Chapter Text
After helping rebuild Ninja Village, a weary Ash continued his journey through the mountains, stopping to rest at a small, secluded, family-owned onsen. Deciding he could use some relaxation, he stripped down and washed himself at the bathing station. Upon opening the door to the outdoor bath, he noticed there were already several other patrons soaking in the hot water: boys and men of various ages, sizes, and occupations. A few looked up to admire the aspiring Pokémon Master’s handsome features, his tan, smooth, muscular body, and his limp yet girthy cock. Ash smiled a little awkwardly and stepped into the hot spring. As he eased himself lower, the hot water rose up to his big pecs, immersing him in its healing properties. He leaned back, closed his eyes and sighed, letting his sore muscles finally relax.
One of the patrons, an older, balding man, with a large belly which belied his sedentary office job, kept his eyes on Ash. He exchanged glances with a young, slim schoolboy, who was also staring at the fit hero.
“What’s yer name, son?” the office worker asked in a gruff voice.
Ash opened his eyes and looked around.
“I’m talking to you,” the office worker said impatiently, making intense eye contact with Ash.
“Oh, sorry! I’m Ash Ketchum from Pallet Town.”
“Ash Ketchum, huh?” the office worker rolled the name on his tongue, sounding it out, probing the consonants with an uncomfortable intensity. “What’re ya doing all the way out here?”
Ash paused, unsure how to reply. How could he explain everything he’d just been through at the Ninja Village and on Otori Mountain? Tied up in various excruciating positions, forced to bond with his beloved Greninja, enslaved by a power-hungry master ninja, used over and over again by a ninja cult…not to mention he wasn’t sure if he was even allowed to talk about Ninja Village to strangers. Deflecting, he simply said, “I was visiting a friend. You see, I’m on a journey to become a Pokémon Master, so I end up all over the place!”
“Pokémon Master?” the slim schoolboy piped up. “That sounds so cool!” The boy used the opportunity to wade over to Ash.
“It’s the coolest! Pokémon are so awesome.”
The schoolboy stopped inches in front of Ash. “Wow, your journey must keep you really fit…,” he said, admiring Ash’s muscles. “C-can I touch them?” he asked, salivating.
“Huh? Oh, uh…sure, that’s fine with me I guess.”
“R-really I can?” The schoolboy didn’t wait for Ash’s answer before proceeding to grope the older boy’s biceps.
Meanwhile, the office worker grew jealous. He grunted. Hmph! he thought. Kids these days. No respect for their elders. He waded over to Ash, huffing and puffing. Then, with gusto, he shoved the schoolboy out of the way.
“Hey!”
“My turn.”
Before Ash could protest, the older man started to fondle Ash’s chest. Ash’s thick pecs were grasped firmly, squeezed, rocked, with the occasional finger grazing across his sensitive nipples. Ash’s cock pricked up and stiffened involuntarily, causing the schoolboy’s eyes to widen in surprise. Ash let out a soft, unexpected moan. The older man grinned.
“Yer an excitable one, aren’t ya?”
Ash stifled another moan. “Ah…I’m really sore, and that feels good,” he admitted.
“Well, yer in luck. I happen to be a certified masseur.” He wasn’t. “Normally, I charge quite a bit fer a massage, but seeing as yer new here, I’ll give ya one fer free.”
“Really? That’s very nice of you, thanks!”
“Hey! I wanna help!” the schoolboy squeaked.
“Sure, sure, why don’t ya just watch me first, little fella. You might learn a thing or two.”
The schoolboy pouted.
The portly office worker turned Ash over to face the other side, then started to massage the Pokémon trainer’s muscles, starting from his neck and shoulders and down his broad back. The main’s thick hands were strong and surprisingly skilled. Ash, weary as he was from his recent ordeals, nodded off to blissful sleep. The man licked his lips, and his small, chubby cock grew three-fold, resting against Ash’s plump ass.
“Mmm…,” the man moaned. He swapped places with Ash, leaning back on the edge of the onsen while holding the Pokémon trainer in front of him. His wandering hands groped Ash’s pecs and pinched the boy’s perky nipples. Ash’s cock grew stiffer.
Now on full display, Ash’s striking body caught glances from the other patrons. The schoolboy approached from the front and, unable to stop himself, let his small hands pick up Ash’s heavy cock. The schoolboy was entranced: he handled it gingerly at first, wondering what treasures were contained within the throbbing piece. Sensing how it responded to his touch, the schoolboy started to caress Ash’s cock as if cleaning a tall glass.
The office worker grunted in annoyance, but he was too engrossed in the sensation of fondling Ash’s thick pecs and his own cock sliding smoothly between Ash’s cheeks to tell the schoolboy off. The schoolboy’s hand motions became more confident and deliberate, now resembling the act of polishing a mud ball. Although Ash was sleeping soundly, his body yet tensed, and he was on the cusp of orgasm. The older man grinned, his own cock close. The schoolboy kept his gaze on Ash’s pulsating cock, wide-eyed in anticipation.
Suddenly, the two perverted patrons were interrupted by a shuriken made of water bursting on impact and splashing in their faces. Ash startled awake. Catching the schoolboy red-handed, or rather, cock-handed, Ash shouted, “Hey!”
“Eep!” the schoolboy squealed, turning around and wading as fast as he could away, which wasn’t very fast at all with the water weighing him down.
Ash propelled himself forward. The office worker groaned, vexed. Having his flow interrupted, his orgasm was ruined and his cock became soft. Unwilling to deal with the consequences of his actions, he pulled himself up out of the onsen and raced to the exit. The other patrons started to leave as well, some in secondhand shame and some in secondhand arousal. Ash was left in the onsen, nipples and cock still hard, body still sore, alone to deal with it. Or so he thought.
From the corner of his eye, Ash spotted a shadow flashing from one end of the onsen to another, impossibly fast. With repeated flashes, the shadow came closer. Ash braced himself for an attack, clenching his teeth and baring his fists. But there was nothing. Perhaps Ash was alone after all. Just as he was about to relax, Ash spotted a pair of round, black finger pads on his pecs. How did they get there without him noticing? They felt slick and familiar, but Ash didn’t recognize the touch. He turned around but not fast enough, for whatever was behind him disappeared. As Ash let out a breath he didn’t realize he was holding, the black finger pads reappeared on his pecs, grazing his already sensitive nipples. Ash’s body tensed, and he was ready to turn around again and try to catch this mysterious figure, but he found himself stuck. A thick, red, gelatinous rope surrounded him, slithering around his body. It slinked toward his legs and coiled around his cock, grasping it firmly. Ash struggled to break free but found the rope unflappable.
Ash shouted in frustration, “Let me go!”
The black finger pads and red rope withdrew, leaving Ash once again naked and uncomfortably aroused in the onsen, unsure what was assailing him. He decided to get out, but as he took a step forward, he walked headfirst into a black figure.
“Ow…,” Ash groaned, clutching his head. Looking up, his assailant was finally revealed to him.
Standing in front of him, perfectly still, with an aura of elegance and self-assuredness, was a shiny Greninja. Black and gray from head to toe, save for its bright red tongue and the light blue stars on its thighs, the Greninja was magnificent. Upon seeing the Pokémon, Ash’s defenses lowered and he extended a hand.
“I’m Ash. Why are you attacking me, Greninja?”
The Greninja looked at Ash’s outstretched hand and shook its head, while its arms remained crossed.
“You’re…not attacking me?”
Greninja placed its hand on Ash’s chest. Ash could feel his heartbeat. Suddenly, he understood. Whether Greninja were sharing its innermost desires with Ash through some strange aura phenomenon, or Ash was simply that good at picking up on the thoughts and feelings of Pokémon, Ash realized that Greninja wanted…to bond with him. Not as trainer and Pokémon, but as two souls intertwined to one. Greninja could sense how strong Ash was, and it wanted to become even stronger, by acquiring some part of Ash.
Ever the Pokémon fanatic, Ash offered to help Greninja, although his unsatisfied cock floated discontentedly in the steaming hot water. Greninja noticed this and assured Ash that his cock would be well-taken care of.
Reappearing behind Ash, this time with the boy’s knowledge, Greninja placed its hands on Ash’s pecs again, teasing his nipples and exciting his cock. Its long, red tongue maneuvered around Ash’s body, squeezing the boy’s muscles, slithering down to his cock and squeezing that too. Greninja’s tongue encircled Ash’s cock, then slipped inside his urethra, tasting all of the precum that had been slowly accumulating since Ash was first fondled by the perverted office worker and schoolboy. Ash moaned and rocked in place, letting his cock get fucked by Greninja’s tongue. Meanwhile, Greninja’s thick, black shaft unsheathed and pushed inside Ash’s ass. Ash spread his legs, inviting the slippery cock in. Greninja gripped Ash’s pecs for support and thrusted, making Ash moan louder. Ash felt good, and he could tell Greninja was feeling good too. He hoped this was enough of a bonding experience for the ambitious Pokémon.
It wasn’t.
What the shiny Greninja really wanted, which it had kept hidden from Ash, was to be one with the aspiring Pokémon Master, just as Ash had become one with his Greninja. Pleasuring Ash just enough to get his guard down was just part of the plan. As Ash rocked and moaned with Greninja’s cock inside his ass and its tongue inside his cock, Greninja prepared for the next part of its plan. Gathering mucus from its knees, Greninja rubbed the slimy black film across Ash’s muscular body. Ash found the impromptu massage pleasurable and thought nothing of it, focusing instead on his impending climax. It was only after Ash’s whole body became inexplicably coated in the black film—had it been inching across his body on its own, surrounding his fingers and toes and the soles of his feet?—did Ash realize there was something else going on. He tugged at Greninja’s tongue, trying to get it off him, but it was latched onto him tightly. Greninja pulled him closer and, with a modest grunt befitting of the Ninja Pokémon, came inside the boy, filling his ass with more of the milky black substance. As the pressure built inside Ash’s ass, Greninja’s tongue rapidly thrusted in and out of Ash’s cock, and the combined sensations brought Ash over the edge. Greninja’s tongue absorbed all of Ash’s cum, letting not a drop go wasted.
Now free, Greninja’s tongue wriggled its way into Ash’s ear. By some unknown mechanism, Greninja invaded Ash’s mind. It felt like Greninja’s tongue was worming its way through Ash’s ear canal and past his eardrum, up into his brain, slithering over and around it, massaging it, with slime oozing out and seeping into all its crevices.
On the outside, Greninja was forcibly gooping Ash’s body, applying layer after layer of black mucus. Ash’s mind was blank, and he was only aware of the overwhelming sensations afflicting his body, with no ability to protest. Ash could hear a droning in his head. Was it the sound of Greninja’s thoughts? Was it something else? As Ash’s muscles disappeared and reappeared under the black goop, more prominent and lustrous than before, Greninja’s body seemed to melt away. The latex-like material spread to Ash’s head, covering his eyes, filling his nose, mouth, and ears. Ash’s senses were dulled, he could no longer see and could only barely hear. The onsen’s heat was only a memory. Ash felt a squishy sensation enter his anus and plug it, and another in his urethra, then that too faded into nothingness. Ash was one with the dark. He was one with Greninja.
The new and improved shiny Greninja-Ash stepped out of the onsen. The sleek black coating, accentuating Ash’s muscular physique, seemed almost like a gimp suit. It might as well have been one, as the boy underneath it was now shiny Greninja’s unwitting slave.
Chapter Text
Just past the mountains hiding Ninja Village, connecting cozy Couriway Town with the illustrious Anistar City, was Route 18, better known as Vallée Étroite Way for the narrow valley in which a vast network of mine railways from a bygone era still stood, rusted and run-down yet impressive nonetheless. The valley was otherwise lush and green, with overgrown tall grass and a river flowing freely through it, over which a small wooden bridge connected the east and west banks. It was on the eastern bank that the shiny, black Greninja-Ash was resting, admiring the way the pristine water flowed unbothered.
Farther to the east, the mine railways were swallowed up by the many mouths of Terminus Cave. Formerly the site of a fierce battle between Ash and the deranged—though fashionable—Team Flare, and formerly still a bustling coal mine, now it was completely devoid of human life, abandoned save for the rare Pokémon that lurked in its depths. One of these Pokémon, a starving Ariados, had been tracking Greninja-Ash’s movements since it first noticed the curious half-human, half-Pokémon hybrid traversing down the mountain. Ariados was particularly interested in how Greninja-Ash tasted, and during the night, as the ninja was sleeping, Ariados sneakily attached a sliver of silk to its person. Since then, Ariados had followed its silk line all the way down the mountain to the riverbank where Greninja-Ash now sat, unaware.
Greninja-Ash had a lot on its mind. After merging with, or rather usurping, Ash’s body, the human-Pokémon hybrid was busy inserting trickles of desire into Ash’s possessed mind, sending black goopy tendrils to massage all the ridges and grooves of Ash’s brain and rewrite his fantasies. It was a painstakingly slow process, even painful at times, as Ash’s consciousness and individuality slumbered deeper into obscurity. A part of him remained, as it always would, just a bystander with the barest of faculties. Ash’s mind was in the middle of being massaged when Ariados attacked.
In a normal battle, Ariados wouldn’t stand a chance against Greninja, much less the supercharged Greninja-Ash. But with Greninja-Ash distracted, Ariados’ Sticky Web landed squarely on the ninja’s broad back with a powerful impact, the edges of the sticky silk web wrapping around to Greninja-Ash’s chest, immobilizing its arms. Greninja-Ash jumped to its webbed feet, but another perfectly executed Sticky Web bound its legs. The ninja teetered on its toes for a moment before toppling over into the river with a splash. Greninja-Ash seemed to be swimming in place, much like Magikarp failing to climb a waterfall, as it struggled against the current. Ariados approached the riverbank calmly, unperturbed by the prospect of its prey getting away. Instead, Ariados pulled on a near-invisible silk thread, slowly dragging Greninja-Ash toward the edge of the riverbank, out of the water and onto dry land.
As Greninja-Ash’s wet body wriggled about, trying to get out of its silky bondage, the Long Leg Pokémon crawled above it, covering the ninja in its large, ominous shadow. Greninja-Ash hastily conjured a water kunai to cut through its bonds. As Ariados descended to bite the ninja, Greninja-Ash flipped over and used both legs to kick the Long Leg Pokémon square in the abdomen, launching it high into the sky. Recovering its footing, Greninja-Ash brandished a blade shrouded in darkness, preparing to use Night Slash, but Ariados launched a barrage of poisonous threads as it landed using its signature move, Toxic Thread, which slowed the ninja down and caused it to succumb to poison. Greninja-Ash staggered and attempted to prepare a counterattack, but the nimble Ariados had already closed the distance and launched a follow-up attack, its treacherous Venom Drench move. Greninja-Ash was soaked in an odd, poisonous liquid which compounded with the effects of Toxic Thread, incapacitating the ninja.
When Greninja-Ash came to, it found itself hanging upside down from a tree, bound by sturdy silk threads digging tightly into its shiny black latex skin. The silvery white threads seemed to glow in the moonlight and created wisps of dancing light as Greninja-Ash struggled against them. The more Greninja-Ash squirmed, the tauter the toxic threads became, seeping more and more poison into the pores of the ninja’s skin. Instead of causing pain, the poison seemed to make the ninja more relaxed. In fact, it felt good, like little tingles of pleasure scattering across the ninja’s ensnared body.
From beyond the shadows of the night, Ariados appeared, crawling toward its captive, its fangs contracting excitedly. Its abdomen pointed up, shooting white thread up into the sky where it stuck to a tree branch. Ariados rose into the air slowly until its head was level with Greninja-Ash’s crotch. Snipping open the threads around its captive’s groin, Ariados nudged the exposed black latex until a bulge formed. Already aroused by the aphrodisiac poison, Greninja-Ash groaned uncomfortably as its cock became engorged, materializing through the latex coating. It was still Ash’s cock, long and girthy with a mushroom head, but it was coated in black, slippery latex, giving it a different texture and sensitivity profile. Ariados looked at it curiously and grasped it between its fangs gingerly. Taking Greninja-Ash’s cock in its mouth, it sucked as if to leech its captive’s life force. Greninja-Ash squirmed, but the threads binding it were too strong, and despite Greninja-Ash’s best efforts, Ariados’ persistent sucking combined with the cumulative effects of the aphrodisiac poison brought it to a whimpering orgasm. Ariados sipped the defeated ninja’s thick, white bodily fluids at its leisure.
After finishing its feast, Ariados climbed the silk thread and disappeared into the branches, retiring for the night.
Greninja-Ash had long since stopped struggling, paralyzed by an unnerving sensation which flowed throughout its body. From where Ariados’ fangs had gripped Greninja-Ash’s cock, tingles radiated up toward the ninja’s core before spreading outward to each limb. Its fingertips and toes prickled. Muted purple and yellow bands slowly appeared around Greninja-Ash’s hands and feet, resembling striped gloves and boots. Similarly, wide red bands appeared on Greninja-Ash’s neck, the upper half of its chest, and its lower abdomen. The rest of the ninja’s body, including its muscular biceps and thighs, remained a glossy black. Somehow, Greninja-Ash was acquiring Ariados’ form.
After Ariados’ essence was fully assimilated, Greninja-Ash wriggled around again, this time with enough strength to break through its sturdy silk bonds. The ninja landed nimbly on its feet and squatted, admiring its new look and noticing that it felt different too. It was stronger—strong enough to break through normally unbreakable silk—faster, and its fingertips and toes acquired a mysterious quality. On top of being webbed which boosted its swimming prowess, Greninja-Ash’s fingers and toes now had a retractable stickiness to them. It was said that Ariados’ feet are tipped with tiny hooked claws that let it scuttle across walls and ceilings; Greninja-Ash wondered if it now had similar abilities. More strangely, where Ariados could produce silk from its mouth and its rear, Greninja-Ash found that it could produce sturdy, sticky silk threads from its wrists instead. Shooting these threads judiciously enhanced the ninja’s mobility significantly, allowing it to reach new heights and swing between them, turning even the most perilous environment into a simple obstacle course.
Greninja-Ash was pleased with its newly acquired powers, yet to be so strong without purpose…was a shame. Some deep-set part of shiny Greninja which craved vengeance twisted around with the part of its slave Ash that only wanted to do good, forming a mutual desire for vigilantism. What better place to do so than the grand Lumiose City, where the bright lights and haute couture masked rampant crime? But Lumiose was far, and Greninja-Ash wanted to test its new powers out now. Making a decision, it dove headfirst into the river and swam effortlessly upstream toward Anistar City.
Peeking over the edge of an abandoned mining cart with binoculars, a man wearing an orange suit tracked Greninja-Ash’s movements. He didn’t notice the blinding flash of yellow darting after the ninja.
mew85 (Guest) Thu 19 Jun 2025 02:51AM UTC
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The_Prince_of_Oatmeal Thu 19 Jun 2025 03:04AM UTC
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mew85 (Guest) on Chapter 2 Fri 12 Dec 2025 06:53AM UTC
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