The Body-Swap Car (Pixiv Fanbox)

"Haah…… Damn it, this is a pain……"

　A heavily muscled giant sat hunched over, glaring at the bullet train reservation website displayed on his computer monitor. After going through the fare table, he meticulously examined even the fine print, searching for any mention of discounts. Having finished his thorough inspection, he leaned back in his chair and let out a sigh.

　His name was Kengo Dojima. At thirty-eight, he was in the prime of his career, with sales figures that ranked among the best in the company. His juniors also looked up to him and relied on him for guidance. In short, he was what you would call a top-notch salesman.

　He had devoted himself to baseball during his school years, and even now, as a working adult, he never skipped his gym workouts, determined to maintain his physique. His tall frame was evenly covered in muscle built up over many years of training, and even through his business suit, it was clear that his imposing build was more than just a matter of height.

　The broadness of his shoulders flowed into a thick, muscular chest. His upper arms seemed to stretch the sleeves of his suit from within, while his silhouette tapered down toward his waist. Even without flashy accessories or elaborate adornments, the well-trained body of a man like him had a way of drawing the eyes of those around him.

　The reason for the deep furrow between his brows was the recent economic downturn.

　A business trip had come up at short notice. In the past, he could have chosen a seat on the bullet train without a second thought, but the company's latest cost-cutting measures had ruled out one option after another. Even the cheaper plans he had finally managed to find were all fully booked. He kept changing his search criteria and trying again, hoping to find a slightly less expensive train, while the hands of the clock moved mercilessly forward.

　As he thought about all the time he was wasting, the idea of giving up and paying the difference out of his own pocket crossed his mind. But as the breadwinner of his family, and someone who occasionally treated his junior colleagues to meals, he wanted to cut expenses by even a single yen. Besides, his son was only ten, and there was no end to the expenses that came with raising a child. Family events wouldn't wait for him, either.

　As he sat there with his eyes closed, trying to rest them after hours of staring at the screen, someone gave Kengo a light tap on the shoulder. It was his General Manager, Yoshiharu Ogaki.

"Dojima, you still haven't found anything?"

"No. I can't seem to find a train that meets the requirements……"

"Then let me show you a good website."

　Ogaki worked the keyboard and opened a bullet train reservation site. The website displayed on the screen was one Kengo had never seen before. His eyes narrowed as he read the words prominently displayed in the center of the homepage.

【We only offer unreserved seats in our men-only train car】

"Huh…… Men-only?"

"That's right. It's unusual, but the fares are cheap, aren't they?"

　They certainly were cheap. Far too cheap. The fares were lower than those on any reservation site Kengo had spent hours painstakingly searching through, tempting him to book a ticket on the spot. And yet, the very fact that the prices were so low made the whole thing feel unsettling.

　The website's explanations were strangely sparse, yet it listed a number of warnings that Kengo had never encountered on an ordinary bullet train reservation site. Among them, one particularly bizarre statement caught his eye.

——Please be sure to listen carefully to the onboard announcements after boarding.

——Tickets are non-refundable.

　And finally——,

——You must agree to the terms concerning your 【BODY】 before boarding.

"Body……?"

　Kengo muttered the word without thinking.

"Is this really okay, sir?"

"Gahahaha! These days, there are people who file complaints just because a train arrives one minute late. This is probably just a scare tactic to keep them in line. Don't worry about it!"

　With a hearty laugh, Ogaki brought his thick palm down on Kengo's shoulder. Kengo's well-trained body shifted slightly under the impact. His misgivings had not gone away, but his business trip had already been scheduled. In the end, Kengo completed the reservation process, still unable to shake the uneasy feeling that something was not quite right.

＊＊＊

"Haah…… haah……!"

　On the day of his business trip, Kengo was sprinting along the station platform. Of all days, he had overslept that morning. He checked his wristwatch and saw that only five minutes remained before departure. With a large bag slung over his shoulder, he raced up the stairs and somehow managed to slip into the designated train car just in time.

"Phew……"

　As soon as he sank into his seat, Kengo let out a long breath. Sweat trickled down his forehead, while several thin trails ran along the back of his neck. A faint sheen of perspiration had spread across his back, and the front of his dress shirt rose and fell noticeably with each breath. He took out an antiperspirant body wipe and wiped his face and neck. Then he swept back his damp hair, but his forehead still radiated heat from the exertion.

　The train car was almost full.

　However, something about it seemed different from an ordinary bullet train. There appeared to be fewer seats, with unusually wide gaps between them. As a result, the other passengers caught his eye even when he had no intention of looking at them. Toward the front sat an elderly man gazing out the window with a serene expression. A little farther ahead, two young men who looked like university baseball players sat together.

"Where should we go first once we get to the hotel?"

"Forget sightseeing! Let's grab something to eat first!"

　The two young men chatted excitedly about their plans for the trip. Both had physiques that were impossible to overlook.

　One had closely cropped hair and sun-tanned skin. His T-shirt stretched across his broad shoulders, beneath which lay a thick, muscular chest. Even as he sat casually, the contours of his well-developed muscles stood out along the arms visible beneath his sleeves.

　The other was tall and had a shaved head, with a thick, powerful line running from his neck into his shoulders. The fabric of his T-shirt clung naturally to his chest, giving him a certain sensual appeal even in the eyes of another man.

　Both had the unmistakable builds of baseball players. As Kengo watched them, he suddenly found himself remembering his own school days, and a faint smile crept across his lips.

　In front of them sat a boy who looked to be in elementary school and a man who appeared to be his father. The boy seemed thrilled to be riding a bullet train for the first time, chatting excitedly as he pointed out the window at the passing scenery.

　It was an entirely ordinary scene. Or so Kengo thought. Just then, a man came rushing into the seat beside him in a flurry of hurried movement.

"J-Just made it……!"

　The door at the rear of the train car slid open, and a middle-aged office worker came tumbling inside. Apparently, just like Kengo, he had boarded at the very last minute.

"Hah…… hahh……!"

　The man had a round face, and his middle-aged paunch pushed out against the front of his dress shirt. Sweat poured from his forehead, and his armpits were so soaked that the fabric had darkened. He glanced around the train car and spotted the empty seat beside Kengo.

"Excuse me, I'll take the seat next to you!"

　The moment he dropped heavily into the seat, the stale, sour smell of sweat wafted over to Kengo. He furrowed his brow for just an instant, but it was too late to change seats now, and there probably weren't any others available anyway. With a quiet sigh, Kengo told himself he would just have to put up with it for a while, then lowered his gaze to his smartphone.

＊

　Before long, an announcement came over the train's speakers.

【Thank you for traveling with us today. This train will be departing shortly.】

　The doors closed, and the train car shook slightly. The Shinkansen slowly pulled away from the platform, quickly picking up speed. The scenery flowing past the windows disappeared, and the train car grew dark. They had entered a tunnel. At that moment, a voice with a different tone from the one heard moments earlier came over the speakers.

【This train car is a men-only train car——the Body-Swap Car.】

"……Huh?"

　The sound escaped Kengo's lips before he could stop it. Up ahead, passengers began calling out one after another, and their voices set off a wave of commotion that spread throughout the train car. The two university students who seemed to be traveling together exchanged glances, while the elderly man looked around, wondering what was going on.

【In this train car, we provide our passengers with a service that differs from those offered in ordinary train cars.】

"What do you mean, ‘service'?"

　One of the university students raised his voice. The cheerful tone he had had while enjoying his trip just moments ago was gone.

【This train car allows you to experience a different life by exchanging bodies with other passengers.】

"……!"

　Several gasps rang out throughout the train car. No one could tell whether it was a joke or some kind of malicious prank. The voice coming through the speakers, however, was strangely calm, and its matter-of-fact delivery only made it more unsettling.

"Cut the crap!"

　Someone shouted angrily. Kengo, as if agreeing with the outburst, tried to rise from his seat. But that was when he noticed something was wrong. His body wouldn't move——.

(……What the hell?)

　He tried to put strength into his legs, but his knees wouldn't budge. He attempted to move his arms, yet not even his fingertips responded. It was as though his own body had become something entirely separate from his will.

"P-pweeeh!"

　The middle-aged office worker sitting beside him twisted his already unattractive face into an even uglier grimace as he desperately tried to writhe free. Up ahead, the university students also seemed to be trying to get out of their seats, but both of them had been immobilized in exactly the same way.

　Their broad, powerful-looking shoulders, thick chests, and muscular arms—all of which had seemed so impressive moments ago—were useless in this bizarre situation. The realization sent a chill crawling down Kengo's spine.

　It was like something out of a horror movie or a nightmare. His mind was perfectly clear, yet his body refused to obey him. No, it was far too real to be called a nightmare. He could feel the seat against his skin, the unpleasant sensation of cold sweat trickling down his back, and the strangely vivid pounding of his heart.

　Just then, another announcement came over the speakers.

【Furthermore, upon using this service, each of your bodies is registered as an unreserved seat.】

　Kengo tried to scream. But no sound came out. His body wouldn't move, either. Only his consciousness remained, gradually being pulled away from his flesh.

【Now then, everyone——please enjoy your journey to a new life.】

　The voice, far too calm for the situation, echoed through the darkness. The next instant, Kengo's consciousness sank into complete darkness.

＊

　When he regained consciousness, the first thing Kengo noticed was that he had no sense of up or down.

　Even when he opened his eyes, there was nothing to see. He couldn't tell front from back, or up from down. There was only an endless expanse of pitch-black space.

　The moment he tried to move and reached out a hand, Kengo noticed that it looked strangely translucent. In the darkness, he shouldn't have been able to see his own body at all. And yet, as if his entire body were glowing, he could make out the faint silhouettes of his arms and fingers.

"……What the hell is going on……?"

　As he strained his eyes and looked around, other figures gradually began to appear here and there. The elderly man, the university students, the middle-aged office worker, and the other passengers. All of them were floating unsteadily in midair, their bodies semi-transparent like ghosts.

　Needless to say, not a single person had any idea what was happening. Even their faces, barely visible in the darkness, were tinged with confusion and fear.

"Where…… are we?"

"I was on the bullet train just a moment ago……"

"What the hell is going on!?"

　The passengers' voices overlapped in the darkness. As if to drown out the commotion, a faint light began to shine from below. Kengo instinctively turned toward it, and what appeared before his eyes was an impossible sight——the very train car they had been riding in moments earlier.

　Although it was about ten meters away, the transparent ceiling allowed him to see the inside of the train car clearly. The seats, the passengers sitting in them——everything was exactly as it had been before. Kengo caught his breath. His own body was there, too, of course.

　His large frame sat deep in the seat, head tilted slightly downward, utterly motionless. The sweat still clinging to his forehead, his slightly disheveled hair, his shirt unbuttoned down to his chest——all of it was just as before. His own massive body, which had looked so powerful only moments ago, now lay still like a lifeless mannequin. To Kengo, the sight was deeply unsettling, as though he were looking down from above at his own empty shell lying in a coffin.

"M-my body……!"

　Someone screamed. Prompted by that voice, the other passengers began checking their own bodies one after another. Kengo instinctively started to reach out toward his own body. Just then, another announcement rang out.

【Currently, only the souls of all passengers have been removed from their bodies.】

　Kengo's shoulders jerked in a startled flinch. He couldn't tell where the voice was coming from. There were no speakers around him, and yet the voice rang out with startling clarity, as though it were being poured directly into the inside of his skull.

【By entering a body again, all passengers in their soul form will be able to regain consciousness.】

"S-souls……?"

　The passengers murmured in stunned disbelief.

【Please note that you may enter not only your own body, but also the body of another person.】

　The words sent a stir through the crowd.

【Each body can accommodate only one soul. Furthermore, all bodies are available as unreserved seats, so please choose whichever 《seat》 you prefer.】

"……Enter someone else's body?"

　Kengo couldn't make sense of the announcement at all.

　No, he understood what it was saying. It was just that his mind refused to accept the premise that such a thing could actually happen in reality.

　Perhaps he was dreaming. That seemed like a more reasonable explanation. And yet, whenever he looked down, his own physical body was undeniably there. And he himself, reduced to nothing but a soul, was floating apart from it.

　At first, no one moved. No one could be expected to make a rational decision in a situation like this. What if something happened the moment they tried to approach the train car? Even the thought of that possibility crossed their minds, leaving them hesitant to take any action at all.

　But someone finally broke the silence. It was the elderly man floating right beside Kengo. Without a word, the old man slowly began descending toward the train car. Kengo's eyes widened.

　The old man's soul glided through the darkness with ease, like a fish swimming through water. At first, he moved slowly, but as he drew closer to the train car, his speed increased dramatically. Though the old man himself was by no means physically fit or muscular, his soul descended with astonishing momentum.

"Hey, wait, you old geezer!!"

　A voice tinged with panic came from somewhere. But the old man didn't stop. At last, he passed straight through the ceiling of the train car and reached the spot directly above the seats. Naturally, Kengo assumed the old man would return to his own body. But the soul headed somewhere else entirely.

"……Huh?"

　It was the body of the shaved-headed college student. The old man's semi-transparent soul was sucked into a mass of young, well-developed muscle. The next instant, the massive body gave a sudden, violent jolt.

＊

"He…… went inside?"

　Whispers arose from the surrounding passengers.

　As if prompted by the sound of someone audibly swallowing, the college student slowly raised his head. His body was the same as before. His broad shoulders, thick chest, and powerful arms had not changed in the slightest. And yet, only the 【person inside】 controlling that body was different. The old man's soul had acquired a young man's body.

　The moment the surrounding passengers understood what that meant, the look in their eyes changed.

"Then…… me too!"

　Someone shouted and began descending toward the train car. That was the trigger, and the souls of the men began moving one after another.

　Some headed straight for their own bodies without hesitation, while others made their way toward the bodies of different passengers. Each time a soul touched a body standing motionless, as though drained of all vitality, its semi-transparent form was sucked inside and vanished. Then, the body fused with the soul began to move ever so slightly. Like a puppet that had lost its puppeteer, only to begin moving again——.

　As Kengo watched the passengers fight over one another's bodies, fear rapidly swelled within him. Someone might steal his body. The thought filled him with an overwhelming sense of dread, and that anxiety began to take control of his mind.

　His body was right there.

　He had always watched what he ate, gone to the gym, and devoted himself to training every day. No matter how exhausted work left him, he had never given up his nightly muscle workouts before bed. Year after year, he had built up and honed his physique through sheer effort. His body, the culmination of all that hard work, was right there. He couldn't let someone steal it from him now.

(My body belongs to ME!!)

　He couldn't afford to worry about appearances or hold anything back. Ethics and morality didn't matter anymore. Whatever happened, this was an act of legitimate self-defense. Surely, he was entitled to push others aside—even knock them down—to protect his own body. Kengo plunged straight down toward the train car.

　When the other passengers who had been hesitating finally began to move all at once, the stream of souls heading toward the train car swelled into a massive surge. Kengo struggled to swim through the churning tide. Dodging the other souls as they nearly collided with him, he somehow managed to get closer to 【himself】. His own body was right before his eyes.

　No one had touched it yet.

(Good……!)

　Kengo picked up speed.

　He absolutely could not let someone else use his body. Needless to say, that body was none other than himself, the person he had been for thirty-eight years. The muscles he had built through years of training, the life he had shared with his family, the career he had built through hard work——all of it was etched into that body.

　Just a little farther——.

　Kengo reached out. His fingertips were about to touch his own body.

(I can get back……!)

　It happened in that very instant. Another soul came hurtling in from the side at tremendous speed.

"——What?!"

　A violent shove to the shoulder sent Kengo's soul flying backward.

"Wait!"

　His outstretched hand grasped at empty air. He had been beaten by a fraction of a second. The other soul, which had been heading straight for Kengo's body, slipped inside it. The semi-transparent soul vanished, and 【Kengo Dojima】's body gave a slight shudder.

"My…… body……!"

　He reached out with a desperate cry, but the 【seat】 was already occupied, and nothing happened.

　To make matters worse, the force of the shove had sent Kengo's soul hurtling off in another direction. Waiting there was a body that no one had entered yet, one that exuded an unpleasant, sharp smell of sweat from every inch of its surface. It was the fat body of the middle-aged office worker who had been sitting beside Kengo just moments earlier.

"N-nooooooo!!!"

　Kengo desperately tried to change direction. But his momentum showed no sign of slowing, and his soul ended up touching the body. The next instant, his vision exploded into white.

　And then——everything was shut out.

＊

"Give it back! Please, just give me my body back!!"

　Kengo woke to a scream that sounded almost like a cry of desperation.

　The moment his vision returned, he caught sight of the scene before him and gasped. The train car he had been riding in just moments earlier was engulfed in chaos straight out of a nightmare. Shouts and angry voices rang out from all directions as some passengers struggled desperately to reclaim their original bodies while others fought to keep them.

　And directly ahead of Kengo stood the old man who had been among the first to return to a body. No——to be precise, it was the old man's body, which should now have been occupied by the soul of the university student with the shaved head.

　Wearing the old man's appearance, he gripped the shoulders of a young man far larger than himself with both hands, desperately pleading, "Give me back my body!" His opponent, however, showed no sign of caring. On the contrary, he slowly ran his thick palms down from his chest to his abdomen, gazing at the muscles beneath his hands with an expression of rapt fascination, as though savoring the feel of each powerful contour.

"Good heavens…… what a magnificent body. It's nothing like the one I had in my younger days."

　Kengo shuddered at the sight of such an unmistakably elderly manner of speaking coming from that young man's body. Beneath the broad chest of the sturdy young man, his thick pectoral muscles rose and fell slowly with each breath. Below the hem of his shirt, the contours of his abdomen showed the hard definition built through years of baseball.

　He gazed at his own body as though admiring a rare gemstone. There was something deeply unsettling about the sight, making it impossible to ignore the fact that the body and the soul inhabiting it had become completely mismatched.

"Wow! So this is Dad's body……! I feel like I've become a superhero!!"

"H-hey, Minoru! Calm down!!"

　Nearby, another man was striking poses to show off his muscles. Apparently, his son's soul had entered his father's body. He was visibly excited, puffing out his chest and flexing his biceps. Beside him, a boy who looked to be of elementary school age wore a bewildered expression as he called out to the son who had taken over his body, desperately trying to calm him down.

(What the hell is going on……?)

　Angry shouts, stifled sobs, and ecstatic gasps filled the train car. No one could tell whose soul was inside whose body anymore——not even the people directly involved. The entire train car had become one enormous nightmare.

　Amid the chaos, Kengo cautiously turned to look beside him——and froze. The person standing there was 【himself】.

　No——to be precise, it was someone who had taken over his body.

　The body of 【Kengo Dojima】 was breathing heavily as its new occupant gazed up and down at his own muscular physique, drinking in every detail. His broad, thick chest. His firm, defined abdomen. Someone else was examining the body Kengo had built through years of training, wearing an expression of pure fascination.

"Stop……"

　Someone other than himself was moving his body. That alone was unbearable, but the person occupying it was handling his physique without the slightest restraint, fondling his chest and enjoying the feel of his muscles.

"STOP IT!!"

　Kengo screamed. But the voice that came out was not 【his own】. It was deep and muffled, an unpleasant voice that sounded as though something were lodged in the back of his throat.

　He cautiously looked down at his body. In the lower part of his field of vision, he could see a belly so swollen that the buttons of his dress shirt looked ready to burst off at any moment. It was the exact opposite of Kengo's own six-pack abdomen: a sagging mass of loose fat. Below it were slacks damp with sweat, stretched tight around his thighs.

"Ugh…… ah……"

　Something sour rose from his stomach, and Kengo instinctively clapped a hand over his mouth. Even from that palm, the same stale sweat odor he had noticed from the man sitting beside him earlier assaulted his nostrils. This was supposed to be his body, yet it didn't belong to him. This smell, this fat, these short fingers——every bit of it belonged to 【that man】.

　And yet, he was the one experiencing every inch of that body. The sensations and the body itself were fundamentally at odds, creating an alien sense of wrongness that seemed impossible in this world. The fact that this abnormal sensation was gradually beginning to feel familiar was itself slowly eating away at Kengo's mind.

　If things continued like this, his mind would completely merge with this body, and he would lose himself. Convinced of that, Kengo lunged at the man who wore the appearance of 【Kengo Dojima】.

"You bastard!! Get out of my body!!"

　At that moment, 【Kengo Dojima】 finally raised his head. His expression twisted for an instant, as though he were looking down on Kengo with contempt, but then it transformed into a somewhat amused smile.

"Ahaha, sorry about that…… I never dreamed I'd get my hands on such an amazing body, so I kind of lost myself for a moment. Wow! Even this voice is so deep and cool……♥"

　The man who had stolen Kengo's body seemed captivated not only by its powerful physique but also by the voice coming from his own throat. Just looking at him made Kengo's blood boil. As though mocking Kengo, who trembled with rage, 【Kengo Dojima】 continued speaking.

"You heard that announcement saying we could enter other people's bodies, too, didn't you? If you wanted to get back into your own body so badly, you should've done it right away. Don't you think it's your own fault for standing around like an idiot, Mr. Kengo Dojima? Ah, crap……! It's not just your body——I'm starting to be able to use your brain, too♥ The life of 【Kengo Dojima】, a straight salaryman, is flowing into meeee……♥♥♥"

"D-don't screw with me…… Ngh♥"

　For an instant, the man standing before him looked just like 【Kengo Dojima】 himself. The moment Kengo felt a surge of fear at this impossible sight, the memories of 【someone】 he had never known came flooding into his mind like a flashback.

　Throughout his school years, he had been mocked relentlessly for being fat. Even now, as a working adult, his colleagues, seniors, and juniors at work found one excuse after another to make fun of him. The miserable memories of a life he would rather forget—the life of 【Satoshi Yamada】, the owner of this body—somehow stirred a strange excitement within Kengo.

"Looks like you got to experience my life firsthand, Kengo——no, 【Satoshi Yamada】♥"

"Wha——?! Enough already……!"

　Driven by anger, Kengo tried to grab 【Kengo Dojima】—Satoshi, who had taken over his body—by the collar. But the arm he thrust out was far shorter than he had expected. His fat-laden arm failed to reach as far as he wanted, unlike before, and merely flailed clumsily through the air.

"……Honestly, you're so damn slow. Well…… now that I get a good look at you, I suppose I can't blame you. That's one truly pathetic physique you've got there."

　Witnessing the comical sight, Satoshi twisted his lips into an even more delighted grin. The ruggedly handsome face of 【Kengo Dojima】 wore a sadistic smile that made him look like an entirely different person. Then, in the very next moment, another announcement rang through the train car, its cold, emotionless tone cutting through the chaos.

＊

【This train car will now begin the final stage of the life-transfer process.】

　Another incomprehensible announcement rang out, the kind that made Kengo want to blurt out, "Not this again!" Then pink smoke began pouring from the air-conditioning vents, quickly filling the train car. The expressions of the passengers who inhaled it began to change before their eyes. Even those who had been raging with anger saw their faces soften as their fury gradually ebbed away, their expressions slowly melting into languorous bliss. Sighs resembling gasps escaped from all around the train car, eventually transforming into sweet, breathy cries.

　Oh, this is bad——really bad. Even as his instincts sounded the alarm, his body refused to obey him. If anything, the smoke almost felt like a savior, bringing pleasure in its wake.

　Deep down, Kengo was disgusted by Satoshi's behavior, yet the sight of the man toying with his body remained burned into his mind. 【Kengo Dojima】 was fondling his own flesh, savoring it with a lingering, almost lapping touch. His rugged features had already transformed into an expression of near-total abandon, and an intensely sensual allure—something Kengo had never seen on his own face before—emanated from him. Meanwhile, the body of 【Satoshi Yamada】, forced to witness the spectacle, was gradually growing warm with excitement.

"You're making quite a face there, Kengo♥ Have you already gotten so used to that disgusting body that your soul's started settling right in?"

　Satoshi wore a mocking smile as he casually stripped off his suit jacket, slacks, and underwear, then opened the front of his dress shirt. 【Kengo Dojima】's vigorous, vitality-filled physique was revealed, his exquisitely trained muscles standing out beneath the lights of the train car.

"Wha…… stop……"

　Kengo tried to look away. But now that he was using the brain of a man named 【Satoshi Yamada】, his gaze seemed to have become fixated on the sexy body of 【Kengo Dojima】.

"Come on, just look at this body♥ You spent years working hard to build this physique——and now I'm the one using the fruits of all that effort, even though I was a fat guy just a little while ago……♥ It's always been my dream. To fully experience a manly body like those of my former classmates who bullied me, the kind of guys who look like winners in every way……♥"

　As he spoke, Satoshi began running his hands all over the muscular body of 【Kengo Dojima】. He stroked the hard biceps with the pads of his fingers, traced the grooves between his defined abdominal muscles, and kneaded his bulging pectorals. Each movement was performed slowly and languidly, as though he were savoring and cherishing this newly acquired 【body that wasn't his own】.

"Ahh, amazing…… This level of sexiness should be against the rules……♥ And look, maybe this body I've taken over is enjoying it, too. It's trembling all over with pleasure……♥"

　A rich, low voice, laced with a sugary sweetness and sensual allure, reached Kengo's ears. Within his mind, which had been filled with nothing but discomfort and revulsion, a different emotion was beginning to take root.

(As if I'd let this bastard get away with using my body! I want to punch his lights out right now……!)

　Perhaps it was the effect of the smoke he had inhaled through his nose. No matter how hard he tried to resist, he couldn't bring himself to act. Worse still, he couldn't tear his eyes away from 【Kengo Dojima】's body.

　Suddenly, Satoshi's thick arm wrapped around Kengo's back, pulling him into a forced embrace. With the man's broad, muscular chest pressed against him, Kengo tried to wrench himself free by force. But in reality, he barely put any strength into the attempt. His face was contorted not by the fear or disgust of being pinned down, but by an entirely different kind of excitement.

(The feel of a muscular man's skin……♥ That strong, masculine smell of sweat……♥)

　The hands that had supposedly been trying to push Satoshi away had somehow found their way around his broad back. The warmth of his sweat-damp skin felt pleasant. Each time Satoshi touched him, a wave of pleasure like tiny electric currents coursed through the entire body of 【Satoshi Yamada】, now inhabited by Kengo's soul.

"Ah…… ahh♥♥"

　Before he knew it, even a pathetic little moan had escaped his lips. What a pathetic sound…… Kengo grimaced in embarrassment.

"Does it feel good, Kengo? Every time you feel pleasure in that body, your soul gets more and more accustomed to that fat, ugly physique♥ And when that happens, I'll get to keep everything that belongs to Kengo Dojima, won't I? Your family, your career, even the life of a winner you've lived in this hulking, muscular body——"

　He whispered into Kengo's ear, teasing him. Kengo should have been trembling with humiliation and anger, yet the voice of 【Kengo Dojima】 was so sweet that it stirred his heart, unbearably sensual and impossible to resist. Kengo tried desperately to force out words of rejection, but 【Kengo Dojima】's face, faintly flushed, slowly drew closer until he breathed hotly into Kengo's ear.

"Now that I've acquired all of 【Kengo Dojima】's memories, this body is mine. To celebrate our exchange of bodies, how about having sex, 【Satoshi】?"

＊

　Sex between men. Before boarding the bullet train, it would have been an act that Kengo could only bring himself to reject. But now, it was an irresistible temptation. Inside the train car, judging by the sounds, it seemed that the passengers had finally lost all restraint and were having sex with the very people whose bodies they had switched into. Lewd noises could be heard coming from all directions.

　The loud, rhythmic smacks of powerful male bodies colliding, echoing with every thrust. The wet, squelching sounds of a cock thrust deep into an anus, scraping against the intestinal walls. And the moans of passengers surrendering themselves to pleasure, lost in sex between men. Perhaps it was the effect of those sounds, but Kengo's reason slowly faded away, as though melting into nothing.

(I want to have sex with another man. I want a muscular man to sweat all over me and do whatever he wants with my body. But——)

"Heeheehee……! Never thought I'd get my cock sucked, but damn, this feels incredible♥ Hey, youngster…… no, 【Old Man】! Get your toothless mouth around my manly, musky cock and suck it harder, will ya?"

"Woooow! 【Daddy】's cock has gotten so big, it looks just like a banana……♥ Hey, 【Minoru】……jerk Daddy's cock some more♥"

　The 【Old Man】 was sucking the 【Shaved-Head College Student】's cock. The 【Elementary-School Boy】 was eagerly stroking his 【Father】's cock. And right before Kengo's eyes, 【Kengo Dojima】, the muscular, beefy office worker, gazed down at him with a ruggedly handsome face softened by pleasure. Everyone in this space had been completely corrupted by this abnormal train car, where the only thing that mattered was the 【Body-Swap Car】. Even so, Kengo tried desperately to hold on to the very last thread of his resistance.

"I…… I don't have sex with men……"

　If he gave in to the pleasure and allowed his mind to merge completely with this body, he was sure to lose everything. That was why he had to endure it. If he could just hold out until the train reached the next station, he might be freed from this nightmare. Until then, he had to resist——.

"Well, whatever. I won't force you. If we're going to do it, I'd rather have some lovey-dovey fun with you, seeing as you're the one using 【my】 body. But this body belongs to me now, so I'm going to do whatever I want with it, okay?"

　Satoshi easily pulled away from Kengo's body, which had tensed up with resistance. He tossed aside the dress shirt he had been wearing, then began pinching and rolling his own nipples between his thumbs and index fingers. In an instant, 【Kengo Dojima】's face flushed crimson, and his half-erect cock sprang to full hardness, standing proudly toward the ceiling. Clear pre-cum spilled generously from its tip.

　A thick chest rising and falling with every breath, a six-pack of sharply defined abdominal muscles, bulging biceps stretched taut with prominent veins, and streams of sweat trickling from his armpits. It was the flawless naked body of a perfectly sculpted man. Yet that body was now writhing lewdly, letting out seductive gasps as desire took hold of him. Surely, not a single person could look away from such a sight.

"Hmm……， look at me, 【Satoshi】♥ I'm a straight man with a wife and kid, but just having a homo freak watch me has got my cock rock-hard……♥ ……I'm already close to cumming♥ Cumming from nipple play while 【Satoshi】 watches me♥♥"

　【Kengo Dojima】 let out a loud, deep groan, then leaned his muscular body back against the passenger seats and blasted out a massive load of cum, like water gushing from a broken faucet. The thick, milky fluid shot out with tremendous force, raining mercilessly over Kengo's face and body as the pungent smell of semen began to fill the surrounding area.

　After working overtime day after day, the man had barely had sex with his wife, let alone found time to masturbate. As a result, his balls were brimming with semen as thick and rich as condensed milk. Even after ejaculating, his massive cock continued to twitch and spasm, while clear fluid kept dripping from the tip of his glans.

"Phew……， nipple masturbation and ejaculation from a muscular, straight office worker…… this is the best……♥♥♥"

　The rugged expression on 【Kengo Dojima】's face had melted away completely as he lovingly stroked his cum-covered cock, gazing at it in a daze. Until just moments ago, his body had belonged to a heterosexual man. Now, it had gone so far as to masturbate in front of a homo, deliberately putting on a show, and even ejaculate. After being forced to witness such a spectacle, it was inevitable that Kengo would find himself unable to maintain his reason any longer. He let out a string of incoherent sounds, threw his arms around Satoshi's body, and began devouring him hungrily.

＊

"Mmh, mmhmmm~~~♥♥♥"

　Kengo was eagerly taking Satoshi's——【Kengo Dojima】's massive cock into his mouth. Despite its considerable length and girth, he took it deep into his throat, desperately working his tongue to pleasure it. His expression had completely transformed from what it had been just moments ago, now looking every bit like that of a horny homo. He had even begun rubbing his nose against the man's balls, greedily inhaling his masculine scent. It seemed that 【Satoshi Yamada】's true nature had all but painted over Kengo's mind in a matter of moments.

　And that was only natural. The brain of the man named 【Satoshi Yamada】, whose body now housed Kengo's soul, was packed with memories of watching gay porn and masturbating over and over, from his student days well into adulthood. Sometimes, he had even indulged in fantasies while masturbating, imagining what sort of sexual acts he would perform if he ever took over the bodies of the men who had bullied him.

　Now that Kengo was using the brain and body of a man with such memories, it would have been strange if he hadn't been affected by them.

"God, what an ugly mug you've got, 【Satoshi】……♥ You're sucking my rock-hard cock while flaring your nostrils wide, even savoring my scent, huh……? Well, of course you are. The sweat of a handsome, straight office worker like me must smell like a feast to a homo like you……♥ I get it, I totally get how you feel♥"

　Holding Kengo's head in place with his rugged hand, Satoshi whispered softly. His touch was gentle, and his voice was calm. Even though it was his own voice, and the man before him was someone he should have hated—a man who was controlling his body against his will—Kengo found himself feeling strangely at ease. Now that his mind had become completely accustomed to the body of a hardcore masochistic gay man, all he could feel was pleasure, even as he was penetrated deep in the back of his throat without restraint and struggled so desperately that he could barely breathe.

　Looking down at his crotch, he caught sight of the pitiful little cock of 【Satoshi Yamada】, rock-hard and leaking pre-cum to the point of bursting. Reacting again and again to the mannerisms and gestures of 【Kengo Dojima】, his below-average cock trembled incessantly.

"Hey, 【Satoshi】. Now that you've experienced something as crazy as switching bodies, you have to admit that this pathetic, fat body of yours isn't so bad, right? If we just keep making each other feel good like this, I'm sure a happy future is waiting for us……"

　Reclaiming his original body and escaping from this bizarre train car should have been the only glimmer of hope he had left. And yet, and yet——he finally leaned over his former body and guided that monstrously thick, oversized cock into his own well-used asshole.

　With wet, sticky sounds, the thick cock, as hefty as a wooden pestle, slowly sank deep into Kengo. The pain felt unfamiliar, as though he were experiencing it for the first time——and yet strangely familiar. He tried to stifle his voice, but the corners of his mouth still curled into a smile.

（Ahhh…… I-it's so big……♥ My asshole is being filled by a cock as huge as an extra-thick dildo……♥）

　Overwhelmed by the tingling sensation, Kengo responded with a completely wanton, feminine expression. The man who had taken over his body grinned, his eyebrows drooping as he thrust his hips back and forth like a rutting male dog, relentlessly pounding away without a moment's pause. As his thrusts gradually grew faster, Kengo's upper body rocked along with them, his soft belly jiggling and rippling with every movement.

　Shuddering as the monster cock reached all the way to his prostate, Kengo could no longer even tell whether the pleasure he was experiencing belonged to him or to 【Satoshi Yamada】, the original owner of the body.

"Heh heh…… That drooling, blissed-out face of yours is ridiculously ugly, 【Satoshi】. But to me, right now, that expression of yours looks sexier than anything else in the world……♥ Don't worry. Once this train car reaches the station, I'll finish my job properly. After that, I'll go back to 【Kengo Dojima】's house and fuck your wife. Then I'll make a kid who looks just like you. 【I】'll carry on with the life you've spent so many years building, Kengo, so you don't have to worry about a thing!!"

"N-No…… I can't…… I'm gonna cum……!! Nghhhhaaaahhh~~~♥♥♥"

　Satoshi gripped Kengo by the hips and delivered one final thrust before climaxing with an ecstatic expression. As a large amount of his own former DNA was pumped into his rectum, Kengo let out an especially loud, lewd cry.

　Clearly feeling the semen flowing from the throbbing cock inside him, Kengo fell into the illusion that he had somehow become a woman. From the tip of his faintly twitching cock, a small amount of thick, viscous fluid trickled down, leaving scattered stains on the floor.

　The two embraced each other tightly and exchanged a deep, passionate kiss. From somewhere in the distance, an announcement could be heard.

【Thank you very much for traveling aboard the Life-Switching Car today. The next stop is 〇× Station, 〇× Station——. Please be careful not to leave any belongings behind when disembarking. We hope you enjoy your journey into your new lives.】

　By the time the announcement ended, the train car, which had been in such utter disarray moments before, had fallen completely silent. Everyone had finished straightening their clothes, as though nothing had happened. From all around them came the sounds of people preparing to get off, along with the murmur of their conversations.

"Oh, right. This is my stop……"

　After straightening his clothes, 【Kengo Dojima】 slung his bag over his shoulder and started to pass in front of Kengo. Suddenly, however, the train car lurched, causing him to lean against Kengo. A thick palm brushed against Kengo's thigh, its warmth spreading through him, while the man's breath fell across his face. Aroused, Kengo's crotch swelled beneath his slacks, leaving a damp stain on the fabric.

"Sorry about that…… And thank you for everything♥"

　Wearing a suit that accentuated his heavily muscled physique, 【Kengo Dojima】 flashed a refreshing smile and joined the line of passengers preparing to disembark. His crotch, just like Kengo's, was violently erect, pushing conspicuously against his slacks. However, since the other passengers around him were similarly aroused, not a single person paid it any attention.

　Having experienced a body swap with another person, Kengo had become a full-fledged 【body-swap fetishist】. As he burned the sight of 【Kengo Dojima】's muscular back into his memory, pre-cum began to ooze from the tip of his glans.

＊＊＊

"How was the ride on the Shinkansen, Dojima?"

　The day after I returned from my business trip, I was working at my desk when General Manager Ogaki approached me with a knowing grin. He placed a hand on my shoulder, then slowly slid it down to my thigh, beginning to run his fingertips over it in a lewd manner.

"Oh, it was a fantastic ride! And I have to say, 【this body】 feels pretty amazing to use, too……"

　I grinned and returned the favor by fondling Ogaki's cock through his slacks. Yoshiharu Ogaki, a devoted family man with three daughters. Despite supposedly being heterosexual, his cock began swelling rapidly in my hand. He made absolutely no attempt to resist. After all, Ogaki was the one who had recommended that I board 【that train car】 in the first place. Naturally, that meant he must have ridden 【that train car】 himself——, and had his body taken over by someone else, too.

　Apparently, everyone who experiences a 【body swap】 aboard 【that train car】 develops sexual desires toward members of the same sex. Perhaps the thrill of engaging in such acts in an office filled with ringing phones and the voices of chatting coworkers gives him a sense of forbidden pleasure. General Manager Ogaki, whose face had taken on the unmistakable look of a lecherous old man, continued groping my body relentlessly, breathing heavily through his nose.

　Eventually, we could no longer hold ourselves back. We ducked beneath the desk and exchanged a deep kiss. The very cock I'd thrust into my wife's pussy just last night was now growing harder by the second in response to a passionate kiss with my boss. This body was now completely under 【my】 control♥

　Should I just go with the flow and have sex with Ogaki in a bathroom stall? Just as I was entertaining the thought, I heard the troubled voice of a junior colleague from a desk a short distance away. Apparently, he was looking at a Shinkansen reservation website.

　Ogaki and I exchanged knowing smiles before heading over to our junior colleague's desk to recruit another 【fellow】 enthusiast.

(End)