
Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/2041737.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      M/M
  Fandom:
      Supernatural
  Relationship:
      Castiel/Dean_Winchester
  Character:
      Castiel_(Supernatural), Dean_Winchester, Charlie_Bardbury_(mentioned)
  Additional Tags:
      teacher!Cas, Student!Dean, Top!Cas, bottom!Dean, Dom!Cas, Sub!Dean,
      Underaged!Dean, Dom/sub, Bondage_and_Discipline, Bondage, Cock_Rings,
      Vibrator, Anal_Sex, Anal_Fingering, Handcuffs, Orgasm_Delay/Denial, PWP
      without_Porn, PWP, Porn_Without_Plot, Plot_What_Plot, Shameless_Smut,
      Smut, Fluff, AU_-_alternate_universe, Spanking, Math_Kink, Math_(sorry),
      Dirty_Talk, Castiel_Talks_Dirty
  Series:
      Part 2 of Math_is_Fundamental
  Stats:
      Published: 2014-07-29 Words: 2327
****** A Lesson In Cheating ******
by Just_Breezy
Summary
     Dean's been a bit naughty and that has landed him in his teacher's
     (sex) bed, laying on his stomach cuffed to the bedposts. Mr. Novak
     can be caring just as stern, but he can never be anything but a
     teacher; and naughty boys need to be taught a lesson.
Notes
     I'm not sure how I feel about this one... I kind of don't like either
     of the fics, but again, smut is smut. Enjoy, let me know what I can
     improve upon and as always: Sorry!
     Also, you don't really need to read the first part to enjoy this :)
    Dean didn't exactly do it on purpose, really. It's just so hard to look at
the nerdy little math teacher with glasses that constantly slide off his nose
and his dynamic enthusiasm about calculus and not wonder where all that raw
carnal dominance is, and if he can get that part out of him during class.
Exhibitionist kink aside, Dean also can't help but want to please Mr. Novak
every time he sees him, wants to feel his swift punishment and gratifying
praise for everything Dean can do. It would be a lie to say Dean hates being
punished, but he also has a yearning to please.

    And for that, Dean is laying naked on his teacher's bed set aside solely
for sex, cuffed to the bed posts from his wrists and ankles being whipped by
Mr. Novak's one and only belt. Dean can tell Castiel isn't using his complete
strength; he wants to discipline the petulant boy, but not enough for him to
safe word out.
    "Tell me, boy, what have you done wrong?" Another provokingly light slap to
his ass. "Do you mean today or since our last rodeo?" Dean wanted Castiel more
angry, more aggressive. He needed the older man to lose control, like the first
time they did this. Three more whips, just as gentle to his lower back and ass.
"Don't test me, Mr. Winchester, you've already broken enough rules today
alone." More hits becoming slightly more indignant, leaving Dean exhaling
relief.
    "Well, today I raised my hand in class and called you 'sir' in front of the
whole room, then when I went up to the board, I brushed my hand against your
hard on, which was likely from me calling you 'sir' without anyone knowing what
it really means, or from me bending over to grab the chalk and then -" Dean's
guileful words got lost in a combination of a moan and hiss from pain as
Castiel let the belt down especially hard. Finally, there's the Mr. Novak only
Dean's allowed to see. "Are you intentionally aggravating me, boy?" Castiel's
words grumbled in his chest as he walked around the bed, dragging the leather
of the belt along the outline of Dean's form. Dean knew he was about to get his
way. "I was not aware I  was dealing with a brat," a much firmer slap followed,
"I'm going to have to use, alternative measures." Dean's never indulged this
part of his persona to this degree- always the pleaser; but sometimes breaking
the rules (on purpose) is a reprieve. The boy shivered with excitement as the
older man fondled the welts on his exquisite ass, reverently tracing the rise
and fall of abused skin.
    Castiel dropped the belt beside Dean's hip, keeping it within grabbing
range. "So, Mr. Winchester wants to play like this; does Mr. Winchester also
want the cock ring?" His teacher smiled wickedly, spinning words of nefarious
delights. "No sir! Please, sir, no cock ring!" Dean pulled on his restraints,
moving his head side to side, looking for his teacher. "That, is not for you to
decide, slut. You've been so naughty, and if my bad boy wants to play this way,
he must live with the consequences." Without the belt, Castiel allowed his
hands to roam over Dean as if he was simply furniture, a part of the room,
sometimes being handled too roughly.
    With every caress over the swell of the boy's ass, Castiel would raise his
hand to strike, causing his student to shiver in anticipation, but instead suck
a possessive mark onto the boy's ass. The student would jerk at the surprise
every time, but relax into the act as soon as the older man pulled away and
continued his ministrations with his hands. Castiel smirked into a blossoming
mark and bit the inflamed area softly. The last time Dean was made to wear the
cock ring was for masturbating in math class; it wasn't a fun experience, but
Dean needed to be punished and Castiel was keeping him in a constant state of
denial: he was and wasn't being scolded. The mind games were driving him mad,
and all the older man would do is continue to suck and bite marks across the
boy's flesh, no longer spanking his pettish student.
    Dean squirmed, unable to direct the warm heat of Castiel's mouth anywhere,
or reciprocate the touches. Once the teacher was done branding the boy with his
mouth, he moved his mouth further down the slit of Dean's ass, licking a trail
to the boy's perineum while his agile fingers worked over the tight ring of
muscles, never digging in. Gently grazing his teeth over the sensitive area
behind the boy's balls, Castiel began biting with increasing vigor,
relentlessly pressing his prostate. "You young, petulant, spoiled brat, you can
never make up your mind if you want to break all the rules, or if you want to
worship them." Dean moaned in foggy confusion from the pleasure while the older
man assailed his prostate.
    Stepping away from the boy, Castiel grinned at the wreck he'd created; Dean
writhed from the loss of contact, wantonly pleading for satisfaction,
forgiveness. The older man reached under the (sex) bed for his chest of
treasures and pulled out an oval vibrator primarily marketed to women and the
infamous cock ring.
    "Ok brat, here is your punishment: I'm going to put the cock ring on and
use your beautiful ass, if you can answer the question you got wrong on the
quiz before I come, I'll let come too. Understand?" Castiel is a devilish
bastard, and it only makes the sex better. Dean nodded before asking for
permission to speak, "how am I supposed to answer a calculus question without
at least a pencil and paper, sir?" The baleful grin on his teacher's face only
grew. "You are my brilliant little whore, I'm sure you will figure something
out. If not, it's no different to me, I'm still going to come in your ass."
    Castiel reached down under his student to secure the cock ring, fingers
playing with the purpling cock as he withdrew his hand. Dean puled at the
glorious and brief contact. Next came the pink oval vibrator placed on the
boy's perineum, "close your thighs and keep this in place. If I find that it's
moved, there will be no masturbating for a week." Mr. Novak was a hard dom, but
that made pleasing him so much more worthwhile. The vibrator shook against the
poor boy's over-sensitive balls and tirelessly stimulated his prostate from the
outside. Dean had been achingly hard since class, being tormented all the way
thereafter for his indiscretions, the constant stimulation made the tight coil
of heat pool under his navel, yet no relief came. The boy groaned in near
agony, cursing and begging.
    His teacher's smile never faltered as he rubbed copious amounts of lube on
his fingers and began working the boy open. "Oh pet, look at how your greedy
hole swallows my fingers, as if that will bring you any relief. Just a
reminder, pet, the question you got wrong was: 'air is being pumped into a
spherical balloon at the rate of 7 cubic centimeters per second. What is the
rate of change of the radius at the instant the volume is 36π? The volume of a
sphere of radius r is 4π/3 r3" Dean mewled, pushing back as much as he could
against his restraints without also losing the vibrator between his legs.
    As Castiel's fingers opened up the pliant boy, Dean tried to get his mind
to remember how related rates worked; if he didn't come, he very well may die,
and for that, he can't think og anything about math that wouldn't generally
give him a hard on.
    The older man scissored him open, not delving deeper than needed, saving
that for his cock to do. His teacher could see the gears shifting in the
younger boy's head, trying to figure it out. Castiel openly loved math and
found it very sensual in it's own way, but nothing was more sexy than Dean
trying to work out a problem; the furrowed brow and curling lashes as his
evergreen eyes saw imaginary numbers and letters, his plump lips pursing,
occasionally being moistened by a delicate pink tongue while his mind worked
through numbers. Nothing was more beautiful.
    Dean's teacher began slicking up his own leaking dick, getting ready to
mercilessly fuck into the younger boy. The pain in Dean's lower body throbbed
and diluted his mind with nonsensical torment; he was his teacher's toy being
wound up.
    Castiel laid on top of the younger boy, lithe body pressing against muscle
under a mutual filament of sweat, Castiel's legs wrapping around Dean's, lining
up to bottom out. In one smooth thrust, the teacher was balls deep, reveling in
the combination of tightness and reverberate from the vibrator. Before the
older man began his truculent pace, Dean remembered his fellow student, Charlie
Bradbury mentioning how she answered the question while comparing marks at the
beginning of class.
    Screaming the answer in a mix of pain and pleasure, Castiel sighed and
muttered something about 'no fun' as he slid his hand under Dean to remove the
cock ring.

"How?"
"What do you mean 'how'? Just undo the ring, please, sir!"
"Answer me, boy."
"Charlie told me at the beginning of today's class, sir!"
"Mhm, cheating, and much like real quizzes, you get the passing mark, however
you miss something vital: the lesson. For that, the ring comes off, but I will
evade your orgasm until I finish."

    Mr. Novak's benevolent voice and I'm-The-Biggest-Assbutt-Ever voice are
identical, Dean can contend to that right now. He often uses both in class.
Dean let out a sigh of anguish, "please sir." Castiel leaned down and kissed
behind the boy's ear and began fucking into him quickly and hard, never missing
his prostate with his fist tight around the base of the student's cock,
effectively replacing the cock ring. The angle was awkward with one hand under
the boy, but this did nothing to stop Castiel from using his student's ass for
his own pleasure. The tight coil of heat in Dean's belly only grew with every
rough drag of Mr. Novak's cock stretching him from the inside-out.
    Castiel leaned down to the body under him again and whispered, "does my
naughty boy still like to break the rules?" For the third in ten minutes, Dean
felt what should have been an orgasm just constrict within himself, cock
throbbing in his teacher's hand. The boy was nearing tears when he felt his
teacher's rhythm begin to become erratic, nearing his own orgasm, and the boy
knew he could hold out just a little longer, prove he could take anything and
everything for his teacher.
    At last, Castiel groaned long and deep. Dean felt his ass fill and the hand
around his dick let go. His teacher bit into his shoulder and fucked gentler
through their orgasms; Dean was busy screaming, releasing what felt like the
biggest load ever all over Castiel's black satin sheets and himself, feeling
nirvana for finally being granted relief. The pleasure was beyond anything he
had ever felt. The boy laid in his own wet spot while the thin body above him
pulled out, minding the over-worked hole, and pulled the oval vibrator off and
set it away.
    Dean was panting and falling asleep when Castiel unlocked the cuffs and sat
down on the double bed, petting his sated student. After allowing Dean a few
minutes peace, Castiel picked up the boy and carried him like a child: Dean's
arms and legs dangling behind his teacher, head snug against his neck, mumbling
things that sounded like 'manly man' and 'don't need to be carried', though too
tired to put any animus into the words, leaving Castiel to roll his eyes as he
walked with his student in his arms back to the room he uses explicitly for
sleep.
    The older man dropped Dean on the soft duvet and began cleaning him up, the
boy allowing Castiel to handle him. Once he was clean, Castiel pulled him under
the duvet and pressed the boy's back to his chest.

"Was that too much, Dean?" Castiel asked meekly.
"No man, I was loving it."
"I'm glad... Dean, what are we doing?"

    Dean turned in the bed to face his teacher. They've been sleeping together
for only a little over two weeks, sharing kisses when they can, but mostly it
was spent in Castiel's sex-room. They never spoke of what they were doing in
terms of their relationship- generally, the conversation was about sex or other
more commonly friendly topics: what Castiel was cooking Dean, TV shows, books
and the likes. Dean smiled and kissed the older man, pressing their bodies
together.
    "We're doing whatever we want," Castiel stared reverently at the boy; he
was thirty and Dean was seventeen, soon to be graduating, starting his life.
Where would his high school math teacher fit in there? "I just... Dean, what is
this? Am I just an outlet?" Both men hid their pained shock at the words, Dean
snaked a between Castiel's. Though they did enjoy fucking, Dean loved to just
stop by Castiel's place to hang out, sex or not. Dean wanted more with Castiel,
but had no clue how to say it, how to explain he wanted to make everything
work, no matter the obstacle.

"Of course not, Cas! You're... you're mine, and I'm your's... and I don't want
to be anyone else's..."
    Dean shied away while Castiel searched his face for any clues of calumny,
but found none. Relaxing into the cuddle again, Castiel pulled Dean in closer,
resting his head on top of the boy's before kissing his forehead and saying,
"you've been mine since the beginning, and I guess that does make me your's."
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