I do not own Bleach or any of the characters involved in this story.

A/N: My first-ever Bleach fanfic! I got so fascinated by the ByaRuki pairing and simply wanted to do something for this amazing duo, and then I discovered so many well-written stories here on . But of course, I am sure many of you agree with me that there are just not enough ByaRuki lemons out here! So here I am, with my little contribution to this fandom.

It starts out with Byakuya being…well, I'd hate to call my smexy boy that, but…a jerk. It is not exactly deliberate, but I hope you guys give us some time to work out the complex emotions behind his actions.

Shadow

Chapter 1: Shadow of my sister

Rukia bit back the moan that was trying to force its way past her lips while her body trembled with the mixture of anticipation, fear and the stirrings of a budding love. This was so wrong on a thousand levels, but who was to deny passion when it reverberated so strongly within the traitorous heart?

She knew he was clearly aware too, of how forbidden and wrong this was, but she was also aware of how breaking rules was no longer foreign to him. Rules were meant to be broken, Rukia mused, and if someone like her could comprehend it, nothing more had to be said for Kuchiki Byakuya. But his honor and pride, characteristic of his noble birth, was always standing in the way. Twice, he broke the rules, and twice it would always remain. Rules were nothing but written obligations used to restrict, yet tragically, it was exactly why he was always so conflicted within, and nearly impossible to read.

His open-mouthed kisses along her shoulder blade to the back of her ear drew out another breathy gasp from her, and the fingers that parted her nether lips and caressed her exposed clit told her this was her final opportunity to reject him. She knew he was not a sex fiend, no; he was far too honorable for that. Rather, as she lay with her back pressing against his body, Kuchiki Byakuya was neither her adoptive brother, powerful captain of the sixth division of the Gotei 13, nor was he her lover. He was simply a man.

He was a man whom Fate had cruelly betrayed by taking away the one his heart had learned to love, and tried to compensate for by blessing him with a life of material wealth and prestige. He might come across as being immensely powerful and aloof, but within his heart resided a pathetic soul whose only company was named loneliness. And loneliness was strong and prominent indeed, especially given how vast the Kuchiki manor is. It was just him, her and Grandfather Kuchiki Ginrei. Silence became his soulmate.

Right now, as she found herself in such a compromising situation with him, Rukia did not know what to do. He was obviously upset; it was Hisana's death anniversary, and the usual aloofness displayed earlier on his face did nothing to convince Rukia. The wounds were still raw as they had been fifty years ago, and the pain he had been bravely masking must have been amplified a thousand times when he had to give in to the obligation of talking to Rukia about her late sister.

Every detail recounted by him seemed to push him closer to the edge, and it did not help Byakuya that Rukia was simply kneeling opposite him on the tatami. Every second went by with the increasing awareness of just how much the girl resembled Hisana, and each time the name 'Hisana' spilled from his lips bitterly, Rukia would nod with softened eyes. The softened eyes, while uncharacteristic for Rukia, were exactly the same ones Hisana used to look at him with. There was so much tenderness swimming within those mesmerizing orbs, and Kuchiki Byakuya felt the last bit of self-restraint snap when Rukia reached out and gave him an awkward, reassuring pat on the hand.

He missed her so much, and he could not think of a day in which he did not think of her. He thought about everything that had to do with her; her favorite flowers, songs, food, pastimes…everything. There were even times when he found himself wishing like a fool for a miracle, and hoping fervently that he would wake up one day to find her by his side once again. He definitely knew that was wishful thinking on his part, but had always stubbornly shoved that small voice into the recesses of his mind.

As his tongue drew itself languidly over the shell of her ear, sending erotic tingles down the column of her spine, Rukia felt her resolve to escape this situation ebb away gradually like words written in the sand by the shoreline. Every wave of passion and seduction from Byakuya washed her hesitance away, and now, she was simply waiting for him to make her his.

Love constituted a fraction of her feelings at the very most. This was not merely love; she listened to her heart and knew very well, what she was harboring for her adoptive brother was a mixture of gratitude, admiration, respect and…sympathy. She could never ever bring herself to admit this in front of anyone; she wanted everyone to respect Kuchiki Byakuya and their clan, and allow him to remain standing tall on the high pedestal society and people had put him on. He was just that respectable. On top of that, the fact that he had adopted her into the Kuchiki family so selflessly at the expense of breaking rules, something he had striven to uphold his entire life, told Rukia that there was nothing she could not or should not do for this man.

What was her virginity or physical being compared to Byakuya's momentary happiness? He had been deprived of joy for so long – Hisana's death did not merely deprive him of the pleasures of the flesh, but also, deprived him of the pleasures of emotions. It left a zombie behind, and now that the zombie was stirring, Rukia could not bring herself to send it back into the depths of hell again. Hence, despite the initial fear and uneasiness she had felt so strongly when he first kissed her, Rukia had furiously returned the kiss and took the initiative to slip her fumbling virginal hands behind the lapels of his hakama.

Yes, she could give him everything. He had done so much for her; what was a session of physical pleasures offered by her in comparison to his selfless yet silent sacrifices? It was all because of her late sister, wasn't it? Rukia did not really hold memories of Hisana, but filial piety told her she should take care of Byakuya in her sister's place, and not simply him taking care of her. Care should always be a mutual, two-way process. Her powers and ability were definitely limited and insignificant compared to his; but her love and care did not come with a price, and she would make sure he got all of it.

She raised her hand over her shoulder and cradled his head with her arm, drawing sensual circles on his nape while he continued kissing, licking and suckling on the exposed skin along her shoulders. Arching her back into him, she willingly granted him greater access to her body. A long, calloused finger played with the entrance of her moistening nether lips, rubbing up and down the slit to elicit more of the sweet juices, before finally giving in to temptation and pushing the tip of the finger in.

Rukia gasped at the strange invasion of her body; it was merely by an inch at the very most, but still it was a feeling so foreign. Her breath escaped her in short, quick rushes, especially when she felt another foreign sensation – the pressing of something long, stiff and large against her backside. She had not really explored the male anatomy for herself, but instinct told her that was definitely something that belonged to Byakuya. Like the rest of him, it exuded a sense of power, strength and determination.

Then his finger started moving, rubbing against her unexplored vaginal walls, and Rukia bit her lower lip at the rush of new sensations to her senses. She was falling apart, just like the petal blades of his Senbonzakura, as he played her body like an instrument in his arms. Incoherent words escaped her lips as she tried to question the strange feelings that had graced her body for the very first time, but he did not reply. "Ah…this…what…" She whimpered softly, tightening her hold on him, only to receive silence again. Rukia ground into his stiff erection, but still, the only reaction from Byakuya was a shuddering intake of breath.

The realization of the lack of verbal response from him sent her into a momentary silence; she knew he was a quiet, stoic person, but this silence was abnormal. Was he just not in the mood for words, or was he simply worried that words would give all his painstakingly created illusions away? Was he unwilling to speak to her for fear of hearing Rukia's deeper, richer voice, instead of hearing Hisana's breathy, high-pitched whispers? It was then when Rukia realized why he had positioned himself behind her all along, preferring this position whereby he had no way of seeing her face as he took pleasures from her and pleasured her in return.

The complex within him was still so…she sighed, giving up on finding a suitable term for it.

But all coherent thoughts flew out of her mind when she felt his finger leave to make way for something so much larger, heavier and intimidating. It poised itself at her vaginal entrance, the part of her body which was foreign and unknown to even her, probing at the soft folds there. What was he about to do? Rukia thought, wondering if he was going to put it inside her body like what he had done with his finger. She bent her head to try to catch a glimpse of it, and then she caught sight of the most private part of her adoptive brother, standing firm, proud and reddish, pressing against her womanly areas. It looked strange and forbidden, for wasn't that part of her where her monthly blood came from? She had all along believed it to be filthy and disgusting.

Byakuya's hips shifted behind her, and the heavy organ pressing into her so intimidatingly and sensually slid up and down her weeping core. But how could something so big fit into her? It had to hurt. Yet heavily aroused, Rukia could not hesitate any longer. It was something all women had to do someday, wasn't it? At least, women who had found men to do it with. It sent deliciously romantic waves rising in the recesses of her heart; she was about to do something with Byakuya that only took place between couples.

The arm around Rukia's waist tightened, while another guided the tip of his manhood to her vagina entrance. Byakuya gritted his teeth as he felt the long-forgotten sexual pleasure wash over him with the increasing pressure he was applying onto the female entrance. Drawing the stiffening yet unresisting female body closer to him, he bestowed another row of kisses along her cheek, breathing in the feminine fragrances of her hair. The tight ring of vaginal muscles strained to accommodate his girth, and the female body within his embrace arched and stiffened more before the head of his manhood finally made it past the tightness to slide all the way up to a barrier of skin.

His eyes flew open, and so did hers. The barrier of skin…Byakuya's eyes widened and reality slammed into him like a sledgehammer, reminding him this was indeed not Hisana as he had tried to fool himself into thinking. Hisana was gone, gone with the wind, and she would never return. This was…

"Byakuya-sama…"

He froze at hearing the familiar voice, and the sound of his name uttered by it, complete with the honorific. Byakuya failed to see the face of the woman lying in his arms. If he had seen her face, he would have been able to see the wistful expression of sorrow, accentuated by a selfless, willing smile.

Rukia was not stupid; she knew his reservations; the freshness of her virginal body only served to remind him how she was Kuchiki Rukia, not Hisana. So she called out to him in a pitch of voice she was not too accustomed to speaking in, calling out his name in the way women married into aristocratic families addressed their husbands. If he could not fool himself into allowing his own body this momentary release, Rukia would fool him.

Then she bravely lowered herself onto him, and felt him push upwards at the very same time to breach the barrier within her. A stab of sharp pain was felt, before discomfort set in and Rukia was left weakened and trembling within his arms, which had tightened involuntarily around her as if to comfort her. All she could feel was the dull ache that had set in after the passing of the acute pain, and there was a weird sensation of being filled and stuffed like a toy. Was this how sex was supposed to be like? She wondered. She would have to ask the other females…Rangiku, perhaps?

The only thing that kept her from escaping this discomfort was the strong presence of the man behind her, and the growing knowledge that she was now his. She was the second woman of her family to give herself entirely to the Kuchiki noble family, namely Kuchiki Byakuya. Rukia smiled a smile of satisfaction; in all her years of interaction with her adoptive brother, she had never felt so much life energy from him. His reiatsu was even stronger and more distinct than ever, but instead of it being an entity which barred her out, it was now enveloping her snugly as well.

Then he pulled out of her. Just as she was wondering if that signified the end of the sex and thinking just what was so pleasurable about it, Byakuya thrust forward again to fill her to the hilt with his manhood. Unprepared for the new sensations, Rukia cried out and threw her head back, feeling the soft strands of his hair caress her cheek. The feelings were so intense, so raw and they were threatening to wash her away out into the deep, deep ocean of pleasure.

A few more strokes, hard, measured yet erotic, sent her spiraling. She did not know if she was spiraling up or down, but her mind was simply whirling with no specific direction and she felt like a lone boat in the wild choppy seas. But he was her anchor, and he was holding her tight as the sounds of slick skin slapping against slick skin filled the room, while cries and moans of pleasure danced in the rhythm. She never knew she could elicit groans and soft gasps from her impossibly handsome brother. Rukia found herself smiling weakly despite the intense waves of sensations, but as he pushed so deep into her such that she felt he could not go further, she heard him speak for the first time that night.

"Hisana…"

Then the first tear of the night rolled down from the side of her eyes, as melancholy stabbed mercilessly into her young heart. She was merely a shadow...Hisana's shadow.

To be continued…

A/N: Please let me know what you think! I am totally sitting at the edge of my seat.