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A Filthy Sin

Summary:

After dating Zack Fair for a few months, Cloud feels ready to ask his alpha to claim him. One night, he unfortunately and unexpectedly goes into heat, drawing the attention and bite of Sephiroth. How will he cope when Zack still wants to be with him, and when Sephiroth plans on making Cloud his mate?

Chapter 1: A Puppet for the Puppeteer

Chapter Text

A Filthy Sin

 

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Cloud considered himself blessed and truly lucky, especially after everything he’d suffered through, after every trial, after every ordeal. Anyone would’ve been broken, but in the end, he’d bore it all and been successful.

Not only had he saved Gaia from Meteor, but he’d also managed to banish Sephiroth, forever. The One Winged Angel was gone, leaving Cloud’s nightmares to disappear into the wind like soft whispers. The ghosts of his past no longer could haunt and terrorize him, and that had been a great achievement the young man didn’t ever think possible.

Everything had slowly returned to a trace of normalcy all across Midgar. Though the sectors were all badly damaged and crumbling apart, piece by piece, they all had hope for their future, now. This was a gift no one could take away from them, ever, and it was all thanks to Aerith’s final sacrifice.

For love, she’d brought Zack back from the dead, this time, giving him a new life, giving him a piece of her soul to be cherished and remembered. It was wonderful to have his best friend back again, but with Aerith gone, Zack became introverted, depressed, and aloof.

Aerith had trusted Zack’s well-being and safety with Cloud, leaving her lover’s fate to the former infantryman, knowing they could take care of each other now that she was gone. Together, they relied on each other to pick up the broken bits, and in time, Cloud and Zack healed from their emotional wounds and psychological scars.

Not long after they planned to rebuild the city, Cloud also discovered that nature had many surprises in store.

Tifa, while still claiming she loved him very much, revealed to him that she was an omega. Deep down, Cloud knew it wasn’t ever going to work between them, for he was an omega, as well. After a tearful confession, they chose to remain friends, and they found themselves walking different paths.

Vincent Valentine, the normally silent, reserved, and stoic of their group had offered to take care of Tifa. As it were, Vincent was an alpha. From what Cloud knew, Vincent disclosed that he was once madly and passionately in love with a woman named Lucrecia Crescent. That love wasn’t fully returned, however, and after years of ruminating as he slept away in the Shinra Manor basement in his coffin prior to Avalanche stumbling upon him, Vincent had slowly gotten over Lucrecia.

Loving her in memories of their past and innocent days, only, he chose to start a new chapter with Tifa Lockhart at his side, as his mate. Tifa ended up growing closer to Vincent Valentine, who seemed to care for her and love her to pieces. Cloud was happy for them, and while he longed to find a trace of his own love and happiness, it landed right in his lap, accidentally.

Though all hope wasn’t lost, now that Tifa spent her hours with Vincent, Cloud turned to Zack, and they resumed rekindling their friendship and all the good times they fondly remembered. Of course, in time, the relationship grew and developed.

It started out as a friendship akin to their Shinra Electric Power Company days, where they kept each other company, went on long walks, chatted later and later from dusk until dawn. Not much had changed, but their friendship only blossomed into something deeper when Zack admitted to Cloud that he wished for their relationship to be taken to a more intimate level.

Two friends discovering a newfound love and need for each other? No one in Midgar who knew of them could say they were shocked, truly. Everyone supported them, sharing in their happiness.

Content with that, Cloud happily agreed to these new terms and conditions, and the alpha and omega established a pleasant, romantic relationship for months. Taking it one day at a time, they never went beyond exchanging light kisses and holding each other. Their embraces were always cut so short when Zack sensed Cloud’s heat was growing near.

Evidently, Zack didn’t want to ever attack Cloud. He wanted for Cloud to come to him willingly, and only ask them to bond when the irrational sides of his heat had subsided.

Admirable and commendable, but ridiculously unrealistic, as well.

Peeved and frustrated, Cloud took a small break from Zack, visiting with Tifa and asking her opinion. It helped to bounce ideas off another omega, so he was properly listened to and understood. Tifa helped Cloud realize that deep down, he was in love with Zack, and that he wanted nothing more than to become a life mate with the oddball of an alpha.

That was what he truly desired and wanted, all along!

Thanking Tifa for assisting in him understanding his wishes, Cloud traveled the journey back to his dingy home shared with Zack. It was a cold night, but Cloud felt he had the fires of happiness and enthusiasm burning from inside out. For the entire walk, he bundled himself up in his dark jacket, smiling as he thought of sharing the good news with his alpha.

How happy they would be, together! Zack would be so proud, and now that Cloud felt prepared, his heart was overflowing with serene joy he could hardly conceal. Smiling was the only thing he knew how to do, and he was so distracted that he missed the rosy glow emanating from his cheeks, rising steadily to his face.

Heat surged forth all around, and by the time Cloud dipped into the surrounding forest, he felt extremely dizzy and nauseous. Wondering how that could be when he’d eaten light meals and hadn’t done anything to overstress himself, the lean omega propped himself between two trees, eyes rolling back in his head while he struggled to catch his breath.

His lungs were rapidly expanding in his chest, and he beat against his own sternum, his tightly clenched fist shaking as badly as he knees. They buckled, sending him crashing clumsily to the leafy, green grounds. Rolling about in the grass while he coughed and sputtered, Cloud’s vision turned dim, foggy, and hazy, but there wasn’t anything he could do about it.

Supposing he’d been cleverly attacked, somehow, he tried searching his surroundings for the culprit behind this shrewd ploy, when he suddenly remembered a brutally disturbing fact.

This was his first heat…all his life, his body had been too exhausted and stressed, constantly pushed beyond the limits due to fighting and trying to win the damn war for their planet. As a result, Cloud’s body had suppressed his heats, but now that he hadn’t been as active in the field of combat, his heat was stronger, more aggressive, and far too dangerous.

Liquids seeped out of his hole, and he felt it twitching, clenching and opening, no doubt ready for deep penetration…yes, an alpha’s thick cock…

Growling in anguish, he tried standing, but it wasn’t going to work. His body assumed the natural position for mating, and he ground himself against the grass, ass pert in the air, legs spread, arms flailing desperately.

Blinking past his hot tears, Cloud felt his spine about to explode and he wept internally. Zack! Please! Help! Zack!

Every damn alpha in the area would no doubt soon scent and be on the way to rape him, and he wasn’t going to be able to do a damn thing about it. His mind was already arousing him to the idea of multiple alpha cocks ramming into his body, and he couldn’t help but cry out for that, alone.

Zack! I don’t want this!

Nothing was working in his favor, especially not when Cloud saw a few dark feathers raining from the sky, landing right before his nose. Knowing who it was before his eyes caught up, Cloud shut them as he wailed. He’d tried to make a sound as a cry for help, but it came out only as a damn moan.

Shameful.

Long, dark boots softly landed on the earth, and a sharp weapon pointed directly into Cloud’s forehead. The blade never sank past his flesh, thankfully, but it was enough for Cloud to silence himself, though he still wriggled and writhed, tearing the grass right out from the soil.

Eyes wandering up along the long, muscular legs and the perfectly clean, shiny uniform, Cloud felt the wind breezing by, and it blew to the side the long, silvery locks of his sworn enemy. The enemy he’d been so sure he’d gotten rid of…

In a wanton moan, Cloud panted, “Sephiroth…”

The infamous ex-SOLDIER glanced down at him, pleased to see his nemesis squirming in pure agony. Clutching his Masamune tightly in his left hand, Sephiroth beamed at Cloud, slowly kneeling as he reached forth with a hand and ran a few of his gloved fingers through Cloud’s sweaty, messy hair.

“Nugh!” Cloud shut his eyes, hips twitching, much against his will, and much to his own mortification. What kind of a shameful whore was he to wag his hips like this for Sephiroth?! What was wrong with his body?

Not trusting his mouth, Cloud bit down hard on his tongue, then the insides of his cheeks, crying silently in pain as blood filled his mouth.

Not yet getting to his feet, Sephiroth examined Cloud closely for a moment, then dipped his head to one side. Eyes twinkling perversely, he then stared on at Cloud’s body, taking notice of how drenched his clothes were from perspiration.

Clicking his tongue against his teeth, Sephiroth softly declaimed, “This is quite the sight, isn’t it?” Chuckling, he nudged Cloud with the length of his Masamune, though he didn’t move to harm the youth.

Turning him over, Sephiroth softly whispered, “Where is your wound?”

Frozen for a moment, Cloud gasped, finally realizing that Sephiroth had naturally assumed he was in a different kind of pain and turmoil, altogether.

Confused and dazed, Sephiroth’s opalescent eyes wandered along Cloud’s body, and as he studied his foe, he frowned, brow creased, and eyebrows knotted tightly. “You…you haven’t been hurt…this isn’t blood, then?” Pressing a hand onto the center of Cloud’s back, he then hissed, drawing his limb away and staring at the open palm.

Sniffing slowly at his hand, Sephiroth then reeled back, eyes turning a shade darker. “This…this is sweat…this isn’t blood…” Nostrils flaring dangerously, his lips then curled back over his sharp teeth, and he resembled a large predator, ready to devour and consume as he loomed over Cloud.

Shaking his head weakly, Cloud nearly choked on his own saliva as he wept profusely, “P-please! I n-need…aaagh! P-please!”

Bending over the tortured omega, Sephiroth sniffed at him, eyes turning darker and more menacing as he practically salivated once he inhaled the scent at the back of Cloud’s neck.

Feeling Sephiroth’s lips hovering inches over his skin, Cloud’s eyes blew open as he wailed for the world to hear, “No! Wait! Don’t!”

It was quite obvious that Sephiroth was an alpha, and he was making his intentions rather clear. Already, Cloud had the sea of questions to ask, especially regarding how and why Sephiroth had returned. This wasn’t a foul memory; memories couldn’t make contact, memories couldn’t touch him, and memories were never this intense…

Weeping and sobbing fat tears into the grass, Cloud’s whole world grew bleak and sordid as he tried begging for mercy repeatedly. “N-nooo! Don’t d-do this, Sephiroth!”

Panting as the layers fell and the veil was pulled back, Sephiroth huffed out in a steamy, foggy breath that was visible in the night. “This is fitting, isn’t it, Cloud?” Running his vorant fingers over Cloud’s shoulders and back, he wasn’t aiming to tickle the young man, but the way his fingertips ghosted over Cloud’s muscles was infuriating in all the pleasurable ways.

One of Sephiroth’s large, wide hands landed on Cloud’s rump, and the omega wailed, begging and pleading for more, while also wishing he could shove Sephiroth’s limb off himself. Weakened and delirious, he gasped and choked, inching his waist off the ground as he arched his back and hit Sephiroth’s chest.

The other warrior was directly behind him, planting his right hand near Cloud’s hip, while the left one skated between Cloud’s body. Toying and teasing with the cleft, Sephiroth’s fingers dug into the seam of the back of Cloud’s pants, and the omega felt even more ashamed of his body’s reactions when more slickness gushed out of himself and coated the fabric of his pants.

“Nooo! I d-don’t want this!”

Smirking, Sephiroth hissed into his neck, “I’m afraid your body says otherwise, Cloud. Do you have any idea what kind of a view I have, here?”

As Cloud writhed and moaned, Sephiroth continued, ever so happy to narrate it all to humiliate the omega in the throes of his heat.

“I will admit, I traveled here with the intent of ending your pathetic life, but before I do that, I think I’ll enjoy myself. This is a rare gift that’s landed in my lap, Cloud, and I want to take my time playing, first…”

A potent wave of pheromones rose in the air, like vapors and toxic mist flying up from the ground and covering the lands. Cloud nearly threw up as he scented the alpha, and his fingers and toes automatically loosened as he crumpled down onto his chest and stomach like a piece of meat.

And that’s what all omegas were to sadistic alphas like Sephiroth. Cloud had been happy with Zack, knowing they had taken their relationship slowly. He’d been saving himself for his friend, only, wanting to experience all their firsts, together. Now, Sephiroth was adamant on robbing him of that, of ruining everything…times hadn’t changed, at all.

Sniffling, Cloud knew it was all over. His joints were locked into place, and his body wasn’t going to obey him. Not unless his heat was over.

Softly, he whimpered, “Just…just hurry…please…make it fast…”

Pausing, Sephiroth’s eyes widened as he drew himself back, shaking his head firmly. “I’m afraid I’ll be doing no such thing, my dear Cloud.” Ruffling the golden mop of hair atop Cloud’s skull, he basked in the omega’s warmth, grinding his hips against Cloud’s ass, though he never went beyond that.

Cruelly chuckling at all the reactions he was wrenching out of Cloud minute by minute, Sephiroth eyed the spot on the back of Cloud’s neck, salivating as he drew himself closer to that special place.

Freezing, Cloud whined when he felt a warm gush of air hitting him on the back of the neck. Eyes darting from side to side, he cravenly wept, “What’re you doing?! Why are you—”

“Shh,” Sephiroth cooed down at him, long hair appearing black in the shadows while his eyes glowed with a strange sort of fire brewing in the center of his irises. “Only an alpha mating you will calm you, now, or, you have the option of receiving his bite.”

Despising either of those, Cloud quivered, trying to collect his limbs into his chest. The tip of his nose was pink as he pleaded incessantly, “You c-can’t! You can’t do this to me!”

Ignoring his discomfort, Sephiroth answered boldly, “I’m going to bite you, instead, so compose yourself.” When Cloud tried rearing up, again, Sephiroth ordered, “Compose yourself, omega.”

Relaxing once he was convinced Sephiroth wasn’t going to rape him, Cloud’s breathing regulated, but it was only a short-lived celebration and respite.

Snidely, Sephiroth tugged at his hair as he whispered heatedly, “Yes…I won’t fuck you today, Cloud. Why rush something we could both enjoy?”

Understanding enough of his biology and the way alpha and omega relations and bonds worked, Cloud knew that a single bite from any alpha on his heat, regardless of whether intercourse had occurred, would bind him to that specific alpha.

So, that had been Sephiroth’s plan, in the end. The son of a bitch…he was so cruel…so clever…he knew what he was doing, and he was enjoying it as much as anyone malicious could.

At the height of his turmoil and agony, Cloud belted out as potently as he could, “ZACK! HELP ME!”

When he tried to raise his head, Sephiroth pushed down on the back of his skull, and Cloud choked on dirt and grass.

Growling, Sephiroth warned, “If you scream out like that again, Cloud, I’ll slit your throat.”

Eyeing the Masamune gleaming at himself beneath the stars and moon, Cloud’s crying died down to a muffled whimper. He didn’t want to test Sephiroth, and he only nodded, timorous and meek as always.

This wasn’t fair…this wasn’t fair, at all. He’d planned everything perfectly with Zack, and now, Sephiroth was going to strip him of his happiness and peace in an instant.

“Good boy,” Sephiroth purred, nuzzling to the side more of Cloud’s soaked hair. Pressing his nose right against the omega’s neck, he inhaled deeply, holding onto the scent in his lungs for a few seconds. Growling possessively as he exhaled, the dominant alpha licked and lapped away at the tender flesh, teeth scraping over the first layer he was intending to break and bear down on, soon.

Everything was crashing and spiraling in Cloud’s life. Smothered between the ground and Sephiroth’s toned form, he knew he had no place to go, no one to cry out, for, and no one would be here to help him. He was truly defeated, he’d truly fallen, and he was at Sephiroth’s complete mercy. The alpha could do with him whatever he pleased…

Remembering Zack’s warm smiles and welcoming arms, Cloud held his breath, shut his eyes, and braced himself once he felt sharp teeth grazing along his neck, leaning more towards the left side. His blood pumped thickly in his veins, his life source crying out weakly against the command of this powerful creature.

Without warning, Sephiroth hissed, and his teeth finally sank into Cloud’s neck. Kicking and screaming, the young omega’s cries of pain reverberated all across the forest. Birds and other woodland animals ran about in fear, hiding and silencing as they listened to his terror-stricken, piercing screaming. Those screams had no end to them, for there was no end to Cloud’s suffering, so it seemed.

Unable to do anything but shout through this unholy union, Cloud felt his throat turning hot and dry, more parched than the damn desert. Sephiroth’s saliva was toxic, and it paralyzed him within seconds. His heartbeat slowed down, his muscles grew lax, and even his blood pumped slower all across his body. His temperature rose and fell, he felt sick to his stomach, his head spun rapidly, and he saw darkness even though his eyes were wide open.

Now, Cloud knew he was bound to this monster, and there wasn’t a damn thing he could do to alter and deny this despicable fact. Only alphas were able to break a pair bond, and he wasn’t going to begin asking Sephiroth to release him. The answers were unspoken and clearly laid bare, anyway.

As soon as the alpha’s teeth retracted, Cloud’s head flopped forward, and he collapsed into the cool grass again like a damn puppet cut off its strings.

Drawing back, Sephiroth licked his lips, collecting more blood and saliva on his fingers, then sucking and licking them deeply into his mouth while he stared at Cloud hungrily and greedily.

Once it’d all been done, and once Cloud’s unfortunate fate had been sealed by his own hand, Sephiroth grinned evilly, at the peak of his enjoyment over another person’s suffering and discomfort.

Eating it all up like a starved beast, he laughed a foul, bile laugh at Cloud’s expense.

“Now, you’re mine, Cloud, and I assure you, I have no intention of letting you go.”