Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/5676109.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      M/M
  Fandom:
      ワンパンマン_|_One-Punch_Man
  Relationship:
      Genos/Saitama_(One-Punch_Man)
  Additional Tags:
      Porn_with_Feelings, Shota
  Stats:
      Published: 2016-01-09 Words: 6219
****** Love is a strange thing ******
by FujikoMine
Summary
     Genos gets a new body and Saitama is confused about it
Notes
     It's been years since I wrote a fic.
See the end of the work for more notes
Saitama has been staring at the ceiling for a long time; he isn’t in the mood
to leave his futon. Sunlight lazily enters his apartment through the curtains,
begging him to wake up.
 
Genos hasn’t return home.
 
It’s been two days without the noises and constant questions about shit he
doesn’t even think about but, it just isn’t the same. Besides, yesterday was
meant to be Genos’ birthday, or the date they both decided to celebrate as it,
the boy hadn’t had one in years. He sighs and closes his eyes. He should be
expecting him to return in a week at least, since his body was completely
shredded to pieces and the doctor said:
“You should take better care of your discipline”
His throat still forms a knot when he remembers the look he received that day.
He didn’t want a disciple to begin with, and now he is responsible for the
cyborg brat. How annoying.  He thought about it but at the same he feels an
emotional burden of thinking so selfish, after all, Genos was giving his best
and he hates to admit that he didn’t know how to take care of many things,
including his life in a way.
In fact, he has to admit he was looking forward to celebrate his discipline’s
birthday; he is ashamed to admit that he spent the past day searching all over
the cities to find something for the cyborg. The nicely wrapped box with a big
yellow ribbon hidden under a blanket was the shaming evidence.
He curls and covers himself beneath the blanket. He is hungry.
 
===============================================================================
 
“Teacher?”
He slowly opens his eyes, still with a blurry vision he manages to see blonde
hair and black eyes watching him from above.
“Genos? I thought you’ll be here by the end of the month”
He brushes his eyes and tries to sit upward, what time is it? The lights of the
day are now all over his apartment.
“I had to convince doctor to repair me quickly, since my birthday was meant to
be yesterday, but”
Saitama lazily yawns, waiting for Genos to end his sentence but as the time
passes he is surprised the cyborg is still silent, so he opens his eyes.
And he can’t figure out what is going on.
There was Genos, sitting by his side with his usual posture, but was he
considerably younger?
“Ah! Doctor had only this body ready at the moment, so…”
Was he nervous?
“… I consider this was the best option given the time, and I though there
wouldn’t be any problems since it will be for a week or two at most”
Saitama can´t quite grasp what the hell is going on, why there was a teen in
his room? Furthermore why is his heart beating so fast and why he can’t stop
staring at him?
“Teacher, I… I am so sorry is this causes you trouble, this is the first body I
was given and it lacks of all of my battle improvements, it is more human so I
can’t practice or go into battle, I should ha-“
“Calm down, it is okay”
Is it? He harshly thinks to himself as he pinches the arch on his nose, trying
to hide away this troublesome heartbeat.
“I just didn’t expect you to return like this”
He sighs and attempts to stand up until he abruptly realize he cannot.
“Again, why do you have this body?”
 “I was a teen when I lost my actual body, so the doctor thought that this body
was something I would prefer, but as I woke up I immediately asked for a body
more suitable for battle, I guess doctor was trying to make me more capable of
having a normal life?”
As Genos is speaking, Saitama gazes upon his newly teen body. It is mostly
skin, save for the articulations is his elbows and wrists, so he supposes is
the same for his knees and ankles. Is his skin paler? His hair definitely is
longer in the sides and he has the urge to run his fingers through it. He looks
like a perfect porcelain doll.
His stomach growls loudly.
“Ah! Im sorry teacher, let me cook … something for you, I should have noticed
you haven’t eat since this morning”
The teen stands up and Saitama watches him enter the kitchen. Noises of pans
and other clutter stuff fill the room. He just turns on the TV and stares at
it, absently doing what he does every morning, also he is trying not to think
too much about the boner he has right know.
This is not alright.
 
===============================================================================
 
He enters the kitchen to grab some water, but he stops there. Genos was
standing in his tiptoes trying to reach for some ingredients up in the
cupboards, making a poor attempt to grab the box of tea.
So small
“Here, let me help you”
Saitama easily grabs the item and passes it to Genos, his body brushing
slightly onto his.
“Ah! Thank you teacher, I still can’t get used to this body properly”
“If it is so troublesome, let’s go outside to eat something” he glances at the
mess in the kitchen “Also, I am in the mood of inviting you something to eat
since your birthday was yesterday, which that reminds me…”
Genos stares at him as he sort of runs outside and returns with the present he
had bought two days before
“Happy birthday”
He gives him the present that now seems bigger in the cyborg hands
“Teacher! You didn’t have to-“
“Open it; I think the only problem is that it will be bigger for you now”
 It was a white hoodie with a cartoonish tiger in the front; it was in sale and
Saitama though it would be funny because the other day his face looked like a
tiger when they were in a battle, but the size now was fairly bigger for Genos,
whom height is barely at the start of Saitama’s chest.
“Can I try it on?”
“I guess you can but you don’t really have to…”
Genos strips in front of him and he is breathless. His body is totally human-
like and slimmer. The hoodie fits like some sort of short dress on him.
“Thank you so much, teacher, I really like it!”
“Yeah, you look cute”
What?
Genos abruptly gazes at him, and it takes him a fraction of a second to look
away and walk to the bathroom. He can feel his ears hotter than usual.
“I’ll take a bath and then we should go out”
Shit
 
===============================================================================
 
He remembers know.
The hot steam of the shower eases him as he recalls that weeks ago King invited
him to play videogames. He had this new 2D dating game and he truly wanted to
Saitama to join him since this was like his favorite saga or something like
that.
Back then he accepted because the food was free and he enjoyed King’s company.
So expending the night with him was a simple decision. Once in there, King
revealed the title and it was some lolita’s bullshit that he didn’t really
cared, but he wasn’t going to pass the opportunity of a free meal, so he stayed
and watched King play that ecchi game for hours.
It didn’t appeal to him the idea to have a little girl all over him. Or anyone
for that matter, so the night was kind of boring and awkward at the last part
since King was clearly excited with this type of kink, later King stated that
he needed to go to the bathroom, and that was the cue for Saitama to leave.
Now, he didn’t think this could have awakened something inside him. All he
could think in this moment is Genos’ teen body and his cock twitches under the
caresses of his hand.
He wasn’t a perverted man.
Until now, apparently.
Why is he masturbating all of the sudden in his bathroom at the recent memories
of Genos standing in his tiptoes?
Is this a lame nightmare?
He hadn’t had sexual desire in a long time, in fact he can´t recall if he ever
had. A soft moan escapes him and his mind mocks him for the mess he is making
with the fact that he might be seriously horny for the teen in his kitchen.
It hasn’t come to his mind if he felt something for the cyborg.
This is too much.
 
===============================================================================
 
“Thank you for the meal, teacher”
Genos softly smiles and Saitama notices that the face of the cyborg is more
expressive than usual, even his voice sounds lighter and happier.
He is still wearing that stupid hoodie.
“No problem”
“What should we do now?”
“Do you want a dessert?”
“Well, I can eat a fair amount of food, so the question is if you want some,
teacher”
“Let’s walk then, and maybe we’ll find something”
Genos’ smile makes him want to punch a wall or his annoying heartbeat. So they
walk through the city in a casual search for a dessert, Saitama notices now
that he has to face downwards to look at him.
“Do you want something in particular, teacher?”
“Not really”
They walk and it suddenly feels like it always did. Genos was the same as usual
and that brings the older man a certain relief. As they walk across some
boutiques and clothing stores, some of them were stylish ones with mannequins
similar as Genos’ body.
“We should buy you new clothes”
“Ah! Don’t worry about it, since I will stay in this body for a little amount
of days there is no need for them, I can survive with my usual clothes if I
stay home”
“What about your underwear?”
Fuck
“Oh!... yeah I haven’t thought about it”
Is Genos capable of blushing now?
“It would be problematic to wash it everyday”
“Maybe we can find a sale nearby, I don’t really want to spend that much money
in this matters, and-“
“You worry too much, I’ll pay them”
“Y-yes!”
 
===============================================================================
 
Thankfully Genos opted to personally go and search for his underwear, so
Saitama gave him the money he needed.
He is sitting outside the store inside a big mall. He sometimes manages to see
him from afar and he sighs loudly.
What the fuck is happening?
Some other teenagers pass by and he feels guilty, but at the same time he
doesn’t feel this tingling arousal as he observes them. That really puts him at
peace, at least he isn’t lusting every teen now.  
Lies, it stills bothers him.
This abrupt realization of desiring Genos in his teen form is not what he
wanted to admit as love.Was he in love in the first place? Or was he just a
horny fuck? Maybe both. He didn’t like the idea of just finding this new model
the cause of his sudden sexual desires, this body is just temporal and besides,
was he attracted to Genos at all?
His self-called discipline has been with him for many months now, and he would
be bold if he didn’t admit he felt somewhat happier and there was this new
thing feeling-like sensation that he had been missing for a long time. He
accepts he enjoys Genos’ company; the teen is observant in his behavior and
even if he is kind of hard to understand at the first time they always manage
to come to a deal, the brat is always smiling at everything Saitama told him,
obeying him without a doubt, defending him fearless or worshiping him at the
most simple tasks.
Nobody has done this for him and he recalls the day he wished for at least
someone to look up at him.
Genos is running towards him and he finds himself smiling at him, the cyborg
definitely can blush now.
“I bought the cheapest of them, teacher”
Genos says proudly and he didn’t think twice before he ruffles his hair with
delight.
“You could buy whatever you like”
“Ah…”
A group of it seems to be mothers pass them by and Saitama can almost feel his
stomach flinch at the sight.
“Look, what a good father!”
“Is he single?”
“He is bald”
Saitama face grows redder and Genos is about to yell at the women, his body
tensing and eyes glaring a stronger hue of yellow. He can’t really put up with
this situation so he grabs the teen by his wrist and walk away before Genos
incinerates them in there, causing more problems in his life.
“T-teac-“
“Let’s go home”
He completely forgot Genos can’t burn things now.
 
===============================================================================
 
Saitama is making dinner this time and Genos is in his laptop browsing some
kind of heroes’ forum, meanwhile the TV is on and the news are forecasting the
possible appearances of monsters for the week or something like that.
Apparently there was a low level monster attack nearby but the hero opted to
take some vacations due to the current situation. The cyborg had already sent
an e-mail describing the state of his actual body.
Still if the monster was to be problematic Saitama offered to go, against the
reproaches of his disciple of him missing an important lesson or so he rambled.
Genos really was very different now, physically speaking. The hero observed him
form the kitchen in silence.
He is far more delicate. A familiar tingling is starting to build up in his
cock. He swears and looks away. Genos had always been this cute to be honest.
Saitama was the one who had to rescue him when the monster was beyond the
control of the cyborg. Not that he is upset by this.
He also wasn’t upset by the constant annoyance of having a discipline
worshiping him every now and then or picking up the broken pieces after a fight
or someone who he could spend the day doing nothing in particular and at the
end of the day he would still be there.
How stupid he was, he didn’t have noticed he enjoyed the company of Genos in a
way that was more intimate. He indeed was in love.
“Dinner is ready”
He announces and takes the curry outside. He feels kind of like a father, and
it just worsens his arousal.
Dinner goes as silent as usual, both of them staring at the TV but this time
Saitama finds himself staring at Genos.
His delicate face seems more fragile than usual and he has this urge of holding
him closer. Maybe carry him around so he doesn’t get hurt. He wonders if he
weights the same or if he is light enough to carry him with one arm.
He didn’t notice Genos was looking back at him.
“Is something wrong, teacher?”
“Ah, it is just that, I was used to your formal self”
“I’m sorry teacher, I should have waited then”
A sad grimace forms in his little face.
“No, this new body is cute”
Why is he so blatantly obvious? He curses to himself as he notices how the teen
is getting a soft blush around his cheeks.
“Ah... I’ll go to sleep”
He tries to hide his current state and walks away from the danger. Now he can’t
face Genos, he fears he won’t for a long time.
“Let me help you, teacher!”
Genos legs are so thin now, and he stares at him trying to take out the futons.
He sighs and he opts to go and change to his pajamas which happened to be near
the TV so he starts to strip while he is walking towards them.
He hadn’t put that much attention to his actions, but now he realizes this kind
of intimacy they shared it is not casual at all. Or maybe it was but now that
he is aware of this new feeling it is bothersome for him. He puts his pants
first of all and then glances at Genos.
“How are you going?”
Genos was finishing with his futon and currently undoing his jeans. He leaves
his hoodie on and his hands try to loosen it at the ends, it barely covers his
underwear and when he sits Saitama almost swears he can see a small bulge
between his legs.
“Fine!”
Genos covers himself and faces him. His eyes seem bigger than before, or they
seem so.
“Your bed is ready, teacher”
He gulps hardly and tries not to focus at the intense gaze the teen is giving
him. He coughs as if nothing is going on (is something going on?) and finishes
putting on his shirt, buttoning it was more interesting than everything else in
the whole world. He quickly goes and covers himself under the blankets, facing
towards the windows so he doesn’t have to face the little brat.
He closes his eyes as hard as he tries to erase the sight of the smooth legs of
Genos away.
“Good night”
“Sleep well, teacher”
King is going to pay for this.
 
===============================================================================
 
He swings into wet dreams of Genos in 2D ecchi games where he rubs with the
stylus in erogenous zones, making him moan and begging for more, and waking up
sweating just to angrily face the pillow; groaning at the painful need in his
cock and now he is dreaming the teen is walking through the TV screen dressed
as a slutty maid, crawling towards him, licking his own fingers teasing him
with little moans, whispering his name, asking him to come and fuck him hard.
He decides to just stare to the ceiling the next time he wakes up panting.  His
cum is feels lascivious against his tight, and somewhat sticky, dirty
nonetheless.
Genos is still sleeping; he hesitates for a long time before facing him, his
long blond hair falling beautifully in his pale skin, long lashes resting in
plumped cheeks, his chest gently goes upward and downward as he slowly breaths.
How much stamina did he have to have his cock this hard again?
Genos always had been this handsome, he admits to himself. Where was the trick
then? Why is his body urging this much to touch him and make him moan his name
endlessly with no shame? Was he this much of a pervert since always?
Maybe he opened a door that was meant to be shut down forever.
Right now he is helplessly way beyond in this hell as he strokes his dick one
more time.
 
===============================================================================
 
It smells of eggs and tea.
He opens his eyes with a low groan.
“Good morning teacher!”
He brushes his eyes and notices there isn’t a futon next to him and the TV is
on the news with the announcement of a monster level Dragon, waking him fully.
“Does the Hero Association called yet?”
“No, teacher, I think Tatsumaki, Bang, Atomic and King are currently dealing
with it”
“I’ll go”
He silently strips from his pajamas and rushes for his custom in the laundry
basket. A bath would be the first thing he should be doing right now, but the
need to punch something is stronger than everything else.
“At least, have your breakfast, teacher!”
He waved him off but the look in Genos face makes him whine resigned.
“Fine, bring me my plate”
He is still wearing the damn hoodie without his jeans that fucking brat. Genos
is quickly in front of him offering a plate with an omelet in one hand and his
cup of tea in the other hand with a strong determinate look in his eyes.
“You can’t go with your stomach empty, teacher”
“Yeah, I guess you are correct”
Saitama really appreciates the concern his discipline always shows for him, it
faintly makes him wonder if there ever was other in his life that treated him
this way. He gobbles the whole thing in least than five minutes and now he is
ready to go.
“Stay here; don’t go near the area, Genos”
“Understood”
The teen says militant as he nods and bends facing the ground.
Saitama playfully pats his head before leaving. He really needs to punch
something.
 
===============================================================================
 
He arrived just in time; Tatsumaki is at the edge of her powers, barely holding
down the huge onyx-human-like beast.  The others were lying unconscious near
her and King was nowhere to be seen.
He punched the monster into a rain of guts and blood; it didn’t relax him as he
thought it would so he waves at the other small brat before returning home. The
thing is that he almost ran for half of the day to get to this place, as he
made a mistake of going to another city that was way off the current place.
Genos was the one with the GPS integrated, not him.
So he arrives home almost at the end of the day, he is thinking that maybe
Genos is worried and he should cook dinner since it was his fault not asking
for directions before running out.
His hand is in the knob of the door when he hears a soft moan from the inside.
He remains there silently as other escapes through the walls.
Genos was masturbating, and the realization just makes him chuckle a little. As
if having him there as a teen-doll wasn’t a huge problem alone, now he is
hearing him moaning softly.
His hand slips from the knob to his side, and he lays his forehead in the door.
The moans are getting lewd and a little louder. He thinks he owns this time to
the boy since he is at least doing it in privacy.
Saitama also thinks if he is watching porn, what kind of porn is it? Is he
lying in the middle of the room or is he currently in the bathroom? In that
case he is a loud brat, not that he is complaining, really.
Also, was Genos capable of masturbating? Saitama was sure he didn’t have a dick
is his formal body, maybe this old model is indeed a lot more human like, dick
integrated and a tight little asshole.
He is rubbing his bulge mindlessly as he imagines the teen pleasing himself,
his soft hands running at a rhythmic phase in his dick and curling his little
toes just as he approaches his climax.
He wishes selflessly that Genos is masturbating thinking of him.
 
===============================================================================
 
“I’m home!”
He decided to enter when the smell of udon filled the hall.
Genos is wearing the shirt of his blue pajamas, revealing his almost naked body
and the tight gray boxers they must have bought the other day.
What a pleasant mistake.
“T-teacher!  I – I can explain!”
Genos face is brightly red, his golden irises glowing strongly and a whirring
noise fills the room.
Cute.
“Really? Explain then”
Saitama feels his voice getting a little husky; he can’t take his eyes away
from the almost nude cyborg in front of him who is currently facing the floor,
his ears glowing pink, and he can almost notice the steam flowing around him.
“I-I…”
He waits patiently in delight, unzipping his outfit way too close of Genos,
reaching for his pajamas’ pants that where beside him and almost brushing his
body against the teen. This situation is getting a little to lewd and Saitama
likes it.
“T-Teach...er!”
He is so fucking cute
His brain is taking a lot of strength in order to control the urge in his body
to just fuck him there. He exhales deeply, then he walks to the table and sits
in his usual spot, facing Genos, waiting and smiling in what he hopes an
innocent look.
Still, Genos is immobile, his hands curled in tinny fists.
“I… I was doing laundry and … I began to fill cold, and the only thing left was
your pajama, so I…”
“You mean you didn’t felt cold before?”
Genos shakes his head abruptly, his machinery making flexing noises and letting
out steam.
“This body is still hard to comprehend, I haven’t feel this human in a long
time”
There is clinginess in the last words that makes the old man worrisome.
“Genos, is everything okay?”
“I… I don’t know”
He faces him and Saitama is perplexed at the shrugged face Genos is holding
while his hands are making a mess of the shirt.
“Everything feels more intense, teacher, my hands touch things and I can feel
the textures, the temperature… I can feel the humidity sticking in my skin,
heartbeats of joy when I am watching the TV… this feels so anew for me… I … I
feel human… ”
Oil is starting to fall form Genos’ eyes; Saitama grabs his hand swiftly and
pulls him for a hug. He hadn’t realized all of this. Genos was a killing
machine, and has been for a long time and most of his teen years he spend
yearning of vengeance, this is sure a lot to take in, as he is also coming to
understand his new feelings as well, this new body has been a lot to take in
for both of them.
 “I- I am sorry teacher”
“Shhh, there is nothing to apologize for”
He gently pats Genos’ head and he can feel the teen hands in his chest, softly
touching him.
“I also didn’t thought about it”
Genos body is so tiny against him; he wants to hold him like this forever. A
moment after, things start to feel more relaxing so he releases him slowly,
looking carefully at him.
“Are you ok now?”
He nods silently, faint black lines in his cheeks.
“Can I… touch your face, teacher?”
They stare at each other, Saitama nods quietly, Genos’ eyes bright like little
stars and a small smile forms in this face. Standing in his knees, his hands
are starting to cup his checks with an intriguing look, coming closer to his
face to look more carefully at him.
They don’t speak as soft fingers trace every feature with a strong curiosity
and delicacy it makes Saitama blush, and a moment latter he closes his eyes as
he noticed how intense the look in Genos eyes had become.
It is when he can feel a faint brush of lips in his that he opens his eyes.
Genos gaze is foggy and somewhat shy.
“Teacher, I… always wanted to kiss you”
A click in the back of his head releases his desires as he stares at the parted
lips in front of him and leans in for another kiss, holding the teen face with
one hand, provoking a low gasp and a hissing sound form the insides of the
metal body.
Warm lips and synthetic skin is pressed against his chapped lips and it feels
so rare to be doing this. He had never felt the need of kissing someone, or let
alone desire physical contact and now his hands are desperate to touch and
discover the body in front of him, as if with this intimate contact something
will reveal him everything that had been hiding between his long forgotten
emotions and his burden sorrow.
Is this how it feels when you love someone else?
 “Tea…cher” His tongue licks almost shyly Geno’s lips granting a shiver and a
lewd expression in the teen. “I… had masturbated…” Saitama notices that he is
mostly talking to himself so he continues to kiss his neck, nuzzling at the
edge of his jaw and ear “I couldn’t stop thinking about you…I was worried… all
of my body felt warm and I… I wanted to feel your hands in me… I…”
“I heard you” Saitama bites his neck and gently licks the mark where his teeth
imprisoned the false skin provoking anther intense moan. The body of the cyborg
is starting to feel hotter and the little gasps that are feeling his ears are
far clearer than before “I could hear you moaning, like this” He stares at
Genos with a lust he had never felt before “I wanted you to think of me, Genos”
This time is Genos who leans quickly for another kiss; this time they both open
their mouths, letting a big moan escape the older man. A soothe feeling fuels
him from inside and he can’t stop smiling into the deep kiss, making slippery
sounds, he feels happy. His hands are touching the lower back of the teen body,
starting to go upwards while Genos arms are over his shoulders, his soft hands
caressing the back of his neck. 
They separate with a sticky noise, both of them panting and gazing at each
other eyes.
“Let me touch you more, teacher” the teen is at the edge of these new
sensations, just as him.
The TV is now running a program of a documentary of the sea life, filling the
room with noises of calming whales and a slow piano notes, while someone is
speaking. Saitama lifts Genos effortlessly with one arm behind his back while
the younger hero places his legs around his waist, hugging him closer. Saitama
grabs a blanket with his other hand, putting it as the best he could in the
middle of the room, sitting on it after. Silently he lets Geno’s hands run all
over his body.
Little fingers trace every inch of skin, making him quiver and hold his breath.
His heart is racing against his chest as he also can’t stop touching him; every
little part of the synthetic skin feels like melting under his fingers while
Genos can’t stop panting in his mouth. It was then, when he remembered the brat
is actually twenty years old.
This time he kisses him more hungrily, biting wantonly the lower lip, making
Genos shiver and moaning lewder, he slides his tongue inside his mouth. Saitama
haven’t really made out with somebody, he wonders if Genos had; he seems a
little more adept than he expected.
He pulls him closer, caressing his back and groping his ass, squeezing both
cheeks. Genos can’t stop moaning and panting and kissing and digging his nails
in this blades. They break apart, a wet trail of saliva lingers form each other
tongue.
“…Teacher” he pants and his face is so red and messy it makes Saitama heart
melt away. “Please… fuck me”
“I couldn’t say no to that face”
He slides the teen boxers away and lets Genos pull apart his pants, almost
instantly he pants sharply as his cock is released. He immediately notices that
Genos doesn’t really have a dick; in fact there is nothing in there, just a
bulge. He is about to ask when the cyborg takes his hand and places it softly
between his legs, gasping when his palm makes contact.
“I am sensitive there so you ca…aahn…” Saitama didn’t wait long enough for
Genos to end when he rubbed gently with his palm, making the teen whine and
arch against it. It feels warmer and softer than all of the cyborg’s body; he
massages the zone, feeling very aroused as Genos is rubbing against the motion,
hiding his face in his neck and moaning without hesitation ‘teacher’ every now
and then.
“Teacher… let me suck you” Genos whispers against his ear and makes his cock
twitch in advance. He doesn’t need to reply as one hand is already stroking
him.
“I didn’t know you where this perverted”
Genos smirks and lowers his head as he kneels between his legs, he starts with
a long lick from the base to the tip of his cock, pressing a soft kiss at the
head.
“Neither do I”
His cock disappears inside Genos’ mouth and Saitama groans helplessly. He grabs
him by his hair and the next thing he feels is almost making him come; Genos
sucks in and twirls his tongue around. He can’t help bucking his hips against
the cyborg, making him moan, the vibrations feeling like heaven against his
cock.
“Genos...”
The boy looks at him and he is tearing oil. The sight is far too erotic and he
is fighting against the urge of coming right there, he wants to last longer and
at the same time he wants to fill Genos’ mouth with his cum. That is the last
thing he can think of as the brat starts bopping him, panting and gasping for
air his head falls back in pleasure. 
The moans that are leaving his body are new to his ears and he almost feels an
outsider of this new wave of pleasure. There isn’t a consistent thought inside
him; he is just feeling his blood boiling and his body asking for a release he
hadn’t desired ever in his life.
It feels so good.
It is when his body tenses and his hand harden in the cyborg head when he
comes. After a couple of seconds he opens his eyes and stares at Genos, who is
currently licking his fingers with the white liquid that is everywhere; the
brat is looking at him lasciviously.
Saitama can’t hold it back anymore and he grabs his chin firmly; pulling him
for a kiss. He can still taste the savor of his cum, making him grow more
addicted to this new sensation. He pushes him down on the blanket and slides
one hand all the way to the younger boy ass. He is relieved when there is a
small hole that is promptly teased at the entrance with one finger.
“Teacher!” Genos eyes closes suddenly at the pressure down there.
“Say my name this time”
The cyborg shakes his head and refuses to look at him. Saitama is already
licking his fingers due to the lack of lube. Where is this shyness coming from?
“Say it”
Genos covers his eyes with his hands and breathes heavily.
“Sai… ta… ma…”
He pushes in one finger, slowly.
“Again”
“Sai… tama”
“Again”
“…Saitama”
He takes one hand away from the cyborg face and he is completely red. He kisses
him as he swirls his finger inside. Genos is moaning louder and now he is
panting his name as he touches inside him.
He manages to fit another finger inside and his cock is already dropping precum
in the navel of the teen.
“More…please…” Genos looks at him and his legs quickly grabs him by his waist
“I wanna feel you” he moans in his ears as he takes out his fingers.
Saitama had lost the track of his thought long ago, acting almost as he knew
what was meant to be done. He is now gently pushing the tip of his cock in the
entrance, fearing it to be to raw for the cyborg but against all he could even
imagine the cyborg pushes himself without hesitation, making them both moan and
tense.
“Don’t be so reckless, brat” 
He hisses against his mouth and trusts him.
“It only makes me fuck you harder”
Genos can’t articulate words as he is being fucked, screaming his teacher name
as Saitama trusts him recklessly.
“Aahn, Saitama… Aaahn… It feels so… ahn... good…”
Hearing him like this just fills him with more desire. He pushes apart and
Genos is complaining but not for long as he is turned around to his knees and
there is no advice as Saitama pushes in, granting him the most lewd sound Genos
had ever made. He holds him by his hips as he trusts in deeper. Genos’ face is
pushing the blankets and tears are forming in his eyes, hands at the sides
holding for dear life. This is a sight he is sure he won’t be forgetting soon.
He can watch at the exact time when Genos eyes rolls to the back of his skull
as he comes gasping for air, shaking uncontrollably beneath his hands, also
tightening his asshole thus making Saitama come after a couple of trusts.
The room is filled with heavy breaths and the smell of oil and sex. He feels
sticky and tired when he realizes what he had done. He falls besides Genos’
side and covers his face with one hand.
“I have never dreamed of this, until you returned with your new body”
The TV is still on and the noise it makes is pleasant to Saitama ears, as he is
really fond of watching it.
“Tea…cher…”  Genos was reluctant now to say his name, but now it doesn’t matter
to him. “I… I think I wanted this for a long time”
He removes the hand in his face to look at the younger man beside him, Genos is
staring at him intensely, his lips still panting and a soft red blush all over
his face.
“I think I loved you for a long time”
Saitama smiles at him
“Yeah, me too, but I recently discovered this”
Genos eyes bright like little stars going super nova at the words he just said,
making him blush and avert his gaze to another place. What a fucking brat he
had fallen for.
The boy suddenly comes closer and nudges his head at his sides, sliding one arm
and placing it in his chest, the act provokes a warm feeling in his heart and a
tingling sensation behind his ears. He hugs him and spoons him with his body,
just as he had read in some mangas before.
“I’ll ask for a penis for my new body”
“Shut up”
End Notes
     I love shota.
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