
Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/2616917.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      M/M
  Fandom:
      Supernatural
  Relationship:
      Castiel/Dean_Winchester
  Character:
      Castiel, Dean_Winchester
  Additional Tags:
      Alternate_Universe_-_Brothers, Little_Brother_Dean, Big_Brother_Castiel,
      Power_Bottom_Castiel, Top_Dean, Riding, Multiple_Orgasms, Coming_In
      Pants, First_Time, Rebel_Dean, Alternate_Universe_-_High_School
  Stats:
      Published: 2014-11-14 Words: 1510
****** Little Brother ******
by Invictusimpala
Summary
     “Think we could fit in shower sex before mom and dad get home?”
     “I’m ‘game’ if you are,” Castiel says, and Dean huffs a laugh.
Notes
     Based on a prompt I received on my tumblr. Thank you so much for
     reading, enjoy :)
See the end of the work for more notes
The Novak-Winchester family is extremely religious. Castiel’s parents lug him
and Dean to mass every Sunday morning, the earliest mass possible -- eight
thirty in the morning.
It’s confessing their sins whenever they can, dressing their best, doing well
at the private school they’re both currently attending.
If only their parents knew what went on behind doors.
Castiel gets good grades, studies, applies for college. Dean’s only a year
younger, but it makes all the difference. He’s constantly out, and Castiel has
to cover for him most nights while he goes and parties, dancing and drinking
with boys and girls alike.
When he starts trying to get Cas to come with him instead of having his nose in
a book, he both has to cover for and avoid his brother.
It’s not his thing, he tells Dean, and it really isn’t. He’d rather pass his
math test than drink beer illegally.
Dean leaves eventually when a car horn honks outside the house. Their parents
are out for the weekend, and for that Castiel is thankful. He can read, write,
do as he pleases without having to worry about them pressing curfew, asking
where his little brother is.
Dean arrives at around two in the morning with a slam of the front door and a
creak of bed springs as he passes out, most likely drunk out of his mind.
Castiel falls to sleep, and when he wakes it’s to Dean in his arms.
“Dean?” He asks, shoving at his brother’s shoulders. “What are you doing in
here?”
“It’s cold, thought I’d come and join you,” he grumbles, and snuggles in closer
to Castiel’s bare chest.
Castiel worms his way out of bed, pulling the fabric of his boxers down lower
so he’s not showing anything. Dean stares sleepily up at him.
“What’re you doing?” He slurs, and Castiel rolls his eyes.
“Are you hungover? Do you need water or Advil?” Castiel asks, and he shakes his
head, yawning.
“No, I didn’t drink at all, I never do.”
“Yeah, right.”
“I’m serious. The only thing I ever do is have a good time, and I don’t need to
get drunk or grind on people to do it.”
“I thought that’s all you did in your free time. What are you actually doing?”
“Eh, hanging out with the guys. Mostly we just want to look like we are rebels.
I’ve . . . never had sex or whatever, if that’s what you’re asking about, Mr.
Protective Big Brother.” Dean says quietly, a nice flush making his skin turn a
pretty shade of pink that makes Castiel lick his lips.
Dean watches the movement, and pulls the sheets up higher on himself, up to his
shoulders.
Inappropriate, Castiel thinks, are what his actions are, and now he’s gone and
made Dean uncomfortable.
“Come back to bed,” Dean says, and Castiel hesitates for only a moment before
he’s back under the duvet, warmth of it comforting, and that sleepy feeling
starts to fog his brain back up.
Dean immediately curls into his side, and Castiel is surprised to find him hard
against his thigh.
“Dean, I should --”
“Please,” Dean whispers against his skin, and Castiel sighs. He should be up
out of bed and tending to his day's work, as should Dean be, but he’s being
very convincing as he ruts his hips down against the muscle of Cas’ leg.
Dean whines, pants into the crook of Castiel’s neck as he grinds his hips,
rolling them in little circles over and over.
“Wait, wait,” Dean says, and kisses Castiel on the mouth.
“Dean, I need you,” Castiel mumbles between slides of lips. Dean breath
hitches, and he whimpers. Castiel feels Dean’s come through the fabric of his
boxers, and he has to hold himself back from making a mess in his own.
“Do you have lube?” Dean asks slowly, and Castiel fishes around in the bedside
drawer until he finds some. Dean laughs. “Where’d you get this?”
“I like using it on myself.” Dean growls, pins Castiel under him, but he’s not
having that.
Castiel fights Dean until he’s the one on top, and Dean looks shocked. Castiel
grins and leans down to kiss Dean roughly on the lips once or twice.
Dean whimpers, thrusting his hips up, but Castiel holds him down harder,
grabbing the lube from his hand to prep himself.
This feels wrong, dirty, like nothing he’s ever done before, and he can’t
fucking wait to get Dean inside him.
He pulls his boxers down enough that he can reach behind himself. Dean pulls
himself out of the slit in his own boxer-briefs, and Castiel moans. Dean’s
huge, long and thick, veins along his shaft throbbing as he starts to leisurely
jack himself off.
Cas' fingers are slicked up, and then there are two against his hole. He
presses them in with little resistance, and Dean leans around to watch.
He moans when his fingers brush his prostate, and normally this is when he’d
come, but he holds himself back with a hand around the base of his cock. Dean
stays obediently until Castiel is able to touch him again.
“Dean, need you in me now,” he pants, but he’s still being held down and he
can’t do anything except for thrust his hips up unsuccessfully.
Castiel’s fingers are removed with an unhappy sigh, and then he’s sinking down
onto Dean’s cock with hitched breaths as he does.
It’s bigger than anything he’s ever taken considering the only thing he’s ever
used is his fingers, and it burns in a way he wasn’t expecting.
Dean is a writhing mess under him, panting and making pathetic noises that
Castiel is copying because it feels so good. He didn’t expect for this to feel
so good.
Castiel’s moan is cut off as Dean thrusts up, and he shoves his hands down into
the mattress harder, a signal meaning stop, and Dean does.
Castiel gives an experimental rock of his hips, and he keens. Dean’s big, and
he can’t quite take all of him yet, but Castiel hopes there are future
opportunities where he can learn to.
Dean squirms in his hold, whimpering and moaning. Castiel hopes there’s no one
home and that they aren’t being loud enough for the neighbors to hear.
Castiel picks himself up from Dean’s lap, letting his wrists go, and Dean
immediately reaches out for Castiel, hands not forcing him anywhere, but gently
guiding him so it's good, perfect.
Castiel slams his hips back down onto Dean, pulling the rest of him in until
Castiel can feel every bit of him in places he didn't know existed.
Dean’s mouth is agape, and Castiel dives in to kiss him, licking into his mouth
and sucking on his tongue.
Castiel does it again and again, riding Dean like he’s done it a million times
before.
“I’ve been waiting for this, big brother,” Dean gasps, and it makes pleasure
zing down Castiel’s spine, adding to the already pooling warmth in his gut
that’s about to explode.
“Dean, Dean, what -- I -- oh god,” Castiel cries, and he knows it’s a sin, he
shouldn’t be taking the Lord’s name in vain, but he can’t stop, doesn’t want
to.
“Cas, Cas, come on, come for God’s sake,” Dean groans, throwing his head back
as Castiel bounces faster in his lap.
Castiel’s cock jerks as he orgasms, shooting between Dean’s pecs, and he holds
onto Dean’s shoulders for leverage as his mind goes blank, heart beat only a
ringing in his ears.
He can distantly feel Dean filling him up, and he bears down with all of his
strength to milk his little brother through it.
The room is getting louder and louder as Dean shouts his release, Castiel being
just as loud if not louder.
When they finally start to come down, breathing hard, chests heaving, Castiel
rolls off of Dean to the other side of his bed. They both sprawl for a few
moments before coming back together, curling into each other’s sides.
Dean hums happily, breathing in the smell of Cas. Castiel leans into his heavy
petting, pulling his little brother in closer.
“Dean, are you okay?”
“Yeah,” he croaks. “Are you?”
“Yes, I am. Was . . . that okay?”
“Hell yeah. Were you okay with that?”
“I’d like to do it more, if that’s alright with you?” Castiel can feel the grin
Dean’s trying to hide against the sweaty skin of his shoulder. “We need a
shower.”
“Think we could fit in shower sex before mom and dad get home?”
“I’m ‘game’ if you are,” Castiel says, and Dean huffs a laugh.
“Absolutely. I’ve wanted to suck you off for years.” Castiel kisses him
roughly, rolling over so he’s on top of Dean, held above him by the strength of
his elbows that’s quickly crumbling.
“Shower,” Castiel growls, and then they’re up and running to the shower. They
don’t make it, and Castiel ends up getting fucked against the wall with a stain
to explain to their parents.
He’s already thinking up excuses, Dean asleep on his chest.
End Notes
     My_Tumblr
     I am taking prompts there, if you're interested :)
     (More info on that here)
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