Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/5235698.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      M/M
  Fandom:
      Supernatural
  Relationship:
      Castiel/Dean_Winchester
  Additional Tags:
      Extremely_Underage, Alpha/Beta/Omega_Dynamics, Alternate_Universe,
      Parent/Child_Incest, Male_Lactation, Omega_Dean, Alpha_Castiel, Top_Dean,
      Child_Abuse, Kink_Meme
  Collections:
      Anonymous, Supernatural_Kink_Meme
  Stats:
      Published: 2015-11-18 Words: 1850
****** Bedtime ******
by Anonymous
Summary
     Dean's nightly nursing sessions with his son get a little out of
     hand. Kink meme fill.
Notes
     Prompt: http://spnkink-meme.livejournal.com/
     104506.html?thread=39553338#t39553338
     Omega Dean should've stopped breastfeeding his 7-year-old son Castiel
     a long time ago. Instead it has become a nightly ritual, bath,
     bedtime story, breastfeeding and lullaby. It's weird but it's
     comforting, or it was until one day the little hands gripping him and
     his son's mouth suckling on him caused tremors of arousal. He should
     stop, tell his son he's a big boy now like he should've done years
     ago. Then his little innocent boy starts squirming around trying to
     get comfortable on Dean's clothed erection and that thought starts to
     die out. This leads to Castiel getting fucked by his omega daddy
     while he keeps breastfeeding.
The only part of Dean's day he looks forward to is actually at night. Bedtime
for his sweet little boy: Shower, story, singing, and his final feeding.
Castiel is taken away more and more now that he's at school, training for his
future as an alpha leader. Dean's own mate doesn't believe in lingering
sentimental omega influence. In fact he's made noises that Dean should have
been knocked up again long ago, but since Dean has already provided an heir, he
doesn't question why Dean hasn't gone back into heat in eight long years. And
since his mate also doesn't believe putting his own son to bed is an alpha duty
either, it's Dean's short time each day to shower his boy with love and
affection.
Freshly scrubbed, even in the bathroom Cas lifts up Dean's shirt searching for
the nipple. It's their longstanding secret, and Dean's surprised that Castiel
hasn't blurted out about it at an inopportune time. Nowadays it's considered
inappropriate to nurse past much beyond two, but here's tall skinny Cas,
begging for suckling at age seven. Dean hardly produces any milk anymore, but
with long effort Cas does get something. Right at this moment he's dripping wet
on the floor, though, so best to wait until he's tucked into bed.
Dean dries off his little boy and wraps him in fuzzy robe to go up to his
bedroom. Throughout the hot summer he's been letting Cas sleep naked, but now
that it's fall he wants more bundling, and sometimes falls asleep wrapped up
swaddled like a newborn. Once upstairs Dean dims the light and closes the door,
just in case. His alpha mate is down in the basement glued to the television,
so there's not much danger, but it gives Dean the illusion of privacy. Just him
and Cas, and no one else in the world.
Tonight Cas can't even wait for a story. “Please, daddy?” he asks, and tugs on
the shirt again.
“Didn't you get enough dinner, kid?” Dean asks. Cas doesn't answer, but just
stares up at him with those luminous blue eyes, asking for something although
he can't articulate why he wants it. Dean's already giving in, and lifts the
shirt up above his small breasts. “Under the covers, though, okay big boy?” he
tells him, and Cas nods.
They lie down together under the warm coverlet, on their sides facing each
other. Cas scoots down so his face is at chest level, and Dean rests the
blanket over him in a loose warm tent, so anyone barging in wouldn't
immediately see what they're doing. With long years of practice, Cas opens his
mouth and pulls the whole aureole into his mouth, his tongue automatically
flattening out to give it a good hard suck. Some nights he actually bruises
Dean's nipples, he sucks so hard at the first latch, but it's necessary to get
the small amount of milk to let down so Dean doesn't harshly correct him.
Instead he wraps his hand in his little one's hair, and pulls his head away
slightly.
“Not so hard, it'll come, baby. Promise.”
Cas whines a tiny bit, but softens his mouth. Just like that, Dean feels the
let down, and the accompanying rush of hormones that relaxes his whole body.
Relaxes both of them, because now that Cas has the sweet liquid in his mouth,
he melts against Dean's chest, and gives a contented sigh. It's almost like a
drug, the good feeling that washes over the two of them at their special time.
Tonight Cas is extra squirmy, like he cannot get comfortable even with his
Daddy's enticing breast in his mouth. He shifts back and forth, and his free
hand roams over Dean's chest with soft fluttering touches that almost tickle.
The hand comes to a stop on Dean's other nipple, but then he's pulling on it,
twisting it in time to his deep stimulating sucks on the other side.
Dean's breath can't help but catch. Almost against his will, his cock starts to
stir, and presses underneath the elastic band of the sweatpants he's wearing.
Cas's wriggling doesn't help; he's got a leg practically nestled in between
Dean's that keeps rubbing in the most inappropriate places. Cas shifts again,
and the leg presses upwards straight underneath Dean's small straining cock and
stretched perineum, and this time Dean doesn't resist, but presses back and
rocks against him.
There's no harm in it, he thinks. Like all decent omegas Dean is used to coming
untouched, from the knot alone, so a little unrequited frustration is nothing
new. He never touches himself, for Dean is faithful to his mate's standing
orders. But sometimes, deep down, Dean has dirty thoughts. He wants to turn the
tables and fuck someone else for a change. He wants to feel his own cock slid
into a tight wet pussy or ass, and come from friction and lubrication and
prying someone open, and nothing at all inside him for once.
At that moment, Cas's robe falls open. Dean can feel his little baby erection
grinding against his leg, only a thin layer of cloth between them. His bare
chest is cradled against Dean's sweaty skin, and his son's skin is so soft and
inviting that Dean shifts two inches just so they're sharing maximum surface
area. Cas stretches the nipple when he repositions his own cock in protest, but
then decides he likes the new position with all that warm slightly damp skin
between them. And that's when the thought occurs.
It won't hurt him, Dean's sure. As an omega, his cock's hardly the size of two
fingers, and he knows – intimately – how much even a small ass can take. Plus
he knows he can always pull back if Cas shows even the slightest moan of
discomfort. As a test he languidly runs one hand down Cas's smooth back to his
hips, then moves around front to rub his tiny cocklet. Two fingertips, grazing
the sensitive band near the tip that someday will swell up into Cas's first
knot. He strokes just that spot and watches his little boy's reaction. Cas
looks up at him in surprise but doesn't relinquish sucking on his tit.
“Everything will feel good, okay?” Dean murmurs. “We'll both feel good, I
promise. Just keep nursing.”
Cas nods, and Dean gently prods him to switch sides. In the process he rolls
over on his back and slides Cas all the way on top of him. His cock's right at
the boy's stomach, but by encouraging him to sit up a bit, Dean thinks he can
make the angles work. First, though, he wedges a hand in between them, past
Cas's wide-stretched straddling hips. He pushes in the tip of his finger into
Cas's perfect pink hole, no lube or anything, just to get his baby used to the
idea. Again Cas rolls his wide eyes up to stare at him, and this time lets go
of the milky nipple, to Dean's disappointment.
“Daddy, that...”
“Shhh, it'll be all right. Do you trust me, honey?”
“Yea...ah?”
“It's something grown-ups do, and it feels amazing. Do you like this?” Dean
pulls his hand forward to fondle Cas's cock, this time with slow strokes up and
down the shaft. The whole member fits comfortably between his thumb and palm,
so all it takes is a little roll to get Cas breathing hard.
“Yeah,” Cas says, more sure now. He instinctively rocks into Dean's hand and
against his leg, so much like a mini-rutting alpha looking to fuck that Dean
almost chuckles. But Dean's got another activity in mind.
“Okay, well, this will make us both feel like that. But you got to promise to
be quiet like a big boy, and go back to nursing. Can you do that?”
Cas doesn't respond, except to latch on with renewed vigor. There's the hormone
rush again, and every suction of Cas's tongue brings another surge of pleasure
straight down to Dean's dick. He's desperate to be in him now, and speed it up.
Dean brings Cas's hand up to his spent side and murmurs at him to twist it,
hard, over and over.
He inserts two fingers into his mouth for what little lube he can get, and
without any other prep worms both of them in from the back. Cas's back arches,
but he doesn't let go, or cry out, or wriggle too much in discomfort. His
little boy trusts him, and Dean doesn't push it too far, going more for getting
him used to the width than any kind of deep exploration. Dean's amazed how
relaxed and limber he is, how Cas lets him touch him in all his private parts
without fear or tensing up. And when he pulls Cas's butt up to straddle his
hips and begins to inch his cock in, Cas's only response is to suck even
harder. Dean's going to be bruised and sore by tomorrow, but he doesn't care;
the combination of yanking on his nipples and that tight ass all around his
cock is heavenly.
Dean shoves up into Cas with short beats. Not too deep at first, but it doesn't
take long to bottom out. Cas's legs are stretched outwards to take him all the
way in, and flattened as much as he can hip-to-hip, so his own little cock is
squeezed between them. Dean uses one free hand to get ahold of it again, and
the other on Cas's silky back, massaging him in reassuring circles while
pinning him in place.
“That's it baby, soooo good. Doesn't hurt at all, does it? Now we're going to
move, and you'll feel better than you've ever felt before.”
He picks up the pace, and Cas keeps up, rutting into his hand. Dean tries to
drag it out, make the wonderful sensation last as long as possible, but the
tight channel proves to be too much to hold back. It only takes a few strokes
deep into Cas's tiny body before he's coming, harder than Dean can remember in
years. He clamps down on Cas's cock at the same time, making a ring around the
knot band, and Cas moans into his breast and shudders through his own orgasm.
His first, Dean's sure, and a wave of love and shaky adrenaline pours out of
him over his precious little boy. He lets go of the cock and wraps his long
arms all around his small frame, rocking and holding him close, and nuzzling
the top of his head.
“Feel as good as I said?” he whispers, after they both calm down.
“Good, Daddy,” Cas tells him back, his voice muffled a bit from laying on
Dean's chest. “Can we do it again?”
Dean strokes Cas's lengthy back, the robe long gone. He's still half inside his
son, and Cas's mouth is resting right next to the puffy nipple, almost like a
kiss. Dean's never felt this close to anyone in his life. Not his mother, not
his brother, not his own mate.
“Tomorrow night, baby. At our secret special time.”
 
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