Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/9619313.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      M/M
  Fandom:
      ワンパンマン_|_One-Punch_Man
  Relationship:
      Genos/Saitama_(One-Punch_Man)
  Character:
      Genos_(One-Punch_Man), Saitama_(One-Punch_Man)
  Additional Tags:
      Bottom_Genos, Alternate_Universe_-_High_School, High_School, Sex, Smut,
      vagina_genos, Crossdressing, genos_is_in_a_seifuku, genos_is_pantyless,
      Teacher-Student_Relationship, Teacher_Saitama, Student_Genos,
      bottomgenosweek, Bottom_Genos_Week, bottomgenosweek2k17
  Series:
      Part 2 of BottomGenosWeek2k17
  Stats:
      Published: 2017-02-07 Words: 1826
****** Cyborg Seifuku ******
by asiankittee
Summary
     BottomGenosWeek2k17
     Day 2: Alternate Universe/High School (both sorta?)
     "We shouldn't be doing this-"
     "It's a bit late to be saying that now, sensei."
Notes
     I did put an underage warning on this because it's in a high school
     setting
Genos was wearing it again. That damn seifuku. And it was shorter than the ones
earlier this week! Saitama was a teacher at City X high, he taught health and
PE to students, always clad in a blue track suit instead of some stuffy
uniform. They alternated every day from PE to health class, and today was
Friday, a health day. Monday, Genos had been wearing the seifuku and when
Saitama approached him about why he was wearing it instead of the usual slacks
and button up, he replied "There's no rule stating I can't wear it, Sensei. It
isn't against the dress code." The cyborg was right, and of course Genos would
know better than Saitama so he didn't even question it. If there was no rule
stating a male student couldn't wear a skirt, then he couldn't make Genos
change. So, he had to deal with the ensuing torture of seeing Genos in and out
of class in such an outfit that really Saitama believed was getting shorter
every day. And today was even shorter! It was barely covering his crotch and
ass! Saitama was pretty sure that when Genos walked into his class and turned
to walk to his desk towards the back corner he saw the bottom of his ass cheeks
peeking out. He had to tear his eyes away before he got red and his bald head
sweaty.
Teaching class was even harder, because he was drawn to the way Genos'
beautiful metal legs looked in thigh highs, the way his skirt moved when Genos
shifted in his seat in the slightest, staring at him with those gorgeous golden
eyes. It was very distracting. However, as Saitama explained about muscles in
the body and how they worked, students taking notes and focused, his eyes
drifted to Genos and he caught his eyes. More specifically he watched Genos
spread his feet out first beneath his desk, and then his knees. Saitama's words
stuttered suddenly and he felt his eyes bulge out as his face flushed and his
eyes diverted. His students looked curiously at him and one, called Mumen,
raised his voice. "Saitama-sensei, are you alright?" Saitama struggled through
a coughing fit and nodded.
"Y-Yeah, yeah I am--" He could feel Genos' stare on him, could hear the way he
shut his legs but rubbed his thighs together slowly and his mind was going
south to the gutter fast. Very quickly he resumed the lesson despite his mind
reeling about what he had just witnessed. Once he passed out a test for them to
take he was able to sit at his desk and feign he was doing some work like
grading papers, when in reality he was freaking out.
Genos wasn't wearing any underwear. None. Nada. Beneath that short ass skirt,
Genos had no underwear, no briefs, no panties, absolutely nothing covering
himself up. Nestled between those thick metal legs was a mass expanse of smooth
black material - it reminded him of Genos' neck - and there were folds. Lips of
a vagina, that were slick and wet and glistening - as if begging Saitama to put
his mouth to Genos' cunt and suck. Who knew - maybe there was a dick hiding
somewhere too. Or were his parts interchangeable? For wearing no underwear, a
vagina was the best to be concealed because an aroused dick could easily be
seen especially under a skirt. Wait a minute! Why were his thoughts heading
this direction!? He should not be thinking about his student like that - no
matter how good looking he was and how much it seemed sometimes like his
student was coming onto him.
Thank god at least he could have the students bring up their tests - it was
torture when Genos came up, trying not to stare, not to look when he sat down
and his legs had parted slightly - and teach the rest of class sitting down.
Saitama had a very painful erection and in his track suit pants it would be
easy for anybody to see.
The bell rang for students to switch to their last class of the day and Saitama
didn't have a next class, the other PE and health teacher Bang having the last
class of the day since it was rather small and not enough to split between the
two teachers. "Genos," He called out, still seated, looking as the cyborg
looked up at him from putting his things away into his bag. "Can you stay for a
moment?" He had to mentally pat himself on the back with how together his voice
sounded despite his elevated heart beat.
"Yes, sensei." Fucking hell Genos' voice sounded sultry like some temptress.
Genos packed up his bag and instead set it on a desk up front, standing by
Saitama's desk as the last person left the room, leaving them alone in silence.
Saitama swallowed hard. "You wanted to see me, sensei?" Genos leaned against
the side of his desk and Saitama's eyes darted to the edge of his skirt, only
just hiding the teasing sin he had witnessed earlier beneath. Saitama cleared
his throat, nodding.
"Yes I did." He stood up, quickly adjusted his pants and shut the classroom
door, locking it. No one would be coming down here anyway. He was at the end of
the PE hall, after the gymnasium in the last rinky dink classroom and only if
students had class with Saitama would they venture that far. Saitama quickly
returned to his seat, sitting back slightly from his desk and he was looking at
Genos, hands clasped on his stomach. He looked up at Genos, chair turned to
him. "You..." Saitama started, aware of Genos looking him over, noticing he had
an erection that still hadn't gone down in the slightest. "You're not wearing
any underwear... that's indecent exposure." Especially for his heart.
"Is that so? I had no idea." Genos had a teasingly coy voice as he rounded the
side of the desk, leaning his hip against his desk, standing in front of
Saitama. From how low his chair was he could almost see everything. He could
see the beginning of the black mesh material and his mind flashed back to what
he saw. He swallowed thickly. Genos leaned his hands back briefly on the desk,
the skirt giving a brief peek of that glistening, beckoning heat. "I'm just
going commando."
"Your skirt does not meet the required length - and got shorter every day."
"Have you been watching me?" Genos smirked and Saitama opened his mouth dryly
before shutting it. "Sensei...isn't that preying on an innocent student?" He
said, though he approached Saitama, leaning forward till his hands were resting
on the arms of his chair and Genos' bangs were tickling his face. He smelled
like strawberries and apples.
"Who's been spreading their legs, showing their dirty self during class to
their teacher?" He countered rather quickly. Before he even knew it Genos' lips
were upon his and his hands had unfolded to clasp his hips and guide Genos to
sit in his lap. The kiss heated up and as their lips and tongues parted, Genos
was breathing breathlessly while Saitama was quite calm, surprisingly. Saitama
could feel it. Genos was pressed just right against his erection, and he could
feel the wet heat through his track suit. He groaned at the feel, and Genos'
lips were pressing down on his again. This was sinful, and they should not be
doing this. But Genos' hands were moving him so easily, making him lift his
hips slightly, he gripped Genos' hips harder, as Genos tugged his pants and
underwear down just enough to spring his erection free. A primal urge rose up
in him as his dick slipped right against Genos' folds so easily and he could
feel Genos' moans against his lips before it reached his ears through the kiss.
It barely took anything for Saitama to lift Genos' body and push it against the
white board, grinding them together, desperately wanting to just push himself
inside his student, inside Genos, drive him as crazy as he's been driving
Saitama.
Genos coaxed him with moans and a very filthy, "I stretched myself before and
during class." It made Saitama throb and drip pre-cum, his hips surging up and
suddenly the head of his cock caught between Genos' folds nicely and-
He moaned, and breathed against his lips, "We shouldn't be doing this-"
Genos moaned as Saitama pushed inside of him all the way. The blonde pushed his
head back against the board. "F-Fuck.." He let out shakily, moaning as his legs
wrapped around Saitama's waist. He then smiled, looking at Saitama with quite
the loving expression. "It's a bit late to be saying that now, sensei." He
kissed Saitama's temple. "I've been dreaming of this, and knew the seifuku
would appeal to you... I caught sight of those dirty hentai mangas you keep in
your bottom drawer." Saitama could feel his ears flush in embarrassment. He
kept them since this period was free, so why not jerk off or read manga if he
didn't have papers to grade? And he did have to admit, most of them included
girls in seifukus.
"I like it.. it looks good on you." Saitama groaned as Genos moved his hips in
a circle, his hand rubbing over his thigh thigh, over the silky material of the
thigh highs he was wearing. "But the no underwear... so dangerous."
"I was careful I didn't flash anybody but you, Saitama-sensei." Genos' words
made Saitama begin to thrust suddenly, and the impatient pace began. Genos
moaned, clutching onto Saitama's jacket, crying out his name as Saitama fucked
into him good. It felt so good, the way Genos squeezed around him, insides
trying to pull him deeper, and the pleasure he felt from feeling Genos' juices
around him. Honestly, he should be using a condom after preaching about safe
sex earlier in the week - but did it matter since Genos was a cyborg? Or was it
more the principle of the thing he should have considered to put one on? Well,
partially to blame was Genos and his overzealous eagerness to push Saitama's
rationality out the window and fuck the life out of his student. He'd worry
about the consequences later.
Their climaxes synced together; Genos squeezed around him tighter than ever and
Saitama spilled deep inside of him. Easily, Saitama's cum and Genos' cum
slipped out around his cock and began to drip down to the floor and onto his
sneakers. Saitama panted, face pushed into Genos' neck where he left quite a
few hickeys in the possessiveness of his orgasm, and Genos was gripping the
back of Saitama's head and the back of his jacket tightly in his hands. Both
did their best to catch their breaths after their hurried act.
"I'm going to get fired if you don't kill me first." Saitama breathed out
finally, and Genos simply laughed.
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