Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/7930129.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      M/M
  Fandom:
      モブサイコ100_|_Mob_Psycho_100
  Relationship:
      Hanazawa_Teruki/Kageyama_"Mob"_Shigeo
  Character:
      Hanazawa_Teruki, Kageyama_"Mob"_Shigeo
  Additional Tags:
      Crossdressing, Frottage, First_Love, Fluff_and_Smut, Plot_What_Plot/Porn
      Without_Plot, Seduce_your_crush_with_math_problems, Making_Out
  Stats:
      Published: 2016-09-01 Words: 3087
****** Absolutely No Ulterior Motives ******
by twitchtipthegnawer
Summary
     If there's one thing Teru both enjoyed and was good at, it was being
     a leader. Whether it was subjugating a bunch of delinquents or
     guiding young espers to train their powers, he liked it when people
     looked up to him. So there was absolutely no chance that he'd say no
     when Mob asked him for tutoring. It was just that, well, Teru was
     fourteen and completely unprepared for what he found in Mob's closet.
Notes
     For my friend Greenie! 1) Because her awesome fic motivated me to
     catch up to the manga and it was so worth it, and 2) because I'm that
     person who disappears from social media for months with absolutely no
     notice and I kinda feel guilty lmao.
     I hope you enjoy the filth and also that the Mob Psycho 100 anime
     continues kicking ass the way it has been. A+ adaptation, I adore it.
     (Also reminder that I take requests on tumblr.)
“What are you doing, Hanazawa-kun?”
Mob asked the question with the same deadpan tone as always, but it didn’t stop
Teru from jumping nearly a foot into the air. It wasn’t like Teru was trying to
snoop. He was just a bit curious, and figured a peek into Mob’s closet while he
was downstairs getting tea wouldn’t hurt.
“N-Nothing!” Teru said, guiltily shutting the closet. Maybe Mob would assume he
hadn’t seen… that. “I was just a bit curious about what kind of clothes you
like.”
“I don’t like crossdressing,” Mob said, so matter-of-fact that Teru was left
gaping at him dumbly. “Master Reigen had an assignment at an all-girls high
school that he couldn’t get permission to go in.”
That was a perfectly reasonable explanation. Perfectly reasonable, except that
now Teru knew for certain that some girl hadn’t left that uniform in Mob’s
closet, he’d actually worn it. “Right, okay,” Teru said, voice wavering
slightly.
Setting the tea on his desk, Mob smiled at Teru. It was as small as all of his
smiles were, but the tiny upturn of his lips was so endearing that they lit
Teru up from the inside more than any huge grin could. Most of the time,
anyway. Because right now Teru was mostly thinking about Mob smiling while
wearing that outfit.
“So, uh. You needed help with math homework?” Teru tried to get the night back
on track, and luckily Mob seemed content to do just that.
“Yes,” said Mob. “My teacher said that I need better grades. Can you help me
with this problem, Hanazawa-kun?” Then Mob held up the textboook, open to a
unit on geometry, and Teru found himself blinking hard at it, waiting for the
numbers to develop another digit or something.
Well, if Mob seriously needed help with this, then Teru’s job was going to be
pretty easy. “Do you know the first step to solving the problem?” Teru asked,
trying to gauge exactly how far behind Mob was.
In the end, their studying session was effective. Teru barely thought about Mob
crossdressing the whole time. And Mob successfully solved two problems on his
own, which was apparently unusual for him. Teru was pretty sure that Mob wasn’t
actually that bad at math, because when they broke down the steps far enough,
he tended to get it.
Afterwards was a different story. Teru went home to his quiet, dark apartment,
and tried to resist the urge to get on his computer. But he was only a teenage
boy, after all. He figured it couldn’t hurt, and he could always delete his
search history afterwards.
                                  ----------
I did it, read the email. Teru grinned down at his phone, pride swelling his
chest. Mob had attached a picture of his test score, a big, red 72. It wasn’t a
great score, but it was certainly better than Mob had been doing before Teru
had started tutoring him.
Congratulations, he typed back. This was more than just a little satisfying;
Teru had worked damn hard to get Mob to learn how to calm down when his mind
blanked on answers. For someone who looked so emotionless, Mob got nervous
easily. It was adorable.
There it was. The downside to their weekly meet ups. Teru had maybe developed a
tiny bit of a fixation on Mob’s appearance. Of course, it didn’t go beyond
surface level (Teru was very insistent on that, no matter what Hoshino said),
but it was still distracting. He could blame it on hormones, but the number of
times he’d had to cover an inconvenient problem with a strategically placed
textbook was getting ridiculous.
Teru’s phone chimed again, drawing his attention to a new email from Mob. Do
you want to celebrate? Suddenly, a terrible idea occurred to Teru.
Mouth dry, he responded, Sure. Why don’t we meet at my house on Friday? I’ll
cook.
Sounds good, Hanazawa-kun. Do you want me to bring something? Oh, Teru did, he
was just fairly certain that he really, really shouldn’t.
Going against his better judgement, Teru typed what might be the most
embarrassing email of his young life. The high school uniform. If you wouldn’t
mind. He stubbornly refused to type the word please, he wasn’t going to stoop
to begging. And if Mob asked him to call it the girl’s high school uniform, he
might actually implode.
After an hour with no reply, Teru was forced to plug his phone in to stop it
from dying. He distracted himself with television, but it really wasn’t enough
with the way his head was buzzing. As soon as he heard the faint sound of his
phone, he waved his hand and pulled his phone to him with a frankly excessive
amount of telekinetic power. If he hadn’t caught the phone, it would’ve smashed
into the wall hard enough to break.
One word. Okay. Just okay, but it made Teru’s stomach finally unclench from the
ache that had been steadily building since he’d taken that dumb risk.
Then the reality of what he’d sent hit him, and he felt like he was on the
verge of panicking. He’d just asked Mob to bring the uniform. He’d just asked
Mob to bring the uniform. He couldn’t count on Mob not understanding why he
wanted it, either, and-- Mob had agreed.
Shit, what if he showed up at Teru’s door wearing it already?
                                  ----------
The day came and Mob rang Teru’s doorbell, dressed in the same Salt Mid uniform
as always. He had a paper bag under one arm, though, so Teru still felt the
swell of anticipation that made him very glad he wasn’t prone to blushing. “Hey
Kageyama,” he said, the picture of casual confidence. “C’mon in, dinner’s
almost done!”
“Sorry to intrude,” Mob said, sounding as normal as Teru had. He took his shoes
off in the entrance, then shuffled into the kitchen on socked feet, clutching
the paper bag to his chest.
Stationing himself in front of the oven, which only had about a minute left
before it would beep to indicate the food was ready, Teru grinned at his
friend. “It’s nice having you here when there’s no emergencies going on,” he
commented. He got another small smile for his trouble.
Dinner was a baked salmon thing his mother had taught him to make before he’d
moved out. When he took off the lid with a flourish, he could tell that Mob was
impressed by it. “I didn’t know you could cook, Hanazawa-kun,” he said, eyes
glued to the dish.
“I have to, since I’m living alone,” he pointed out. Mob looked up at him, his
mouth slightly open.
With the barest hint of surprise in his voice, Mob said, “I forgot.” Then his
eyes flit down to the bag in his arms, and he blushed.
Damage control. Teru put the food on the kitchen table, smiling overwide.
“Okay, I’ll get the plates! What do you want to drink, Kageyama?”
Obediently sitting and putting the bag on the ground next to him, Mob said,
“Milk.” The two spots of pink on his cheeks were already subsiding, his
expressionless default already back. Teru was starting to learn the subtle ways
Mob’s face moved, though, and he knew he wasn’t feeling entirely normal.
Teru wasn’t feeling entirely normal either. He gestured too widely and laughed
too loudly all dinner long, but it wasn’t too awkward. He was used to how quiet
Mob could get sometimes, and filled the silence with chatter easily. He even
managed to coax Mob into explaining how he figured out a particularly hard
question on the test, resulting in another small blush when Teru praised him.
When dinner was over and the plates were stacked in the sink, however, the
awkwardness descended full force. On the table, the paper bag was like a
spotlight, drawing Teru and Mob’s attention constantly. “I’m gonna turn on a
movie,” Teru decided suddenly, making Mob jump a bit. “Do you want to, um… the
bathroom is through that door right there.”
Mob followed Teru’s pointing finger, his cheeks and ears both pinkening this
time. “Yes,” Mob said, snatching the bag off the table. He ran into the
bathroom suspiciously fast, but when the door slammed closed Teru let out a
relieved breath.
Turning on Porco Rosso kept him occupied for a couple of minutes. Then Teru
decided to make popcorn too, since they were growing boys and dinner hadn’t
been particularly big anyway. After that, there wasn’t much more to do other
than wait, and that was…
“Are you okay in there?” Teru called through the door. He couldn’t help but be
a bit impatient, considering he’d been waiting for this for so long that it was
embarrassing.
Instead of answering, Mob turned the handle on the doorknob. Teru quickly
stepped away from the bathroom, so that when the door swung open he could see
Mob’s whole outfit easily. And that outfit, yeah, it was definitely worth all
the stress to get Mob to dress up for him.
He was holding his hands at his sides stiffly, standing too straight and
uncomfortable. But the pleated skirt only fell halfway down his thighs, leaving
a large swathe of pale skin between it and his socks. His legs still looked so
slender, despite all the running he did with his club. The big, fluffy looking
bow at his neck was undeniably adorable.
“Cute,” Teru said, clearly surprised. Mob’s face went from pink to red
alarmingly quickly, especially considering how, despite his averted eyes, his
expression was still fairly impassive.
There was a beat of silence between the two of them, and then Teru said, “The
movie’s ready.” He sounded strained, but he turned around and marched into the
living room before Mob could comment on it. They ended up sitting on the couch,
a respectable distance between them. This did nothing except make Teru want to
touch Mob more, to find out if the girl’s uniform was any softer than a boy’s
was.
Ten minutes into the movie, Mob took off his red blazer. He draped it over the
back of the couch, muttering, “It’s too hot to wear indoors” when Teru cocked
his head at him questioningly. Nodding at the answer, Teru turned back to the
tv, but his attention was firmly on Mob again. Because that fabric looked
pretty thin, only a couple of shades whiter than Mob’s skin, and he couldn’t
help wonder if he’d be able to see a bra through it.
Wincing at his own train of thought, Teru tried to pay attention to the
familiar movie. It was so hard, though, because Mob was within arm’s reach and
sitting a little bit forward on the couch. If Teru wanted to, he could easily
just reach out and touch Mob’s back and satisfy his curiosity.
Before he realized what he was doing, Teru’s hand landed squarely between Mob’s
shoulder blades. The shirt was surprisingly coarse cotton, and of course there
wasn’t a bra strap under his hand. Teru didn’t know what he’d been thinking,
but all he felt was smooth skin and warm body heat.
Startled, Mob turned to look at Teru. “Hanazawa-kun?” He said, voice a bit
higher than normal. Just because he’s surprised, Teru reminded himself. It
doesn’t mean anything. Calm down.
“Ah, I was just,” and then because he couldn’t very well tell Mob what he was
actually thinking, Teru took a gamble. He pulled Mob closer by the shoulder,
scooted sideways until they were pressed together all down their sides. The
skirt hiked up a bit where it was squished between their thighs, and Teru
swallowed hard at the sight.
For about a minute, Mob was a statue against him. He relaxed in slow
increments, until finally his head began to list against Teru’s shoulder. One
of Teru’s arms was still slung over his shoulders, rising and falling with his
breathing. It was surprisingly comfortable.
They sat like that for so long that Teru almost forgot that Mob was
crossdressing, until he suddenly spoke again. It was hard to hear him over the
sounds of the movie, even though he was so close. “I had braids,” he said, soft
and almost shy. “When I crossdressed last time. I think I lost them.”
Something broke in Teru’s brain. One second he was sitting next to Mob like
normal, barely breathing because that admission was making him think things,
and then the next his hand was fisted in Mob’s hair. Mob’s silky, black, pin-
straight hair that had apparently been accessorized cutely.
And then they were kissing. Oh. It was chaste and short and not Teru’s first,
but when he pulled back and looked at Mob’s newly flushed cheeks he could feel
an answering blush in his own, which was. Irregular. “Kageyama, do you want
to,” Teru started. Then he swallowed hard, and whispered. “Can I do that
again?”
Quietly, Mob said, “I thought my first kiss would be with Tsubomi-chan.” He
looked dazed, and didn’t seem inclined to say anything else, so Teru decided to
take that as a yes.
He kissed Mob once, twice, three times, quick brushes of their lips that
wouldn’t scare the smaller boy off. This was one activity he felt genuinely
confident in; telekinesis might have helped him get girlfriends, but it hadn’t
exactly helped him kiss them. So he knew how to tilt his head to keep their
noses from squishing together, how to let his tongue brush lightly against the
seam of Mob’s lips.
All of the experience in the world couldn’t have prepared him for Mob’s
reaction. His spine curved, his whole body pressing against Teru like they were
magnets. His hands gripped the couch desperately, arms shaking as he sighed
into Teru’s mouth. They weren’t the only thing shaking in the room.
“Mob,” Teru said, half warning and half gasp. “You’re moving the tv.” Gentling
his hands in Mob’s hair, Teru trailed his nails over his scalp, unable to stop
despite the worry about property damage. Worst came to worst, they could
probably fix it afterwards.
“Sorry,” Mob said, breathy and hot. “Th-this is a bit overwhelming.” He didn’t
bother leaning back from Teru, so their lips touched with every syllable. Teru
only had so much self control.
Sliding his hands down to Mob’s shoulders, Teru pushed him onto his back. He
went much more willingly than he had before, allowing Teru to pull his legs
onto the couch and situate himself between them. When Teru braced himself with
forearms on either side of Mob’s head and began kissing him again, it occurred
to him that he’d never kissed a girl this long.
They were both breathing hard, and it only got more difficult to breathe when
Teru deepened the kiss. The sounds Mob made when Teru licked inside his mouth
were so quiet they could have easily been missed, but they were high and sweet
and perfect. He could eat those sounds. When Mob hesitantly pushed his tongue
into Teru, he closed his teeth around it, and oh the noise he made was as
delicious as Teru had thought it would be.
It was only when Mob suddenly bucked his hips in a stuttering movement that
Teru realized they were both hard. He pulled away, meaning to ask Mob if he was
okay, but then the sight of him hit Teru like a punch of psychic energy to the
gut. Eyes glazed and drool sliding down from his red, bitten lips. Skirt hiked
up so high that Teru caught a flash of white briefs he could almost imagine
were panties. Hands still holding onto the couch for dear life.
“Teruki, don’t stop,” Mob said. He sounded almost plaintive, a waver in his
voice that Teru had never heard before. A terrible part of him wanted to tease,
to get off the couch and see if Mob would cry about it.
But Teru had been trying to be kinder, lately, so instead he dove back in. His
hands couldn’t seem to sit still, stroking over Mob’s ribs and flat chest and
concave tummy. He was just so small, so unassuming and cute like a kitten, Teru
wanted to make him mewl.
Occasionally their hips bucked, out of sync and almost painful when Teru’s dick
pressed to Mob’s bony hipbone. It was frenzied and mindless, and even better
when Mob reached up and held onto Teru’s short hair like it was a lifeline.
Neither of them paid any attention to the crashing sound that came from the
kitchen.
Excited as Teru was, he knew he wasn’t going to last long. He was barely
holding himself back from shoving Mob’s skirt up, or undoing the bow and biting
at his neck. He’d been thinking and fantasizing about this for so long that he
could feel himself trembling in eagerness. So it was a surprise when Mob was
the one who came first.
A sharp cry tore from Mob’s throat. His spine arched, feet kicking a little in
the most endearing loss of control Teru had ever seen. “T-Teruki,” Mob gasped,
their kiss broken but oh he was everything Teru had thought he’d be, a perfect
disheveled mess with his hair fanning out on the couch and how much better
would this be if he was wearing silky underwear for Teru to rub against--
Like the teenage boy he was, Teru came in his pants, relying on the force of
his powers to keep himself from simply collapsing on top of Mob immediately.
They panted together in the aftermath, Mob squirming in discomfort before long.
The wetness spreading in Teru’s pants was pretty gross, but he was reluctant to
get up and relinquish the feeling of Mob beneath him.
“Shigeo,” Teru said, when he had enough breath back to speak without his voice
cracking. “That was great.”
Mouth falling open into a small, surprised o, a blush creeping up his face, Mob
stared at Teru. He was silent for so long that Teru felt nerves tweaking at him
through the afterglow, but then he smiled that tiny smile of his and replied,
“It was.”
Cleaning up ended up being more of a chore than Teru had thought, but as he
righted the flipped kitchen table and Mob straightened the spoons in his
silverware drawer, he thought it was worth it. Though next time, they really
should get undressed. Or maybe just Teru could get undressed, because Mob in
that skirt had been…
Next time was going to be fantastic.
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