Vulkan Loses [it]
gn!omega reader x alpha vulkan
Cw: nsfw, abo dynamics, reader is a BRAT, don't be fooled by the plot at the beginning this is the story of how he uses your entire body as a cocksleeve
The cavernous obsidian corridors beneath Mount Deathfire were never truly silent, as there was always the distant echo of sound waves converging on this sacred point. Far below, distant forges growled like sleeping beasts as they drank the geothermal energy of the planet's core while the stone itself seemed to breathe with latent heat.
You walked alone, deliberately choosing this isolated path after the latest council meeting where you had once again publicly challenged the ancient Nocturnean bonding rite.
Alphas and omegas... to evaluate this dynamic through a strictly clinical lens is to recognize a species-wide epidemic disguised as sociology. The traditional patriarchal narratives surrounding secondary genders are self-capitulating myths designed to rationalize a profound disruption in human protein expression.
Statistically, a spontaneous genetic aberration of this magnitude should have plateaued or resulted in a population bottleneck due to the sheer metabolic cost. The fact that these phenotypes not only persist but maintain an aggressively stable equilibrium within the global gene pool suggests a powerful vector of unnatural transmission.
The most telling aspect, however, is the sheer structural precision of the dual-glandular pheromonal pathways and synchronized estrus cycles. It bears the unmistakable hallmark of the Master of Mankind’s genetic handiwork.
You theorized the entire species-population was an active test bed, an isolated crucible where He engineered a viral vector to achieve permanent germline integration. The hyper-endocrine states and rigid physiological stratification aren’t random, they are a highly calculated experiment in hardcoded compliance, utilizing a syn—
The civilized thought was violently torn away, swallowed whole by the sudden, red-hot roar of your hindbrain.
You didn't decide to move, the reptilian core of your nervous system took total control of your flesh before your conscious mind could even begin to ask why. Your fingers ripped into the hilt of your dagger as your spine instantly locked into a defensive coil, mid-step.
Only then did the air reach your lungs before it quickly died, curdling into something thick and sticky in your lungs, like wet wool.
A crushing pressure slammed into your chest—an alpha presence so violently absolute it made the hair on your flesh stand on end. The catecholamine rush was palpable as it dumped through your veins. Your omega instincts screamed at you to run, to bare your neck, to present like good prey.
You crushed the urge viciously and kept walking at the same measured pace, hand still heavy on the pommel of the blade.
Heavy footsteps echoed behind you. Deliberately. Each one vibrated straight through the stone floor.
You stopped, turned, and faced him.
Vulkan stood at the far end of the corridor, silhouetted by the faint magma-glow of the chamber behind him. He was immense. Even from 50-yards away, the sheer scale of him stole breath from your lungs.
Wearing only a loin cloth and bare from the waist up after long hours at the anvil, his obsidian skin glimmered with sweat. Every breath he took made the thick slabs of muscle across his chest and shoulders shift like living armor.
He didn’t speak at first. He simply stared.
You felt the crimson gaze drag over your body like a physical touch. Your heart hammered so hard you were certain he could hear it. Fear, electric and exhilarating, flooded all five of your senses. This was no mortal alpha. This was Vulkan. The strongest of the Primarchs. A living volcano. One wrong move and he could end you without even meaning to.
So you lifted your chin and gave him your coldest, most defiant smile.
“Following me now, Lord Vulkan?” Your voice echoed cleanly off the stone. “How very undignified for a Primarch.”
He took one step forward. Then another. The temperature in the corridor rose noticeably.
“I have been patient,” he rumbled, voice low and tectonic. “I have given you every opportunity to accept the old rites with dignity. Instead you mock them. No, you mock me. In public.”
You let out a low scoff, and took a step toward him instead of away. “Because they are archaic barbarism dressed up as tradition. And you…” You let your gaze rake deliberately over his colossal frame. “You keep pretending you’re above them while your scent betrays you every time I’m near.”
Vulkan’s jaw flexed. A muscle ticked in his thick neck. He took another step, now close enough that the heat rolling off his body washed over you like an open fire-pit. His scent continued to bombard you in waves, mutating the longer you stood in his space.
The initial strike was pure Nocturne, carrying dry static notes of scorched stone. But as his heat bled into the air between you, the scent bled with it, thickening into the rich tang of molten metal before finally giving way to its true, dominant core.
And it didn't stop. It continued to unravel into a heavy, dark alpha musk so dense you felt it on your tongue. Your thighs clenched involuntarily as a rush of slick threatened to spill.
Don’t show it. Don’t you dare show it.
“I am trying to be better than the old ways,” he said, almost to himself. His massive hands flexed at his sides. “I have died and returned for the sake of humanity. I will not become a slave to base instinct… not even for an omega who taunts me at every turn.”
You stepped even closer, now within arm’s reach, and looked up at him with open challenge. The top of your head barely reached the bottom of his abdomen. The size difference was dizzying.
“Then maybe you’re not as strong as they say,” you whispered, voice laced with venom. “Maybe the great Vulkan is terrified that if he touches me, the noble mask will crack and everyone will see exactly what kind of alpha you really are underneath.”
For three long, agonizing double-heartbeats, nothing happened.
Vulkan’s flaming eyes bored into yours, dilating until the deep black of his pupils swallowed his stare entirely. His massive frame seemed to swell, his chest heaving with deep, ragged drafts of air that left his lips parted, baring the white line of his teeth.
You watched the noble protector war with the ancient drake inside him, watching his civil facade fracture from the inside out. A violent tremor rippled through his massive shoulders as the dense musculature of his upper body locked down. Deep within the meat of his chest, a telluric rumble took root.
Then you twisted the knife:
“Or maybe you’re just too weak to take what you want.”
The snap was instantaneous.
A savage roar tore out of him as centuries of control shattered. One enormous hand seized your waist and lifted you clean off the floor as if you weighed nothing. Your back slammed against the warm stone wall hard enough to knock the breath from your lungs.
“Enough,” he snarled, voice no longer human.
You locked every muscle in your face, refusing to let the spike of raw panic show. Instead, you glared straight into his molten red eyes and sneered.
“I’m not scared of y—”
He cut you off with a brutal motion. His other hand ripped your remaining clothes away in one savage tear. The stale air kissed your bare skin for only a millisecond before the incandescent heat of his body engulfed you.
Vulkan curled you upward with terrifying strength, folding your body almost in half against the wall. Your thighs were wrenched wide around his waist before he crushed them together, trapping the searing, impossibly thick length of his cock between them. The underside of his massive shaft nestled perfectly into the cleft of your ass, dragging over your perineum and forward through the tight, slick channel of your pressed thighs. The burning head slid all the way up your soft belly, smearing your own traitorous omega slick and his heavy pre-cum across your skin.
A broken groan tore out of him.
No. No—no—no. This is wrong. They are my mortal. My duty is to protect—
The noble thoughts were immediately obliterated, swallowed whole as the alpha drive ruptured from the deepest trenches of his mind like a hydrothermal vent fracturing the seabed.
Omega. Defiant. Mine. Breed. Claim what the fire has given you.
“I should not do this,” Vulkan snarled aloud, voice wrecked. His forehead dropped against the stone beside your head as his hips rolled in a slow, devastating thrust. The entire calid length of his cock dragged through the tight sleeve of your thighs and ass, the heavy head gliding well past your sternum. “I am Vulkan. I endured death itself. I am not… I will not become this.”
Yet he didn’t stop.
He clamped your thighs even tighter around his girth with one enormous hand, the other sliding down your lower back to cant your hips upwards, keeping you perfectly folded and helpless, feet dangling uselessly in the air. Every powerful stroke ground him from the cleft of your ass all the way up your stomach into your ribs — he was using your entire lower body like a living toy.
A sick, shameful heat detonated deep in your gut, tangling violently with your terror. He was too fucking big. Your mind convulsed at the sheer physics of it. If he shoved himself inside you here, right now, he would stretch you to the point of tearing.
He would have to split your anatomy open just to make room for his mass.
There was nowhere inside your flesh for your organs to retreat; he would fill you until you choked on him.
The musk pouring off his skin continued to hit the deepest parts of your brain, turning your vision glassy as your lower body betrayed you completely, weeping another shiny, pathetic stream of moisture that slicked between the both of you.
You dug your nails into his thighs hard enough to draw glowing orange blood and hissed, “Then stop pretending to be noble and just rut me like the beast you are, my lord.”
Vulkan’s entire body shuddered. A savage growl ripped out of his chest as the last chains of his restraint snapped.
“Damn you,” he snarled, hips suddenly slamming forward harder. “Damn you for making me want this.”
His rhythm turned brutal. He rutted against your curled-up body with renewed, barely controlled power.
“I swore... to be the protector,” he choked out, his flaming eyes burning down into yours as he delivered a massive, hip-snapping thrust right between your knees, the sheer girth of him stretching the skin of your thighs. “I swore... to hold the line... against the monster.”
He rocked back, the dark obsidian of his knuckles tautening into smooth, glossy glass as his grip locked like a hydraulic, forcing himself to stay back, to not breach the tight, weeping heat waiting just below him. Then he drove forward once more in a desperate, friction-heavy strike.
“But you—”
He ground hard against your slicked thighs.
“—You are the catalyst.”
Another heavy, breathless slide.
“You smell of the sacred flame.” He hammered against your closed legs, picking up the pace, his breathing a scorched hiss. “So narrow... so slick... yet you dare... look at me... with war in your eyes.”
Another heavy, unyielding plunge buried him into your soft flesh.
“You’re mine.”
His grip tightened, crushing your thighs somehow even harder around his throbbing length as he lost himself in the sensation of you. The searing heat of his cock was almost unbearable, every vein and ridge dragging over your most sensitive places with relentless friction.
Inside his mind the war still raged, even as his body betrayed him:
They are not livestock. They are a person. They loathe this tradition—
They are dripping all over my cock. Their omega body was made for an alpha this strong. Push inside. Knot them. Fill them until they break.
Vulkan’s breathing was ragged now, deep growls punctuating every savage grind.
He pressed his forehead harder against the stone, trembling with the last remnants of resistance.
“Tell me to stop,” he snarled, voice desperate and broken even as his hips kept ruthlessly using you. “Tell me now, little omega… before I lose what remains of my honor and take you completely.”
His thrusts grew more violent, the wet slap of skin against skin filled the vaulted hall as the noble Primarch fought, and failed, to hold back the beast within.
A guttural roar tore from his chest as he rutted against you with savage abandon. His colossal hips slammed forward with enough power to jolt your entire body against the wall.
And you... your body had stopped processing sensation correctly.
Heat blurred into pressure. Pressure dissolved into instinct. Somewhere beneath the suffocating flood of pheromones and friction, your higher reasoning was beginning to fragment at the edges.
You understood with sudden horror why omegas submitted.
Not weakness.
Exhaustion.
“Emperor's blood—” he snarled, voice completely wrecked, deep and guttural. “I can feel your hole winking against my cock, greedy little ember. Sucking on me every time I thrust.”
He folded you even tighter, knees nearly at your shoulders, your body bent in half like scrap metal under a hammer. One massive hand twisted your thighs together so tightly around his girth that the pressure made his cock bulge obscenely between them. The other hand slid down the hiked curve of your spine, over your hip, until it engulfed the entire length of your thigh, lingering only to radiate heat throughout your entire core before indulgently pressing his thumb into the sensitive cleft above your hamstrings. Dangerously close to the tight ring of muscle below. He grabbed a whole palmful of the generous flesh and began kneading. His grip was so massive you rocked with every grope as he found new ways to mold your cheeks around him further. He couldn't help but admire the way the fat and muscle spilled out from between his fingers while the rest of your entire lower body was used as his righteous cocksleeve.
Schlap. Schlap. Schlap.
Mind breaking sounds filled the corridor as he rutted like a feral drake in full heat. His massive cock pistoned between your pressed thighs and ass, the heavy shaft grinding roughly through the tight channel he forged. Your slick was pouring out of you now, flooding down his length, coating his balls, and dripping in thick rivulets onto the stone floor.
Your eyes wavered. Vision blurring at the edges from the overwhelming sensation and scent pouring off him.
You could barely think anymore.
Your own omega signature flooded the subterranean air in sweltering waves. It was sweet and heavy with ash. Vulkan inhaled it like a dying man and lost what little sanity he had left.
“Throne— yes,” he snarled, nostrils flaring, crimson eyes wild and glazed. “That’s it. Flood the corridor with your scent. Drown me in it. You hate it, don’t you? Hate how wet your greedy hole is for your Primarch’s cock. Hate how good it feels when I use you like this.”
His cock throbbed violently between your thighs, the ridges catching and dragging against your raw nerves with every frenzied stroke.
“I should be ashamed,” he growled, voice cracking into something unhinged. “I should be on my knees begging your forgiveness… but I can’t stop. You feel too good... Do you understand what you are doing to me?” Vulkan rasped. “I have held dying worlds together with steadier hands than these.”
Another brutal grind. His balls, heavy and tight, slapped against your back with wet, meaty sounds. Sweat rolled down his obsidian chest and dripped onto your skin, mixing with the mess between you.
Your scent kept pouring out stronger with every thrust. You hated it. You hated how helpless and aroused it made you feel.
Vulkan fucking loved it.
He buried his face against the side of your neck, inhaling greedily, tongue scorching then laving over your pulse as he kept rutting like a madman. “More,” he snarled against your skin. “Give me more of that scent. I want the entire mountain to smell how badly you need my cock. How badly you need to be fucked raw and knotted until you can’t even remember your own name—”
His rhythm turned erratic, desperate, hips snapping with terrifying strength, muscles flexing and bulging as he fought the final urge to impale you.
“Do you know what Nocturne teaches its sons?” Vulkan murmured against your throat. The sudden calmness in his voice made your pulse stutter.
“Control is the only thing that separates strength from cruelty.”
His hips jerked violently against you.
“And I am losing it.”
Vulkan’s voice dropped into a dark, pleading growl right against your ear:
“Tell me to stop, little flame… or spread your legs wider and beg your Primarch to ruin you properly. Because I’m so close to saying fuck my oaths and forcing every last inch inside you.”
The stone behind you cracked.
A hairline fracture split through the obsidian wall beside your head from the force of his restraint alone.
Vulkan froze when he saw it.
For the first time since he touched you, genuine horror crossed his face.
“Emperor…” he breathed, realizing another inch of lost control would have killed you.
His massive body trembled with the effort of holding back that final line, unable to fully stop himself from grinding against your soaked flesh.
You hardly noticed.
Because you were breaking.
The relentless drag of his monstrous cock between your thighs, the burning texture of every gene-forged ridge, the obscene sounds, and the suffocating alpha scent were tearing you apart. Tears of overwhelming sensation and humiliated arousal stung at the corners of your eyes, but you refused to let them fall. You refused to break so easily.
You hated how good it felt.
You hated yourself more for what you did next.
With a shaky, furious breath you wrenched your hips up even more, practically inviting the brutal slide of his cock even deeper into the cleft of your ass. The new angle made the shaft grind harder against your entrance on every pass.
You glared up at him through your lashes, voice raw but still laced with venom.
“Is this the legendary fire of Nocturne?” you spat, voice cracking as another heavy thrust dragged every textured inch across your core. “The strongest of the Emperor’s sons reduced to grinding his cock between a mortal’s thighs like some desperate ash-whelp in heat? Pathetic.”
Vulkan’s pupil-blown eyes flashed with something wild and delighted. A dangerous chuckle rolled through his chest even as his hips slammed forward harder, folding you tighter.
“You vicious little ember,” he growled, voice like tectonic plates shifting. “Still spitting sparks while your body weeps molten slick down my shaft. Most omegas would be broken and babbling by now. But not you.”
He adjusted his leverage, burying his fingers deep into the soft tissue of your outer thighs until the tips bit against your femurs, gathering your lower body into a single, helpless cylinder. He leaned his entire transhuman bulk into you, bracing his forearm against the cracked stone above your head until you were pinned beneath the sweltering shelf of his chest. Every restrained roll of his hips carried the weight of carnal force barely contained beneath volcanic stone. The sheer intensity forced your traitorous body to weep slick just to protect your skin from being scorched raw by his transit.
You let out a choked moan that you tried to turn into a sneer. Tears finally slipped free.
“Keep pretending then,” you hissed, squeezing your thighs even tighter in open challenge, daring him. “Keep playing the noble forgemaster while you soak me in your pre-cum. We both know the truth, Vulkan. You’re terrified that if you actually push inside me, you’ll never want to leave. That this proud Primarch will become nothing more than a mindless breeding drake for one sharp-tongued mortal.”
Vulkan’s rhythm finally faltered for half a second. Then he snarled, and slammed his hips forward with restored savagery.
“Terrified?” he rasped, leaning down until his burning forehead nearly touched yours. His breath seared your cheeks. “No, little flame. I’m reveling. I have slain leviathans and walked through death’s own forge, yet nothing has ever tested my restraint like you.”
He pulled back only to ground the thick, ridged crown of his cock hard against your entrance, stretching the tight ring threateningly before dragging it back up between your thighs with a sodden sound.
“When I finally claim you,” he growled, voice dropping into some horrible and ancient register, “I will forge your body around me so completely the mountain will remember your screams. I will stretch that tight, stubborn hole until it molds to the shape of my cock alone. You’ll feel empty for weeks afterward… aching for the only alpha strong enough to fill you.”
His thrusts grew faster, more erratic, the blistering heat of his shaft rubbing you raw in the most exquisite way. Your defiant tears kept falling, but your gaze stayed locked on him.
Vulkan’s eyes burned with wild joy as he watched you fight to hide how badly you needed him.
“Keep fighting me,” he snarled, lips brushing your ear. His next words came even quieter, which somehow, frightened you more.
“You have no idea how long I have denied this.”
His hips stilled against you for the first time since he had pinned you to the wall. The sudden absence of motion felt almost unbearable.
“If I lose control completely…” The words emerged slowly, forced through the same pressure that kept volcanoes dormant. “Your body may not survive the claiming instinct.”
The confession hung between you in the heat-thick air.
Vulkan shut his eyes briefly, jaw tightening.
“And the most shameful part,” he admitted softly, “is that some part of me still wants to risk it.” His hand flexed against your thigh. He drew back and then pressed the swollen head of his cock against your entrance once more, holding it there with agonizing restraint.
“So go on then, little flame,” he murmured.
His burning gaze lifted to yours again.
“Insult me one more time… and see what your Primarch becomes.”
---------------to be continued?--------------
Tysm for reading (*´ω｀*) ... i am ridiculous.
A/n: Hello, more mean men are coming and mournival frat au enemies-to-something-else has eaten through my brain like a prion. School is so hard but im regressing so good. Silver linings?
Tagged: @incrediblethirst @druidwolf21 @thisuserislilsilly @iluminatka16 @nebulaegem @kit-williams @bispecsual @beckyninja @bookandyarndragon @jackalwolfsoul
SY OH MY GOD I DONT EVEN HAVE WORDS FOR HOW BADLY I NEEDED THIS FIC
