Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/11535381.
  Rating:
      Explicit
  Archive Warning:
      Choose_Not_To_Use_Archive_Warnings, Underage
  Category:
      M/M
  Fandom:
      モブサイコ100_|_Mob_Psycho_100
  Relationship:
      Kageyama_"Mob"_Shigeo/Reigen_Arataka, Kageyama_"Mob"_Shigeo_&_Reigen
      Arataka
  Character:
      Kageyama_"Mob"_Shigeo, Reigen_Arataka
  Additional Tags:
      Plot_What_Plot/Porn_Without_Plot, Reigen_has_the_perfect_size_for_Mob,
      First_Time, Nothing_goes_out_as_they_planned_it
  Stats:
      Published: 2017-07-18 Words: 4536
****** To your perfect size ******
by reimoblover
Summary
     Please read the tags, this is reimob... I guess it was very clear.
     This is a translation of one of my many one-shots reimob in Spanish.
     Maybe then publish the other.
     Thank you so much Mel-chan for helping me translating my fic ily <3
     If there is something wrong written please let me know about it.
Notes
See the end of the work for notes
That day Mob went out of school earlier than usual. Its not that he didn’t had
classes or something like that, he simple decided that he couldn’t wait more
time to see his dear Master Reigen. So with the help of his powers and without
anybody seeing him, he jumped out of the institution, and went in direction to
the office of the spiritual consults.
It was summer, so the sun warmed more than necessary. His skin started to burn
by the light. He had to cover himself so he wouldn’t get hurt and also because
he was still wearing the school uniform while there were still classes so that
could cause him troubles, if someone caught him on his escape.
Maybe he should have thought about it better.
He thought it was a great idea to get there earlier than usual so that way he
could spend more time alone with the adult.
The time they spent together after school –discarding the exorcism work- was
too little. Or that’s how the little Shigeo saw it.
On the way to the office he went through a market and tried mixing together
with the people.
It didn’t work.
He noticed some people started to whisper behind his back. It was better if he
could get rid of his clothes soon.
He sneaked in a spot of clothes of second hand and grabbed the first thing he
found. It was a big coat and a hat that hid his face perfectly. He got away
without being noticed and disappeared between the tumults of people.
According to his watch, in his school it was barely lunch time. Finally he was
meters away from the office, so he decided to speed up his steps. Because it
was too early, his Master would probably be eating breakfast. And it wasn’t
still the time for the first client to arrive.
There was enough time.
He went up the stairs and pushed the door in front of him, making a little bell
ring. The adult was sitting behind his desk reading relaxed on his computer.
Shigeo was right about that he would have been eating. The oldest was putting
some takoyakis on his mouth.
Without taking his eyes off the screen, the man with blond hair said that it
wasn’t time to receive anyone yet, to come back later. It was his lunch time.
The young boy left his backpack fell on the side.
He decided to take a deep breath to then let out the words he had been waiting
all day to say to his boss.
-¡I WANT TO HAVE SEX!
The adult behind the desk was startled. He choked on his food and started
coughing uncontrollably. Shigeo with the help of his powers gave him a punch on
the back and the older was able to throw away a wood stick that he had stuck on
his throat. He panted and when his face went back to his natural color, he
raised his sight to the kid that had already taken his hat off, leaving exposed
his face fully ashamed.
Reigen had identified very well the voice of his young apprentice, but never in
his life he would have imagine hearing those words.
-…M-mob… ¿What did you just said?
The little black amber squeezed his lips diverting his eyes to the other side
of the room. His bangs were covering part of his face, in which a striking
scarlet red color was appearing. He moved his arms letting the coat covering
him fall.
The adult felt his jaw fall. Mob was completely naked in front of him. He felt
a knot on his throat and a suffocating heat invade his body. The inferior part
of his abdomen started to tickle.
-… I-I want to have s-sex… with you, Master.
Mob placed one of his hands in between his legs, covering himself in shame. The
other hand was grabbing the arm under the elbow. His sight was nailed to the
floor.
Reigen didn’t know how to answer, he couldn’t even move. He was totally stunned
for what had just happened, but he couldn’t stop looking at that little
tempting body in front of him. He started to sweat. He loosened the knot on his
tie.
On a sudden movement he was centimeters away from the little one, leaning on
one of his knees. He placed his hands over the little hips making the white
skin of the young psychic bristle. His heart was beating extremely fast but he
was not aware of the emotional turmoil inside of Mob. He was worried, but that
didn’t stop him from delicately massaging the anatomy of his little disciple.
It felt so good. Warm and extremely soft.
He let out a sigh.
-¡…!
He felt his skin being covered by the clothes he threw away moments before. The
older covered him with the coat. He then stood up and gave him an hug and long
kiss on his forehead.
-My little Mob… ¿Where did you get this ideas from?
Said while still hugging him, looking down on his expressionless eyes.
-Go home… We will talk later.
Said caressing his dark hair, to then get away from him, but he saw how Shigeo
was holding tight to his suit. The young teen started to cry disconsolately.
-¡N-noo…! ¡I-I want it n-now!
-Mob… I-i cant. I cant do it.
-¿¡W-why n-not!? …M-master… ¿Perhaps you don’t love m-me?
The heart of the little one started to break and his powers began to manifest
for the rejection of his mentor. Tufts of his hair started to get up and
various objects of the office floated above them.
It was horrible… It hurt, it hurt so much. The person he admired the most and
that he loved with all his being, didn’t feel the same for him.
He wished he never had that stupid idea.
-¡Of course I love you!
¿Eh?
-B-but i… ¡Aaagh!
I-i don’t want to hurt you
¿That was the matter?
His master loved him… ¡And he also wanted to have sex with him! He was just
worrying because he didn’t want to hurt him.
-¡Masteeeer! ¡I will be fine! ¡Please! ¡I-I want to do it now! ¡Please!
¡Please! ¡Please! ¡B-before the clients arrive! ¡Please! ¡Please! ¡Please!
¡Please!
Mob was pulling his suit back and forth again and again.
It looked like the typical scene of a father and his son who begged for a new
toy. Of course he wasn’t the father and Mob wasn’t his son… and the toy that he
wanted was forbidden for most of the kids his age. Better said, forbidden for
every kid.
-¡…Masteeeer! ¡Please!
Reigen passed one of his hands through his hairs pulling them backwards, he was
frustrated. In his mind there was a war between what was right and what not to
do in a situation like that.
But the problem was that he wanted to do all that was wrong, even knowing that
it was bad and forbidden. He was dying to do it… And even more with Mob
pleading, inviting him to make him his. Giving him absolutely every permission
and consent.
-Aaah… All right.
-¡Haah! ¡¿Really!?
The eyes of Mob shined dazzlingly. He hugged him tightly making his coat fall
and leaving his little body naked again. He was anxious to feel the body of his
master over his.
Reigen took him to the couch and made him sit over his legs. He placed his
hands over his hips again and started to caress and squeeze them a little.
-Tell me, Mob…
-Nng… ¿Yes?
-¿Have you done this before?
-N-no Master… never.
The older one smiled and pulled the young psychic closer to him. Until they
both could feel their breaths against each other. His face started to blush
more and more. He grabbed his inferior lip with his fingers pulling them
softly.
-¿And kissing…? I suppose you already gave your first kiss ¿Didn’t you?
Shigeo denied it.
-Hah… ill have to teach you then.
He pulled from his inferior lip until they meet with his. Mob was startled for
the introduction of the tongue of the older one on his mouth. He felt how he
touched every part of his mouth and their salivas mixed. It felt disgusting,
but it tasted really good. Just because it was his Master the one kissing him.
His face rubbed against his chin where his beard started to grow; it was a
little bit rough but the sensation filled him with warmth. He loved it.
Suddenly he felt a pressure against his little member. He separated from the
older one and covered his noble part with his hands, completely ashamed.
Threads of saliva fell from his mouth and his lips slightly swollen. Reigen
wanted to keep on sucking them until they were about to explode. They tasted so
damn well.
-¿Whats the matter?
-I-i…
His hands pressed between his legs. Reigen took one of his little arms, making
him know that it was ok and to let him see. Mob denied it with his head.
-Mob… ¿Have you ever touched yourself there?
-…
He was too ashamed to answer.
He didn’t want to tell him that he did it every night thinking about him. He
always thought that his Master was really charming and since he began his
puberty he couldn’t take him out of his head. He was the reason of his wet
dreams. He cursed his hormones, that only got wildier every time he saw him and
his unstable emotions didn’t help at all to calm them.
-Just do what I tell you. ¿Is that ok with you?
Shigeo nodded.
Reigen caressed his lips again and started to put a couple of his fingers on
his mouth. Like if it was a reflex Mob started to lick them. They were salty.
Reigen took the little member of the kid and started to masturbate him. Moans
escaped from between his lips but he didn’t desist the job of moisten up the
fingers of the older. It helped to shut his screams down.
Reigen was having fun seeing him squirm over him. How he jumped over his legs
and made his pants get harder with the friction of their bodies.
-¡Mmng!
The little one bit on his fingers when he came. A shiver made him jump and then
fell over the chest of the older one. And he hid on his neck.
Reigen felt a little bit of pain with the bite but he thought that it was
pretty erotic and decided to not complain. He placed him over the couch and
started to take off his cheap suit.
This was really going to happen, Shigeo thought. All of his fantasies were
going to come true. He was finally going to have sex with his Master… At last
he was going to be his.
He was watching Reigen get undressed in slow motion.
First the coat, he threw it on his feet.
Then the tie, the knot faded like silk.
Button by button he opened his shirt.
¡¿Why was he taking so long?!
-¡H-hurry!
The adult laughed at this impatience.
-Soon you will ask me to slow down.
The face of the little one turned on even more. He watched how he took his legs
and placed them over his hips. He decided to close his eyes and wait for the
dreamed sensations. But he never expected for what he felt next.
A terrible pain possessed him.
-¡Ahhhhrg! ¡N-nooooo! ¡Take it out!
Shigeo started to kick and cry, trying to push him away from him.
Reigen tried to hold him, until he was pushed to the nearest wall by an
invisible force. He bounced against the floor and twisted in fetal position.
With little strength he turned to see the little one crying outrageously on the
couch.
He had only put one finger inside of him.
.
.
.
-…Mmn… Aah… Mob.
Reigen was lying on the bed, watching how his little student devoured his
member.
-Oh… God… Yes.
He took the head of the kid and pushed it against him to go deeper on his
throat. He heard Mob whimper a little bit. Maybe he was losing his breath… or
maybe he was penetrating him too fast. He decided to ignore it, especially
because he was about to come.
-¡Aahh!
He grunted, while he filled his mouth with his semen. The kid got away from him
and started to cough and spit the rest of it. He panted in search of air.
-Im sorry, Mob.
-D-don’t apologize… im the one that is sorry. Im sorry, for hurting you that
time.
That accident in the office had happened a couple of weeks ago. Mob had gone
there supplicant to have sex with the older one. But nothing happened how he
had imagined.
When Reigen was preparing him so he could go inside him, Mob had felt how his
little hole broke with the introduction of his finger.
The hands of Shigeo were small and slim in comparison with the hands of his
Master. That’s why he didn’t had troubles caressing himself, but when Reigen
did it… it was like he was being torn apart.
Blinded by the fear, his powers went against him.
Mob exploded in tears… He had injured the person he loved the most. The same
person that teach him to never hurt anyone.
His wounds weren’t serious… Just some bruises, but he almost broke one of his
ribs.
-I-im so sorry… Master.
He said between sobs.
After that day, Shigeo decided to please his Master in another way… So every
time he could, he asked his Master if he wanted oral sex, to what Reigen
acceded more than happy.
-M-master.
Mob called to him, letting his back fall on the bed and opening his legs for
him.
-I-I would like to try again. I-I think that this time I will be able to resist
it.
With one of his hands he grabbed his buttocks, opening it up and leaving his
hole visible.
The adult went over him. Mob closed his eyes and waited to be kissed.
The kiss never arrived. He felt how the adult got off the bed and pulled his
pants up.
Mob was irritated, but his face didn’t show it, it was something only Reigen
could tell.
-We already talked about this… No… until you grow enough.
-¿And when will that be?
-I don’t know… we just have to wait.
Mob left out a groan in anger. Reigen said good bye, not before telling him to
go see him early to on the office the next day.
.
.
.
He was wearing his uniform, because he was going to school, but remembered that
Reigen wanted to see him that morning. He woke him up with a call and sounded
really cheerful. Mob wanted to know what was that about.
He went in the office and Reigen was waiting for him like always, sitting on
his desk. Everything was the same as always, except for a package that his
Master was holding on his hands.
-I have a surprise for you
Said the older one smiling and gave Mob a little sign to follow him to the
massage room. He told him to get on the table and opened the package taking a
metallic case from inside it.
-¿What is that?
Asked Mob curious.
-You’ll see
After opening it he saw that inside of it were a number of dildos of different
sizes. Organized from the smallest to the biggest one, in order of left to
right. They were of a pink color pretty shiny.
Mob turned to see his Master.
-I was all the night investigating in the internet on how to make your hole
“bigger” and they all said that you had to put this inside until it starts
expanding. So I ordered all the sizes that the store had and last night they
arrived to my apartment.
Mob didn’t know what to say. His percentage went up fast.
-I also bought lubricant.
Said Reigen showing him the little purple bottle.
.
.
.
Mob took off his uniform and went to the bathroom with his Master. This one
turned the hot water on and the little room was filled with steam quickly,
covering the mirror and damping the walls. Reigen took of his coat now that the
temperature was getting hotter. He asked Mob to sit in front of him on the
toilet, so he could try to put the dildos inside of him.
Mob was worried. Even tho the dildo was the smallest on the case, this one
didn’t gave him much confidence. Reigen took his knees and smilled calmly. The
heart of the young one squeezed, he didn’t want to hurt him again.
-Relax, ¿All right?
Mob nodded. His Master approached his face to the little member and started
sucking it.
-¡Ahh! ¡ahhhh!
Mob grabbed his hairs, trying to pull him back. Reigen used his tongue to play
with the little member. It was so small that it couldn’t fill his mouth. Mob
respiration was irregular. He had his eyes slightly closed and his head was
spinning around. The clouds of steam could barely give him an idea of where he
was. When he felt a sour flavor run down his throat he decided to keep on going
down until he meet his hole. Reigen took the lubricant and spreaded some on his
fingers, he put a little bit on the hole and started to lick it.
-Haah…! ¡hah…! ¡ahhh…! ¡n-no!
Mob was squirming over the toilet.
With his hands grabbed the seat so he wouldn’t fall. He felt how a fresh
sensation increased with every movement his Master made with his tongue.
-Ma-master… ¡Ahh! ¡haah! ¡ahh!
Reigen achieved to introduce all of his tongue inside him. The lubricant worked
perfectly. He felt all the insides with circular movements, Mob tasted like
blueberry.
The level of excitement inside Mob were about to go over the limits, but
everything stopped when he felt his Master go out of him. He left out a groan
displeased, he didn’t want him to stop. He never felt something like that and
he didn’t want it to end.
Reigen took the dildo and carefully placed it inside of his little student.
-¡Ahhhhh!
Mob clinged to his shoulders, screaming next to his ear. He felt how the object
found its way inside him and reached places his little fingers never had
reached.
-¡Ahhh! ¡ahh! ¡ah!
Reigen was pushing it in and out repeatedly, careful of not hurting Mob.
Meanwhile, Shigeo was fascinated by the sensations that exploded inside of him.
He hugged his Master by the neck and with a strong scream he reached his
orgasm.
-¿How was it?
Reigen asked.
The heart of Shigeo was pounding on his ears. Short spasms made him jump on his
place.
The adult helped him put his uniform back on. He left the dildo inside Mob and
pulled his underwear up to make sure it wouldn’t fell.
-You must leave it there until you expand enough. Then we will put a bigger one
and then a bigger one until im the one that can go inside you.
Mob nodded ashamed. Reigen kissed him and helped him until they reached the
exit door.
The sensation of walking with something on his hole was really uncomfortable
for the young teenager. Even more when he thought it could come out. He decided
to take the bus to reach the school faster. With every step of the stairs he
tightened up his lips and fists. He was able to get on the bus and paid his
ticket. Luckily there was an empty seat near the exit. He placed the backpack
next to him so no one would sit next to him, that way he would avoid the shame
of being found out.
He felt frustrated when he thought that he had to go down the bus and go up the
stairs in the building of the school until he reached his classroom. He never
imagined he would get to hate stairs. In the road the bus went through a street
under construction, which was badly paved and for his bad luck was full of
bumps. Then every time the bus went over one, Shigeo jumped on his seat because
the impacts made the dildo hit his insides. He spent all the way covering his
mouth with his hands, to avoid letting any shameful sounds out of him.
.
.
.
While the days passed and the entrance of Shigeo expanded more little by
little. Mob couldn’t avoid feeling anxious and wish for the day he could
finally make love with his Master.
In his mind there were only perverted thoughts. Every time he was alone in his
home he went to his room and jumped over his pillow pretending it was his
Master, riding him. He even had the crazy idea of sitting over the washing
machine when it was on, so the movements could make him feel wonderful… But
still, after all that nothing satisfied his wishes of feeling Reigen.
And then, finally, the day had come. The biggest dildo went in and out his hole
like butter.
Impatient he called his Master. The adult told him to go to his apartment with
the excuse of attending and exorcism soon and they needed to get ready. His
parents left him go. Mob took the bus to reach the place where his Master
lived. He arrived a few streets away from the place and run until he was in
front of the door.
Reigen was waiting for him and when he saw him on the other side of the
corridor he opened his arms to receive him on an hug. He grabbed him by the
hips and the little esper placed his arms around his neck. They went inside the
apartment.
-Ma-master… please. ¡P-pu it inside already!
He quickly took him to the bedroom and placed him over the bed. Mob whimpered
exasperated.
-Relax, first I have to take a look.
He took of the underwear of his apprentice, pulling the elastic until it fell
on the floor. The dildo came out easily. It seemed that everything had worked.
Now they could do it without any inconvenients.
-Master…
Reigen licked his lips like if he was about to taste an exquisite delicacy. He
got near Mob and this one grabbed his face joining their lips on a desperate
kiss. The impatience of the younger one turned on the older one. His
inexperience exited him enormously and he could only think that he wanted to
hear him scream his name until he didn’t had any more voice.
He separated him briefly so he could accommodate himself better and then he
kissed him again. He kissed him deeply until his tongue reached the throat of
Mob. The kid was grabbing him with strength by his shirt, he didn’t want to get
away from him, even if that meant running out of breath. He felt how his Master
went all over his palate and their salivas fell down his chin. The flavor of
Tabaco was present like always, but he has never tasted it so strongly. He left
out a sign and the older one took the opportunity to get away and breath.
Mob was also gasping for air. That had been a big kiss, but he still wanted
more. He took his shirt off, getting completely naked. His master imitated him
and now both of their bodies were uncovered in front of the other.
Reigen sat on the bed and directed Mob to sit over him.
-¿Are you ready?
Mob nodded repetedly. He hugged him by the shoulders and placed his face on his
neck. Reigen took him by the hips and slowly placed his member over the anal
cavity. The little one closed his eyes and buried his nails on the back of the
older one. His glans had pass through without a problem, but while it keep
going deeper the entrance of Mob shrinked strongly over his member and
threatened with cutting off his dick.
-¡Hahh… you are still too tight! ¡Ahh…!
But he couldn’t go back now. He grabbed him firmly from the hips and pushed him
down hitting him on his G spot and making Mob scream and gasp so much he blew
up the lights of the apartment.
-¡Ahhh! ¿That was good, right?
Mob could only babble unintelligibly, while tears came out of his eyes and run
down Reigens back. How he didn’t got any complain he decided to keep
penetrating him that way.
-¡Ahhh! ¡ahhh! ¡ha…! ¡ahhg!
-¡Hah…! ¡Mob! ¡Ahh! ¡ahh!
It felt glorious… the way Mob fit so will with him, it was perfect, it made him
feel in paradise. Every time he went inside with one of his pushes and the
little psychic let out a weak whimper like the cry of a baby kitten. It was
adorable
-¡Mo… m-more…! ¡M-master!
His wishes were orders. He placed him over the bed again and grabbed him by the
knees. Until this ones were to both sides of his head he realized the
impossible position that they had. He had no idea he was so flexible. Reigen
positioned himself again over his hole and went in hitting him carelessly. He
started to speed up, increasing the rhythm more and more.
-¡Ahh! ¡ahhh! ¡ahhg! ¡haaah! ¡nng!
He moaned without restrictions.
His back started to hurt. All the weight of his Master was over his body, but
he liked being crushed by him. His Master was no comparison to those pieces of
plastic that he had been carrying for weeks. His Master was gigantic, he moved
in a unique way, he was really hot and the hits against his stomach were making
him melt.
-¡Ahhhh! ¡Re-reigen!
He never heard some say his name like that before. He squeezed the clothes of
the bed and put his head back on the pillow.
They were both on their limits, they couldn’t hold a minute longer. The biggest
orgasm of their lives was coming, they had been waiting for it for a while.
Finally… they would be one. They would both fuse.
-¡M-Masteer! ¡Ahhhhh! ¡n-no… ahh…! ¡ahhh!
-¡M-Mob! ¡hah! ¡ahhhhhh!
They came, screaming at unison their names. Shigeo felt the hot sperm of his
Master go inside him, filling him. It burned deliciously. They were covered on
sweat. With the little energy he had left, Reigen leaned by his side.
When he was in front of him he kissed his nose.
-T-this… is just a little part… of what I can make you enjoy.
He told the little one, while fighting to stay awake.
-Mob… I love you
-I-I love you too… Master.
Everything was perfect inside the bedroom they were sharing, but outside this
one, on the streets, it was a total chaos. The whole city had broken in half
and a little volcano threatened with erupting. Various earthquakes had
destroyed most of the buildings and they were still having strong replicas.
None of that mattered for this lovebirds that had no idea of what they had
started. They kissed again for the last time that night and they slept hugging
until the next morning.
End Notes
     Thanks for reading. I really would appreciate some comments <3
Please drop_by_the_archive_and_comment to let the author know if you enjoyed
their work!