gravely.

"Hmm? The minions of the outer gods?"

Akira raised an eyebrow. Well, well, the minions of the outer gods?

Saber couldn't be referring to the already defeated Cthulhu-like sea monster, could she? It must be something else.

Whoosh~

A flash of light, and a crystal ball used for surveillance projected an image.

Soon, Akira surveyed the situation in several cities.

Just as Saber had said, many cities were now infested with sea monsters, along with other bizarre creatures.

Since they carried dimensional energy, Akira classified them as dimensional creatures living in the gaps between dimensions.

"The outer gods first established a connection with this world through the giant sea monster, so they must have instinctively sent similar forces afterward."

"It seems the outer gods are only expanding instinctively, with no intention of directly invading."

[I agree.] Agumon's voice came through their contract.

[If they intended to invade, the outer gods wouldn't use such peaceful methods. So, we can only conclude that this is the minions' instinctual expansion.]

Agumon, who had memories of her (mother goddess) exploring other worlds, knew how these otherworldly beings typically operated.

"Do the outer gods' minions carry their power?" Akira mused, stroking his chin. He had an idea.

[Yes, the invading sea monsters carry the power of the outer gods.] Agumon replied.

[Though their energy is weak, if they keep devouring each other, they could cause significant disaster.]

[Of course, even if they fused into a giant sea monster, it wouldn't compare to the Cthulhu Dragon we defeated earlier. That one was special, carrying a trace of both Alaya and the outer gods' power.]

[Akira, what should we do? If I intervene, I can use area spells to quickly eliminate these invaders.] Agumon's desire to act was strong.

"No, that won't be necessary."

Akira shook his head.

[What do you mean... it's not necessary?] Agumon didn't understand.

"Agumon, we don't need to eliminate these invaders."

"Instead of destroying them, it's better to make them our allies."

[Make them... our allies?]

Agumon tilted her head.

She understood the words, but she didn't know how Akira planned to achieve this.

Just then, Akira heard the system's notification.

Ding!~

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

[Check-in level: Gold.]

[Check-in type: Event-based.]

[Check-in event: Expel the Invaders.]

[Requirement: Completely eliminate this wave of invading outer gods' minions and dimensional creatures.]

[Due to the turmoil in the dimensional gaps, rifts have formed, allowing the outer gods' minions and dimensional creatures from outside the world to invade spontaneously. If left unchecked, this world cluster will either gradually collapse, becoming nourishment for the dimensional gaps, or be overrun by the outer gods' minions, eventually leading to the arrival of the outer gods themselves.]

[To prevent such an outcome, they must be sent back to where they came from. After all, why let others feast on what you've carved out for yourself?]

"Expel the invaders? That suits me just fine."

In Akira's eyes, both the sea monsters and the dimensional creatures were valuable resources.

The sea monsters could help his Sea Dragon Beast grow stronger.

The dimensional creatures also had their uses.

Such useful resources would be wasted if simply destroyed.

However...

To Akira's surprise, the system continued to issue notifications.

Note: So far this story is published up to chapter 120 on my patreon go take a look and remember if you reach 130 stones of power I will publish the next chapter.