Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/236643.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      F/M
  Fandom:
      Yosuga_no_Sora
  Relationship:
      Sora/Haruka
  Character:
      Kasugano_Sora, Kasugano_Haruka
  Additional Tags:
      Twincest, possession/marking, Barebacking, Sleepy_Sex, Biting, Power
      Dynamics
  Stats:
      Published: 2011-08-08 Words: 2673
****** Haruka no Sora ******
by FallacyFallacy
Summary
     Sora is entirely in Haruka's power, and she will maintain that
     position whether Haruka wants it or not. Written for Kink_Bingo for
     the square Possession/Marking.
Notes
     This is set mid-way through episode 11, when they were fucking but
     Haruka hadn't become completely freaked out by Sora's weirdness yet,
     and no-one else knows about them.
Haruka turned absently, shifting into a more comfortable position. As he moved,
something brushed against him, and a quiet sigh could be heard. The sensations
anchored him and consciousness slowly returned.
Yes – he was lying in bed, and from the shade of light beyond his eyelids and
the sound of birds behind his window it was morning. The blanket wound
uselessly in a tangled mess over his stomach – he only continued to use it,
really, because he couldn't get to sleep without one no matter how hot it was.
Yes, that was normal. But -
His eyes fluttered open, falling on the sight of his twin sister sleeping
peacefully beside him. Her long grey hair was fanned around her, falling over
her pearly-white shoulders. Her eyelashes were dark where they rested against
her smooth cheeks, her lips full and pastel pink. She was hugging her toy doll
to her naked chest, fingers locked around it protectively. As always, she
looked like some sort of beautiful doll – fragile and innocent, pure as snow.
Emotion flowed through him. Yes – this, too, was normal, now. To be so close to
her, now, and to see this beauty so near to him, to not only be able to take
care of her, but to touch her...
With mild surprise he was too sleepy to encourage, he realised that her
eyelashes were flickering. A tiny pale hand reached upwards to rub at her eyes,
which soon opened to him – the precise same dark grey colour of his own.
“Haru...” she murmured, voice husky with sleep but as beautiful as ever. As he
watched, her lips twitched, widening into a small but truly genuine smile.
“Sora,” he replied, smiling in turn, expression identical. Ever since they had
moved here he had been so worried – Sora had seemed so unhappy, so bored, so
frustrated... Being able to take care of her and make her happy like this was
so wonderful!
With a giggle, Sora shuffled forward, kissing his lips lightly. Haruka let his
eyes flutter closed and returned the kiss, enjoying the feel of Sora's bare
legs against his own. The toy squashed between their chests and Sora broke
away, moving it out of the way. Haru chuckled, and Sora grinned at him. A
moment later she had latched onto his shoulders and pulled him over her,
kissing him more deeply.
As he kissed her, running his hands through that perfectly if now slightly
messy hair there was a little voice in the back of his head reminding him, as
always, of what he was doing. This was his sister – he shouldn't be kissing
her, or touching her like this, or wanting to do anything like that. But that
voice had been speaking up so much lately, and he was tired and happy and had
his arms full with a beautiful, adorable girl who was madly in love with him,
so just for a few moments, he decided not to care.
Propping himself up with one arm, he let his other drift down to her shoulders,
pressing into the soft skin of her arm. She murmured and he flinched away –
pain? He always forgot how sensitive her skin was. Of course, that sensitivity
could be more pleasurable elsewhere...
Deciding that that was a very good idea, Haruka traced his fingers downwards,
cupping his hand around her cute breast. Her skin was so warm...! She sighed
into the kiss, pulling him closer. He considered curling his fingers around the
curve of her breast and deliberately avoiding her nipple, but gave in after
only a moment's thought. He had never been good at teasing on purpose,
especially not towards Sora.
She gasped as his fingertip touched the pink bud, her nipples hardening
quickly. Slowly, he rubbed his thumb against the side, allowing her to get used
to the feeling. Soon she was squirming beneath him, her lower half pressing
distractingly into his crotch. Still he rolled the nipple between his fingers,
tongue lapping against hers.
The mouth disappeared; Sora had turned her head away. Her pale cheeks were
flushed, her lashes falling over her half-lidded eyes. “Haru~,” she protested,
pouting. “So slow!”
Haruka blinked, then chuckled. “Sorry!” He pecked her lips apologetically, then
shuffled further down on the futon so he could kiss against her collarbone, the
middle of the chest, and then -
“Ah!” Sora's back arched, her thighs clamping shut as Haruka took her nipple
into his mouth, swirling it with his tongue. He was still pretty new to this –
other than Nao, Sora was his first – but he had had a good deal of practice
lately and was getting used to working out exactly what Sora enjoyed. He sucked
lightly, then hard, and Sora groaned louder, hands curling around the back of
his hand, fingers tangling in his hair.
But Haru wasn't done there, and after a moment he let go of the nipple, to
Sora's whimper of frustration. Instead he kissed across her small, cute tummy,
eventually reaching her cunt.
It was so strange seeing it up close like this. When they were kids they had
seen each other naked so many times, and then even when they were older odd
glimpses of skin were inevitable. But even when they were young they weren't
supposed to look – not like this, with his face practically touching it. Each
time he did it he felt a shiver of achievement for a desire he had never known
he had. Or never wanted to admit, at any rate.
“Stop looking,” Sora complained, but with amusement in her voice. “It's
embarrassing...”
“Sorry!” Haruka said again, breathing warm air onto her engorged clit; Sora
jumped. “I can't help it...”
Sora giggled, and Haruka allowed himself one final thing – he pressed his mouth
on one side to her folds and sniffed. He wasn't sure why he enjoyed this so
much, but this other sensory reminder of exactly what they were doing quickened
his heartbeat ever further. Leaning on one arm, he brought the other hand to
the top of her thigh, rolling her hips back to he could access her pussy better
and supporting her leg. Sora moved with him, widening her legs and shifting her
position.
Finally, Haruka licked at her clit, the small sensation making her quiver.
Again his tongue flickered against it, and then again, and then he took a long
lick up its length.
“A-ah! Haru-chan...” she cried, rolling her head back and fisting her hands in
his hair once more. He licked again, and with another shiver, Sora pushed at
his head, forcing his lips against her pussy. So controlling... Haru thought
with a sigh, but wrapped his lips against the big, red clit before him and
began to suck.
“Haru...!” Sora moaned, shifting her body back and forth in time with his
sucks. “Y-yes, please... Ahhh...!!” Her grip tightened to become almost painful
against his scalp but Haruka didn't care – the sounds and smells of her were
intoxicating, and his dick was already hard enough that he barely noticed.
Adjusting his arm, he brought a hand to rub against the folds of her opening,
slipping his fingertips in. With another great suck, saliva dripping from his
mouth over her clit and pussy, he plunged his hand in, pressing against the
opening with his thumb. With a loud cry, Sora came, paroxysms wracking her
body. Haru continued to lick at her clit, slowing his pace, until Sora relaxed
with a sigh.
Her hands relaxed in his hair, and after a few moments they shakingly began to
smooth it down again. Haruka chuckled, shuffling further up the futon again to
look at Sora in the face. She looked unspeakably beautiful – face flushed, hair
falling over her face and shoulders, and smile as wide as he had ever seen in
her. The expression in her eyes was one that Haruka had honestly never been
certain he'd ever see – one of total adoration. He marvelled.
“I love you, Haru,” she murmured, touching his cheek.
“Me, too,” he replied honestly.
She curled her arms around his shoulders, leaning up to kiss him again. Haruka
brushed a couple of strands of hair from her shoulder, fingers dancing over her
skin. For a couple of minutes Haruka let this continue, but his patience could
only last so long and then he was pulling away just enough that he could speak.
“Can I...?”
His dick was so hard by now, straining from the delicious sounds of his twin
and from the unavoidable pressure of it against her. Already he was leaking
precome, smearing across her stomach. But he was determined not to hurt her,
and tried to control his heavy breathing.
“You don't need to ask, you know,” Sora replied, and he couldn't see her but he
could practically feel her rolling her eyes. “Just do it!”
“R-right...”
Reaching down, he spread the lips of her pussy with one hand, circling the base
of his dick with the other. He jumped at the feeling, swallowing heavily. With
one movement, he pushed inside of her; together, they cried out at the feeling.
“Ah! Yes, Haru, I love it...” Sora moaned, voice slurred with sleep and
pleasure.
“Haah... Yeah...”
Haruka bit his lip, ignoring his pounding heart. The pressure encasing his dick
was so strong, he could probably come just from this...
He moved his hips outwards, the sound of his cock moving in Sora's pussy
creating a loud, obscene slicking sound. He shuddered, the heat in his crotch
almost too much to bear. Gathering himself, he plunged in again, causing Sora
to cry out again.
“H-hurry up, Haru...!”
Not needing any further encouragement, Haruka began to pound in and out of his
sister's pussy, their hips meeting with wet smacks. With each thrust he felt
more and more dizzy, all of his other senses disappearing around him other than
the magnificent feel of Sora's cunt around his cock.
“Haru – I'm close...!”
Biting down the urge to come up the groan in her voice, Haru leaned down again
to kiss Sora full on the lips. There was no finesse in the movement – their
tongues met clumsily, their saliva dripping from their mouths.
“Sora...!” he gasped into her mouth, his thrusts becoming erratic.
“Haru, I'm -”
Suddenly, Haruka felt a jolt of pain at his neck – Sora was biting into him. At
the same time, she moaned loudly, her hips halting. Barely a moment later,
Haruka was coming, too, eyes clenched shut at the feel of the pain and the
force of the orgasm.
For a few moments they lay there, breathing heavily. Almost unconsciously,
Haruka rolled over to the side so as not to squash Sora. She was smiling at him
as before, and couldn't help but smile, too. Faintly, he realized that there
was something wet on his shoulder. He touched a fingertip – blood. Sora had
really bitten him hard. It had felt damn good, though. He hadn't known she -
It was like a switch clicked in his head. Wait. There was something wrong with
this, wasn't there?
All of a sudden, he sat up, touching his finger to the bite again. His neck.
There would be a mark there for sure – and he still had to go to school today!
“Wh-why did you do that?” he asked breathlessly, before he could think. Would
he be able to hide the mark with his collar? Unlikely unless he did up the top
button, and in that case it would be incredibly obvious what he was trying to
conceal. Could he pretend that it came from someone else? But for the last few
days he'd only been hanging out with Sora, and everyone knew it...
Panicking, he tried to get up – but was caught on his sleeve by Sora's hand.
He turned. She was still lying down on the bed, totally naked, his come
dripping from her pussy. Her wide grey eyes – precisely the same as his own –
were drawn in hurt, her lip quivering.
“Please, Haru...”
“But everyone...”
“I don't care,” she said, voice suddenly vicious. He blinked, and she had
returned to her nearly tearful state, tugging at his sleeve. “Please,” she
repeated, pleadingly.
Haruka's heart was pounding – even more so than it had been before while they
were having sex. This was insane. This was ridiculous! She knew what would
happen if anyone found out, and she knew how he felt about that...
Before his eyes, Sora's head began to move, turning away from him. At first he
thought she was deliberately avoiding his eyes, but then her neck strained,
lengthening for him.
“Please,” she repeated in a whisper.
No. He couldn't do it. For him to have a hickey was bad enough, but both of
them?! There would be no way to hide it, no way to explain it... It could be a
coincidence, but who would believe something like that...?
And yet still his heart pounded faster than ever, and he realized with an
unpleasant start that his dick was twitching, already half-hard. If he hadn't
already just come, he knew with a sickening certainty that he would be fully
erect. There was an awful feeling in the pit of his stomach, but it was growing
and growing, tightening its hold on his muscles and tendons and refusing to
allow him to leave.
Sora lay before him, skin white as an angel's, smooth as a doll's. Her
nakedness exaggerated her already vulnerable state, and even in this position
the weakness of her body was clear. Her skin was darkened with exertion, and
come pooled at the base of her pussy. And there she was lying with her neck
fully exposed to him.
Haruka's brow furrowed, sweat appearing there. He wasn't actually attracted to
this, was he? No! This was wrong! He was supposed to take care of her, not take
advantage of her! To be attracted to her, to his own twin sister, that was one
thing, but to be attracted to her weakness, her vulnerability, the extent to
which she willingly placed herself in his control...
He spluttered without words. His hands twitched, longing to move, to – to what?
What did he want? He didn't want to want this, not at all, but that wasn't even
remotely the same thing, and she was still lying there patiently, waiting for
him to move...
“Haru...” she breathed, so quietly he almost couldn't hear. “I want to be
yours.”
Shaking, he moved forward – just one centimetre, and then another. The more he
moved the easier it became, despite the increasingly desperate voice in the
back of his mind telling him to turn back now. Still he moved, until his hot
breath was caressing the skin of her neck.
His eyes trailed over the flesh. Where to do it? Where would it hurt less?
Where would it...show? Unsure what he was planning to do with that information,
he lingered on one patch of skin, just above the juncture between her neck and
her shoulder.
With a sense of tortured finality, he bit softly. Sora's reaction was
immediate, a great sigh of relief and a mewl of pleasure. Her fingers and toes
curled, neck arching back. Haruka continued to nibble at the skin, sucking
slightly. Sora hiccuped, and then giggled, and then again, delightedly.
He tried to avoid her eyes, but Sora wouldn't have it, deliberately placing
herself in his field of vision. If before she had looked adoring, the
expression she wore now was beyond even that – worshipful, even. Her eyes
glittered with unshed tears. “I love you, Haru,” she said thickly, kissing him
slowly. Haruka let his eyes close, letting her kiss him. Either she didn't
notice or didn't care about his apathy, for when she ended the kiss she giggled
again, hugging him and burying her face into his chest.
I didn't do it because I found it hot, he told himself. I did it because she
wanted me to.
When he realized that he might actually have been right, the sick feeling in
his stomach only intensified.
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