Archive of Our Own ^beta

Chapter Text

His dad explained it to him, in vague terms, when he first got his powers. He had gone from feeling incredible with his newly developed powers, to feeling like he had a violent, draining fever within the span of a few hours.

Nolan had spoken to him the morning after, during training, about Viltrumites all having second genders. That, when someone presents as an Alpha or an Omega, it always occurs immediately after their powers have developed.

What he had left out of that conversation with Mark, though, is that all fifty remaining Viltrumites in existence, excluding Mark, are Alphas. It hadn’t been their goal to wipe out all Omegas during the war, but because of their obvious weak spots, they had been some of the first to die. So, for over three hundred years, there hasn’t been a single Omega Viltrumite.

Until Mark.

Mark is still perceived as a relatively normal, human man on Earth. Humans don’t have secondary genders, they have no heightened senses to pick up on pheromones or detect heats or ruts. So, Mark has spent all of his heats alone. Every time he has had sex, which he can count on one hand, has been outside of his heats.

He prefers dating women, is more attracted to human women than to human men, but when his heat kicks in it is impossible to think about anything but being knotted. He has a very well loved knotted dildo he uses every month, and his heats barely last three days on average, so he’s right back to normal once they’re over. He’s had no issues with being an Omega thus far, though it can be an inconvenience to do his superhero work while he’s in heat.

Like right now, immediately after he just had to deal with Angstrom Levy’s bullshit and the alternate versions of himself. Which, unfortunately for Mark, set off his heat. Three of the variants he had been fighting were Alphas, including the Mohawk variant who embarrassingly teased Mark for being an Omega. Thankfully, that clip didn’t make the news clip cut.

But, a day after dealing with all of that nonsense and his body working on overdrive, practically begging for a mate, he’s face to face with a new enemy. Unfortunately for Mark, the first thing he notices about the guy isn’t even the way he looks. He can smell him flying closer and closer from miles away, can smell that deep, rich musk of a strong Alpha. And, god, it’s so much stronger than his dad’s smell or any of his own variant’s. It’s tart and thick and his mouth fills with drool before he can even turn around to look at him.

“Ready yourself for my arrival, worm!” The man announces loudly, coming to a stop mid-air just in front of Mark.

It takes less than a second after he’s spoken for the Viltrumite to pause, his arms lowering as an expression of pure shock settles onto his wrinkled, scarred face. It doesn’t help that, now that they’re finally face to face, Mark is only throbbing worse and worse between his legs at the sight of him and even more intense smell. He’s at least twice Mark’s size, maybe more than that. A perfect Alpha in every regard.

“An Omega? I thought we wiped them all out centuries ago…” He trails off, baffled as he slowly lowers himself to the ground. “And a virginal one at that.”

Mark feels his face burn in embarrassment, pressing his legs together in an effort to relieve the ache between them. He isn’t a virgin, he has had sex before, but only with women. He’s never been penetrated with anything other than fingers and toys. The knowledge than an Alpha can tell all of that from just a smell of him, though? That nearly has him leaking through his costume.

“I’m not-“ He’s cut off by a swift movement from the Alpha, pressing close and burying his nose in Mark’s neck, smelling his scent glands deeply. “Y-you… can’t take over the Earth…”

The man pulls away from him, giving Mark a wide-mouthed grin, showing off his jagged teeth. And god, those teeth could leave a perfect mating bite on his neck, too. He can’t help his instincts screaming at him to breed with him, but he doesn’t even know this guy’s name! He shakes himself out of his thoughts, opening his mouth to speak again before he’s cut off.

“I’m Conquest.” He answers for him before he has the chance to even ask. “You’re unmated, in heat, and you’ve never even been bred before. Do you really think you have the power to fight me right now?”

Mark frowns deeply. He may be incredibly horny right now, but he’s a hero for good reason. He does a good job, he saves lives, and he certainly isn’t going to just give up because of something as stupid as his baser instincts. He straightens up, ignoring the warmth pooling in his belly, ignoring the sweat gathering on his skin, and raises his head high.

“I would prefer if we didn’t fight, but I won’t let you claim this planet for the Viltrum empire. The people of Earth deserve to make their own decisions.” He speaks firmly, raising his arms defensively, preparing for another bloody fight.

Conquest doesn’t look threatened in the slightest. He seems pleased, even, smirking as he watches the challenge simmering in Mark’s dark brown gaze. His own eyes- one pure white, blinded, and the other a honeyed hazel colour- seem to burn with more arousal than before. He seems to like fighting a lot.

Before Mark can even process, Conquest is lunging forward and throwing punches at him, aiming straight for Mark’s face. He grunts in surprise, using his arms to block his heavy-fisted blows, returning the action with a few punches of his own, aimed lower at Conquest’s chest. A fist closes in on his face and he squeezes his eyes shut, clenching his jaw as the hit lands directly on his left eye, his skin already swelling and purpling from the force of the impact.

He hisses in pain, swiftly returning the blow with an uppercut, listening to the clack of Conquest’s teeth as his jaw is forced upwards. He grins as he sees red dribble out of the corner of his mouth, dripping down his chin before the older man spits out a tooth and more crimson blood. He meets Mark’s grin with his own, wiping his mouth with the back of his hand, panting before he winds back his hand again.

They fight for less than five minutes total, growing more violent as the seconds pass by, slamming each other into a few high rise buildings. By the time they’re flying into an empty apartment, glass shattered on the floor, a few pieces nestled into Mark’s back, they’ve both had enough of the tension. Mark lunges forward first, slamming Conquest down into a coffee table, the wood snapping under the man’s weight.

He keeps him pinned down, wiping some blood from his own nose as he straddles his lap. Just that contact between their bodies has him trembling from head to toe, immediately grinding his hips back and forth. Through their thin, tight layers of clothing, he can feel the size of Conquest’s hard cock, and nearly doubles over at the sudden rush of arousal. The fabric of his suit clings to his pussy, soaking wet and unbearably hot.

“Pretty thing.” The older man mutters in approval, bringing his hands up to rest on Mark’s hips. “I’ve waited for a mate like you for so long…”

Mark keens in approval, taking a moment to rip off what remains of his mask before he leans forward, bracing his hands on the man’s broad chest. A high-pitched, animalistic noise escapes his throat as he feels Conquest grabbing at the fabric between his legs, listening to the loud rip as it gives way. The cool air hits his hot, dripping cunt, and he squirms to press it against anything he can reach.

The older Viltrumite mercifully brings his large hands down to his own suit, ripping the white fabric from his body and exposing his hard length. Mark takes a moment to admire it, his insides clenching around nothing. It’s the size of his fucking forearm, and then some. It’s thicker than a soda can, and entirely covered by his veiny foreskin, a shade of brown that doesn’t match the rest of his body, the thick swell of his knot at the base flushed red. Drool drips down Mark’s chin.

“I’ll be gentle when I push in, but after that, I can’t promise I’ll be able to resist.” Conquest warns, hooking his thumbs into Mark’s folds, spreading his pussy open for a better view. “It’s been a millennium since I’ve done this.”

Mark’s swollen t-dick throbs at the knowledge that he’s going to be his first in so, so long. The reminder of their age difference is also certainly having an effect on him. He spreads his legs a little wider, bracing himself as the feels the warm, fat tip drag between his labia, aiming for his hole. He shudders as he feels his own cunt give way, the first inch of the older man’s cock slipping inside of him without complaint. He’s so wet it takes him five more inches for his insides to start stretching around the girth uncomfortably.

He watches with keen interest as their bodies press together, his pussy struggling to accomodate for Conquest’s brutally large size. Mark rocks his hips back and forth in encouragement, allowing another two, three inches inside of him before it starts to burn again. He hisses in discomfort, grabbing at the fabric of Conquest’s costume as he slowly takes in the last few inches. Once he feels the swell of Conquest’s knot press against his folds, he knows he’s taken him as deep as he can manage for the time being.

“You’re already trembling.” He points out, watching Mark’s legs threatening to give out. “Let me take over, hm?”

Mark isn’t given a second to respond before he’s being pushed onto the couch beside them and his knees are bent into his chest. Conquest, true to his word, immediately loses himself in the pleasure of their interlocked bodies, his pace beginning brutally and only growing faster and hitting deeper inside of him. Slick gushes out of him in approval, allowing himself to be violated deeper and deeper until Conquest’s cock is hitting the base of his cervix.

His inner Omega screams in ecstasy, moaning loudly with every thrust, every little movement of their bodies, just begging to be bred. He brings his trembling hands up to grab the older man’s shoulders, forcing their bodies closer together, dragging him further down until they’re face to face. He tips his head to the side in offering, his eyes already glossy and unfocused as he wordlessly begs to be bitten. He’s wanted an Alpha for so long, he needs one!

Conquest grunts at the sight, lowering his head, giving Mark a false sense of hope until their necks are pressing together instead. He rubs their scent glands together affectionately, the rich, tart smell of the Alpha mixing in with Mark’s softer, sweeter Omega scent. It’s an action he didn’t even know was possible, but his inner Omega leaves him drooling all over himself, cunt squelching wetly in utter ecstasy. He desperately wants something soft to rub their combined scent on to take home to his nest, aching to keep the Alpha with him at all times.

“Alpha!” He begs deliriously, moving to wrap his legs around the pure Viltrumite’s waist. “I-I want… want your knot!”

Conquest tenses, briefly, above him. For an agonising few seconds, Mark worries that he’ll stop their mating entirely and leave him to conquer the Earth anyway. Just the thought has a high whine escaping his throat. The sound seems to snap Conquest out of his own thoughts, though, and he thrusts into Mark’s dripping cunt with renewed vigour. The smell of their combined pheromones and the filthy musk of sex fills the empty apartment, clouding both of their minds even further.

“Little Omega…” The older man groans, his knot throbbing as it presses against Mark’s folds with every thrust, threatening to press inside. “Will you carry our pups?”

Mark throws his head back, his mouth hanging open in a silent cry of pleasure as his words tip him over the edge. His orgasm leaves his legs trembling as they lock even tighter around Conquest’s waist, his toes curling. He drags a shaking hand down between their bodies, rubbing his own t-dick through his climax as his insides pulse wetly. He gasps, grabbing desperately at Conquest’s bicep for stability as he’s pushed into a second orgasm, squirting messily onto Conquest’s rapidly swelling knot.

As his cunt throbs and tightens sporadically, his body convulsing and aching from head to toe, Conquest’s thrusts increase. He slams his cock into Mark’s cervix every thrust, sweat dripping down his body as he struggles to think of a way to make his knot fit. He forces his length in as deep as it can go, bruising Mark’s sensitive cervix as he slides his knot into his cunt, feeling it enlarge inside of him as he finally comes undone.

The moment Mark is knotted, his entire body goes limp, his eyes fluttering shut as he’s given exactly what he’s been yearning for for the last two years. He clenches purposefully around every inch of Conquest’s length, memorising it with as much detail as he can. He reaches up with shaking hands, grabbing at the back of Conquest’s neck and guiding him down again, tilting his head to the side. He can see tears blurring his own vision as he looks up at the Alpha.

“Please.” He begs, desperate to be mated after so many years of waiting, of feeling so hopelessly alone.

Conquest makes a soft sound, a gentle rumble as he leans in and presses a kiss to Mark’s scent gland. The affection in the simple gesture has his mind reeling, working on overdrive until it’s blissfully silenced. Sharp, jagged teeth sink into his skin, drawing blood as Conquest leaves a deep mating bite on Mark’s pale throat. The pain dissolves into pleasure, his body made for exactly this purpose, to be claimed and taken by a big, strong Alpha. He preens as the Viltrumite licks his wound, ensuring that it will stay for years to come.

Conquest purrs deep in his chest, content as he revels in his latest and greatest conquest. His sweet, half-human Omega.

Chapter Text

Announcing it to his family had been exceedingly difficult. Some clips of their fight and later fleeing the scene, which thankfully were all modest and innocent seeming, made it to the news before he could even make it home.

Conquest had flown him up to his room to get dressed, had even soothed his anxieties with affectionate nuzzles and kisses, and they flew back down to the front door together. Introducing Conquest to his mother was awkward, and to Oliver was at least five times as awkward. The kid had no filter, loudly asking why Mark was dating someone so old. Thankfully, Conquest found it funny, and he swiftly got the Alpha comfortable in their house.

A few weeks pass by, both men leaving the house and flying across the world for some privacy as they continue mating. Mark introduces Conquest to many human concepts, they visit a few romantic travel destinations for dates. Conquest despises his human disguise, loathes blending in with civilians, but puts up with it every so often to please his mate. It’s worth it for the seemingly endless hours of breeding afterwards.

Two months pass, Mark and Conquest settling into a routine, keeping their affections limited around others, and keeping each other satisfied in private. It’s all wonderful and giddy until Nolan comes home, his tail between his legs as he clearly aims to apologise to the entire family, and goes pale in the face when he sees Conquest. It was a horribly uncomfortable situation for all involved, especially Oliver who seemed outright overjoyed to see his father.

But, again, the family unit adapts. Nolan is allowed to come by to see Oliver every weekend, but has otherwise been banished from the family home. Everyone begins to settle into a new routine until Mark begins to get violently ill, and is rushed to see Cecil despite his growing anger towards the older man. He allows the invasive doctors to perform a checkup on him, and is baffled when one of the nurses tilts the ultrasound screen towards him, and he sees it.

Only seventeen days into his pregnancy, he can hardly see the two little beans that are his children on the stark black and white screen. He panics endlessly until he tells Conquest, who seems downright ecstatic as he stares at his ultrasound photos. The moment his fear of rejection is crushed, Mark’s inner Omega goes buck wild.

For the next three months, he stays home and simply preens. Debbie and Nolan aren’t pleased by the news, but once they see how happy the pregnancy is making him, they agree for Nolan to stay home and take care of him. Conquest covers for Mark during emergencies, which still happen far too frequently, and Mark is on cloud nine. Being doted on, nesting in his bedroom, being allowed to scent his entire family and just bask in their comfort- it’s wonderful.

Or, at least, it’s wonderful until he hits six months of pregnancy, and his ankles swell up like red and purple balloons. He’s so big with the twins that he’s effectively bed bound, only leaving his room for the bare necessities. Debbie offers him ointments and massages that helped her while she was pregnant with Mark, and he is endlessly grateful for her nurturing presence and comfort.

And as much as he loves his family, loves waking up to the smell of a full house, being fed and taken care of, the moment he can smell the house completely empty aside from him and Conquest, he is beyond relieved. He blinks open his eyes and reaches out for his mate beside him in bed, shaking him awake.

“Mm?” He grunts, peeling open an eye to check on Mark.

“I’m wet.” Mark responds bluntly, grinning as he watches his Alpha shoot upright in bed.

With his hormones going even crazier than usual, he’s been forced to quietly rub one out every single day, yearning for the kind of filthy mating that got him pregnant to begin with. And now, with them alone in the house together, he can finally get the attention he’s been craving for months.

Conquest wastes no time in stripping them both down, leaning in to kiss his pregnant belly every few seconds, soothing their babies. Once they’re both undressed, he grabs a pillow and slides it under Mark’s back, ensuring that he’s comfortable before he even allows himself to look between his legs. His pussy is red and puffy, swollen and covered in dark hair. He hasn’t been able to reach down to shave in so long, and the sight has Conquest hardening rapidly.

He brings two fingers down between Mark’s folds, locating his swollen, flushed t-dick and stroking it between his knuckles. He continues the motion for less than a minute before Mark is reaching orgasm, as overly sensitive and pent-up as he is. He moans in relief as his thighs tremble, Omega slick dripping out of his hole and staining their bedsheets.

Conquest makes a deep rumbling sound in approval, settling between his mate’s legs and lining himself up with his warm, sloppy cunt. He slowly presses inside, reaching out to massage the fat of Mark’s love handles as their hips meet with a wet squelch. He shudders at the sensation, smiling softly as he stares down at his pregnant Omega. He can’t imagine a better view.

He begins to thrust slowly, setting a leisurely pace as Mark’s mouth hangs open, moan after moan escaping his parted lips. He looks heavenly like this, glowing with a sheen of sweat covering his heated skin, picturesque in his beauty. Mark’s hands settle on the swell of his belly, comforting the twins as his eyes flutter shut, basking in the pleasure of being mated.

The Omega tilts his head to the side, exposing the tan scar on his scent gland, his fully healed mating mark. Conquest has watched it day by day, watched as it scabbed over, as it changed from teeth-shaped divots to full, plush skin. It has faded some over time, and he chuffs as the urge to bite swells inside of him. He leans down and nuzzles at the spot, warning his mate with a low growl before his teeth sink in again.

Mark convulses in pure ecstasy as he’s claimed again so completely, his cunt tightening and gushing around his Alpha’s cock as he’s pushed through another orgasm. His mind goes blank, nails lightly scraping down the worn, scarred skin of Conquest’s back, needing him closer. He pants loudly as the Alpha refuses to seperate his teeth from his skin, continuing to bite as his thrusts aim deeper and deeper inside of him.

Conquest can’t let go. He can’t allow his precious Omega to be unclaimed, to let his mark fade by the time he gives birth. He wants every human they pass by to know that the children growing in Mark’s womb are his. A pleased grunt is pressed into Mark’s supple skin with every thrust, the wet smack of their bodies meeting filling the room, only growing louder as the seconds pass by.

Finally, he allows his teeth to slip out of the Omega’s marked neck, laving his tongue over the fresh wound as his thrusts turn rabid. The taste of sweet, metallic blood coats his tongue as he cleans the bite, his inner Alpha howling in pleasure at the knowledge that his mate has been so completely claimed. He wishes the other Viltrumites knew how valuable Omegas truly are, and hopes that they can produce a few Omegan pups to repopulate their species.

He hisses in relief as his knot begins to swell, slamming his hips flush against Mark’s as he finally reaches his own orgasm. He smooths his hands over Mark’s pregnant belly, feeling their children settle as Mark goes lax, so pleased to be knotted again that his feeling of relief spreads to the twins. A low purr rumbles through him as he holds Mark close, cuddling up to his mate as his knot keeps them connected.

“I missed this.” The Omega mutters, dragging his fingers through his mate’s hair.

“Once the twins are born, I’ll knot you every single day until you’re pregnant again.” He whispers, pressing warm kisses all over Mark’s neck.

Before he can trail kisses down to Mark’s collarbones, he stops him, cupping Conquest’s face in both hands. Their eyes meet and a warm feeling settles into his gut as he makes note of the redness coating Mark’s cheeks. He wants this so badly that Conquest wonders, distantly, how he got lucky enough to be the first Alpha to mate with him. His perfect, perfect mate, constantly yearning for him, openly yearning for more pups.

“Do you promise?” He asks, nearly pouting.

And how could he ever deny his mate anything?

“I promise.”