Chapter 299 Demon King-class
Edited by: Kanaa-senpai
After the intense release, Katerea fell weakly to the ground. She enjoyed the last feelings of their fierce union. But Aki was not going to let her off so easily.
He kept one hand over the sexy mouth of the dark-skinned beauty. His other arm held her belly. With a hard push, he drove his thick, burning [Great Dragon] back into her. Her hypersensitive [Flower Valley] had just reached its peak.
”Mmmph… Mmmmmmph…”
The aftershocks of the peak came in wave after wave. But the nonstop stimulation continued without a pause. Crystal tears filled Katerea’s eyes. At this point, the extreme pleasure had become a kind of torment.
Her fiery, alluring body instinctively tightened around his. She clamped down on the narrow space. This made the experience for [Little Aki] even more amazing.
After what felt like an eternity, the intensity finally went down. It was replaced by a deep, aching itch from inside.
But Aki seemed to read her thoughts. The [Great Dragon] had been driving in and out wildly. Now, it began to slow down. Finally, it came to a complete stop.
Hungry for more, the dark-skinned beauty had no choice. She wrapped her legs, covered in [Black silk stockings], tightly around him. She began to sway her slender waist and her soft, full hips. She actively took the [Great Dragon] into her, in and out, by her own choice.
The thick, hard [Great Dragon] rubbed against the soft, smooth walls. His burning heat seared her sensitive flesh.
As she pleased the man’s [Great Dragon], Katerea drifted toward another peak. Her [Flower Core] had already reached its peak once. Now, it began to produce fresh streams of warm, clear [Akira’s Honeyed fluid].
Served by this sexy beauty from the south, Aki finally felt the urge to release.
He reached out to hold her plump, beautiful hips. He began to push actively into the wet, slippery flesh of the [Flower Valley].
Katerea’s [Flower Valley] was burning and tight. After hundreds of pushes, Aki felt his [Great Dragon] reach the edge. He was about to release under that intense, tight pressure.
He drove the [Great Dragon] in one last time, deep and hard. A numbing, electric jolt traveled up his spine. He injected waves of hot, thick white [Essence] into the [Flower Palace] (Hanamiya)1. The dark-skinned beauty had long since prepared it.
They had completed one perfect [Dual Cultivation]. Katerea received a belly full of [Life Essence]. Finally, the fire that had burned through her body and soul for nearly a month was put out.
Still, she felt it was not enough. How long could just one round last?
Since she was already here, she might as well eat her fill. She wanted to be completely full.
Being full might be difficult, though. Last time, they had gone on for an entire week. She had been painted inside and out with Aki’s colors. She had been reshaped into Aki’s form. Even then, she had not felt full.
But to eat her fill, to store up more [Essence], and to stay in this state a little longer would be good.
After all, coming to the [Human World] too often was risky. If her subordinates found out, it would be hard to explain.
His special plaything offered herself to him. Aki did not completely refuse. But he did not let her have everything she wanted, either.
After finishing a second [Dual Cultivation], he found something out. He still had not reached the [Breaching Demon King-class]. He noted that a “drug tolerance” might have developed. Because of this, he chased Katerea back to the [Underworld].
It was the first night in a new home. He could not waste everything on this dark-skinned girl.
Before leaving, Katerea returned to her cold, proud way of a female [Demon King].
She was covered head to toe in white, sticky liquid. She wore only a white shirt that reached her waist. Her sexy [Black silk stockings] left her most private parts fully exposed. If not for this, Aki might have praised her acting skills.
As it was, Aki just wanted to pin her down and give her another hard round.
But he saw that glimmer of hope in the depths of her eyes. He quickly stepped on the brakes.
That was close. Who would have thought the simple dark-skinned beauty was so tricky? He had almost fallen for it.
Katerea looked at him with slight regret. Aki formally set their relationship as [Master] and [female dog]. They exchanged contact information. Then, they ended the brief meeting.
By the time Aki returned to the top-floor room, it was not yet midnight.
Katerea’s arrival had been sudden. It had caught him off guard. But one did not need many tricks to handle a [female dog] like her.
Thus, even with two rounds of [Dual Cultivation] and a few small tasks, less than two hours had passed.
Aki told Rias about the Katerea situation through the [Soul Network]. But he told her to keep it a secret for now.
First, the dark-skinned beauty did not want it exposed herself. She seemed to enjoy being a [Queen] in public. And in private, she enjoyed being a [female dog].
Second, Aki needed her to act as a double agent. The [Khaos Brigade] was loosely put together. But it was not something just anyone could join.
He had no conflict with the [Khaos Brigade] right now. But it never hurt to keep a secret weapon ready.
Aki was not a pure genius. But he was no brainless brute, either. All in all, his intelligence was well above average.
As for the last point, he simply enjoyed playing with his special plaything. She was proud and cold in public. But she was lewd and lowly in private.
Rias had not expected Aki’s first plan to actually work. After her first surprise, she quickly agreed to help.
Himejima Akeno and the others trusted Aki, even with their lives. But Rias’s place in their hearts was even higher.
Without Rias, many of them would have died years ago. Or they would have ended up on paths far worse than death.
With Rias’s help, the [Basement] Mana changes were easily hidden.
Someone as smart as Himejima Akeno simply chose to pretend she knew nothing.
The simpler ones, like the blonde [Little Nun], could not see the cover-up at all. Aki and Rias had worked it out together.
With the emergency solved, the night was still young.
It was summer vacation. There was nothing to do during the day. So, it was natural to stay up all night.
Aki lay on the large bed. He called Rias, Himejima Akeno, and Amano Yuuma (Raynare) to come up. He continued to help the three of them with [Cultivation]. He pushed to have them [Breaching] to [SSS-Rank] as soon as possible.
After a night of hard work, the excitement of moving was finally let out. The heat stirred up by Katerea was also finally vented.
Furthermore, Aki had worked hard for many days. That night, Rias successfully [Breaching]. She became the second [SSS-Rank] powerhouse in the Occult Research Club after Aki.
…
The one-month summer vacation slowly slipped away. One breakthrough followed another. Himejima Akeno and Amano Yuuma (Raynare) followed soon after.
The full moon of August arrived. Koneko, Mittelt, and Kalawarner all successfully signed a [Soul Contract] with Aki.
Aki looked at the large bed. The three bodies were tangled together. One was tall, and two were small. They were all fair and alluring. He let out a breath of satisfaction.
Two-thirds of the nine [Soul Contract] slots had been used. But the effects were truly strong.
Just last night, he completed the [Soul Contract] with the tall, slender Kalawarner. The feedback of energy helped him break through an invisible wall. He formally stepped into the [Demon King-class].
If he had not [Breaching] now, Aki was ready to start finding a way to contact Grayfia.
Or, while there was still time left in summer vacation, he might have used an excuse. He could visit our dear [Student Council President] in the [Underworld]. Then, he could see if there was a chance to deepen his bond with a certain [Demon King]. She liked to [COSmagic Schoolgirl].
…
After [Breaching Demon King-class], Aki did not feel much change.
It was just an increase in [Mana] volume and a better physical body. As for whether he remained unbeatable at the same level, he had not had the chance to test it yet.
However, after [Demon King-class], he could use the [Boosted Gear’s Balance Breaker] mode freely. If a real fight broke out, taking on five or six at the same level was easy. A one-versus-two was sure to be no problem.
He kept using the [Dual Cultivation Ability] to rapidly gain power. It would not be long before he reached [Super-Devil]. Then, he would recover his absolute strength to take on many at the same level.
Aki did not care much about it. But his [Breaching Demon King-class] had a much deeper effect on Rias and the others.
The boosted effect and speed during [Dual Cultivation] were huge. The rich life energy was also huge. Now, each session was worth three or four times what it used to be.
That was for Rias and the others who were already [SSS-Rank]. The weaker ones, like the [White-haired loli] and her group, felt a different way. They felt like they could not even digest Aki’s [Essence] anymore.
After each [Dual Cultivation], they had to rest for several days.
They could not possibly do another round of [Dual Cultivation]. Not until they fully absorbed the [Life Essence] filling their bellies.
After all, every time his [Great Dragon] entered and pulled out, it left a sticky trail. Aki found it slightly unpleasant. And the girls were also terribly uncomfortable from being stuffed so full.
However, for the girls with even less power, like the Takamine daughters, it did not make much of a difference.
Because from a long time ago, they had been unable to digest Aki’s life energy.
They could only gain benefits from the process of each [Dual Cultivation]. But even these benefits were limited by the natural top level of their own talent.
Aki’s strength kept increasing. Because of this, some ideas began to pop up in his mind from time to time.
For example, he could get a strong and useful [Familiar]. Or he could put together his own Valkyrie guard unit…
Hmm, the second point was a thought that suddenly popped up. It happened when Sun Wukong appeared and mentioned the Northern [Norse God-faction].
—
Summary:
Aki engages in sexual activity with Katerea, who is established as his submissive plaything and secret double agent. Following the encounter, Aki focuses on cultivating with his harem, successfully reaching the Demon King-class power level. He contemplates future power plays, including acquiring a Valkyrie bodyguard unit as he expands his influence across the Underworld and Human World.
—
Trivia:
Katerea is serving as an informant within the Khaos Brigade.
Aki possesses a specific Dual Cultivation ability that functions as both a pleasure mechanism and a power-leveling catalyst.
Rias is the second member of the Occult Research Club to reach SSS-Rank.
Aki has consumed two-thirds of his nine available Soul Contract slots.
The author explicitly notes that the version of Valkyries used in the story refers to a bodyguard unit rather than a singular entity.
—
Translation Notes:
Notes:
• Katerea – A tall, slender Demon King-class beauty from the Leviathan clan with dark skin and long, silken dark-gold hair. Publicly, she maintains a haughty facade and formidable presence, but behind closed doors, intense conditioning has broken her pride. She is now a submissive plaything bound in quiet obedience to Aki, returning home stronger than before as a testament to her fallen glory.
• Aki – A tall, handsome Kuoh Academy strategist and King-status devil with a powerful, dragon-like physique and scumbag-like charisma, he wields Dual Cultivation and soul contracts to heal, empower, and psychologically condition his growing harem of schoolgirl knights and supernatural companions. A master of magical tool control and Evil Piece distribution, he pragmatically expands his peerage while indulging his immense sexual stamina and appetite, balancing flirtatious charm with dominant control as he ascends toward Demon King-class power.
• Akira – A blonde, arrogant SSS-Rank strategist for the Naruse sisters, he wields the Boosted Gear, Soul Covenant, and Dual Cultivation. Connected to the yakuza and ORC, this unstable youth uses his Underworld knowledge to protect allies while building a contract harem. Driven by envy and a quest for revenge against Aki, his growth-oriented yet volatile nature ultimately leads to a tragic downfall.
• Rias – Rias Gremory, a striking SS+ high-class devil heiress with crimson hair, blue eyes, and porcelain skin, is the head of her household and Master of Kuoh Town. As the confident, authoritative leader managing local supernatural affairs, security, and peace negotiations, she guides her peerage, mentors Aki, and maintains formal etiquette. She is tied to Sirzechs and Sona, and acts as Aki’s accomplice.
• Queen – A devil serving Riser Phenex.
• Himejima Akeno – A high-ranking member of the Gremory peerage and household, this buxom female student with black hair in a ponytail assists Rias with magical tasks. Known as the Lightning Flash, her previously reserved demeanor has shifted into a sultry, energetic, and passionate personality during cultivation, maintaining close ties as a supportive ally to her companions.
• Himejima – Akeno Himejima is a tall, curvaceous Kuoh Academy senior and high-ranking Devil retainer in Rias Gremory’s peerage, bound by a Soul Contract to Aki. With long black hair and a poised, queen-like demeanor, she exudes refined grace and sadistic charm, wielding golden lightning and mastering advanced magic. Deeply loyal to Rias, she guides Aki with teasing warmth, balancing her powerful presence with maternal authority and unwavering devotion within the Gremory household.
• Akeno – Himejima, a tall, voluptuous Orc-devil shrine maiden with raven hair, red eyes, and dark wings, is the “Priestess of Thunder.” As Rias Gremory’s loyal S+ rank Queen and Vice-President, she gracefully manages administration. Beyond her combat prowess, she is the soul-bound contract partner of Akira, maintaining a deep, affectionate bond with him and constantly longing for his attention.
• Amano Yuuma – Yuuma Amano is the alias of Raynare, a Fallen Angel disguised as a school uniform-wearing transfer student with a pure, innocent face, a devilish, slender figure, long black hair, and black wings. She serves in Rias’s Peerage, the ORC, and a barrier maintenance team. Possessive, assertive, and proactive, she takes the lead in training her partner Aki, with whom she desires intimacy.
• Raynare – Lady Raynare, alias Yuuma, is a voluptuous, dark-haired former Fallen Angel training under Rias in the Occult Research Club. Shifting between an innocent schoolgirl guise and her true nature, she is contracted to her mentee, Aki, boosting her combat strength to high-end S-Rank. Though struggling to fully integrate as a peerage member, she provides vital insight into current combat dynamics.
• Amano – Raynare Yuuma, a fallen angel masquerading as a Kuoh schoolgirl, is a striking woman with long hair and a commanding presence. Secretly a Devil bound by a Soul Contract to Aki, this former Occult Research Club member possesses black-belly powers and instant-change abilities. She conceals her true faction and fears, remaining a disciplined, protective figure deeply concerned for Aki’s well-being.
• Yuuma – Amano Yuuma (Raynare) is a striking, curvaceous high-class devil, light magic master, and devoted Pawn in Aki’s peerage, bound to him by a profound soul contract. Formerly a fallen angel, Grigori operative, and involved with the local Fallen Angel trio, she has long black hair and violet eyes. Known for playful teasing, she holds an obsessive, fierce devotion and absolute allegiance to Aki.
• Y – The first initial/part of the name Y Ddraig Goch.
• Kalawarner – A tall, voluptuous, fair-skinned fallen angel turned Devil with emerald eyes and blue hair. Wearing glasses and professional attire, this intelligent yet insecure S-Rank fighter serves as a strict, playful Kuoh Academy English teacher and household consultant. She assists Yuuma, acts as a loyal, sisterly figure to Aki—with whom she signs a Soul Contract—and competes with Mittelt in Rias’s peerage.
• Mittelt – A petite, twin-tailed blonde Fallen Angel turned Devil in Rias’s peerage, sporting jet-black wings, light powers, a jade-white-red aura, and a black-and-white maid uniform. Formerly serving Raynare and Kalawarner, this sharp-tongued, impulsive S-Rank fighter transferred to Aki’s training group, signing a Soul Contract with him. She craves Aki’s affection and playfully teases younger members.
• Koneko – A sixteen-year-old Nekoshou with white hair, cat features, and a petite, doll-like physique, this stoic girl serves as Rias Gremory’s Rook and a combatant in Aki’s group, with whom she signed a Soul Contract. Recently injured in battle, her usual impassive restraint yields to magical resonance during a tough gym fight, making her deeply affectionate with Aki and prone to jealousy.
• Grayfia – The strongest Underworld Queen and Sirzechs’ wife/secretary, she is a dignified, silver-haired head maid serving the Gremory house with iron willpower. Composed yet seductive, this high-ranking Devil authoritatively executes the Demon King’s wishes. Using her Demon King-class power, she acts as a medical examiner, barrier dismantler, and referee, and collaborated with Aki to create a specialized drug.
• Takamine – Kasumi Takamine, a widowed matriarch, mentors her adopted son Aki in magic mastery. Alongside her tall, voluptuous daughters Ayame and Sayuri—now Gremory corporate partners—she helps Aki lead their organization under his spiritual leadership. Together, they made their home an intimate, liberal sanctuary, deeply rooting Kasumi’s influence in both family, leadership, and their managed organizations.
• Wukong – A short-haired youth who wields a staff and possesses a confident, relaxed, and slightly arrogant demeanor.
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Edited by Kanaa-senpai.
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