For those of you that wanted something smuttier to sink your teeth into, I give you 'Gravity'! gotta say, had fun writing this story. It's like a 'Bound'-lite. What is 'Bound', you may wonder? Well, not to be a complete tease, but it's another Aya/Aki story I've got written in rough draft…and yes, it's a little darker than this one. 'Bound' is like an AU of 'Steps', in which Aki's character is a little more…shall we say 'influenced'? by his 'past self'.

Anywho…let's not get into that right now. O:-D

Gravity

Principal One: Pressure

The door creaked open, but Aya didn't stir. Even unconscious she knew it was Thursday, and Thursday was the one night a week that Yuuhi stayed late at the restaurant to go over the books. It was the same every week, and it didn't take long for the body to learn patterns. Even subconsciously.

For several long moments, habitual comfort reigned in the bedroom.

To and fro, the bed dipped and shifted like a ship rolling on a mild sea. She sighed contentedly as a familiar arm closed gently around, anchoring her to him in the peaceful eddying of her awareness. Warm lips pressed against her hair, moved in silent words as his heat seeped through her thin nightshirt. She half-consciously stretched her toes back and wound her foot around his ankle, rubbing skin against skin. Settling into the position that she preferred, she slowly drifted back under.

It was some time later that she woke again. If waking you could call it, since she only roused enough to register her own sleepy moan. He had lifted her hair over her shoulder, and was licking her neck in long, slow lines. His right hand had determinedly unbuttoned her thin nightshirt, and was lazily playing with her breast, every so often scratching over the nipple.

Apparently, he had been at it for awhile, because she was already soaking wet, her thighs squeezing and relaxing in an expectant rhythm. She sighed, letting herself relax into his gentle touches, savoring the unique feeling of floating between sleep and waking.

Their lovemaking was often urgent and passionate, but she liked it this way, too---like gentle waves lapping over her body---taking her breath, but not drowning her in sensation.

His hand slid down to her hip, and she relaxed even more, her breath deepening, though she still remained half-awake. It changed it somehow. She wanted nothing in the world, but to lie there in such amazing warmth and comfort as he did whatever he wanted to her.

His hand traced along the band of her panties, and without thought she obliged him, letting her legs fall open slowly in invitation. Pausing for only a breath, he slid his hand down into her panties, humming softly against the back of her neck as he encountered how very wet she was. Another sleepy moan as he gently pressed the pad of his finger against her. Her legs twitched reflexively, and her breath sped up slightly as he began to lightly play with the nub, rubbing his finger over the sensitive nerves, but only barely. She squirmed slightly, legs moving restlessly under the covers, sliding up and down his ankles.

"More," she whispered, and felt his hand shudder against her, his breath hit her neck in a deep exhale. She slowly caressed her hand down and guided his, pressing him harder against her. Never one to keep quiet, she whispered her approval, encouragement. She loved when he got adventurous like this, and it had secretly been one of her fantasies to have him make love to her in her sleep. Either to fall asleep with him thrusting gently into her, or wake up on the verge of climax, feeling him emptying his seed into her. She had yet to tell him such a thing, they had only been living together three months, and sometimes it wasn't easy for her to tell him her inner-most desires. The right words never seemed to come to her, and she knew sometimes she could be quite off-putting with her boldness. But maybe she didn't have to tell him anything. Maybe this was something they would grow into together.

"Oh yes," she hummed, shifting her hips slightly and feeling his hot, naked skin spooned against her back, the curve of her butt fitting right into the hollow of his pelvis. He was already hard, and she moaned again at the feel of his moist, smooth flesh rubbing against her thighs. She let go of his hand and reached over her own hip, grasping his erection and gently pulling on it. He moaned, his hand unconsciously digging deeper into her as she ran her thumb in slow circles over his wet slit, spreading his pre-cum over the flared head of his cock, then down, on the underside, where the flesh was ridged and throbbing with blood.

He pressed closer to her back, his hard nipples tickling her skin, and she could feel him panting in her hair, clearly enjoying her attentions. Slowly she fisted her fingers, sliding her hand up and down, movements becoming smoother as more moisture squeezed out. He began to push gently back against her hand, tightening his arm around her and pulling her flush against him. His mouth nipped at her shoulder, her ear, he sealed his lips over her throat and lapped at her salty skin. His hand then slid right down, and he pushed his finger inside her.

She buried her face in the pillow and bit down, her hand convulsing around him without warning. She squeezed her thighs around his hand reflexively, her hips spasming as he slowly slid his finger out, then back in deeply. He worked a second finger into her, gently sliding them in and out as she squeezed her eyes closed and panted.

Slowly her legs relaxed, loosening her grip on his hand and falling open once more. Clearly understanding her unconscious signals, he pressed deeper inside her, spreading his fingers and sending another shudder of pleasure right through her. She found herself curving her back, trying to find that one edge of friction she knew would...she wanted...

Her hand closed once more on his shaft, having loosened with the distraction of her own pleasure. But holding the most vulnerable part of him in her hand was a pleasure all on its own. It sent a throb right through her that she could feel contracting around his fingers. It felt like hot steel and ice sparking off of each other. It seared her neves, curved her fingers, and twitched in her muscles like an electrical current.

"Please," she gasped, knowing only that she wanted to go higher, faster. She slid her hand back to rest against his hip, wiggling her butt back and tilting it just enough. She pressed down on his hip, trying to urge him closer, and he obliged, removing his fingers with a wet squelch and wrapping then around his own sex, mixing her wetness with his own. Her hand slipped over his restlessly, touching and stroking him as he tried to find the angle they wanted. He was so slick with their combined juices that her fingers glided effortlessly across his ridged flesh, following veins and feeling his pulse throbbing like a second heart beat.

She helped guide him to her entrance, her inner muscles already clenching in anticipation of his penetration. God, yes! Please! she thought. But he still didn't hurry. He rubbed back and forth across her opening, dragging heat and hardness across her most sensitive of places. He would slip the edge of the very tip in, catch and stretch her on the 'grooves' of the head, then slowly pull out again, angling up just enough with his hips to run his hot flesh over her clit, back and forth, back and forth.

It wasn't as if he was trying to torture her on purpose...It was like he was trying to savor the moment. Savor the feel and intimate heat of her.

She was sure she was flattered, on some higher level of consciousness, but all she really wanted was for him to be inside her already.

"Please," she whispered huskily, pushing back against him. If he continued to touch her like that, all drawn out and slow, teasing touches, she feared the fabric of her sanity might completely unravel. She could already feel it fraying under the pressure of his attentions.

He paused, leaking wetness on her clit, then his erection slithered slowly back, falling into the dip of her entrance and resting there for one long moment.

Then he was in an inch, his breath in her hair not quite speeding up, but definitely growing deeper.

Another inch, and she clenched her teeth, her hands, her inner muscles shuddered, squeezing hard around him and nearly pushing him back out.

Another inch, her thighs spasmed, and more wetness spilled out from around him, lubricating her more, but also sending a finger of sensation to tickle along her nerves.

Another slow stretch of skin, another slow inch, and she couldn't take it anymore. She pushed her hips back hard, driving all of him in at once, and clearly shocking him into crying out.

"AYA!"

She was shocked, too.

"What," she gasped. "What are you---nnnhh!"

His hips moved in one smooth motion, that long, curved piece of him pulling out, then pushing back into her, deep as it could go.

Yuuhi...Yuuhi wasn't curved...

"Aki?!"

Again. And again.

"Ah! HAH!"

He wasn't going fast, not yet, but he was going deep. Deeper than she thought was even possible. It was like she could feel every bit of him, lines and ridges and veins, all throbbing inside her, pulsing, swelling---like something alive.

"No—mmh!"

"Aya...!" he panted hotly.

She whimpered, not understanding how it could feel so good still---didn't her body understand that they couldn't be doing this? That he was her brother?!

Another jolt of pleasure, sharper than before. Her breath hitched, and she grabbed fistfuls of sheet, twisting them violently.

No! Don't cry out! Don't feel this way!

"Aya," he cried, actually sounding as if he were in pain. "You don't know how long---!"

NO!

"How long---MMH!---"

Don't say it!! Don't! Don't! Don't!---

"---I've! Wanted! You!"

GOD! Oh god!

He pushed harder into her, meeting no resistance as her body was already so wet and soft.

"You feel!"---His hip hit her thigh with a wet smacking sound---"So!"---He drew back---"Good!" His balls slapped against her thighs, audibly. Again and again.

A hot, illicit, whisper in her ear, she whimpered, opening and closing her hands, but not knowing what to do. She couldn't seem to think clearly. Everything was being swallowed up into a fog of pleasure, and confusion. She closed her eyes, trying desperately to block everything out, to fill her head with white noise so she wouldn't have to think about what was happening.

But all it did was make everything worse. Or better.

"You're so tight! So hot and tight---" a strained pant against her ear. "---just like I imagined you'd be---have you---have you thought about me like this, too?" Louder than a pant, he moaned, a sound of pure thoughtlessness and lust, as his hands tightened on her, pulling her hips back roughly so that he could push that much more of himself into her.

"Onii-chan," she gasped shallowly. It was the only answer she could think of in her sense-muddled-mind. Even if she didn't quite understand what it meant. Or what she meant to say. Or anything at all.

His breathing noticeably increased in fervor, and instead of taking her answer as an argument or denial, he clearly decided to take it as a direction. "Brother---that's right. I am your brother," and on his next deep thrust, he twisted his hip, shifting the angle of his penetration only slightly, but just enough to hit something inside her that no one had ever touched before. Her eyes went wide and wild as all the air in her lungs abruptly burst from her lips in a sudden loud keening.

He liked the sound. He clearly did. She could tell because he shuddered almost violently inside her, before his pace increased noticeably. His pant was louder now, sharper, almost a moan as he kept his lips pressed so close to her ear. "Have you...ever wondered...what it would be like...to have your brother's cock inside you?"

She should react to that, shouldn't she? He had said something bad...hadn't he?

But oh gods, she couldn't think. She was so hot. She felt like she was teetering on some sharp edge, on the verge of falling. Only...only...gravity didn't seem to work anymore. The entire world was turned upside down, and when she fell...she might instead go flying off the ground.

With her eyes closed, his hands burned on her, his lips seared. With her eyes closed, her other senses blossomed under his voice, his touch, rather than wilting in confusion. She could taste the scent of him at the back of her throat. The salty, strange scent of sex. And beneathe it---or more, mixed with it---the familiar, comforting scent of her brother.

The two scents were so tangled now that she could hardly distinguish between them. Scent, she knew, was a powerful tinderbox for memory. She could feel this particular scent imprinting somewhere deep in her subconscious, in that place that remained at every individual's centre. A soul, maybe, or a tiny kernel of instinct, the leftovers of something primal---Whatever it was, it shifted imperceptibly. She would remember these two scents intertwined. They would spark off each other, and she would remember.

With her eyes closed, feelings intensified. The firm grip of his hand on her hip, pulling her back against him as he pushed in. His lips and tongue tracing over the back of her neck now. He seemed impossibly large inside her, she could feel him pushing in to the base of his body every time, repeatedly hitting her cervix---It was such a unique tableau of pleasure and tightness, and a tiny fissure of pain. But not pain---A fullness, a sharpness to the pleasure.

The sounds were the worst. A gentle squeaking of the box-spring, the dull slapping of skin against skin, and his breath...Yuuhi was quiet when he made love to her. He had yet to fully realize the sensuality of sound. To her, anyway.

But Aki seemed to have no reservation with letting her know how good she felt. Not coherently. Not even eloquently sometimes, random words, half-words, erotic whispers. And her name. Above all else, he seemed to really like saying it.

Her inner-muscles tightened reflexively with every hot whisper of her name.

A quick twist, and cold air hit her body, making her shudder hard. Her eyes shot open as he shoved the covers off of them completely. His hand slid from her hip, grasping her thigh, and he lifted, hooking his arm under her knee. He went even deeper inside her.

"Ah!" She clawed at the bed, struggled for a moment, not away from him---just...movement. Her head flinging back and forth. His arm slid under her, gathering her closer, and anchoring her slightly.

When she calmed down again, her senses came back to her, beyond the ever tightening coil of pleasure. All around her the room was shadows and foreign shapes, the darkness washing everything of colour. But out of her peripheral she could see a halo of gold, dimmed by the darkness, but still retaining some of its pale sparkle. She quickly closed her eyes again, not wanting to see more, but strong fingers were on her jaw, gentle, but inescapable as steel bands. He slowly turned her face to him. The motion of his body didn't stop, he continued to rock into her, but now his breath was along her cheek, his lips. He whispered her name, no more than a movement of his mouth, before he sealed his lips over hers, lazily licking at her and sucking at her tongue as it lay passive in shock under his ministrations.

Without warning his hand slid down between her legs, pressing firmly against her. She cried out, pushing the sound deep in his mouth as he moaned in return. Her hips moved on their own, pushing back against him and squeezing hard around his length. He let go of her mouth with another cry, still half-hovering over her so he could see the shadowed frenzy of their joining. Something about the sight of it pushed him farther. His thrusts were speeding up in that familiar way, his breath sharpening to a moan against her ear. And seemingly without thought, he began licking her, whatever part of her his mouth could reach---her throat, her cheek, the sensitive shell of her ear.

His fingers deepened and sped up, even as his body did. She was no innocent in this, she could tell he was going to come soon, and with the realization came a sudden flash of an image, of his seed spurting inside her, never-ending hot streams. She cried out, her nails suddenly digging into his arm.

After that it was all feeling, an ever-expanding ball of pleasure and lightning sparks in her stomach, until her body felt too small to contain it, too tight to hold together anymore. She gasped hard, her eyes nearly rolling back as her limbs seized, her body curling tight in motion, though it seemed that her centre snapped taut with some strange floaty, throbbing sensation. Like her hips were lifting off the bed, and he was ice-cold, and fire inside her.

"Aya...!"

She flashed back to awareness for one short moment, just long enough to register she was on her back now, and he was above her, their quivering bellies sliding in sweat as the muscles of his forearms strained under the clawing grasp of her hands. She could feel her legs spread wide and bent as his hips slammed against her thighs now without pause. Her nightshirt was tangled about her elbows, her breasts bouncing freely against his chest from the force of his passion.

She stared up at the ceiling in confusion, listening to the bed shift and bang from what seemed like a long distance away. Wetness was trickling and cooling down between her legs, soaking into the pale sheets beneathe her.

Twinges of pleasure still shook her body, like tiny little after-shocks. In her hazy mind she imagined blue arcs of electricity tracing her hands, her thighs, every place that they touched.

He drew back, just enough to see the shadowed edge of her face, and she quickly closed her eyes once more.

He kept wanting to look at her---She didn't want to see.

"Aya...!"

She went away again, just for another strange moment. Because the next thing she knew, she was coming again, her hips lifting off the bed as he pushed into her. His toes were digging into the tangled sheets, his knees, and his balls were slapping loudly against her wet thighs.

"Aya...! Aya...! Aya!"

It was happening. She could feel the shaking of his body increasing rapidly, the tightness of his muscles. His stomach was caving in, drawing in more as he began to roll his hips harder, as the pitch of his voice began to take on a feverish pitch.

"Aya! Aya! hhAH! AYA!AYA!AYA!AY—AHHH!!!"

He thrust into her one last time, hard enough that he lifted her lower-half up off the bed, then held her suspended like that as he suddenly went still, save for the involuntary twitching of his hips.

And that piece of his body that was buried so deeply inside her.

"NNH!!NHHA!!---AYA!"

She lay there, dazed and still coming down from her second climax as he spasmed inside her, his seed gushing into her in sporadic jets.

No one had ever come inside her before, not as they were meant to, and part of her reeled at the feeling of her brother's seed spurting inside her, his cock buried so deep and tight that she could feel the way it jerked, the way his essence erupted almost violently, splattering across her insides and emptying without reserve into her womb. For one short second, not even long enough to be remembered, she wanted to cling longer to this feeling, unravel it, possess it. At the same time, another part of her seemed to shut down and simply sink back into a dark space of nothingness.

He collapsed forward, his eyes leaking tears in her hair and her body still clenching and fluttering around him in reaction. She didn't protest his weight, nor the restricting placement of his hands and legs. Nor even his softening erection, still fully buried inside her. She sprawled limply across the bed, tired and exhausted, and feeling only a white static in her head.

He smoothly slid out of her, resting against her trembling thigh and still continuing to weep tears of pleasure. She could feel his come, slowly trickling from her entrance, cooling, tickling lines that made the bed uncomfortably wet beneathe her. She was noticing details that she never noticed when Yuuhi was inside her. Even as she seemed to float in a haze of disconnection.

She remembered her hand wrapped intimately around him, the spark of a moment when her very skin seemed to shudder with familiarity and newness. And the way her mind had quickly turned her away from such things. For one second, she grasped it, some elusive epiphany in her mind, but it quickly slipped through her fingers like minnows darting back into deeper waters. Everything seemed to be slipping away...

He stroked her hair lazily, pressing sweet, clumsy kisses to her shoulder as she took slow, deep...strange breaths. Soaking in the scent of sex.

And her brother.

And how there was no longer a clear separation between the two in her mind

"Aya..."

She slowly closed her eyes, and the world disappeared again.

TBC...