Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/1101316.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      M/M
  Fandom:
      Supernatural
  Relationship:
      Castiel/Dean_Winchester
  Character:
      Castiel, Dean_Winchester
  Additional Tags:
      major_underage, Incest, Parent/Child_Incest, Dad!Dean, Daddy_Kink, Alpha/
      Beta/Omega_Dynamics, Alpha!Dean, omega!cas, Destiel_-_established
      relationship, Underage_Sex, PWP, shota!cas
  Series:
      Part 3 of Good_for_daddy
  Stats:
      Published: 2013-12-25 Words: 1256
****** Flexible omegas are the best ******
by orphan_account
Summary
     Please read the tags.
     Cas is 12 here and Dean is his father. Extreme underage and
     established parent/child incest relationship
     If you dislike these topics, please turn away right now! Those of you
     who do find it enjoyable please read on
      
     PWP, no plot whatsoever, not ever a smudge, just alpha!Dean showing
     his omega boy some love and testing his flexibility a little.
Dean knew that if anybody else found out what they were up to behind closed
doors, he could get arrested, it was still very much frowned upon for an alpha
father to mate and claim his omega son, but he found it hard to care about that
at times like this, when he was buried balls deep inside his twelve year old
boy, pounding his brains out. And Cas, with his little body and high pitched
moans, hooded blue eyes and perfect white skin, writhing desperately under his
father, his little hole drenched with slick so sweet it made Dean dizzy, while
his boy kept pushing onto his cock like it was the only thing he ever wanted in
life… well… Cas made it really difficult to care about anything else but
fucking each other into oblivion
Cas cuming was truly a thing of beauty, the little omega going limp and pliant
under him so Dean could just keep fucking without any care, deep inside the
boy’s hole until he came, his body clenching around his dad’s knot furiously…
it was all so wonderful that it made Dean think the small body was created
purposely for him to fuck and breed it, to keep his cock warm on cold winter
days and to hold onto his cum like it was something precious.
Besides the vice grip around his cock, Dean noticed his son suddenly stopped
responding to his attack on the boy’s little prostate and Dean realized that
Cas blacked out for a couple of moments, it didn’t happen often but sometimes
Cas came so hard he lost conscience, and it always drove the alpha wolf inside
Dean feral to know he brought his baby boy so much pleasure that the little
body couldn’t handle it and closed down. Even now, while helping his son
through his heat, the boy still couldn’t handle the strength of the orgasms his
alpha gifted him with.
He increased his speed diving deeper and deeper as he saw the outline of his
knot bumping into the little boy’s stomach, oh god… could the little creature
under him be any more beautiful? He just never got tired of the sight,
sometimes he even patted the bump, or he kept his hand on his son’s stomach and
used the hand as target practice, trying to hit it bulls eye with his cock from
the inside… it was all kinds of awesome and hot and it always made the omega
drown his dad’s cock in fresh slick..
Cas stirred a little, coming back to the land of the living, with his favorite
way of waking up – his daddy’s knot splitting him open… and taking in the way
his body was positioned, his tiny prick hardened instantly. Apparently, while
he was out, Dean shifted him and he found his face being pushed into a pillow,
arms folded and trapped under him, legs bent at the knees and spread so wide he
didn’t know would be possible, framing his dad’s hips like a wheelbarrow, perky
ass up in the air and so full of scorching hot cock it was surreal…
The position wasn’t very comfortable but it made no difference to the boy, he
enjoyed it immensely when his daddy treated him like his very own little bitch
to be fucked and bred, abusing his pussy like it was made only for taking his
father’s knot, his cum, and the connection between them was just as amazing and
perfect as ever.
Cas preferred being fucked and used like this by his daddy to when Dean made
love to him slowly and carefully treating him like a princess, like he was
something fragile and breakable.
When he was like this, Cas could feel how crazy he made Dean, how desperate and
needy for his little body his dad always was, it made the boy feel so wanted,
desired, loved, cared for … even if his back kind of hurt right then… in the
end, feeling and seeing Dean like this above him was worth it, was always worth
the finger shaped bruises on his ass and legs (which the boy secretly enjoyed
to no end as he plunged his little fingers in his tiny hole when he stared in
the bathroom mirror at the proofs of his daddy’s passionate love making), it
was worth the sore ass he would have for the following days (undoubtedly
clenching from time to time around the crystal clear plug he received from his
father a couple of days before when he opened his christmas presents, that is
after he finished unwrapping many pairs of thigh highs, see through panties,
silk stockings, a light green summer dress, a pair of tiny black fishnets, some
ruffled bikini, the little cream toned lace bra he saw in a store a couple of
weeks ago… his daddy just loved him so much!)
When Dean shoved himself so deep into his son’s body that Castiel could
practically feel his baby teeth clashing, the boy knew his daddy was close, so
he tightened his passage, trying to milk his father’s knot to it’s best. Cas
might have had a puny body even for his age, he might have been lithe and slim,
but the muscles inside his ass could almost beat the shit out of Dean’s orgasm,
at least those were Dean’s thoughts when he moaned deep and low and spilled his
seed into his son, connecting them together for at least half an hour.
Dean adored the fact that his son’s body was so small and flexible, it was so
easy for him to shift the light boy any way he wanted him, to position him
according to mood, available space… the possibilities were limitless. He
especially enjoyed seeing his flexible little baby all stretched out, stuffed
at both ends, the boy’s favorite vibrator in his ass, his father’s cock in the
omega’s mouth and Cas just couldn’t get enough…. Dean sighed, he was indeed a
very lucky man to have such an obedient and cock hungry little omega to call
his own.  He was already planning when they will take the next shower, to hold
the boy by his slim legs, upside down parallel to his body, the boy’s head
positioned in front of his cock so he could fuck that tiny warm wet mouth maybe
even knot it while he eats the boy’s ass, licking and sucking all the cum and
slick deposited there.
His spent dick began to perk up at the visual image, releasing yet another
round of cum into the boy underneath him…. god he loved his son and he just
couldn’t get enough of him. Sure, he was mating with Cas almost frequently for
two years now, since the boy first presented as an omega, and Dean felt like he
was addicted to the feeling of being inside his baby boy, whatever they did
together, or whenever they did each other, Dean just couldn’t get enough until
he filled his son with four or five rounds of his cum. After that he just loved
to plug his baby, cradle him in his arms while he stared lovingly at the little
thing, and just pat the boy’s inflated stomach while he listened to his cum
sloshing on the inside and imagined how Cas would look carrying his father’s
pups                                                                           
                                                                        
For now he was satisfied with just sitting there, his precious baby boy held
tight in his arms, skinny back plastered to his chest, Cas’s even breathing
lulling them both to sleep.
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