Crossover-Isekai 115

Chapter 115 Instant Illusion


Edited by: Kanaa-senpai


 Seeing both of her subordinates completely broken and unable to rise, Amano Yuuma gritted her teeth.


 Ignoring the stinging ache in her lower body, she lunged at Aki once more.


 Aki didn’t expect her to come back for more, but since she was practically serving herself up, he wasn’t about to say no to a free meal.


 He stepped toward the girl, whose face was flushed a deep, powdered crimson.


 He grabbed her dainty ankles and forced her sexy legs apart.


 Draping her exquisite, jade-like feet over his shoulders, he began a new round of Dual Cultivation¹.


 After her breakthrough to A-Rank, Amano Yuuma’s endurance was leagues beyond that of Mittelt or Kalawarner.


 The two of them traded blows in their “battle” until nightfall, and even then, Aki hadn’t managed to completely take her down.


 The Flower Valley² was unable to withstand any more of his relentless lashing.


 Amano Yuuma’s cherry lips, her slender hands, her delicate feet, her long legs, and even the pair of snow-white rabbits on her chest were all left sore and spent.


 Only then did the curtain finally fall on their great war.


 Until the very end, it was a stalemate—neither had managed to truly conquer the other.


 Under the restorative power of his Dual Cultivation ability, Aki felt like he could have kept going.


 However, his “Great Dragon” was nearing its limit; the skin was raw, the pleasure had faded, and he was mentally exhausted.


 The nourishment from Dual Cultivation wasn’t a perfect one-to-one transfer.


 After a high-intensity marathon lasting most of the day, Aki knew that if he pushed any further, his legs would give out and his back would scream in protest.


 He felt a twinge of frustration, but he had to temporarily abandon the idea of conquering Amano Yuuma’s heart through her body alone.


 ”Yuuma-chan, I’m heading back for dinner. Let’s do this again soon,” Aki said.


 After a quick cleanup in the bathroom, Aki beat a hasty retreat.


 He hadn’t fully tamed Amano Yuuma yet, and he wasn’t foolish enough to spend the night in the heart of the enemy’s stronghold.


 Besides, after this grueling session, his Mana had surged significantly.


 He’d also unlocked two new Talents, and he needed to go home and digest these gains to truly make them his own.


 Because Amano Yuuma had successfully breached her limits during their union, Aki’s recently acquired Low-Class Fallen Angel Bloodline³ had evolved into a Mid-Rank Fallen Angel Bloodline.


 Furthermore, during the subsequent sessions, he had siphoned a Talent from her called Instant Change.


 The instantaneous wardrobe change he had envied before wasn’t a trick of speed; it was Amano Yuuma’s unique Talent.


 It made sense now why no one else seemed capable of it.


 Aki barely had time to read the description before the system notified him that the new skill had merged with Shinomura Yuki’s Disguise Talent.


 It evolved into something far more potent.


 [Obtained Talent: Instant Illusion]


 [Description: Allows the user to designate three distinct forms and switch between them instantaneously.]


 The Instant Illusion Talent didn’t add a single point to Aki’s combat stats, but its utility left him beaming with joy for days.


 By merging with Shinomura Yuki’s disguise ability, it had become the ultimate tool for running “alt accounts.”


 Amano Yuuma could only swap between two outfits—maybe more, but Aki hadn’t bothered to ask.


 Her version was a seamless clothing swap.


 Shinomura Yuki, on the other hand, had to use Mana to physically reshape her body.


 While her transformation was permanent, the process was agonizingly slow.


 Instant Illusion combined the best of both worlds.


 It came with restrictions, but the advantages were undeniable.


 After some testing, Aki quickly mapped out the limits.


 Including his original form, he could save a total of three templates.


 This meant he had two slots left to “character-create” two completely different identities.


 However, this “face-pinching” had caveats.


 First, the body type could not deviate by more than 15% from his original frame.


 Since Aki stood at 175cm, the Talent could only shrink him to 148.75cm or stretch him to 201.25cm.


 The same applied to weight; at 80kg, his range was strictly between 68kg and 92kg.


 Crucially, that 15% was a shared pool.


 If he used the full allowance on height, he couldn’t change his weight.


 For instance, if he tried to create a “shota” persona at 150cm, his weight would remain nearly 80kg, turning him into a stout little tank.


 The reverse was also true.


 But even a 5% shift in both height and weight is usually enough to make someone look like a completely different person.


 Aki didn’t want a body too different from his own anyway.


 A massive shift in center of gravity would ruin his combat muscle memory.


 Without a long period of adaptation, he wouldn’t be able to fight at full strength.


 Therefore, he didn’t care much about the physical restrictions.


 The real deal-breakers were gender and face.


 He could tweak secondary sexual characteristics—adjusting the chest or hiding the Adam’s apple—but the “primary equipment” downstairs was fixed.


 Aki’s grand dream of infiltrating the girls’ bathhouse was dead on arrival.


 A “trap” with a “Great Dragon” was one thing, but there was no way he was sneaking in there without the proper parts…


 (Anyway…)


 Facial adjustments were limited to a 10% variance.


 It was enough to fool facial recognition software, but anyone who knew him well would still find the “new” face eerily familiar.


 Given Aki’s high starting charisma, even a 10% nerf kept him way above average.


 His plan to create an “ugly” alt to avoid the “Bitter Parent” tropes was officially a bust.


 Despite the limits, it was a godsend for shifting blame onto “someone else.”


 Since he didn’t have any immediate crimes to commit, he simply anchored his two extra slots to his original form wearing two different sets of clothes.


 It effectively duplicated Amano Yuuma’s instant-change trick.


* * *


 While Aki was tinkering with his new toys, Amano Yuuma wasn’t idling either.


 Her original plan had been for the three of them to jump him, drain him dry, and then imprison him as their personal Cultivation Battery.


 After her A-Rank breakthrough, she thought she’d have the upper hand.


 She never imagined Aki’s ability would be so monstrous.


 If she hadn’t leveled up mid-fight, she feared she would have been reduced to a literal human mop by that Great Dragon.


 Even though her mind was still defiant, her body had already memorized the sensation.


 If Aki ever demanded Dual Cultivation again, she knew she wouldn’t be able to say no.


 However, she wasn’t his servant yet—she wouldn’t follow his orders outside of the bedroom.


 The Dual Cultivation had started in the morning.


 By the time Aki left, the pale moonlight was bathing the solitary cathedral on the mountainside.


 Amano Yuuma shook the drowsy Mittelt and Kalawarner awake.


 Her two useless subordinates had been dead to the world since the second round.


 From the afternoon onward, Yuuma had faced Aki’s onslaught alone.


 Having just lost her virginity, she had been pushed to the brink of begging for mercy…


 In truth, she had already begged.


 She just hadn’t fully surrendered her pride to the pleasure yet.


 Instead, she had used the constant influx of energy to stabilize her new rank.


 Once she fully refined the Essence left inside her, her power would spike again.


 The three of them stood in the bath, washing away the thick, sticky evidence of the day’s “battle.”


 Despite the exhaustion, they couldn’t hide their excitement at their massive power gains.


 ”Mitte, Vana… how much further until you hit A-Rank?” Yuuma asked.


 The more she tasted the benefits of Dual Cultivation, the more possessive she became.


 Why should she share such a potent resource with anyone else?


 This was her nature—a black-bellied Fallen Angel, nothing like the soft-hearted Rias Gremory.


 It was exactly why Aki had chosen to treat her as a slave rather than a partner.


 ”If the boost is this big every time… maybe five more sessions and I can attempt a breakthrough,” Mittelt said.


 Mittelt rubbed her slightly bloated belly, trying to circulate the life energy to improve her Mana.


 Kalawarner brushed her impossibly long blue hair aside and nodded.


 ”I’m about the same, but the law of diminishing returns will kick in eventually,” Kalawarner said.


 ”That’s to be expected,” Yuuma explained.


 ”It was our first time, and the gap between our strength and his was significant. That’s why the benefits were so bountiful.”


 A sudden flush appeared on Kalawarner’s fair face.


 ”Even the last few rounds were faster than normal training,” Kalawarner added.


 ”If we… ‘Cultivate’ for two hours a day, his Mana can probably be filled in about a month to attempt the A-Rank breakthrough.”


 —


 Summary:


 Aki engages in an exhaustive Dual Cultivation battle with Amano Yuuma, Mittelt, and Kalawarner. Following the encounter, Aki gains the Instant Illusion talent by merging stolen abilities. He experiments with his new transformation limits while the Fallen Angels plan their next move


 —


 Trivia:


 - Aki’s caution about staying overnight in an enemy base


 - The specific percentage calculation of his height/weight limits


 - The failure of his plan to use the ‘Bitter Parent’ template to hide his good look


 —


 Character Insight:


 Amano Yuuma transitions from a defiant enemy to a physiologically addicted partner, though she maintains her ‘black-bellied’ personality and possessiveness over Aki.


 —


 Glossary:


1 Dual Cultivation: A mystical practice involving intimate union to share and amplify energy.

2 Instant Illusion: A high-tier Talent allowing immediate switching between saved physical templates.

3 Low-Class Fallen Angel Bloodline: The foundational genetic material of fallen celestial beings.

4 Mid-Rank Fallen Angel Bloodline: An evolved state of bloodline granting greater power and status.

5 Instant Change: The innate ability to swap clothing sets without time delay.

6 Disguise Talent: An ability focused on altering physical appearance through mana.

7 Essence: The refined internal energy of a cultivator, distinct from external mana.

8 Flower Valley: A poetic euphemism for the female intimate anatomy in cultivation literature.


Notes:


• Amano Yuuma – Yuuma Amano, also known as Raynare, is a fallen angel disguised as a high‑school girl to observe Aki. She has long black hair, white skin, slender waist, crystalline earlobes, and pitch‑black feathered wings. She wears a revealing black leather outfit covering only vital spots, black leather boots, and exudes a glamorous, provocative aura.

• Amano – Raynare, a fallen angel, poses as schoolgirl Yuma Amano in Kuoh Town. She sports long black hair and a striking figure, using the Amano surname to conceal her true self. Quietly she watches and joins the group; after reaching A‑Rank with Aki she gains a black‑bellied nature and can instantly change clothes, relying on that sensation.

• Yuuma – Amano Yuuma, the human guise of the fallen angel Raynare, is a strikingly beautiful young woman with long black hair, violet eyes, snow-white skin, and a curvaceous, youthful figure, her identity betrayed by two pairs of pitch-black feathered wings and crystalline earlobes. She typically wears a revealing black leather outfit, exuding a “pure yet lustful” aura that masks her manipulative, temperamental nature as a Grigori operative. Once defiant, she now serves Aki with obsessive devotion, her warrior spirit dissolved into yielding ecstasy through Dual Cultivation—her body trembling in surrender on the bed where her transformation unfolds. She wields high-level light magic, seeks power through Sacred Gears and cultivation, and leads her small group with sharp authority, though her loyalty to Aki is absolute.

• Aki – A strikingly handsome A-rank Stray Devil with a powerful, athletic build, black bat wings, a barbed tail, and crimson-flecked eyes. A cold yet strategic Master who commands Fallen Angels, mentors allies, monitors Aisu Academy, and hunts Talents within ORC. Through holy light, Dual Cultivation, and immense stamina, he amplifies partners while reigning with unshakable dominance.

• Kalawarner – Vana, a tall, curvaceous fallen angel with white skin and flowing blue hair, serves as associate to Raynare. She confirms Aki’s cultivation, analyzes diminishing returns, and aims for A‑Rank in a month. Towering over Aki, she bears large round breasts, a hot demeanor, and a dignified, shame‑ridden gaze that yields to desire. Currently weakened by low rank and lack of mana compared to her companions.

• Mittelt – Blonde‑haired, twin‑tailed Fallen Angel in a black‑and‑white maid uniform, jade‑white‑red aura and tiger‑tooth grin. Energetic and complaining, she serves Aki as his maid and works for Raynare and Kalawarner. Present in Aki‑Yuuma’s discussion, she was sent on a mission with a mysterious box but got trapped in Mount Mitsu’s spatial barrier. From fearful observer to vocal, desperate lust during her first sex with Aki, she gains strength by digesting life energy to boost Mana.

• Shinomura Yuki – Shinomura Yuki is a blonde, sharp‑eyed punk with yellow hair and tsundere vibes. Outwardly she appears as a bandaged male thug at Kuoh Academy, but is actually a petite mixed‑blood demon girl. She despises men, uses a Disguise talent that permanently alters her form slowly, merges with Aki’s abilities, joins his group after a magic surge, targets him, and secretly likes the Hamazaki trio.

• Shinomura – Shinomura Yuki, a blonde, sharp‑eyed punk with yellow hair, outwardly appears as a bandaged male thug at Kuoh Academy but is actually a petite mixed‑blood demon girl; her family, the Shinomura line, wields a specialized Disguise talent. She despises men, uses her disguise to join Aki’s group after a magic surge, targets him, and secretly likes the Hamazaki trio.

• Yuki – Shinomura Yuki is a blonde, sharp‑eyed punk with yellow hair and tsundere vibes. Outwardly she appears as a bandaged male thug at Kuoh Academy, but is actually a petite mixed‑blood demon girl. She despises men, uses a Disguise talent that permanently alters her form slowly, merges with Aki’s abilities, joins his group after a magic surge, targets him, and secretly likes the Hamazaki trio.

• Vana – An alias used by Kalawarner, a fallen angel subordinate to Raynare. She often wears a mature, seductive outfit or standard human disguises.

• Rias Gremory – Rias Gremory, a pure‑blood high‑class devil, sports striking crimson hair, blue eyes, a curvy elegant figure in the Kuoh Academy uniform and a large bust. She leads her household’s affairs, governs the school’s hidden hierarchy, and wields top‑level demonic power. The Gremory name is one of the remaining Seventy‑Two Pure‑blood Demon pillars in the Underworld.

• Gremory – Rias Gremory, a pure‑blood high‑class devil, sports striking crimson hair, blue eyes, a curvy elegant figure in the Kuoh Academy uniform and a large bust. She leads her household’s affairs, governs the school’s hidden hierarchy, and wields top‑level demonic power. The Gremory name is one of the remaining Seventy‑Two Pure‑blood Demon pillars in the Underworld.

• Rias – Rias Gremory, 17, tall and curvaceous pure‑blood High‑Class Devil with long crimson hair, crystal‑like crimson eyes, snow‑white skin and a jade‑smooth back; her demonic wings appear in Stray Devil form. As next Gremory head and Kuoh Town administrator, she leads the Occult Research Club, mentors Aki like a big‑sister “Professor,” oversees a peerage, and wields the Power of Destruction as the Crimson Ruin Princess.


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Edited by Kanaa-senpai.
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