Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/680634.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      M/M
  Fandom:
      Sherlock_(TV)
  Relationship:
      Sebastian_Moran/Jim_Moriarty
  Character:
      Sebastian_Moran, Jim_Moriarty
  Additional Tags:
      Teenlock, First_Time, Hogwarts_AU, for_literally_no_reason, Blow_Jobs,
      Hand_Jobs, Awkward_Sex, Somnophilia, sorta_-_Freeform, Dubious_Consent
  Series:
      Part 9 of 30_Day_OTP_Challenge
  Stats:
      Published: 2013-02-12 Words: 2311
****** Immoral and Irresistible ******
by Ambereyedwolfchild
Summary
     Jim is cursed to grow a pair of cat ears and he wants Sebastian to
     fix it. When Jim falls asleep on Sebastian he realises that the ears
     are a lot more sensitive than he expected. Sebastian can't bring
     himself to pass up the perfect opportunity to finally take the chance
     he's always wanted to taste Jim but when Jim wakes up how is he going
     to react?
     Hogwarts AU for no discernable reason. Sebastian is 16 and Jim is 15.
     Day 10 of my 30 Day OTP Challenge: Wearing Animal Ears.
Notes
     Okay, so this kinda got out of control and has very little to do with
     the actual ears. This is also the first proper smut fic I've written
     so it's kinda terrible. Constructive criticism would be appreciated.
See the end of the work for more notes
Day 10: Wearing Animal Ears
A hand shaking his shoulder dragged Sebastian from his sleep, accompanied by a
soft but slightly desperate whisper. “Seb. Seb.” The blonde Slytherin finally
jerked awake and sat up, blinking blearily at Jim. His best friend was leaning
over him, dark eyes wide with fear and confusion. “Help me.”
The expression on Jim’s face was enough to make him sit up and he frowned,
rubbing his face and looking around. The room was dark and Jim had yanked the
curtains around his bed shut, the edges pinned shut with a simple spell.
Sebastian fumbled for his wand, whispering a quiet lumosto light up the room a
little better. “What’s wrong?”
Jim glanced around, as if to check if there was anyone else in the room, before
perching on the edge of the bed. “Irene cursed me again.” Sebastian looked him
up and down immediately, taking in ruffled hair and a too big quidditch jersey
that took the blonde a long moment to recognise as one of his own. Sometimes he
couldn’t believe how fucking cute Jim could be, stood there in a jersey he had
obviously stolen- as Sebastian had no recollection of lending it to him- and
loose pyjama bottoms and he wondered how on earth it had taken him so long to
realise how desperately, patheticallyin love with Jim he was.
After a long moment, the silence growing thicker with each passing second,
Sebastian remembered the whole reason he was awake and looked back up to Jim’s
face. The smaller teen was a little red, fiddling with the hem of the jersey
and obviously remembering that he was wearing the shirt. It was only then, as
Jim ducked his head a little, that Sebastian finally saw what Irene had done.
“Holy shit.”
Poking out from Jim’s mussed hair, and looking incongruously like they belonged
there, were a pair of dark cat ears. They were flicking slightly, pinpointing
and isolating every sound in the room, and were flattened against his head a
little in apparent embarrassment.  The younger Slytherin himself looked down at
his feet then back up to Sebastian, shrugging halfheartedly. “She hit me with a
hex earlier but it didn’t do anything until I fell asleep. And I woke up with
these. You have to help me get rid of them.” There was a blur of motion and Jim
moved from being perched stock still on the edge of the bed to straddling
Sebastian’s chest with a frustrated pout that Sebastian longed to kiss away.
Five and a half years sharing a dorm with him meant that Sebastian was used to
Jim’s complete lack of personal boundaries and didn’t react with more than a
soft grunt as Jim settled on top of him. “I don’t know how to counteract
whatever curse she used.” Sebastian admitted, ever so slightly shifting so Jim
wouldn’t notice his traitorous body’s reactions to being trapped under a warm
body first thing in the morning. He was sixteen for crying out loud, how could
he be expected not to react? “Maybe you should go to Flitwick or the Hospital
Wing.”
Jim pouted, hair falling into his eyes a little, and Sebastian resisted the
urge to cuss- is Jim secretly half succubi because this is fucking unfair at
three in the morning.  “I don’t like going to the hospital wing, ‘Bastian.”
That was true. Jim was a nightmare when it came to trying to make him go to see
Madam Pomfrey, nine times out of ten he would rather hide in his covers and
wait for it to go away. The older teen sighed, giving Jim an appeasing look.
“How about tomorrow morning I come with you to the Hospital Wing?”
“You’ll stay the whole time?” Jim said quietly, tone measured and wary.
“The whole time.” It wouldn’t be a hard promise to keep. Sebastian could be
very stubborn when he needed to be and Jim was the only reason that he ever
needed to be. Not to mention that Madam Pomfrey knew by now that if she threw
out Sebastian it wouldn’t take long for Jim to disappear.
Jim watched him for a second, weighing the truth in his words, before grinning-
apparently content with the deal- and rolling gracefully to one side, still
sprawled across Sebastian like a human blanket. “Good.” He wriggled closer,
wrapping his arms around the older boy and tucking his face into Sebastian’s
neck, curling as close as was humanly possible. “Night, Sebby.”
To say Sebastian was surprised by the sudden change in position would be an
understatement; to say he mindedwould be a bald faced lie. Once Jim was settled
down he curled one arm around Jim’s waist, the other coming up to
absentmindedly card through soft dark hair. The Irishman made contented noise,
pressing closer and curling his hand into a fist around the faded material of
Sebastian’s pyjamas. “Night, Jimmy.”
He would never cease to be amazed at Jim’s ability to fall asleep in half a
second, Sebastian decided as Jim’s breathing evened out and he slowly relaxed
until he was melting against Sebastian, sleep warm and pliable. He didn’t stop
stroking Jim’s hair, twisting strands around his fingertips and accidentally
tugging a little every now and then. Jim still didn’t stir and Sebastian’s
curiosity got the better of him. He let his hand wander up a little higher,
just brushing the base of Jim’s new appendages.
They were soft and warm and a lot more solid than they looked. As Sebastian’s
fingertips skated up the sloping backs, they twitched and flickered, making a
visible shiver run down Jim’s spine. The younger boy squirmed closer to
Sebastian and away from the exploring hand but still didn’t wake. He traced the
base of the ears next, dragging his nails gently across the spot where they
seamlessly met Jim’s head. He wasn’t expecting the reaction he got.
A high and broken whine escaped Jim, head tipping back and nails digging into
Sebastian’s back, but he was somehow stillasleep. His breathing had sped up,
warm air rushing across Sebastian’s pulse point and making goosebumps stand up
on his skin. The sound shot down Sebastian’s spine, making him groan as heat
pooled in the pit of his stomach.
Jim shifted slightly, a quiet moan being dragged from his lips as the movement
made Sebastian’s fingers drag past the sensitive new appendages. The sound
snapped Sebastian out of the lust hazed daze he’d been in, hurriedly untangling
his fingers from Jim’s hair. This was wrong. Jim was going to wake up and kill
him.
It seemed that the sleeping teen wasn’t happy with the loss of contact as he
made a mumbling sound of complaint, rolling his hips against Sebastian’s thigh
in fast uneven thrusts to compensate. The blonde froze, not entirely sure what
he was supposed to do when he could feel the heat of Jim’s cock pressed to his
leg and soft whines in his ear. He knew what he wantedto do… “Seb.”It was the
breathy moan that shattered his self control and kicked him into motion.
Carefully, oh so carefully, Sebastian rolled Jim onto his back and moved so he
was leaning above him. “Jim. Wake up.” He kept his voice hushed, not wanting to
wake the three other teens sleeping in the dorm. Jim stirred, not quite awake
but not nearly as comatose as he had been. “Wake up Jimmy.” Sebastian couldn’t
help punctuating the statement with an open mouthed kiss to Jim’s jaw.
No reaction. The taste of Jim’s skin was intoxicating and Sebastian couldn’t
resist sliding a little lower. His hands slid under the jersey Jim was wearing,
palms skating across warm skin. He took a moment to admire the faded ‘MORAN’
spanning the younger teen’s chest before pushing it impatiently out of his way.
Flawless pale skin was revealed inch by agonising inch and Sebastian pressed a
trail of kisses across his stomach and flicked his tongue across one pink
nipple experimentally. Jim huffed weakly but the reaction wasn’t satisfying
enough so Sebastian traced his way back down to his hips. The blonde bit down
gently on his best friend’s hip, leaving a small red mark that he longed to
darken into a bruise. Before he had a chance to make a decision Jim’s hips
juttered upwards and Sebastian knew that if he wanted to taste Jim- and by God
did he want to- he had to hurry up.
Sebastian looped his fingers under the low riding waistband of the sweatpants
Jim was wearing, slowly tugging them down and ignoring the little voice telling
him to quit while he was ahead and stop.It was shockingly easy to get the
material out of the way, revealing more of that beautifully pale skin and Jim’s
half hard cock. Sebastian’s breath ghosted across Jim’s thigh as he dragged his
fingertips down Jim’s length, circling the head gently and feeling the younger
man hardening in his hand.
A low moan made his eyes flick up to Jim’s face and he knew that he didn’t have
much time before he woke up. The idea of getting this close and not getting to
finally, finally, taste Jim was much worse than the idea of Jim waking up- and
he knew his priorities were skewed- and it pushed Sebastian to cross that last
line. He fisted Jim loosely with one hand, running his tongue slowly up the
underside of Jim’s cock to taste the drop of precome beading at the tip.
Apparently that was the last straw as Jim arched off the bed with a loud broken
moan.
Sebastian looked up, hand still slowly moving as he watched the younger teen
struggle to find his bearings. Dark eyes widened as he looked down at Sebastian
tracing circles into his thigh with his free hand. Sebastian’s voice was low
and gravelly, eyes darkened with lust but still tinted with nervous concern.
“Tell me to stop.”
The words took an embarrassingly long time to register and Jim yelped, hips
rolling involuntarily into the far too slow movements of Sebastian’s hand.
“Don’t stop!” It was a mewl more than a moan, the Irishman’s hands curling into
fists in the covers. “Please…”
A wide smirk grew on Sebastian’s face; there would be time to gloat over the
fact that Jim wantedhim to do this later. He wrapped his lips around Jim’s
cock, trying to relax his throat and taking Jim as far as he could. It was
harder than he imagined and he had to keep his fist curled around the base that
he couldn’t quite reach but by the way that Jim’s hips were shuddering under
the pressure of not bucking up he must be doing something right. “Seb!” His
name sounded perfect being dragged from Jim’s lips and Sebastian sped up as
much as he could, moaning as Jim tugged on his hair hard. “Sebsebseb… going to-
fuck!” That was all he managed to gasp out before he was coming, arching off
the bed and biting his lip hard to supress a moan.
Despite having not expected it, Sebastian swallowed slowly, a little of Jim’s
come beading on the corner of his mouth. It took Jim a long minute to recover,
eyes slowly fluttering open again as he sat up and stared at his best friend.
Sebastian did, at least, have the grace to look embarrassed but that particular
expression was quickly wiped away as the smaller Slytherin leaned down to steal
a cautious kiss, tasting himself on Sebastian’s lips.
Jim wasn’t quite expecting how eagerly Sebastian kissed back, hand running
through soft blonde hair as he warily let his hand dance down to Sebastian's
boxers. He slipped his hand under the older teen’s waistband, pulling away with
an incongruously bashful expression. The cat ears were flicking erratically in
his mass of ruffled hair, flattening against his skull and betraying his
nervousness as Jim wrapped his hand around Sebastian’s cock, moving slowly as
he tried to get used to the awkward angle before he sped up, taking Sebastian’s
breathy moan as encouragement.
It was clumsy and embarrassingly fast, not taking very long before the uneven
strokes pushed Sebastian over the edge, making him come without warning over
Jim’s hand and the thin material of his boxers with a low moan of the other’s
name. Jim flushed as he curiously licked some of the pearly liquid from his
fingertips, drawing an involuntary moan from Sebastian.
“God, you’re gorgeous.” It didn’t seem like the blonde was even aware he was
speaking as he surged forward for another kiss, a lot more tender than their
first. Jim curled his hand in Sebastian’s hair to pull him closer, accidentally
smearing come across the covers as he used his other hand for balance. The
first thing he noticed was that Sebastian’s lips were chapped, catching roughly
against the smooth skin of his own and making the kiss a little messier than he
imagined it would be. The second was that Sebastian tasted exactly like he
smelt, like peppermint and a little like the air on a crisp winter day. It was
a long few minutes before Sebastian pulled away, biting gently on Jim’s bottom
lip.
Jim didn’t get a chance to speak as Sebastian carefully helped him pull his
sweatpants and pulled the younger man against his chest, curling around him
protectively. “Shhh, Jimmy. We can talk in the morning, ‘kay?” He was too
exhausted to argue so Jim nodded contentedly, nuzzling into Sebastian’s throat
with a worn out yawn and ignoring the quickly drying come coating both their
bellies.
It wasn’t the way that he had imagined their first time, but Jim couldn’t bring
himself to care as Sebastian’s breath slowed and he tangled himself around Jim
like he never wanted to let go.
End Notes
     If you have any prompts or fic requests then send me a message on
     here or on kinkysmutdragon.tumblr.com and I'll add it to my to do
     list. Constructive criticism would be adored as I am very wary about
     posting this.
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