One More Sin

A/N: One-shot. Written in response to a challenge. I don't normally write het...but I hope you like it ^^;

Disclaimer: Until I enact my plan to steal Hiromu Arakawa's identity, I do not own Fullmetal Alchemist or any of its characters…

One More Sin

The moment he saw her on that fateful night in the library, he knew who she was. Her eyes had changed to an inhuman violet, and her skin had become pale and deathly. Her once kind and gentle expression was replaced by one of sin and dark humor. But there was no mistaking that face.

The scarred Ishbalan paused as he entered the abandoned house where he had taken refuge. It was dank and filled his nose with the distinct smell of mold. Old furniture was scattered broken and forgotten across the floor, making it difficult to move about in the dark. The roof and walls even had holes in it, allowing moonlight to leak down through and flood the house with an eerie glow. It was a miracle the place was still standing.

There was an obstruction of some sort. A shadow that didn't match the rest. His crimson eyes narrowed at the darkened room, knowing something was there, but unable to see. He tensed his arm warily, instinctively. "Who's there?" He called to the shadows.

A dark figure stepped into the dim light, almost flowing with unnatural grace and ease. It was a woman, he had thought at first. Dark locks hung loosely over her thin shoulders, accenting a nearly white, hauntingly familiar face. Her dress was completely black and cut low on her chest, revealing the telltale Ouroboros that graced her skin. She stood still and confident, arms folding under her breasts as she stared at him with her cool, calculating gaze. It wasn't a woman, but the homunculus known as Lust.

Though he knew that it was no longer her, Scar couldn't help but see in her the woman his brother once loved. He couldn't help but remember those precious, happy moments that they had all shared and might have shared that were now lost forever. Couldn't forget that he had once envied his brother, who had possessed her heart.

Scar raised his arm defensively, his mark tingling slightly as if it anticipated the coming fight. "Why are you here?" He growled threateningly, keeping his eyes on her deceptively slender fingers.

Lust raised her chin slightly, expression unchanged, regarding him calmly and fearlessly. "Calm down, scarred man," she spoke in her slow, sultry voice. "I'm not here to pick a fight."

The homunculus studied him silently. Scar was an anomaly to her. A remnant of her past, from the time when she was human of which she had so few memories. He was familiar, though she couldn't recall ever seeing him before. Whenever she was around him, she would feel strange, human feelings that made no sense in her mind. Emotions with no memories to go with. It was strange and confusing, causing her to lose her careful control and knock her off balance. She hated it.

Lust quickly regained her composure. Scar watched her carefully, waiting for her to continue. "You knew me back then, back when I was human," she affirmed, her voice quiet, almost wistful.

"You should leave," Scar replied tonelessly, lowering his arm but keeping his gaze locked on hers.

A strange feeling stabbed through her. Rejection, maybe? She couldn't understand all of the human emotions that felt so alien in her artificial body. But there was at least one feeling that she could recognize even- no, especially now. A smirk threatened her mouth. The homunculus turned her head to the side, and rested a slender, gloved hand over her breast seductively. "Come on, scarred man. Look me in the eyes and tell me you've never known lust."

Scar approached her slowly, and Lust made it a point by not moving away. She had no reason to be afraid, she was immortal after all. He stopped in front of her, eyes remaining unreadable. He brushed his hand over her cheek, over deathly cool skin, still unable to forget despite those feral eyes. Her expression changed slightly in idle curiosity at the sudden gentle touch. Though she didn't seem to remember him, he could never forget her. Especially those stolen moments when she was with his brother, and he wished to take the other man's place. "Unholy creature," He demanded, "why do you torment me? Why do you wear her face?"

"Her face?" Lust repeated, bemused. "This is my face."

He ignored the words and kissed her anyway, still only seeing his brother's – his old love. He pressed his lips to hers roughly, demandingly. Lust allowed him entrance, partly surprised, partly amused, but mostly something else. There it was again, another one of those unfamiliar feelings.

His tongue rolled against hers, brushing against too sharp teeth. Her taste was strange and foreign – inhuman – though not at all unpleasant. The Ishbalan moved forward, pushing her backwards into the wall and pressing himself against her finely shaped figure.

The wall hit her back rather roughly, but Lust reacted positively to the kiss– It was in her nature to do so. Though things felt so impossibly different with him. It was faint, those odd feelings welling to the surface under her skin. They tormented her mercilessly, pestering her to remember…something. She reached her arms around him, clutching at his back desperately, tearing away at his shirt with her claws and catching some skin as she did so. The man flinched against her, and Lust froze. She would have to be more careful. She needed more; she was so close, she could feel it. So close to finally understanding those human feelings that haunted her. She couldn't afford to lose him yet.

Thankfully, the scarred man continued as if nothing had happened, lost in his own illusion. His hand trailed down her face, played against her chest, and passed over the scarlet mark as he impatiently work to remove her dress. Their lips parted for breath as her dress fell slightly, and Scar immediately took to kissing her throat. One hand cupped her breast firmly, a thumb carefully teasing her nipple as the other moved along her waist to slide the rest of her dress off.

Wrong. This was so wrong. So disgustingly, wonderfully wrong. Scar was almost shaking from the intensity of these emotions. His mind blocked away the reality of the situation, searching for excuses. Her body was so beautiful, unfamiliar milky white skin contrasting his dark features so perfectly. God forgive him, for he was weak. He couldn't forget her, even in this demon body, and he wanted her so badly. What was one more sin against a lifetime's worth of sins?

The touches were hurried, almost clumsy with intensity. Scar felt himself growing more desperate, years of wanting her rising to the surface.

Scar ran his hands down her lithe form, feeling her sides and rubbing the point of her hips. Lust moaned and parted her legs slightly to allow his fingers to tentatively trace down along the insides of her thighs.

She shuddered under his grip, and Scar could feel his pants becoming slightly tighter. He massaged the insides of her legs and nuzzled against her cheek, breathing in her scent. He went on slowly, almost hesitantly. Everything seemed blurred around the edges. He had wanted this moment for so long, but why did it feel so strange? He couldn't remember.

He felt a warm dampness as he explored further, sliding a finger against the soft folds of her womanhood. Lust moaned at the touch, moving her hips towards its source. Answering the unspoken plea, he dove a single finger into her hot depths, receiving another gasp of delight.

The sin arched her back willingly as he slid his finger in and out in a slow, teasing motion. He himself trembled slightly as the pleasant heat engulfed him, and he buried another finger in growing confidence. She gasped again when his wrist unintentionally rubbed against her sensitive nub, sending a sharp jolt of pleasure through her body.

Now she was the one growing impatient, reaching down towards his pants. The material was already tight as her hand stroked along the firm bulge it found there. Hearing a quick intake of breath, Lust's hand danced to the rims of his pants and down to feel the firm flesh inside. Scar shuddered as she grasped his erection, carefully kneading it to full hardness.

A hand darted down and batted Lust's away as Scar fumbled with his pants quickly, tugging them off. He pulled her legs apart as he hastily positioned himself. Lust shuddered again with anticipation when she felt a hot nudge against her, and she struggled to wrap her legs around his waist.

Scar entered her slowly, though there was really no need to be gentle. Lust drew in quick, shuddering breaths at the sudden pleasure. She fought the urge to drive her claws into his back again, still tightening her grip slightly. She rested her chin on his shoulder, cold breath playing against his ear.

Thrusts came slowly at first, but that was quickly abandoned in favor of more energetic play. Her passage hugged him tightly, hot and slick and perfect. He moved against her hungrily, pleasure magnifying with her every movement. Even the soft pressure of sharp nails in his skin was pleasurable and enhanced the experience. His mind buzzed with passion, long forgetting the homunculus and only seeing Lust as the woman from his past.

His warmth pressed against her body, as his large calloused hands clutched her hips for support. His powerful muscles moved beneath the skin under her hands, and she found herself nuzzling against his neck encouragingly. His strong scent of sweat and sand wafted into her nose with each gasping breath. It all worked together viciously in her senses, releasing a torrent of those awful, beautiful, human emotions of a past that she couldn't recall.

Lust moaned earnestly against his shoulder, arching her back and rolling her hips to meet his thrusts. Scar responded quickly, lifting her legs slightly. The new position allowed him to reach even deeper, and the air was filled with their heady sounds.

Painfully close to his climax, Scar increased his pace with short, rough thrusts. He whispered her name between breaths, the name of the woman she once was.

The sin chuckled darkly, brushing her lips against his ear. "My name is Lust, love," she purred between her own bated breaths.

The man heard the words, mind too clouded by pleasure to really care. Whatever the name, it didn't matter, in his mind's eye it was still her. "Lust…" He panted finally, giving one last, deep thrust as he released.

She cried out as the she felt the hot liquid rush inside her, feeling something akin to her own orgasm wrack her body. There was a long pause, and everything was silent save for their rasping breath.

Scar pulled away roughly, trying to catch his breath. He couldn't bear to look at her. If he did, the fantasy would be broken, and he would be faced with the sin that he had just committed. He kept his head turned away, ignoring the sound of shifting and rustling clothes.

Lust dressed herself slowly, taking her time and savoring the sweet after-glow. It was extremely rare for her to be so satisfied. Even now, she felt herself longing for a second round. However, she knew better than to press her luck with the Ishbalan man. She had gotten what she wanted, though not all of it had been what she had intended. Those human emotions that she experienced when she saw him still remained as much of a mystery as ever. Though now, there were even more of them, and they continued swirling under the surface as she stared at Scar. Maybe next time.

Not wanting to destroy the moment, the homunculus known as Lust slipped away without saying another word.

Scar couldn't resist catching one last glimpse of her as she left. It wasn't her, and would never again be her. The time they had spent together when she was alive was gone and would never be retrieved. But in some strange and distorted way, these few sinful moments almost filled the void of the ones that had been lost.

~End~