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

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===

On the other side.

Just as Akira closed the student council door, he heard the system's notification sound.

[Ding!~]

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

[Check-in Level: Colorful]

[Check-in Type: Stage Event Check-in.]

[Check-in Event: The Old Maou's Conquest of the Current Maou.]

[Requirement: Dominate Serafall Leviathan and Sona Sitri both physically and mentally, marry them, and succeed as the Maou, completing the Old Maou's glorious counterattack against the Current Maou.

Note: Sona is silver, Serafall is gold. Marrying both and succeeding as Maou will reward you with a Colorful-level reward.]

...

"As expected of a Colorful check-in, the difficulty is not low."

"However, even without this check-in task, this is a goal I must achieve."

"Hmph~ You think you can use me as a tool and then run away?"

Akira had always been very intrigued by the phrase in Serafall's profile: "Her bloodline has been purified to the extreme, resulting in an evolution."

Although there was no concrete evidence, Serafall most likely benefited from his influence to become stronger than in the original storyline!

....

As soon as Akira triggered Sona's task, the student council door behind him suddenly swung open.

"Akira-kun!"

Sona rushed out of the student council room and hugged Akira tightly!

"Akira-kun, you just said you were confident you could defeat my sister, right?"

"That's correct."

"Then, is it you or your Agumon who is confident in defeating my sister?"

Sona had found the loophole. Akira had not mentioned anything about Agumon earlier!

If Akira dared to say this, it meant his own strength was far beyond what he had shown!

"Is it me or Agumon who is confident...?"

"Both Agumon and I are confident in defeating Serafall," Akira answered truthfully.

"Good!"

"Then, Akira-kun, please show me this confidence!" Sona's eyes were filled with determination.

She wanted to see just how far Akira could go!

.....

A few minutes later, on a grassy field.

Shinra Tsubaki adjusted her glasses and watched as Sona and Akira faced each other.

Sona, as her "King," had keenly noticed that Akira had been hiding his true strength.

However, a question arose.

If he had been hiding his strength before, why was Akira revealing it now?

Had he achieved his goal, making it unnecessary to hide anymore?

What was Akira's goal, then?

To break off the engagement with Sona? Or to marry Rias?

Akira: My goal? Of course, it's to get engaged to Rias! Getting engaged to Rias and getting engaged to Sona are two completely different things. Being engaged to Rias allows me to freely use my power. Being engaged to Sona means I can't show strength surpassing hers.

As Shinra Tsubaki pondered this, she observed the battle between Akira and Sona.

....

"Sona, if I win, I want you to become my ally and help me change the system of the Underworld."

Akira raised his left hand and spoke slowly.

"No problem, Akira-kun. Our dreams don't conflict."

"Moreover, I would be delighted to witness the process of you changing the Underworld."

Sona nodded, preparing herself.

The next moment.

[Boost!]

The Red Dragon Emperor's Gauntlet appeared!

Crimson aura erupted!

The green jewel shone with dazzling light!

[Welsh Dragon Balance Breaker!]

[Forbidden Move! — 'Red Dragon Emperor's Armor'! (Boosted Gear Scale Mail)]

The crimson dragon armor instantly materialized!

...

"Such immense spiritual power!"

Sona's beautiful eyes widened, ripples of astonishment reflecting in them.

Such powerful dragon spiritual energy had surpassed that of a high-class devil, reaching the level of an ultimate-class devil!

Is this what Akira-kun had been hiding!?

"Akira-kun, this is...?"

Sona swallowed hard and asked.

"This is the Balance Breaker form of the Longinus, 'Boosted Gear,'" Akira replied calmly.

"A Longinus...!"

Sona couldn't hide her surprise.

After regaining her composure, Sona unconsciously curled her lips into a smile.

Akira-kun truly was Akira-kun. He had thought of using a Sacred Gear to strengthen himself before she did!

While she was still in the planning stage, Akira had already put it into practice and even unlocked the Balance Breaker of his Sacred Gear!

He truly was the Akira-kun she admired!

"Haaaah!~~"

Sona raised her hands, and powerful water magic surged.

The Sitri family's exclusive magic circle quickly formed.

A torrent capable of crushing mountains shot forward!

There was no resistance.

The water torrent directly struck the Red Dragon Emperor's Armor!

"Sizzle!~"

Akira stood firm, allowing Sona's water to wash over the armor.

[Name: Akira (♂)]

[Level: Lv184 = Lv99 + 85 (High-tier Ultimate-class Devil)]

[Attribute Evaluation]

[Note: Strength within the same level.]

[Strength: B]

[Speed: B]

[Magic: B+]

[Physical Defense: B]

[Martial Arts/Magic Proficiency: C]

[Sacred Gear/Bloodline Ability: SS+]

[Comprehensive Evaluation: B-class Ultimate-class Devil]

[Overall Rating: Slightly above average.]

Since he needed to be compared to opponents of the same level, Akira's attributes had dropped slightly.

However, even so, Akira was a genuine ultimate-class devil!

In fact, he was among the best of them!

.....

"Haaaah!~~"

Sona didn't give up and used the same giant water sphere she had used against Agumon.

"Whoosh!~"

The massive water sphere carved out a hundred meters of ground!

But in the huge crater, Akira remained unharmed!

Sona's attack was powerful enough to alter the terrain, but it still couldn't harm Akira!

After all, water was just water!

And Akira was a rock! Their mass and density were completely mismatched!

The Red Dragon Emperor's Armor had incredible defensive capabilities, capable of blocking most attacks from opponents of the same level.

Let alone an opponent one level lower.

....

For several minutes, Shinra Tsubaki calmly watched as Sona unleashed various attacks.

Soon, after using all her techniques, Sona raised her hand.

"Akira-kun, I concede."

Surrendering to a Longinus user who had unlocked Balance Breaker was not something Sona considered shameful.

.....

Student Council Room.

Soon, Akira and the others returned to the student council room.

"Akira-kun, the engagement has been annulled."

"From now on, we are no longer engaged."

Before the battle began, Sona had torn up the engagement contract in front of Akira.

Now, she and Akira were no longer engaged.

But... she felt that the distance between her and Akira had grown closer.

She understood Akira better now, and the distance between their hearts had narrowed significantly.

"Whew~"

Sona let out a long sigh, stood up, and walked over to Akira. Her eyes carried a hint of resolve.

"As a farewell gift, Akira-kun, can you kiss me?"

As she spoke, Sona's face turned an unprecedented shade of red, and her slender, pale hands fidgeted nervously.

For a proud devil princess like Sona, confessing and saying such things had already exhausted all her courage.

"..."

Akira didn't say anything, only nodding silently.

"..."

Seeing Akira nod, Sona's lips curled into a smile.

After mentally preparing herself, Sona slowly sat on Akira's lap and held his hands.

For devils, strength was the best aphrodisiac.

Moreover, even before knowing Akira's true strength, Sona had already been unable to resist.

"Sona..."

Akira placed one hand on Sona's slender waist, moving upward, while the other hand reached for the hem of her skirt.

Men and women were different. Men often couldn't control their hands during intimate moments.

"Akira-kun, you're a bad person."

Sona felt Akira's movements, her heart racing like never before. Her body was producing estrogen in preparation for bearing offspring.

She knew that if this continued, she wouldn't be able to hold back.

It wouldn't just stop at a kiss.

But...

From the beginning, she had no intention of holding back.

Akira's golden eyes met Sona's pink ones.

The next moment, the distance between their faces narrowed to just a few centimeters.

Their gazes intertwined, tender as water.

Their bloodlines merged, fierce as fire.

On the sofa.

By the bookshelf.

On the student council desk.

Akira savored the taste of the Underworld's princess.

[Ding~]

[Detected that host is seizing destiny. High-dimensional Succubus Bloodline activated.]

[Ding!~]

[Congratulations, host, for obtaining: Pure-blooded Sitri Bloodline (unawakened or mutated).]

[Host's level increased by 10. Now at Lv109 (Low-tier High-class Devil).]

"The High-dimensional Succubus Bloodline can also increase levels?"

"Then why didn't it work when I was with Hayasaka Naoto...?"

[Ding!]

[Hayasaka Naoto's destiny was absorbed by the host during childhood.]

[In addition to absorbing destiny and enhancing cheat-like abilities, the High-dimensional Succubus Bloodline can also replicate and enhance bloodlines.]

[The more connections with the bloodline source, the greater the enhancement for both parties.]

"I see. As expected of the High-dimensional Succubus Bloodline."

Akira narrowed his eyes. Intimate contact with anime heroines not only increased experience but also strengthened his foundation. Was this encouraging him to conquer the entire Underworld?

Indeed, the High-dimensional Succubus Bloodline's effects weren't limited to attracting the opposite sex.

[Ding!~]

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

[Check-in Level: Silver]

[Check-in Type: Stage Event Check-in.]

[Check-in Event: The Old Maou's Conquest of the Current Maou (Stage 1).]

[Congratulations, host, for obtaining the reward: Divine Authority — Silver Arm That Tears Apart.]

[Silver Arm That Tears Apart: A divine authority from the god Nuada. When activated, the flesh hand transforms into a silver metallic hand, enveloping a weapon with immense cursed power, granting it the miraculous ability to split the earth, alter terrain, and part the seas.

In theory, using the Silver Arm That Tears Apart, one can wield a demonic sword capable of cutting through anything. The object doesn't need to be a sword; even a toothpick or branch can become a demonic sword.]

.....

Although he had obtained an excellent offensive ability, Akira didn't pay too much attention to the system's rewards.

He was busy dealing with Sona.

Sona was a formidable opponent.

Although both Sona and Hayasaka Naoto were high-class devils, the physical differences between a reincarnated devil and a pure-blooded devil were vast.

How could a recently reincarnated devil compare to a high-class devil nurtured by a pure-blooded lineage for over a decade?

....

Thus, today, both Akira and Sona skipped class.

Noon.

Student Council Room.

Sona sat on Akira's lap, her hands clasped with his.

The bespectacled girl gently bit her rosy, alluring lips, her lips curving into a sweet smile, her dimples showing.

Feeling Akira's pulse, Sona's rhythm gradually synchronized with his.

Before long, Sona felt a new surge of energy.

This energy felt both familiar and foreign.

It somewhat resembled Leviathan's magic, but overall, the similarity was minimal.

After a morning, Sona's hair was disheveled, and her usually noble and cold face was now flushed and radiant.

The princess of the Underworld gazed quietly at the young man beneath her, her watery pink eyes filled with submission and satisfaction.

Sona was very satisfied.

Whether mentally, physically, or in her lower abdomen, she was so satisfied that she felt she might overflow.

"Akira-kun, do you know why I did this?" Sona asked softly.

"Because..."

Before Akira could finish, Sona answered first.

"Because I no longer plan to marry anyone else, so maintaining my chastity before marriage no longer holds any meaning."

"...."

Akira didn't say anything, only reaching out to stroke Sona's sweat-dampened black hair.

"Akira-kun, I did this to give you more pressure, too~"

"Akira-kun, you must come to the Sitri family to marry me."

"Otherwise, I'll never be able to marry anyone else," Sona pouted, reminding him.

"I know. What I promise, I will fulfill."

Akira smiled lightly.

Although he felt no pressure, he would indeed work hard to keep his promise.

What pressure could Akira have?

As the successor of the Old Maou Leviathan, he had conquered the younger sister of the Current Maou Leviathan. Such a thing only filled him with a sense of conquest and immense satisfaction.

Compared to pressure, Akira was more concerned about danger.

Compared to the pressure of being intimate with the princess of the Underworld, the potential dangers of lacking strength and influence were what truly worried Akira.

Now, anyone who wanted to move against him would have to consider Serafall, who stood behind Sona.

So, compared to the time when he was thinking of running away, the current Akira truly felt no pressure.

"Mhm, Akira-kun, I believe in you."

Hearing Akira's promise, Sona swayed her hips, expressing her approval.

....

Note: So far this story is published up to chapter 42 on my patreon go take a look and remember if you reach 40 stones of power I will publish the next chapter.

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