Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/2727689.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      M/M
  Fandom:
      Supernatural
  Relationship:
      Dean_Winchester/Sam_Winchester, Dean_Winchester_&_Sam_Winchester
  Additional Tags:
      Top_Dean, Bottom_Sam, Sam_is_12, Dean_is_16, Anal_Fingering, Hand_Jobs,
      Dirty_Talk, Underage_-_Freeform, Incest, Sibling_Incest, Dean_is_a_bad
      big_brother, Frottage, First_Time, Weecest
  Series:
      Part 6 of Tumblr_Prompts
  Stats:
      Published: 2014-12-06 Words: 2115
****** Fuck You, Julian ******
by MissKatherine
Summary
     little Sammy hearing about probing in school and asking Dean about it
     so Dean demonstrate.
It's just a phase, but Sam doesn't know that. He thinks that his little twelve
year old brain is capable of making a life decision and go through with it for
the rest of his life. And this time, his decision is to be a space monitor.
He's still not sure if it's a real job but what he knows for sure is that
Aliens exist. And if Aliens exist then he'll be the one to catch them. So he
spends his study hall talking with Julian, the thirteen year old boy who did a
science project on Aliens, Sam's not sure how that's possible but it only
proves that Julian knows what he's doing. So he sits and listens to Julian
ramble on and on about Aliens and abductions and planets that don't exist in
this galaxy. Sam's enjoying it though, because he needs to learn everything he
can about Aliens if he wants to catch one.
And then Julian, gets into a more interesting subject, at least he thinks so.
Being thirteen pushes him into making his mind a sex filled dungeon and the
need to share it with ignorant boys is overwhelming. So he opens his mouth and
says "Probing." Like it's so normal, like it's so awesome and needs to be
shared with innocent little Sammy.
And it's just Sam's luck that the bell rings and he doesn't get to ask "What
the hell is probing?" Instead he goes home, walks because it's close and Dean
doesn't have the Impala to drive him.
He does his homework with only one word in mind. Because he's obsessing and
because he thinks it's just another cool, futuristic, advanced tech that the
Aliens use. He glances at Dean. He's sure Dean knows. Dean always knows,
everything about everything. But Dean is also a jerk sometimes and likes to
tease Sam. So Sam needs to consider this, weigh how much he wants the new
information versus how much is he willing to put up with dean.
It's a short battle because he closes his books and heads to the couch. He has
that determined look in his eyes that he thinks makes him look serious but in
truth it just makes him ten times cuter. He sits down next to Dean and waits
for Dean to notice him.
"Already finished?" Dean asks with sceptic look.
Sam ignores the question and turns around so he's facing Dean with his entire
body on the couch. "What's Alien probing?"
"What?" Dean is taken off guard that he feels like he just got a slap to the
face. He mutes the TV and turns to Sam. Trying his best to look calm and
collected and not completely freaking out by the fact that his baby brother
just asked about Alien probing. "Where did you hear that?"
"Julian told me about it—"
Dean cuts in before Sam can finish his sentence "Julian? That older kid I told
you not to hang out with?" Dean is more than a little pissed.
Sam wants to talk back, to defend Julian but he's a little confused of why is
Dean getting angry over his question. "But he knows a lot about Aliens—"
"What's it matter? They don't exist!" Dean stands up and walks away "Don't hang
out with him again." He parks the order as he leaves the house.
"Jerk." Sam flops back against the couch and stares at the ceiling.
It's a little over two hours later that Dean comes back, he's not angry anymore
because his eyes are soft when he searches the room for Sam. He walks towards
the couch where his brother is still sitting and joins him. "Hey Sammy?"
"What?" Sam shoots back, still frowning and pouting with those lips.
"I'm sorry I got so mad before." Dean waits for Sam to look at him but he
doesn't.
"And?" He finally turns to look at Dean.
"And what? That's all." Dean answers and relaxes back on the couch.
"What about Julian?" Sam asks with a puppy dog look that God can't say no to.
"Stay away from him. I don't want you hanging out with older kids." His voice
is commanding and final. No sixteen year old should sound so authoritative but
he learned from the best.
"But I hang with you all the time." Sam whines.
"That's different babe, I'm your brother." He has that smirk an that look that
radiates confidence and he's giving it to Sam.
Sam can't help but blush at the pet name. He turns to Dean again "Will you tell
me what probing means now?"
Dean's smirk disappears and he clears his throat "Well, it's kinda like...it's
when—ah, fuck..." He runs his hand over his face and sees Sam staring at him,
eyes wide and a tiny smile tugging at his lips, he looks as existed as an elf
on Christmas, and God those rosy cheeks that match his lips. Dean just wants to
grab him and kiss him until Sam's lips are all red an shiny and swollen and it
feels good just to think about it.
"Sammy?"
"Yeah."
"Want me to show you?" He swallows because Jesus Fuck he did not just say that
to his baby brother.
Sam only nods.
"C'mere." Dean's hands are acting without any thought, he grabs Sam's waist and
turns him around so he's laying on his stomach with his ass in the air. Dean is
doing his best to understand exactly what he's doing but then he sees Sam's
ass, and notices how Sam doesn't even try to struggle. He just lies there and
waits for Dean to do whatever. And that makes him fucking hard. That submission
that comes to naturally to Sam because "It's Dean." And that's all the reason
Sam needs.
"You trust me, Sammy?" He just has to ask, because hearing Sam say it will
probably crash any self control he ever had.
Sam nods without looking back at Dean.
It's enough for Dean so he looms over Sam's body, doing his best not to rub his
cock against Sammy's ass. His hands reach Sam's pants and he slowly starts to
undo them, he keeps his eyes on Sam who glances back at him for a second before
relaxing again. When he realizes Sam's comfortable with this. He pulls his
pants down and Sam lifts his legs to get them off. Dean's breath comes short
when he sees the two globes covered in boxer shorts.
Fuck, he looks good enough to eat. Dean gives himself a mental slap and sits on
the couch, his face leveled with Sam's ass "Jesus." He breathes and slowly
pulls Sam's boxers, waiting for Sam to freak out or push him off. But Sam just
tenses a little and looks over his shoulder to try and meet Dean's eyes but
fails.
Sam's boxer shorts pool around his knees, and Dean thinks that maybe his cock
is about to burst. He gives himself a squeeze to adjust and licks his lips. His
fingers brush against Sam's flesh and slowly he places his entire palm on each
cheek. He gives a small squeeze because Mother of God, he's going to cum and
Sam makes a small sound that's a moan and a whimper so Dean just squeeze
tighter.
"Fuck, Sammy, you like that?" He's not really excepting an answer. Just wants
to run his mouth so he doesn't lose his mind. He pulls Sam's cheeks apart and
finds the small pink bud, and Dean's ready to bet his life that it tastes as
sweet as it looks. He takes a breath before running his thump over it and feels
Sam shiver.
"You ok Sammy?" Fuck, is that his voice?
Sam nods again and it's followed by another whimper.
"Just relax, promise it'll be good." He presses his thump just to feel Sam open
up under his touch and pulls back. He brings his middle finger to his mouth and
sucks on it. Keeping his eyes to that pink entrance. And he can't help but
imagine how his cock would feel inside. And that reminds him to undo his own
pants and let his cock rest in his boxers. He rubs the wet finger against Sam's
hole and Sam yelps with an audible moan.
"Open up Sammy, let me in." He pushes his finger before waiting for Sam to
relax and it just fucking goes in. Like Sam's ass just welcoming him, loving
the attention and begging for more. He keeps pushing until his finger is all
the way in and a really dirty and loud moan comes from Sam.
"Such a little slut, Sammy. Like having my finger inside you baby brother?"
Sam nods "Dean!"
"Fuckin' takin' it so good." His finger fucks in and out of Sam's hole like
it's his cock and he watches Sam push his ass back, silently asking for more.
"Think you can take another one, huh? Can you open up for big brother?" If
Sam's really that tight around just one finger, Dean doesn't want to imagine
how his cock would fit. He'll stretch that little hole so wide, rip it open and
Sammy will probably love it. He pulls his finger out and Sam whines and brings
his hand back to keep Dean in.
"No, Dean, put it back in." He whines each word and pushes his ass up even
high. "Please."
Dean was about to lick another finger to put it in but hearing Sam beg like
that made him bring his hand to his cock and jerk it slowly. "Tell me what you,
little brother."
"More, want more, put your finger inside again." Sam doesn't even notice how
hard he is because he never realized how good it feels to have his hole
stretched open. "Feel so empty, rub my insides again, please big brother."
"Gonna fill you up so good, don't worry baby boy. Gonna open your little hole
'til you can't take it." He gets out of his pants and boxers, giving his cock
few more jerks before gathering all the precome and bringing it to Sam's hole.
He doesn't warn before putting two fingers at the same time. And when he gets
to hear Sam sweet innocent voice moan his name, he holds his cock at the base
to stop himself from cumming.
"Yeah, Sammy, take it, take your big brother's fingers. Think you can cum just
like that? Getting fucked with my fingers?" His fingers are getting faster,
feeling Sam clench around him every time he pulls out. He looks at his cock,
all red at the tip and leaking, just for Sammy's ass. He buries his fingers
deep and gets dizzy when Sam moans "Yes!" Followed by a whimper.
"Gonna let me fuck you, Sammy?" He's aware that twelve year old Sam can't
decide that for himself, and twelve year old Sam with two fingers up his ass
defiantly can't decide that.
"Please."
"Is that a yes?" Dean asks without moving his fingers.
"Move...pleeeease!" He looks over his shoulder at Dean with a red face and
swollen lips. He looks so debauched, and no twelve yearold should look like
that but it just turns Dean on even more is possible.
"Just let me fuck you, gonna stretch that little hole so good. C'mon Sammy."
He's aware that he's begging but he's willing to do Sam's homework for a week
if it means he gets to be inside that ass.
"But, we're brothers—" Sam's protest turns into a whine when Dean twists his
fingers and hits Sam's sweet spot.
Dean can't hold his load any longer so he pulls his fingers out and places his
cock between Sam's ass cheeks. The groan of relief that escapes him is followed
by another whine from Sam. Dean brings his hand around and wraps it around
Sam's small cock. He matches his thrusts with his hand movements and before he
can start a rhythm, he's shooting two seconds after Sam. He can feel Sam's
orgasm through his body and he gives few more weak thrusts as he brings his
hand to his mouth and taste Sam. He glances at his own cum on Sam's ass before
Sam turns around and pulls his own shirt to wipe it.
"Fuck, Sam, you always taste this good?" He watches Sam lay on his back and
pulls his boxers up. He finally gets to see his face and he wants to kiss him
until he cums again.
But Sam smiles at him and pulls him down, making Dean cover his body completely
and crashes their lips. "You can fuck me next time." He states with a small
smirk.
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