Work Text:
Izuku wakes up feeling ropes binding his body. He is lying on his back with the underside of his back propped up on a soft pillow and his arms fastened to the respective bedposts over his head. The ropes force his legs to bend and stay together as they are drawn up with ropes attached next to the ones keeping his arms apart on the bedpost.
A ball gag has been shoved into his mouth and all he can do is look around frantically, helplessly as he is forced to lie on the bed naked with his every private parts exposed.
'What's going on...?!'
Suddenly, the door to the dark room flies open, revealing the familiar form of his mentor stepping in.
'A-All Might?!'
"Hello, Midoriya-shonen. I hope you slept well."
While Izuku cannot form coherent words with his mouth unwillingly gagged, his frantic noises are enough to show the former pro hero how surprised and panicky his student is. He doesn't give Izuku a single answer though, doesn't say another word and simply steps closer to the boy, uncaring about the teen's reactions.
The bed is small and appears to be tailored to Izuku's body, so when the former pro hero sits down on the foot of the bed, it's directly between the boy's forcefully spread legs. Reaching down over the edge, beyond what Izuku can see even if he peers down, Toshinori's hands eventually come back into the boy's view, this time gloved and with lube glistening on the elastic surface.
The teen's teacher reaches out with a hand and takes his student's soft dick into his big palms, making Izuku squeal despite the gag as the boy's body visibly jumps in surprise. Toshinori starts to move his hand up and down gently, using his long, lean fingers to rub the skin teasingly.
It doesn't take long for Izuku to grow embarrassingly hard.
Once satisfied with the boy's aroused state, the blond man takes off the gloves for a moment in order to fasten a blindfold over his successor's eyes.
Putting his gloves back on, the elder male then reaches down below the bed's edge again and pulls forth a sounding set, all the while stroking the teen's dick lazily, making sure that the boy's twitching member doesn't lose interest.
Toshinori takes out the smallest size, lubes it up generously and then uses the very tip to tease Izuku's slit. His prey jerks again and pulls at his bindings, nervous as to what is happening beyond his sight. Stroking Izuku's dick a couple more times, Toshinori then eventually holds the very head in place and slowly pushes the tip of the metal sounding rod in.
Izuku screams and pulls at his bindings hard, his piss hole burning as it is forced to stretch around the unfamiliar intrusion. However, his mentor continues this torture, uncaring about Izuku's feelings.
Deeper and deeper the metal rod slides in, aided by the power of gravity and the elder man's careful guiding, until something bumps against the dick's head - a bulb to ensure that it doesn't get lost in Izuku's body - and presses against something very sensitive inside the boy's body that rips a cry out of the teen's throat.
"Mmhhh!!!"
Toshinori doesn't give Izuku any time to adjust and instantly starts to pull it back out completely, watching as the small opening struggles to close into a teeny, tiny slit once more before forcefully pushing the metal rod back in. Izuku's piss hole burns and twitches around the hard intrusion, convulsing around the metal stick as his mentor starts to set a brutal pace for fucking into a hole that isn't meant to be fucked so rigorously.
The boy arches his back, his fingers and toes curl tighly and the pain is setting his nerves on fire. However, under all that pain lies something else though, something more... pleasant. The feeling becomes the strongest when the sounding tool slides in completely and hits the teen's prostate. Eventually, Izuku's cries and whimpers grow into breathy moans and groans as the pleasure begins to grow.
"Hm... Ngh... Mmhhh!"
It's not enough though, it's not enough! Izuku wants to come so badly, but he simply can't when his passageway is stuffed and blocked by the metal rod. If it wasn't for the gag blocking his mouth, Izuku would have started begging for release by now, no matter how reluctant and embarrased he is.
Suddenly though, something cold touches his other hole just beneath his testicles and his body involuntarily jerks again in surprise. Toshinori circles his protégé's tight muscle with his finger, teasing it and spreading the lube before finally pushing the first digit in.
A whole body shudder wrecks Izuku's body as an unfamiliar feeling fills his entire being. His asshole, let alone his insides have never been violated in such a manner before and he is sure that they aren't meant to be played with like this in the first place. His mentor's finger wiggles and pokes around his inner walls, making Izuku whimper and struggle against his bindings once more. However, it's useless and all he can do is lie there with his arms bound above his head and his legs spread for the world to see. Eventually, a second finger slips inside and they start parting in all possible directions, forcing Izuku's slick passage to open with the fingers' motions.
The boy's hole burns due to the unfamiliar stretch and the unfamiliar direction it is forced to open up from. It twitches around his mentor's fingers, desperate to close up again tightly. However, Toshinori doesn't grant it that wish and instead lines his fingers up to finally strike against Izuku's prostate from behind.
Izuku howls as his most sensitive bundle of nerves is being assaulted from his anal passage, soon to be stimulated from the front as well as his mentor starts fucking his urethra with the sounding tool once more.
"Mmm!!! Mmfffhhh!!! Mmnngh!!!"
Izuku never had a dry orgasm before, isn't even aware that it exists, but he doesn't have to know that for his muscles to suddenly twitch and tremble, his insides convulsing around Toshinori's fingers as his hole flutters around the long digits. His back is arched off the bed and a long whine is drawn out of his mouth before eventually, he falls back onto the bed again.
His body isn't done though, not in the slightest, because while he had an orgasm, he didn't ejaculate. He is lying there, trembling from his orgasm, his body's oversensitivity and his physical need for release.
Toshinori doesn't let his captive rest though, instead opting to wrap his hand around Izuku's still hard length once more to pump it vigorously, making Izuku whine pathetically as tears start to peek out from underneath the blindfold. The poor boy's body fights against the restraints once more, desperate to flee the overstimulation, but that simply makes the elder man jerk the young boy's cock faster, tickling out a high pitched scream from his dearest student as his back arches again due to the strong stimulation before flopping back down onto the mattress. Then and only then does Toshinori let go of Izuku's dick and waits until his boy is away from the edge of orgasm again before continuing.
Slowly, the elder blond pulls out the sounding tool, making sure that his student can feel every inch of it scratching against the inner oversensitive flesh of his dick. Reaching down over the edge of the bed another time that night, Toshinori pulls forth a very long catheter and pushes one end of it halfway into the small, hidden opening in the silicone ball gag. The other end is forced into Izuku's oversensitive and twitching cock, making the boy's body jerk once more, cutting the teen's resting time way too short.
Toshinori continues to insert the length of the catheter into his protégé's body, deeper and ever deeper, until it eventually enters the teen's bladder. The elder blond then pushes the upper end in the silicone ball gag fully in until it comes back out inside Izuku's mouth and nearly instantly, the boy's piss shoots up from his dick into the ball gag, draining the teen’s bladder and isntead flooding the unprepared boy's mouth, making him gag on his own filthy fluids.
Toshinori isn't pleased by the reaction and uses one gloved hand to grip Izuku's face tightly, forcing it back so that his successor's esophagus is straightened out perfectly for the fluid to pass through eventually. Leaning his face close to a trembling Izuku's ear, the former pro hero whispers, "Drink."
Shuddering, Izuku eventually starts to swallow down his own piss after a lot of hesitation, more tears staining his cheeks after doing something so endlessly humiliating on his childhood hero's order.
Toshinori keeps Izuku's head forced back in that uncomfortable position until eventually, the boy's bladder has been completely emptied into his stomach. Only then does the elder blond let go, leaving Izuku a coughing and wheezing mess.
Pulling the catheter in Izuku's dick back out enough just so that the passage for the boy's cum is free again, the teacher pushes his newly lubed fingers back up his student's tight pucker, making the teen's unprepared body jerk. Without wasting any time, Toshinori starts pounding that sweet, sweet bundle of sensitive nerves inside his successor, pulling out delicious cries from the boy.
The older man doesn't touch the boy's cock, lets it flop up and down from the teen's accidental thrusts, watches as eventually, his successor's body convulses once more and shoots semen up the catheter into the boy's very own mouth. The freckled teen gags again as the bitter taste of his own cum splatters on his tongue, but Toshinori is quick to force Izuku's head back and whisper, "Drink."
Whimpering pathetically with more tears flowing down his freckled cheeks, Izuku reluctantly swallows down the bitter taste of his own semen, crying out quietly when he realises that the heavy taste of his cum still clings onto his tongue afterwards.
The boy's dick softens quickly, but Toshinori doesn't seem to care about that and simply lubes up a silicone dildo, lining it up and pushing it into the unwilling walls of his successor. Izuku cries out again, his body convulsing and trying to get away from the overstimulation, but he cannot escape the bindings his mentor has forced him into.
Toshinori thrusts the toy in and out of Izuku's hole lazily, making sure to aim it against his student's already thoroughly abused prostate. Eventually, once the elder blond sees the boy's cock twitch back to life again, the older man pushes the toy against the freckled teen's bundle of nerves and holds it there, soon setting the vibrator onto the lowest setting.
Izuku cries out nearly instantly as the vibrations immediately overwhelm his senses, making his back arch and his hips buck up, unsure whether to get away or seek out more. Toshinori doesn't leave the small body any choice though and instead presses the vibrator even harder against the oversensitive bundle of overworked nerves, rolling it in circles and teasing the heavily abused prostate even more with the motion. There is already precome dripping into the catheter up into Izuku's forcefully opened mouth.
Suddenly, Toshinori starts to pull the toy out and thrust the vibrating dildo back against his protégé's prostate, making the boy cry out even more despite his already numb flesh.
"Mm! Mmmhhhh!!! Nghhh!! Mhmmm!!!"
Even if Toshinori can't see it, Izuku's eyes eventually roll to the back of his head as his back arches in an inhuman angle. His muscles spasm as his body comes on the toy, his spread cock slit flooding the catheter with another fresh wave of his own cum that soon shoots up the small tube only to fill his mouth with its taste. This time Izuku is smart enough to swallow it down fast and Toshinori pets his hair.
"That's a good boy right there."
Slowly, the elder man pulls the toy out of his student after turning it off, setting it aside to clean later. Instead of doing that, the teacher unbuckles his pants and pulls forth his monstrous cock, lubing it up with some fresh, dripping lube. Lining it up with Izuku's quivering and trembling asshole, Toshinori forces his girth inside, making Izuku scream as his butthole explodes in pain.
Even after taking two of his mentor's big fingers and being fucked by a vibrating dildo, his hole wasn't prepared for the sheer length and girth of his mentor's rock hard cock penetrating his ass mercilessly. His hole is burning by the forced stretch and flutters around the invader helplessly.
Toshinori doesn't give his successor any time to adjust and instantly starts pounding that aching and hurting hole. The sound of skin slapping skin and the wet squelch of lube rubbed dry fills the otherwise silent room. Izuku is so overwhelmed that all he can do is take his mentor's splitting girth, making sounds that are cut off milliseconds later with another merciless thrust against his already numb prostate.
When Toshinori puts his hands on Izuku's hips and lifts the boy's lower body off the pillow to angle his successor's body better, the teacher speeds up for a few thrusts before slamming inside Izuku one final time. The taller blond has his cock aimed directly against the freckled teen's prostate and the force of the retired pro hero's cum shooting against the sensitive bundle of nerves has Izuku come again, semen filling both of his holes as his childhood hero fills his abused ass and his mouth is filled with his own bitter filth.
The poor boy is lying on the bed limply, his body completely exhausted from the multiple orgasms forced out of him, but Toshinori isn't quite done with him yet. Moving up until he is straddling Izuku's chest, the elder blond removes the silicone gag from his successor's mouth and shoves his softening dick into the wet heat of his protégé's upper hole.
Toshinori keeps forcing his dick into Izuku's mouth even when his successor gags on it, continues until the head of his cock slides inside the boy's esophagus, blocking the poor teen's airway, and starts to piss down his student's throat. Green eyes widen and Izuku struggles against his binds, both from the realisation that his childhood hero is pissing down his throat and from the quickly thinning supply of oxygen.
The retired pro hero notices, of course he does, but he doesn't show his captive any mercy. Instead, he grabs the back of his successor's head and shoves the boy further down on his cock, forcing his length further down the freckled teen's convulsing throat. Izuku's eyes are rolling to the back of his head and his consciousness continues to slip away and come back at a fast pace.
Eventually, just as the poor boy passes out, Toshinori pulls back out and the young body underneath him reflexively starts a coughing fit, trying desperately to get rid of the foreign fluids sticking to rawed places where they shouldn't be. Eventually though, the coughing dies down and it becomes clear that the excessive amounts of cum and piss are going to stay inside Izuku.
At the corner of his sight, Toshinori can see that his cum is starting to leak out of his student's abused hole and quickly shoves a lubed butt plug past the puffy rim struggling to recover from the torture.
The next day, Izuku wakes up to his body lying on a bed on its front with all of his limbs fastened to the respective bedposts. A fucking machine is shoving a dildo in and out of his puffy asshole in a lazy pace, apparently using white, sticky cum as lubricant.
The door opens and closes again and Toshinori steps into the room.
"Good morning, Midoriya-shonen!"