Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/4559562.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      M/M
  Fandom:
      Supernatural
  Relationship:
      Castiel/Dean_Winchester
  Character:
      Dean_Winchester, Castiel, Zachariah_(mentioned)
  Additional Tags:
      Alternate_Universe, AU, School, Student/Teacher, Student!Dean,
      teacher!Cas, BDSM, Dom/sub, Dom!Cas, Sub!Dean, Underaged!Dean, Blow_Jobs,
      Public_Blow_Jobs, Math_Kink, Butt_Plugs, PWP, Plot_What_Plot, Porn
      Without_Plot, Smut, Shameless_Smut, AU_-_alternate_universe, High_School
      AU, PWP_without_Porn
  Series:
      Part 4 of Math_is_Fundamental
  Stats:
      Published: 2015-08-13 Words: 2017
****** Not The School Pudding ******
by Just_Breezy
Summary
     Castiel brought this on himself, really.. Well, some of it... Well,
     not really- ok, ok, Dean just loves to push his buttons.
Notes
     I feel as though I haven't utilized one of the great privileges of
     having a *series* of BDSM porn: being able to build a D/
     s relationship with all psychological aspects without losing the porn
     or adding a plot; keeping this in mind, this is more of a set up to
     one that has more psychological punishment and submission than it
     does physical (but yes there will be!)
     Anyways, I have some plans for about 3 fics after this and I'm
     thinking of doing a Math Is Fundamental: Drabbles with just some
     shorter scenes of play, so hopefully I'll be updating this soon.
     *Will not mention personal thoughts on work*
     As usual, you can read this as a one shot or as a part of the series.
     Enjoy~
10:43am    
    'You infuriating little cocksucking brat', Castiel thought with true
malice. Class had only begun twenty minutes ago, and Dean was amping up his
antics quickly. While most students were writing diligently, taking notes and
trying to memorize all the could before the test (Castiel was nice enough to
give them one final review session before the unit tests), Mr. Winchester on
the other hand, felt this would be the ideal time to play How Much Innuendo Can
I Get Away With Before Principal Shirley Gets Involved. This was the last class
before lunch, and as it happened, Castiel's prep was after lunch. His brat was
sure to get his fill for lunch, and certainly not on cafeteria pudding.
    "Mr. Winchester, I'd like for you to stay during lunch to discuss this
behaviour", an audible ooh rang through the classroom, even at seventeen they
couldn't resist the scandalous affair of being pulled aside from class. Dean
gave a lopsided grin and wink with another comment making Castiel all too aware
of how tight his pants were. It was always the seemingly innocent phrases that
held the most meaning for the two, and made them that much more dangerous. Damn
him.
    The test began and the room became silent. Castiel sat at his desk checking
emails and facebook, his eyes occasionally betraying him and seeking a certain
green-eyed demon. The sound of pencils, calculators and regret began to fill
the air, giving Dean the opportunity to continue his fun. It's really not his
fault, or even his original plan for class today; Castiel has already gotten an
email from principal Shirley informing him that students were beginning to
talk, and he did need to do well on this test, but... Cas knows he can't
control himself when he wears the tight black button down and thin red tie, he
brought this on himself.
    Dean could see his teacher's eyes searching for him from behind his glasses
and computer screen. He knew the older man was rock hard and fighting not to
touch himself during class. The boy knew that resolve was easily broken with
the right pressure, preferably on his nipples, just innocent enough not to draw
the attention of others, just slutty enough to make Mr. Novak unbearably hot.
The teen began 'absentmindedly' rubbing his chest, slowly becoming more focused
on his sensitive nipples until they were as hard as he was and very obvious to
anyone looking for it. Lunch today was going to be delicious.
 
12:04pm    
    "You impudent little slut, you know what happens when you play this game!"
Castiel growled as Dean sat at his desk, tough-guy facade still in place.
Finally, as the sounds of students began to filter towards the cafeteria did
Dean begin to shift to Castiel's little submissive, gasconade replaced with
innocent guilt, "master, I can't help myself, you just- ", before Dean could
finish, Cas stood up, glaring threateningly at the boy as he does when he is
being disobedient, signifying the beginning of dungeon rules, dominant persona
taking over. Obediently, Dean shut his mouth, waiting for instruction; Castiel
sat back down, satisfied with his pet's submission. Leaning back and allowing
his lithe legs to fall open, Castiel evenly spoke velvety commands, "now, it's
time to clean up your mess, beginning with this," gesturing to hard line
adorning the front of his tight pants, similar to the growing bulge in Dean's.
    Looking quizzically at his master, Cas sighed and waved his hand, "speak".
"How would you like me to clean this up, sir?", the words a delicate plea to
let the play really begin, 'always the impatient one' Castiel thought, watching
his little sub squirm with (mostly) controlled anticipation. "You will clean
your master up by first putting on a show. Make it slow", the teacher spoke
with twisted excitement; no matter how many times Dean stripped, it would
always be a whole new experience. The boy bit his plush lip, looking more
anxious than excited, which was unusual for him, features no longer lit with
desire. He began to shift in his seat, Castiel could only imagine it being the
plug he was meant to wear, fuelling his hunger, to watch his young student peel
away the layers of 'real life's' exterior only to reveal his exquisite boy's
nimble docility, a fervid need satisfied only by Castiel himself and the piece
of plastic pressed inside him. "Well? Do I need to tell you twice, slut? You're
already in trouble, young man", Dean turned his emerald green eyes to his
master pleadingly, soft features making him look younger, more ethereal, "don't
waste my time, Dean, what is it?" "Well..." Dean hesitated, after a beat
Castiel clued in, "come here right now, slut". The student shyly walked to his
teacher, watching the floor as he passed through the rows of desks towards the
mahogany one at the front, letting some cleverly places corners and objects
'relieve' some of the pressure at the front of his pants. Finally reaching the
older man, the boy squeezed his eyes shut as Castiel forcefully grabbed his
hips with one hand and reached into his pants, unceremoniously handling Dean's
aching cock before turning him around and giving his ass the same treatment.
After firmly pressing the tight ring of muscles only to find it completely
empty, the older man let out a disappointed tsk; looking over at Dean, he saw a
soft pink begin to climb up his neck from under the collar of his dark green
tee, Dean turned to meet his teacher's eyes, "such a bad little student, if you
act like a brat, you shall be treated like a brat". The boy shuddered at both
sides of the prospect, unconsciously leaning into Castiel, seeking his hand's
firm grip, "but we don't have enough time for that, since a certain brat
wouldn't listen to their master. For now, you can suck my cock, but I can't
pass up this time as your teacher to ensure you understand the unit, as you
seemed... preoccupied before and during the test." The words pulled Dean out of
his reverie, suddenly realizing the time and the doom of his own near future
and dissatisfaction.
    The student groaned and pouted while reverentially getting on his knees
before his teacher, happy to be getting anything at all. Castiel would never
tire of seeing Dean's divine lips hungrily pursed. As he raised his hands to
undo the older man's fly, Cas swatted his hands away, growling "no, only good
boys get that privilege". Dean looked up, batting his deep viridian eyes,
receiving only Castiel's unflinching stern stare, then leaned towards the worn
metal zipper, never breaking eye contact.
    With a satisfying zip, his teacher's cock extruded towards his mouth,
unrestrained, 'that asshole is commando and he calls me a slut?''. Finally
looking at his prize, the boy began by gently kissing the sensitive head; Cas
let out a quiet breathy sound while Dean began enveloping his dick in the
lascivious heat of his slick mouth. "Consider the ladder question, the ladder
is 15 feet tall, it begins 10 feet away from the wall and is being pushed
towards it at a rate of 1/4 ft/second. How fast is the top of the ladder moving
after 12 seconds?" Related rates weren't easy without a visual, but Mr. Novak
had been thorough when he went over them- the final exam would lack an equation
sheet, so there wasn't any room for slacking, and Dean was brilliant, but it
would be a test to see how brilliant. The words barely came out more than a
groan as the boy moved his tongue over and under the head before swallowing all
of it in one swill, relishing in the delicious feeling of having so much of his
master inside him, even if it wasn't where he wanted to be filled. Dean knew
exactly how his teacher liked to be licked, working his tongue from tip to end,
pausing to suck the thick vein, feeling his teacher begin to melt, hand in the
sandy short hair, breathing enticingly erratic and heady. "Answer the question,
pet, you're not getting out of this," Dean grumbled and pushed his nose into
the coarse hairs, nearly choking on the thick cock in his mouth with his
teacher beginning to thrust into the teen's throat, "if you don't answer before
I come, you'll be put in the cock ring for 3 days" Castiel brayed, seemingly
taken aback by his own body's actions. The boy moaned in protest, the sound
reverberating through his master as he picked up the pace, recklessly shoving
his throbbing cock as far as it could reach, civility be damned.
    Feeling his teacher in his mouth throbbing and leaking into his throat
reminded him of the heavy and neglected dick between his own legs, desperately
wanting to touch and be touched, he clasped his hands together behind his back
like a good sub. Dean fought to concentrate on the question, 'ok, 15 foot
ladder... going where? Up? Down? Oh, fuck, fucking hell, uh- 'Cas let out a
carnal sound beginning in his chest, sending chills down the boy's spine,
making the math harder- nearly as hard as the boy himself. His entire lower
body throbbed and ached, but he still made no movement to alleviate it, not
without permission, especially not to come without permission, and he needed to
prove to his master that he was a good submissive, no orgasm could match
knowing he made pleased his master.
    Castiel watched as the student worked on both concentrating on pleasing his
master's body and answer the question. His eyes followed the conflicted
features dance, one second taken aback by the excitement of being played with
and focusing on the problem, though both had their merit for The Most Beautiful
Expression Ever. Damn him. His cheeks hollowed as his eyes screwed shut, traces
of a smile graced his face as his tongue moved in ways that could only come
from a lot of experience.
    Just as Dean felt his teacher nearing his climax, he tried to get "0.13"
out around the crown of Castiel's cock, the feeling and right answer sent the
older man over the edge, pulling out of the teen's mouth, he got most of the
come on Dean's face, surprising the boy. He quickly began to catch what he
could with his mouth, relishing in the obscene gesture, licking what he could
off his face and then moving on to licking off Castiel's cock. Once they were
(mostly) clean, Dean nosed the sensitive areas around his master's dick and
hips, leaving trails of kisses as he went.
    "You have about 15 minutes before classes start. If you hurry home and
return with your plug in, we can have some real fun after school." The words
were gently whispered as Cas stroked Dean's hair, not even he could feel any
malice towards this amazing boy. Dean hummed in content as Cas scooped him up
and nuzzled under his chin, nosing the rough scruff, "you did well today, but
the rules are not to be broken, do you understand? Only punishment waits for
bad boys." The student smiled as the older man affectionately tickled his neck
with kissed, "you assume I don't look forward to being punished". Castiel
laughed, turning his gaze to the ring Dean got him, "you're certainly not
getting much else lately". They sat together in the after glow a bit longer
before Dean jumped out of Castiel's lap, "if I want some real fun, I need my
plug, eh? Well, looks like I'm heading home." Castiel fixed his pants before
standing up with Dean, "well, Mr. Winchester, I expect to see you after class"
before giving the boy a soft kiss and muttering, "and don't skip English.
Zachariah won't shut up about the low attendance in his class." The teen gave
him his signature lopsided grin, bravado back in place, "I solemnly swear that
I won't attend his class" and walked out the door.
'What a cheeky little nerd'. 
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