The day I plastered my face on my teacher’s body (Pixiv Fanbox)

　Outside in the steamy, hot midsummer sun burns the skin. The buzzing of cicadas and the harmonious sound of the brass band club's performance carry on the wind to the school grounds.

　In the swimming pool next to the grounds of the prefectural R High School, the swim club was hard at work with the sharp sound of a whistle. The sound of their breathing mingled with the sound of waves created by their watery limbs, creating a lively atmosphere befitting a summer afternoon.

　Among them, Fumiya Yoshikawa was swimming alone, silently. Stretching out his arms, he desperately tried to stroke the water. He was too impatient to make as much progress as he wanted to. Taller and more muscular swimmers made one turn after another, lightly leaving Fumiya behind.

──My swim time failed to improve again.

　Fumiya chuckles as he walks up to the poolside and runs his hands through his wet hair. For three years, he had practiced diligently. However, his record has remained stagnant.

　He had already failed to qualify for this year's prefectural competition, and his time was not even close to the All-Japan High School Championships standard record. Still, even though he has retired, he continues to go to the pool, feeling inferior to his fellow swimmers.

　Fumiya also understood. Swimming is a sport that depends on physical strength as well as skill. He knew that he could never be the best if he lacked both.

　He was 162 centimeters, 50 kilograms, fair-skinned, with a childish face. His body was too weak to swim powerfully. He was frustrated, but he didn't show anyone that.

"Good job, Fumiya! Not bad at all today!"

"Thanks."

　The person who approached him was a classmate who had been selected to participate in this summer's All-Japan High School Championships. He had broad shoulders, a thick chest, and tall, slender arms and legs. He is unsparingly showing off his blessed body, which Fumiya could not have obtained no matter how hard he tried.

(Don't say things you don't mean……)

　Inwardly, Fumiya smiled despite the flames of jealousy burning in his heart. He smiled and handed a sports drink to a junior who beat his time, saying, 'That's great,' while offering a towel to an ace of the same age and saying, 'Good job.' It was as if he was a manager, playing the role of supporting them who were better than he was.

(If I had a body as big as these guys, I'm sure I would have…… I wish I had been born with a stronger, more robust body)

　The voice in Fumiya's grieving heart naturally did not reach the ears of anyone present.

＊＊＊

　After changing and leaving the pool, Fumiya was walking down the passageway behind the school building. His water-soaked hair stuck to his forehead as if to mock him, and the bag he carried on his shoulder was heavier than usual. Just as he was about to burst into tears, a familiar low-pitched voice came through the open window of the gymnasium.

"Sit back, and be more aware of your center of gravity!"

(This voice was──)

　Fumiya stopped in his tracks and peeked in through the window.

　Through the window, Fumiya could see the intense movements of men drenched in sweat. Among them was Tomoaki Inagaki, who was tackling a student and instructing him with his sturdy physique. He is the homeroom teacher of Fumiya's class and the coach of the wrestling club. He is 181 cm tall and weighs 85 kg. He is a true athletic teacher, having competed in national wrestling tournaments as a wrestler in high school and college. He sometimes complains to his students that his body has gained some fat due to aging and his diet, but he is still in more than adequate shape and is so strong that he could easily be mistaken for an active athlete.

　On the wrestling mat, Inagaki was fighting and coaching several members of the club one after the other. Dripping with sweat, his steel-like muscles were moving with a wonderful appearance. Fumiya's eyes were drawn to his attractive body.

　His body is a lean, muscular body, his movements are solid, and his techniques are careful and not rough, even when he controls his opponent's stance. All of this was dazzling to Fumiya.

　Before he knew it, Fumiya had his smartphone in his hand. He activated the camera and captured Inagaki's image on the screen through the window. Being careful not to make a shutter sound, he saves many, many pictures of Inagaki’s muscular, raised arms and back, his body through the singlet, which is sticking to his skin with sweat.

──I wonder what it would feel like to be like him.

　Strong, dependable, and imposing── Inagaki was the very epitome of the 【ideal man】 that Fumiya longed to be.

＊

　That night, Fumiya kept tossing and turning in his bed. Even when he closed his eyes, sleep did not come easily. In his mind, the image of Inagaki he had seen in the evening replayed over and over again. His skin drenched with sweat, his muscular backside at the moment he threw his opponent to the ground, and──

(……That armpit)

　Inagaki's armpit, exposed when he wiped his sweat with a towel. Even the thick, black hairs were full of hair, and even they looked sexy. The man's body odor mixed with the smell of aging came back to his mind, and Fumiya unconsciously swallowed his spit.

　He picked up his smartphone and opened the photo folder. There, he saved several images of Inagaki during practice that he had stolen. All of them were covered in sweat, and the smell of a male could be felt even from the pictures. Subconsciously, his finger scrolls and stops at one photo on the screen.

　Inagaki in the middle of wiping sweat off his body. His armpits are wide open, and his face is serious.

　After admiring the folder for a moment, he closes it, and suddenly an advertisement pops up at the top of the screen.

【An app to help you become your ideal self】── Fumiya's eyebrows furrowed at this dubious statement, but for some reason his finger moved on its own. Tapping on the ad, he was taken to a screen where he could download the application. The provider was unknown. There are few reviews.

　It was probably just a joke app. Even so, Fumiya presses the install button. Once the installation was complete, the camera function started up on its own.

'Please prepare a picture of your face and a picture of your ideal person's whole body.'

　Fumiya takes one photo of his own face and then selects a photo of Inagaki's whole body. With a single tap, an image of his own face pasted onto Inagaki's body was displayed.

"……Imbalance."

　Inagaki's muscular body and Fumiya's childish face in comparison. It looked somewhat dumb and laughable, but the composite image was so realistic that it even felt as if the body actually belonged to him. Fumiya's heart was pounding in his chest. His core was burning and he was thirsty.

(……If only I could really be like this)

　With such unrealistic fantasies in his mind, Fumiya put down his smartphone and closed his eyes. In his dream, he envisioned himself using his 【ideal body】 and moving in a dynamic way──.

＊

　The next morning, Fumiya woke up his body on the bed as his alarm went off.

(Huh……?)

　His gaze is higher than usual. And somehow, his body felt strange. At the moment when he hurriedly stood up, Fumiya felt lightly dizzy because the distance to his feet had become far away. He is getting taller.

　Looking down at his arms, unfamiliar muscular muscles. His chest is thick and cleaved, and his abdominal muscles, though thinly covered with fat, are well defined. His legs are also thick and sturdy, and the overall 'density' of his body is blatantly different from Fumiya's body until last night.

　Standing in front of the mirror, his face was still young, but the outline of his head was angular, and his hair was the same as Inagaki's── a short-cropped fauxhawk. His ears had also changed shape, becoming the cauliflower ears characteristic of someone with wrestling experience.

　Fumiya swallowed his spit hard and slowly moved his body in front of the mirror. Bending one arm, his muscles bulged out and a large power hump appeared. When he stretched his chest, his thick pectoral muscles jutted out and the line of his abdominal muscles became more pronounced. When he arched his back and twisted his hips, his latissimus dorsi and oblique abdominis muscles rippled. With each step, the muscles in his thighs rose and his calves stiffened.

　His entire body is muscular and strong. He feels heavier and stronger with every movement. Fumiya was often at a loss for words as he gazed at his reflection in the mirror.

(……Is this my body……?)

　The T-shirts and underwear he was wearing had also changed to a size that fit his body better. Even the uniforms in his closet have all been altered to fit his current physical size.

"……Is this not a dream?"

　Even his voice, as he muttered that, had changed to something low and thick because of the change in his body shape. The baritone voice shakes Fumiya's eardrums and fascinates him.

　Without a sense of reality, however, a thrill of excitement spreads deep in his chest. Fumiya's entire body was filled with the realization that he had almost completely acquired the body of Inagaki, the man he had longed for. Fumiya's lower abdomen heated up, and his massive, weighty penis rose up inside his underwear. At once, the tip of his gray boxer shorts, which pitched a huge tent, turned black with pre-cum.

　Fumiya gently slid down his own underwear. It appeared with a sudden and vigorous movement, and turned toward the sky with an overwhelming presence. The actuality that it's so different in thickness and length from his usual cock makes his throat throb unintentionally.

"This is…… Inagaki-sensei's cock…… It's amazing……, nnghhh♥♥"

　He just put his right hand on it. With just that, pleasure ran through his entire body, and he couldn't help but squeal. Just the stimulation from the finger touch and the wild gasp that came from his own mouth made him feel ejaculation all at once. 'I want to cum just like that.' Fumiya thought so, but he somehow managed to regain his rationality at the last moment.

　Masturbating on someone else's body without permission is indeed a bad idea. And if he didn't get ready soon, he would be late for school. Fumiya hurriedly changed into his school uniform and ran out of the room.

＊

　Fumiya arrived at the classroom just in time to be late, just as the pre-bell rang. Partly because he was confused by the changes in his body and took his time, but also because his stomach was not satisfied with the usual amount of breakfast and he had to have a second helping.

　Just before opening the classroom door, Fumiya's palpitations quickened. He was anxious to see how his classmates would react when they saw him in a completely different appearance than he had been yesterday.

　However, as Fumiya entered the classroom with trepidation, his classmates approached him with their usual expressions. None of them noticed the change in him. Even though his appearance has changed, to the eyes of those around him, he seems to be the same 【Fumiya Yoshikawa】 as before.

(Awesome……, no one has noticed)

　Fumiya took his seat, feeling immorally excited. Because of his larger body, he is somewhat cramped. Even that fact makes his heart flutter. Somehow he managed to keep his crotch from pitching a tent, when the chime rang, the classroom door opened, and Inagaki, the homeroom teacher, appeared.

　The dignified and fearless face of 【Tomoaki Inagaki】 is pasted on the body of the petite and fair-skinned 【Fumiya Yoshikawa】. Inagaki's appearance, which is like a collage, still seems to be nothing strange to the students, who are exchanging words with him.

(They are all interacting with him in a normal way. Even though my body and sensei's body have been swapped……)

　While being enveloped in an indescribable sense of elation, Fumiya felt another thrill of pleasure swirling in the back of his chest.

＊

　Physical education time. Fumiya had chosen Judo. He put his arms through the sleeves of his judo uniform and fastened the obi. The judo uniform, which used to look so awkward, now fits his body perfectly. Combined with his toned body, he could almost look like a professional judoka.

"Okay, then, let's try to get into a fight!"

　The P.E. teacher calls out, and the students face each other in pairs. Fumiya's opponent was a boy from the same class. Previously, he had been lightly thrown across the floor because of his size, but now─

"Hajime!"

　At the same time as the order was given, the opponent attacked. However, Fumiya's body moved naturally. He dropped his back, caught his opponent's movement, and conversely pushed back with all his strength. The opponent was surprised to see his body posture, and at that moment, Fumiya's arm grabbed his collar. With a lean movement, he levitates his opponent's body and slams him down on the tatami in a flash. Dang! A dull thud echoed through the dojo.

　The boy who had been thrown gets up with a stunned look on his face.

"……Wow, that's great, Yoshikawa."

"It just happened to work. Hey, let's do it again."

　Although he said so, inwardly Fumiya himself was also surprised. He had never won a single judo class in his life, and yet he had been able to perform the technique without any difficulty.

(I'm getting stronger!)

　After that, Fumiya continued to win one practical match after another. He was never once knocked down.

　Judo classes used to be a frustrating experience for him, as he was thrown off many times. But now it is different. The moment he gets together with his opponent, 【this body】 remembers how to return it. The experiences and techniques that Inagaki's body has carved out have become his own flesh and blood. Fumiya felt a thrill of pleasure at the fact that the results of Inagaki's years of training were now being demonstrated as his own power.

(This is the body of Inagaki-sensei……)

　By the time the whistle blew to signal the end of class, his whole body was covered in sweat. From inside his soaking wet judo uniform, a muffled smell rose up that pierced his nostrils. The body odor of 【Tomoaki Inagaki】 was emanating from his own body. The smell of aging peculiar to middle-aged men. Every time he deeply inhaled that scent, Fumiya was enraptured.

＊

　After school, Fumiya went to the swimming club room.

　The air was still hot and humid, and the pool was filled with the sound of water and shouts of the other club members practicing hard. It should have been a usual scene, but it looked different today.

　The hardness of his bare feet on the concrete, the sensation of his swimming trunks encircling his buttocks, the presence of muscles from his shoulders to his arms. Everything about him was different from the Fumiya of the past.

"Yoshikawa, let's warm up first."

　The coach's voice rang out. Fumiya lightly bent over and jumped into the pool. 'With this body, I'm sure I'll get a great time──!'

　But as soon as he started swimming, he felt strange. His body did not move as he wanted in the water. His arms and legs were supposed to be flexible and strong, but his timing and balance were not right, and he could not make the progress he wanted. Fumiya checked his time and gasped. He was slower than yesterday.

"Hey, what's the matter, Yoshikawa? Are you tired?"

　The coach called out to him anxiously. Fumiya shook his head frantically and rushed up to the poolside to be near the coach.

"Excuse me, coach…… I'm having a bit of trouble getting the strength right…… I think my form might be off. Can you give me some advice?"

　The coach put his hand on his chin and looked Fumiya up and down for a moment, then gave him some advice in a calm tone of voice.

"With your body shape, it might be easier for you to catch the water this way. Don't be in a hurry. Check your strokes carefully first."

　Fumiya nodded deeply in agreement with his coach's instruction and dove into the water again. He swam with an awareness of the form he had been taught, checking the sensation of gripping the water firmly with his palms. Little by little, he began to get a feel for it. The axis of his body became stable, and his arms and legs began to work in tandem to transmit power. 【Fumiya Yoshikawa】's swimming experience and 【Tomoaki Inagaki】's physical ability gradually mesh together, and as he makes each turn, he can feel his body becoming more comfortable in the water.

　With each stroke of his arm, the water feels as if it is breaking apart. With each kick of the foot, the body stretches forward. Fumiya felt a sense of control over the water that he had never felt before.

　At the end of the practice, it was time to measure his time. Fumiya's time was two seconds shorter than his personal best.

"Hey, Yoshikawa, what's wrong? You're absolutely sharp now!"

　At the sound of the coach's voice, a buzz of excitement spreads among the club members. Fumiya, catching his breath, walks up to the poolside and quietly chuckles in his mind as he towels off his wet body. Inside his wet swimming trunks, his excitement swells uncontrollably. The elation he got from being in the water and the immoral feeling of having shortened his time with Inagaki's body lit a fever inside Fumiya.

＊

　When Fumiya arrived home, he found two pairs of shoes lined up at the entrance that had not been there in the morning. Apparently, Fumiya's parents had gotten home before him. Neither of them had already left for work in the morning, so this was the first time they had seen each other since Fumiya's body had changed. Fumiya stopped at the doorway and took a deep breath.

"Welcome home, Fumiya."

"Dinner is ready."

　What came back from the living room was the voice of his parents, so routine and usual.

　Fumiya entered the room with trepidation, but found his mother standing in the kitchen in her apron and his father watching the TV news. Neither of them seemed to notice anything unusual about Fumiya's appearance at all.

　Dinner was already prepared at the table. Tonight's menu was a hearty, meat-centered meal of ginger pork, potato salad, and miso soup.

　When Fumiya arrived at the dining table, he picked up his chopsticks and first modestly took a bite or two of his meal into his mouth. Soon, however, his speed increased. As was the case in the morning, once he started eating, he could not stop. He gobbled down the white rice and stuffed his mouth full of ginger pork. He scooped out potato salad and poured miso soup into his mouth. His appetite knew no bounds.

　Finally, he opened the lid of the rice cooker with a bowl in his hand and poured in a mountain of rice into it.

"You eat a lot, have you been hard at club activities lately?"

"Umm, yes…… a little bit. I feel kind of hungry."

　Eventually, after having had two second helpings of rice, Fumiya got up to put away the dishes. At that moment, he felt uncomfortable at the sight of his parents standing in front of him.

(……Eh, were they both this small?)

　His father's and mother's eyes, which until yesterday should have been almost the same as his, are now one head lower. The difference made Fumiya's heart flutter. He realized once again that his body had been swapped with that of 【Tomoaki Inagaki】. And the perverse pleasure of the fact that it was unmistakably real.

　Fumiya headed for the bathroom with a secret excitement in his heart.

＊

　Fumiya entered the bathroom, took off his clothes, and stood in front of the mirror. He took his time to look at his body again, and it was still very powerful to see him completely naked.

　Fumiya looked at his current body as if he were licking it, and stroked every inch of his muscular body, which was covered with body soap foam, with his large palms. He admired the power hump formed by flexing his arms, and traced the raised pectoral muscles as he slid the lather over them. As he continued to crawl his fingers to his abs, thighs, and buttocks, 【Tomoaki Inagaki】's whole body trembled loudly as if it was pleased.

　And then, the crotch. A hand with bubbles unconsciously reached out to that place where bristles grew like a jungle.

"Oh……♥"

　The reaction was quick. The moment he touches it, the huge cock begins to expand as if it were warped. Inagaki's palm allows him to grip it, but it is so thick that Fumiya's original palm would not be able to grip it.

(Oh my gosh……)

　If he starts masturbating here, he will not be able to stop. Fumiya somehow managed to catch his breath, rushed to wash himself, and left the bathroom.

──But the fever did not cool down.

　After wiping himself with a towel, Fumiya returned to his room and sat down on his bed, still feeling the continuing heat. The heat was returning to the lower half of his body. The fan was blowing, but he could not stop his breath from rising. Thirsty, sweat trickles down his neck. The urges that he suppressed in the bathroom are once again swirling throughout his body. He cannot control it.

　Fumiya stood up and took off the T-shirt and underwear that had replaced his pajamas.

　In the mirror, the body that had been trained through wrestling was reflected in an imposing appearance. In his groin area, a huge cock, incomparably larger than Fumiya's original one, was erecting while a clear thread was dripping from the tip.

(My sexual desire…… is getting stronger. It's just like Inagaki-sensei……)

　Inside the two small chicken-egg-sized testicles, there must surely be a massive production of boiling sperm, one after the other.

　Fumiya wrapped his trembling fingertips around his blackened cock. It was so powerful and full of presence.

(Inagaki-sensei's cock…… but now…… mine……)

　In a whirlwind of shame, pleasure, and immorality, Fumiya instinctively moved his right hand. His legs unconsciously opened wide, and his left hand gently stroked and rubbed his ball sack. This is a completely different method of masturbation from the one Fumiya usually performs. Fumiya immediately understood that this way of masturbation was based on the experience Inagaki's body had gained over the years.

"Hah……♥ Nmmm, it's soooo good♥♥"

　As he meditated and listened to his own voice, it sounded as if Inagaki was moaning with pleasure.

"【Yoshikawa】, your hand job is good……ohh♥♥ I'm cumming! 【Yoshikawa】, I'm gonna cuuuum♥♥♥"

(Inagaki-sensei……! I'm gonna come with sensei's body♥)

　As soon as Fumiya became aware of that, he quickly rushed to the limit. His log-like thighs trembled and his hand movements accelerated. His twitching cock swelled up, trying to expel its desire──

──Dobyu, bupyuuuuuuh! ……Dopu……dokun……byukuu……!!

　A large amount of cum was sprayed into the mirror. The thick white mass poured all over the area, spreading a foul smell. The cum, which was as thick as jelly, stuck to the mirror and walls.

"Haa……♥ Haaaa……♥♥"

　He felt his core heat and tingle. Pathetically, he twitched his erect cock and reached out with his tongue to lick off his semen splattered on the mirror.

"This is the taste of Inagaki-sensei's semen……♥, it smells fishy, it's sticky…… and it's soooo exciting♥♥"

　One shot was not enough to quench his sexual appetite. Fumiya continued to masturbate while breathing hard through his nose. He was puzzled by the fact that he had lost track of time and his penis had not wilted even after firing three times, but he enjoyed himself to the fullest using his 'ideal body'.

＊

　On a weekday morning, Inagaki woke up to the sound of his smartphone alarm.

　The morning sun shining through the gap in the curtains was comforting to his sleepy head. His head was still a bit fuzzy, but he slowly raised his body and got out of bed.

(……Somehow, I feel lighter today.)

　After stretching lightly, he opened his dresser drawer, first putting on a jockstrap and then a polo shirt over his head. 'There is no discomfort. What I put on fits my body perfectly. In the mirror, I see myself as usual.

"Alright, time to give it my best today!"

　Thickly sliced bacon and two fried eggs. Serve a large bowl of rice, pour hot water into instant pork miso soup and add green onions. And don't forget the natto (fermented soybeans). It is Inagaki's style to eat a hearty meal in the morning.

　However, his chopsticks stopped unexpectedly soon. He had eaten less than half of his usual amount, but he was full. Inagaki was puzzled by the fact that he was clearly not eating as much as usual. He could think of no physical condition that would cause him to lose his appetite, and only a strange feeling remained in his heart.

　Even as he prepared himself, his body seemed to be telling him that something was different from usual. But it was not a definite ailment.

(Well, sometimes these days are just like this.)

　After regaining his composure, Inagaki put on his jersey and left the house to head to school.

　Every time he is greeted in the morning by the students he meets on his way to school, he suddenly notices the angle of their gazes. Many students look down at Inagaki from above. Something is not right. But he never got to the reason why.

＊

　In the end, throughout the day, Inagaki could not figure out what the mysterious feeling of discomfort was, and after school, as usual, he headed to the gymnasium to watch the wrestling team practice. The students had finished their preparatory exercises on the mats and were waiting for their turn to spar.

"All right, I'll be your opponent today too!"

　Saying that in his usual tone, Inagaki changed into his singlet and stood in the center of the mat. Inagaki's policy is to have the coach himself work with his students to sharpen their fighting skills. But──

"Excuse me, coach!"

　Inagaki was unintentionally thrown off balance by the tackle of a third-year club member who came at him with great vigor. Unable to hold his ground, he was lifted up lightly before he had time to resist, and his back hit the mat as it was.

"Are you okay!? Sensei!"

　Inagaki raised his hand and replied to the worried the club member who rushed toward him.

"……Yeah, I'm fine, I'm fine."

"I'm sorry, sensei…… I didn't think I could beat you."

"You've really bulked up. Great tackle."

　Inagaki replied with an air of normalcy. Despite the smile on his face, a wave of doubt swirled in his heart.

　Inagaki was repeatedly knocked down, defeated, and rolled over in sparring sessions with other members of the club. Wiping off his sweat, Inagaki exhaled deeply. He had never imagined that he, who had competed in national tournaments, would be beaten so easily by his students, even when he was serious.

　As the surprised eyes of his students stared at him, Inagaki felt an unexplainable uneasiness spreading through his chest.

＊

　A week after Inagaki began to feel a faint sense of discomfort. Practice for the wrestling club was over, and silence was returning to the gymnasium in the evening.

　Inagaki watched from a corner of the gymnasium as the club members were busy tidying up their mats. He had been their sparring partner almost every day for the past week, and Inagaki was still getting knocked down easily. However, not only the club members but even Inagaki had come to believe that this was now the norm.

　As Inagaki pulled the shoulder straps of his sweaty singlet and wiped the sweat from his neck with a towel, he heard footsteps of someone approaching him from the gym entrance.

"……Inagaki-sensei, can I have a moment of your time now?"

　He looked up and saw Fumiya Yoshikawa standing there.

　He is a student in Inagaki's homeroom class and a member of the swim club. He is a petite and quiet-looking student, but lately, he seems to be wearing a different atmosphere than before. However, Inagaki does not know what is the reason for this feeling of discomfort.

"Hey, Yoshikawa, what's up?"

"I'd like to ask you for some advice……"

　His eyes were serious. Inagaki nodded, put off getting dressed, and urged, "Well, let's talk in the P.E. teacher's office."

　They left the gymnasium side by side and headed for the P.E. teacher's office. On the way there, Fumiya did not say anything, but simply walked quietly next to Inagaki. Inagaki thought it was somewhat strange that he seemed to be about two sizes smaller than Fumiya.

　When they arrived at the P.E. teacher's office and Inagaki opened the door, Fumiya entered after him and slowly closed the door. Then there was the sound of the door being locked with a click.

"……Yoshikawa? Why did you lock the door……?"

　Inagaki asked, and Fumiya turned around with a serious look on his face.

"I have something I need to tell you, sensei."

　Inagaki felt a slight chill run down his spine at these words. Fumiya stepped forward and said in a low, controlled voice.

"I don't know if you can believe it, but we've…… swapped. Everything but our faces."

"What are you talking about……?"

"Think back, sensei. Have you noticed a loss of appetite or a change in eye level in recent days? Have you been having trouble sparring with your wrestling club members?"

　Inagaki was speechless at Fumiya's question. Too many things come to mind. However, he could not believe that it could be connected to the unrealistic story of the student in front of him, such as 【Swap】.

"Still, you look like you're not convinced. But we were living for a week with our bodies swapped with each other's."

＊

　Fumiya slowly took his smartphone out of his pocket and held the screen out to Inagaki.

"Take a look at this……"

　On the screen of the smartphone was the editing screen of a photo processing application. There was a clearly unbalanced composite photo of Inagaki's muscular body with Fumiya's somewhat childish face pasted on top.

　The moment Inagaki saw the image, his eyes widened.

"……This is……"

　Inagaki finally understood the true nature of the discomfort he felt in his body. The food he could no longer eat, the discomfort he felt whenever others looked down on him, the sparring sessions that had lost their power──. This was the cause of it all.

"No way…… really, our bodies are……"

　Fumiya nodded quietly to Inagaki, who muttered in a trembling voice.

"Swapped. A week ago, I edited it with this app and…… woke up in the morning and this is what happened."

　Inagaki looked at Fumiya, biting his lip.

"……Please, Yoshikawa. Put it back on. I'm a teacher. And as the coach of the wrestling club, I can't continue to live in your body like this……"

"It's okay, sensei. I did my research."

　It was a lie. But Inagaki didn't doubt it.

"I heard that once we connect deeply…… we can go back to the way we were."

"What the hell does connect deeply mean?"

"Sex."

"What?! Sex……!?"

　Inagaki was absolutely mortified and backed away. But Fumiya continued, taking a step forward.

"If we don't, we're going to stay like this! And it's like there's a time limit, and if we don't have sex today, we can't go back to the way we were completely! Are you sure you want to do this, sensei, for the rest of our lives?"

"No, it's not okay!! But how can I believe such a story!?"

　Fumiya grabbed Inagaki's yelling arm and pulled him closer, unexpectedly pressing his lips against Inagaki's. Inagaki is surprised at the momentary event, and before he can react, Fumiya inserts his tongue into his mouth and plays with it. Inagaki tried to wriggle out of the kiss, which was the first time he had been kissed by a man since his senior year at school when he was a goofball. But Fumiya, on the contrary, held him tighter and violently fucked him in the mouth.

"Mmmmfuh……, Inagaki-sensei…… I love you……♥"

　The moment Fumiya, his cheeks flushed, whispered in his ear, Inagaki felt a thrilling sensation run up and down his spine. Even though he tried to resist, his whole body was aching sweetly for the body of 【Tomoaki Inagaki】 who was now in front of him. Fumiya sat Inagaki down on the sofa and sat himself down next to him, and then repeated the temptation further in his ear.

"Please trust me, sensei. Let's cooperate and get back to our original bodies……♥"

　Inagaki found himself facing Fumiya and lapping his lips hungrily.

＊

──And then, the sex began.

"Sensei, come on…… I've prepared this asshole for this day, ready to receive a man's cock……"

　Under his bulging muscles, his ass was thrust out in a lust-inducing manner. Once Inagaki was exposed to the large, pink, quivering hole, he had reached the end of his patience. During the past week, Inagaki's crotch had been touched on numerous occasions by the members of the wrestling club. Until now, Inagaki had tried not to think of it as just his imagination, but ever since he was pressed into 【Fumiya Yoshikawa】's body, he had always had agonizing desires.

"It's all right, Inagaki-sensei. I'll take care of you♥"

　Fumiya said and gently removed the singlet Inagaki was wearing. He deliberately made his body close to Inagaki's so that Inagaki would get aroused while taking it off, causing his cock to get harder and harder, and he couldn't stop his pre-cum from overflowing.

"Yoshikawa……♥"

　It was so sensual, even though what was in front of him was his own body just a few moments before. The chest is so thick that his cheeks seem to sink into it when he hugs it. The back with its muscles rising up majestically, as if it is dependable. Tight, yet full and assertive hips. The hairy butt hole is open and eager to receive Inagaki.

　Inagaki grabbed Fumiya's waist, placed his cock against the hole, and thrust deep into it at once. Inagaki's voice was involuntarily choked up at the feeling of the mucous membrane tightening, not loosely, but firmly.

"Ohhh…… Yoshikawa!"

(I can't believe…… my cock feel good…… in 【my】 body. No, this is Yoshikawa's cock now……)

　He was about to lose his head. The act of using 【Fumiya Yoshikawa】's body to fuck his former self──【Tomoaki Inagaki】. It was a much sweeter and more perverse event than he had imagined.

"Oh♥ ……Ah ahh……, sensei……♥"

　Inagaki's hips slammed even harder as Fumiya's sweet voice began to leak out of his mouth. The low voice is lovely. The voice he remembers hearing. Inagaki wanted to listen to Fumiya's voice more, feel him more, and indulge in his body.

　Inagaki was ejaculating inside Fumiya when he felt a massive release of dopamine from the back of his brain. At the same time, a powerful wave of orgasm hit his entire body, pushing him to a climax that nearly knocked him unconscious── that was the moment. Gradually, Fumiya's face began to change.

　His thin eyebrows became thicker and darker, and his forehead was marked with wrinkles that exuded a man's coercion. His eyes became sharper, and Fumiya's pupils, which had once held a gentle, clear light, changed to resemble Inagaki's. The bridge of his nose becomes bony and prominent, and every time his nostrils widen, he lets out a ragged, beast-like breath. His mouth becomes thicker and more muscular, and the contours of his lips are clearly defined.

　Noticing the change, Inagaki gulped in a breath and muttered.

"……What, Yoshikawa……?!"

　The face of the man he was facing slowly changed to look exactly like him. Inagaki's whole body trembled with a thrill as he witnessed the change. It was an intense urge that could neither be described as pleasure nor fear. In addition, Inagaki felt his facial parts squishy deforming. It was a strange sensation, as if his nose and mouth were being pinched and pushed in. The contours of his face were changing little by little──

"Nnnngggghhhh~~~"

　Not only his body, but even his face is changing to look exactly like Fumiya's. Even though Inagaki tries to refuse to accept it, 【Fumiya Yoshikawa】's body demands 【Fumiya Yoshikawa】's face. The sensation of his whole body being swapped with 【Fumiya Yoshikawa】's made Inagaki's uncircumcised cock tremble, and he ejaculated for the first time as 【Fumiya Yoshikawa】, showing an ahegao face.

＊

　Fumiya found himself lying on the sofa in the P.E. teacher's office, overlapping Inagaki. Not in his uniform, but in the singlet Inagaki always wears.

　The thick, taut chest, thick arms, and muscular legs that he had caressed so much over the past week. And a manly face to match his strong body.

───There was already the complete figure of 【Tomoaki Inagaki】.

　Sweat drips from his forehead, and the smell of sweat rises from his singlet as if it were sweltering. 【Inagaki】's── no, his own body odor. A raw, wild, male scent. It stimulates Fumiya's nostrils and numbs his brain.

"……Yes…… Finally……♥"

　Standing in front of the mirror in the P.E. teacher's office, Fumiya── or rather, the man who had already become 【Tomoaki Inagaki】 exhaled deeply as he gazed enraptured at his own reflection. When he turned around, he saw 【Fumiya Yoshikawa】 in his school uniform on the sofa, curled up in a small ball and sleeping.

　His expression was calm, as if nothing had happened, and not a trace of the former 【Tomoaki Inagaki】 remained.

"……【Yoshikawa】, wake up."

　Fumiya slowly touched Inagaki's shoulder.

　Inagaki gradually regained consciousness while rubbing his eyelids. Reflected in his blurry vision was the figure of a strong man wearing a singlet.

"……Me……? Have I returned to my original body……?"

　For a moment, Inagaki almost thought that he had returned to his original body, but he soon realized that it was not 【himself】.

　The man in front of Inagaki── his body was exactly like Inagaki himself. The muscular arms, the muscular torso, and the rugged face on top of it, were indeed that of 【Tomoaki Inagaki】. There is nothing strange about it. Except that it was not Inagaki himself who was controlling that body──.

　Inagaki opened his eyes wide in surprise.

"Hey…… Yoshikawa, what the hell is going on? Weren’t our bodies supposed to go back to normal?!"

　With a trembling voice, he crowded Fumiya. But Fumiya laughed, lifting the edge of his lips slightly.

"What are you talking about, 【Yoshikawa】? Our bodies have returned to normal. Our bodies and faces match, and 【I】, the wrestling club coach, is wearing a singlet. There's nothing strange about that, right?"

　To the stunned Inagaki, Fumiya slowly walked over and put his hand on Inagaki's shoulder. A large, rugged palm. And his tone was calm and carried himself like a proper teacher

"But…… it's different…… this is not right, you're──"

　Inagaki was about to continue, when suddenly a memory of his days as a teacher until today flashed in his mind. But the images gradually blurred.

　Instead, he remembered the temperature of the pool water and the way the swim coach taught him to breathe. And the short stature complex that had plagued him ever since he was a little boy.

"What…… is this……? No……, this is not my memory……"

　Fumiya whispered in Inagaki's ear as he held the confused Inagaki in his arms.

"This time we were lucky and our bodies were returned to normal, but don't ever use any suspicious apps again, 【Yoshikawa】."

　Inagaki's body trembled at the low voice.

"Oh, um…… I'm sorry……"

　As he said it, he felt uncomfortable with his own words.

'I'm sorry'? 【I】 am the teacher. Why would I say that……

"What, you still need something, 【Yoshikawa】?"

　Fumiya stares at Inagaki with a dubious look on his face.

"……No……"

"You can go now. Good luck with swim practice. I'm rooting for you, 【Yoshikawa】."

　The name repeated from Fumiya's mouth.

　Every time he is called 【Yoshikawa】, the memory as 【Tomoaki Inagaki】 gradually disappears from Inagaki's brain. Instead, what flowed in to fit there were the past and feelings as 【Fumiya Yoshikawa】.

──I'm…… I am……

　The sense of discomfort he had felt had already disappeared. Gently raising his head, Inagaki── or rather, 【Fumiya Yoshikawa】 quietly left the P.E. teacher's office.

　After seeing his back off, Fumiya stood in front of the mirror, playing with the outline of his nipples, which were asserting themselves through his singlet. He had a fauxhawk haircut and a sexy, masculine face. From his neck to his shoulders is a series of raised muscles, and veins are visible on his thick arms. The line from his chest to his stomach is thick and tight, and the symbol of his manhood is clearly visible around his lower abdomen, which is wrapped in a singlet. Every time he twists slightly, the muscles ripple and a bead of sweat glides across his skin.

"……Now, it's perfect."

　There was a swooning heat in his voice as he muttered that. His cock, dripping copious amounts of pre-cum, was erect inside the singlet. Admiring his own body, 【Tomoaki Inagaki】 slowly stroked his own crotch. His handsome face in the mirror contorted in satisfaction.

　Then he slid his hand into the singlet and began to twirl his thick fingers around his cock and jerk off it, letting himself be enveloped in the pleasurable scent of the man's sweat rising up from his entire body.

(End)