Loki is unpredictable. Always has been, always will be. He can be gone for weeks, even months at a time, and no one will see nor hear from him. He goes so far off the radar they can’t pick up a single reading on his magical signature. After so long — five years since the Manhattan Incident— everyone was used to it by now. The lack of disaster and loss of life meant that no one really minded giving him the freedom to come and go as he pleases. That seemed to keep him happy enough to prevent any more episodes.

The Avengers — most certainly the Avengers, SHIELD had taken more convincing — had come to an agreement with Asgard that Loki would take up permanent residence on Earth. His punishment had been most certainly been lenient, but all fully understood that he was not of his own mind when it came to the Chitauri attack, and no one was even remotely comfortable once they understood the torture he would be submitted too once he returned to Asgard. Maybe not from Odin himself, but the Allfather was not all seeing when it came to the treatment of prisoners in the dungeons. That was a fate no one deserved, and Loki had no wish to suffer. He was to aid them in battle, healing what and whom he could, working alongside them as an ally — and later, as a friend — to which he eagerly agreed, knowing he would suffer much worse back in his home realm.

Tony Stark doesn’t know what it is that alerts him to Loki's presence for the first time in three months after one of his lengthy escapades; it could have been the overhead announcement from Jarvis, or even more likely the assault from the unrecognisable, but delicious scent that hits his nostrils. His mouth begins salivating, the hairs on the back of his neck standing on end. He takes another deep breath in an attempt to control himself, but the instant rush of air to his lungs only has him revelling more in the unfamiliar heat more.

Bastard, he thinks sourly, Loki has an Omega with him. Tony was not best impressed. Both were ferociously protective of what they believed was theirs, and neither liked to share. Luckily for everyone, that damn Omega in particular, Tony was the only other Alpha besides Loki this high up in the tower to his knowledge. If Loki were as quick as he makes out to be, he’d be able to lock himself and the still unidentified Omega in one of the secure bedrooms, away from the other’s advances that would come sooner rather than later if the scent didn’t soon dissipate. Tony has more self-control than his reputation would suggest, but in this smothering heat he has only the next half an hour before his instincts fully take hold, and he would be forced to do something about it.

Time ticks by slowly, painfully slow if you ask Tony. With every passing second, the deep scent fills the air stronger than before, a shiver runs through his body involuntarily. His fingers stutter and he shakes his head, trying to block out his base instincts and focus on the tablet in front of him, tweaking his designs for the new Starkjet — Tony does like creating new technology that shames that of S.H.I.E.L.D. Seeing Fury’s only eye twitch in that special way reserved only for Tony's bullshit is the highlight of his day. He fights his urges for as long as possible, before it punches him in the gut and becomes too overpowering to ignore.

Opening the door to his room lets in a new rolling wave of scent, dangerously hitting him like a freight train. He ventures carefully along the corridor towards the living room, the scent becoming more and more potent with each hesitant step. On his journey, he enquires as to the location of the other Avenger’s with Jarvis. The ripe Omega lurking somewhere within the residential floors has the potential to start an all-out Alpha battle, and Tony needs to know how prepared to be. With a scent like that, and an especially stubborn attitude in general, Tony will not be backing down.

“Jarvis, location of the Avengers, including all known Alpha’s. Stat.” Tony grits through his teeth.

"Thor is in New Mexico. Steve Rogers and Bruce Banner are at S.H.I.E.L.D HQ, with Director Fury. Agents Barton and Romanoff are on a mission: location undisclosed. Colonel Rhodes is away on business." Jarvis dutifully responds.

Thank God. The last thing Tony needs right now is a fight. The raging hard on he has confined in his jeans would be even more painful in his Iron Man suit and there is no way he could beat either Thor or Captain Spangles in hand to hand combat. Not to mention Cap’s shield and Mjolnir. He’d like to think he could beat Rhodey in a fight, but that’s probably wishful thinking too.

“What about other associated Omegas?” The only explanation his fogged brain can formulate for what he’s feeling is that this heat is far too strong for just one Omega. He’s worried that others may have been pulled into their own heat unscheduled. That in itself is a pain in the ass, especially for an unmated Alpha in a tower full of claimed Omegas.

"Sir, no permitted Omegas, including Miss Potts, Miss Foster and Agents Coulson and Hill, are within the building." Tony let’s out the breath he was holding. He doesn’t know whether to panic or not: this heat was from one Omega. It’s like nothing he has never felt before, he didn’t realise a heat could hit this strong. He felt sorry for the poor Omega suffering through this, and just hoped that Loki was there to take care of this properly and with some moral decorum.

Slowly, but surely, Tony eventually reaches the living room with little grace, falling over his feet. He stares around the room to nothing. He sees no one. Nothing. Absolute jack-shit. It makes no sense! The heat though — Tony takes another deep intake of air, trying to breathe through the sensation — the heat continues to viciously engulf the Iron Man. In the near distance, the noise is quiet, but his newly hypersensitive hearing picks it up instantly.

Pained whimpers and desperate moans begin to infiltrate his ears. Tony inches further forward, a familiar scent of mint and ice gets stronger and stronger, the two mingling in the air together, the heat overwhelming him even more. He rounds the sofa hesitantly, shocked at whom he finds writhing against the floor.

Curled in on his side in head to toe leather, his knees are pulled tightly to his chest. His heavy, green cape is wrapped around him, trying to protect himself from anything that may wish to cause him harm. His shoulders violently shake, and he sobs helplessly. He's rattled, never had Tony seen anyone so vulnerable in his entire existence. The long strands of onyx hair, slick to pale skin with sweat, distort his face, but Tony knows exactly who it is.

Loki.

Tony’s entire body screams at him to take Loki there and then, mark him, claim him hard and fast against the cold, marble floor. But there is something stopping him — maybe it’s his brain, possibly, maybe it’s his heart, sentimental nonsense, he doesn’t know — but he does know he shouldn’t take advantage of Loki like this. He's better than that. Better than rape. Something about the whole situation has Tony defying an entire lifetime of natural instincts to mate. His need to protect the defenceless Omega in front of him, somehow manages to outweigh his need to ravage Loki's body.

Loki senses the Alpha’s presence behind him, and looks over his shoulder. His large, green eyes betray how truly terrified he is, but simultaneously show his desperation for Tony to claim him. Tony visibly shudders in anticipation. Kneeling down beside the God, Tony’s hand tentatively touches his face, his fingers softly running through his hair. Loki groans in pleasure at the skin-to-skin contact and rolls over, his back arching into the touch. His body is on fire and the touch quells the raging burn, relieving him for a few brief seconds.

“Bambi,” Tony sighs deeply, “What happened?”

Everyone, even Thor, believed Loki to be Alpha, they knew no different. There were absolutely no submissive signs, hell he packed a punch like no other Alpha Tony had encountered. Training with the guy was just as painful as training with Thor. The guy couldn't back down in any situation whether it's a battle of muscle or mind. Unfortunately for Tony, Loki's mind is far too deep into this heat to answer coherently. He struggles to breathe out a few words explaining to the best of his current ability what happened, “Doom. Caught me… unprepared.”

That bastard. It's now that Tony understands what has happened, for the most part at least. He's still assuming a lot, since he has little to go on, but y’know: genius. But what he does know comes from rumours — mostly intel that S.H.I.E.L.D had procured from the Fantastic’s — flying around recently that Doom has been creating spells that turn Alphas and sometimes Betas into Omegas, in hope of creating himself the perfect mate. Who better than the God of Mischief himself, Loki of Asgard?

“Doom hit you with an Omega altering, heat inducing spell.” Tony surmises and Loki nods stiffly. It's the only explanation they have right now, so they know what they have to do: treat Loki like he really is an Omega. The effects will eventually wear off, it’s a certainty in their minds. Doom really is the most inconsistent "sorcerer" Loki has ever encountered in his long life of travelling across the universe throughout the Nine Realms.

“Tony, please,” Loki begins begging, hoping, pleading that the Alpha will finally shut up and take him already. “I—I need you!”

“Loki, seriously think about this. If this heat wasn’t clouding your mind, you wouldn’t want this.” He knows he’s fighting a losing battle with Loki pawing at both their clothes, trying to rid their bodies of the confinement. “You’ll regret this later, just think about it!”

“Shut up and fuck me, Stark!” He makes a noise partway between growling and whining, and it is quite unbecoming for a Prince of his stature. His voice breaks as he pleads, “Help me.”

Loki hates himself in this moment, he doesn’t understand. He doesn’t know how or why, but there is a complete absence of any uncomfortable, sickening feeling deep in the pit of his stomach, one that he was sure should be there. Never before had Loki ever considered submitting to another man, an Alpha. New, terrifying territory isn’t so scary with Tony helping him through. A surge of something else other than lust rips through his body, tearing him apart from inside out. Gratitude, appreciation, love? Is it love perhaps? But love is for children… and mated Alpha/Omega bonds. Neither of which applies to this situation. Loki's sub-conscious rationalises whatever that blasted feeling is to wanting to find the best Alpha possible to mate with since he is, for all intents and purposes, an Omega and what that entails. That is surely all it is. There is no way he could actually be in love with Tony Stark... Genius, billionaire, playboy, philanthropist, with a suffocating aura of arrogance and an ego to match. But Loki was an Alpha himself. There was no possible way for him to be in love with another Alpha.

“If we do this—” Tony earns a stern look from the man below him, before correcting himself, “Fine. When we do this… You gotta give me the reins, big boy. I want to do this right. Let me take care of you. Can’t have your first, and hopefully only, Omega experience sucking now, can we?”

Right about now, Loki is so damn horny, he would agree to just about anything. He may be sick to death of the incessant worrying — and on one of his better days, the engineer would have been punished for that — he was glad to be stuck in this position with Tony Stark, of all people. He would never have pegged the infamous playboy for such an attentive and considerate lover.

He can’t bear to imagine what would have become of him if he was stuck with one of the other’s. Not only are they all bonded (with the exception of Tony) to another, he can’t stand to be with them for more than a few months at a time. Why else do you think he goes off on one of his jolly holidays? They annoy him. Luckily for him, Tony has always been different. It takes him no time to nod eagerly in agreement, and sighs in relief when the playboy nods too. Okay, this is happening.

As Tony goes to help Loki from the floor so he can move the God to his secure bedroom, a ripple of painful pleasure courses through him with the extra contact, rendering him completely and utterly immobile. He can’t bring himself to shift his weight to sit up, let alone stand, Loki instead he clings to Tony, his arms thrown around his neck and his legs wrapped around his waist in a death grip.

Making the best of a bad situation, Tony lifts Loki slowly and steadily, not wanting to lose his balance and drop him. That would be a great way to start the experience. The trickster is surprisingly lighter than expected, so not too much unnecessary effort is exerted. Tony carries him to his room in the same position — Loki clinging to his chest — and initiates Lockdown on the entire floor. No one is going to interrupt Tony as he works his magic. And by magic, he means his ability to find that special spot to make any Omega see stars within minutes. He really doesn’t need, or want, any other Alpha sniffing out Loki in this state. Loki is his, and he'll be damned if anyone else tries to put their filthy paws on his pale beauty.

In haste (thanks to Tony’s record speed), they reach the bedroom, heavy door swinging shut automatically behind them. There is the audible clink of metal as the industrial strength lock secures in place at Tony’s command. Shifting the weight of the God in his arms, Tony unloosens the emerald cape from lean shoulders and it drops to the floor haphazardly, uncaring as to where it lands. It’s not of importance.

With the obstructive excess of heavy material now gone, Tony lays Loki on the bed, his head being swallowed by the feathered pillows. Watching Loki pant breathlessly, body thrashing against the mattress, Tony can’t help but take pity on him. He doesn’t waste time teasing, torturing him any further. It’s cruel to prolong the first coupling for a normal Omega, let alone one going into heat for the first time. He can’t even begin to imagine about what is going through Loki’s mind and body right now.

Nimble fingers work quickly and attentively to undress Loki, but struggle momentarily with the clips and buckles that hold the shoulder armour plates in place. Once he finally rids Loki of the golden metal, he sits him up and pulls his tunic fashioned from soft Asgardian cloth over the slender shoulders and his head, throwing everything to the floor. Next Tony removes the leather boots, pulling them off with little resistance. The skintight leather bottoms take a lot longer to get off, the unforgiving material sticking to the sweat-slicked legs. He's seen Loki change his attire a lot quicker with magic, but that seems to have been dampened by whatever the fuck this is.

When Tony goes to stands up from the bed, Loki reaches forward to grab him, whining when he misses and loses the crucial contact that has been keeping things a little bit more bearable. The sob that escapes Loki's pretty red lips has Tony stripping his own clothes faster than he ever has before, desperate to please the trickster. With his jeans and underwear gone, Tony finds his own cock straining and pulsating hard, but ignores himself for now and returns his attention to the beautiful sight before him.

Returning to the bed hastily, Loki’s legs are spread wide and welcoming allowing Tony to kneel as close as physically possible. He drapes himself over the expanse of creamy, white skin, revelling in the pink blush staining his chest rising to his high cheekbones. His tongue darts out, brushing the other’s lips, pulling away ever so slightly, leaving Loki’s eyes fluttering and lips parting. Tony presses forward, hands encasing either side of the God’s head, as his tongue finally breaches Loki’s lips, kissing him deeply. Their tongues dance, massaging each other, exploring, tasting every inch of the unfamiliar mouth. Tony hums and Loki groans into the other. The trickster gasps, head falling back against the pillows as Tony’s talented tongue works it's magic licking, lightly nipping and kissing the burning skin pulled tightly over the torso and stomach contorting against the mattress. He positively worships the stunning creature beneath him.

More forcefully than his previous actions, ramping up the pace, the pleasure, both hearts beating faster, Tony flips Loki over onto his hands and knees, his own hands supporting the trickster's hips to keep him upright. The God is already impossibly wet and gaping open, Tony sits back to marvel at the weeping hole presented before him. Dragging his nails over the shoulders, along the back, racking over the tight arse cheeks, Tony kisses up the inside of Loki's thighs, lapping up any of the fluid dripping down his gleaming legs as he goes. Using both his hands to spread his cheeks apart, Tony licks at the puckered opening, teasing it with his well-practiced tongue, working to loosen the muscle. Loki squirms at the unfamiliar sensation but relishes it, dropping forward onto the forearms, knees pushing further apart, hips grinding into thin air to find some much needed friction.

Taking the next step, Tony uses his fingers to dip inside, stretching him further and wider, the muscle finally relaxing at his touch. Loki bucks back onto the fingers inside him, pushing them deeper, begging for something harder, thicker, longer, something more. He’s now past uncomfortable and into the Oh Gods fuck me harder stage of proceedings. However Tony is nothing but a careful lover and knowing that Loki would never have done this before due to being Alpha prior to this experience, he is going to need this extra prepping for what is to come. A lot more.

“Tony, ah! More, I need more, p-please!” His usually silky voice grows more and more distressed and muffled as he buries his face into the pillow with each thrust of the playboy’s proficient, masculine fingers.

More gently than before in aide of keeping him as perfectly open as he is, Tony rolls Loki onto his back again. Strangely, Tony’s ridiculous ego has the uncontrollable desire to watch the God’s face as he comes undone on his cock. Watching the bruised pink lips pant raggedly, he just has to taste them again. With their lips against each other again, Loki bucks upwards desperately needing more, but is disappointed when Tony slips off of his willing body to the bedside drawer for extra lube. He quickly slicks himself up and returns to the centre of the overly large bed.

He lifts one of Loki's deliciously long legs over his shoulder, stretching him open just that little bit more, thrusting in inch by inch, pushing to meet little resistance. He slips in and out a few times slowly, but never fully, easing Loki into it with care. Once buried to the hilt, he drops the leg from his shoulder, and Loki immediately wraps both of his lower extremities around Tony’s waist, pulling him as close as possible, throwing his head back and grinning at the heavenly stretch inside of him.

Dominating the God beneath him, Tony sets a hard and fast pace as he thrusts into Loki. The fog of desperation to reach completion quickly clouds both their minds, hips frantically snap back and forth, skin slapping against skin against the sound of shameless cries. Loki feels his body contort in ecstasy, pliant in the hands of the other man. His skin burns with each touch, his blood pulsating through his body, coursing through his veins at an uncontrollable rate.

With each thrust, desperately grinding, Loki bucks his hips to meet Tony, moving together as one. His body arches, jolting and shivering, the aching burn is almost unbearable. The overwhelming scent of pheromones being released is enough to have Loki squirming and leaking even more. Long, strong arms clutch tight around Tony’s neck, holding on as his body trembles, heat pooling in the pit of his stomach. Close, so close, mewling and moaning, as one final pounding of Tony’s hips sends him spiralling over the edge.

Still not finished himself, Tony flips Loki back to his knees and keeps thrusting until he feels himself coming undone, spasming and shuddering as his muscles tighten. An unfamiliar pressure builds up in the base of his cock, and before he can really take note of what is happening, he’s buried to the hilt inside Loki, coming harder than he ever had before. Another orgasm rips through Loki’s trembling body as the feeling of Tony’s seed fills him.

Loki drops forward, fully expecting to fall away from the others hold. He is exhausted and completely spent, almost desperate to lose the feeling of Tony's thick cock from his terribly oversensitive hole. As his face hits the pillows, he feels the Alpha's weight fall with him, the mortal groaning at the sudden movement.

"Tony, you can—oh Gods—I'm fine for now. Please..." Loki’s breath is laboured and broken, almost too embarrassed to voice what he really needs. Luckily for Loki, Tony understands. Unfortunately for the poor man, he won't get what he wants.

"I can't—" He bites back through gritted teeth.

"Can't? What do you—" Loki breath catches in his throat, groaning as he feels himself stretching even further, "You haven't..."

The intense pressure building at the base of his shaft is painful and every slight movement from Loki makes it worse, "Ah! Loki, stop moving—please!"

Loki does as he’s told and waits patiently, not wanting to cause the Alpha that has taken great care of him any unnecessary pain. Tony gently manoeuvres himself, so they are both lying on their sides. His arms wrap around Loki, pulling him close, as he softly moves his hips forward, thrusting deep and slowly to ease the pain to pleasure, pumping Loki full. Loki comes again, almost painfully pulsing and clenching around Tony’s knot. By the time Tony’s knot has finally deflated, they’ve both peaked through far too many orgasms to count, and both sigh as he slips out of Loki. The God falls flat on his stomach, Tony on his back.

“H-how have you knotted, you—you ridiculous man?!” Loki's lip curls, snarling dangerously as he turns his head, so the other man can see his disdain.

“Can we talk about this later — when you aren’t in the midst of this ridiculous heat?” The taste of the air, thick with Loki's heavy scent, has Tony’s body twitching, his breathing barely returning to normal.

“No! I want to talk about this now!” He feels tired and ragged, but he is terrified at what just happened. Tony wasn’t supposed to knot. They weren’t supposed to mate. Loki is only a temporary Omega, right?

Not only is Tony fully aware of what his knotting means, he also can’t make his sex-addled brain figure out why the fucking fuck it happened. He needs more time to recover, “Give me a few minutes to catch my breath, geez. Not everyone has the stamina of a God, your Majesty.”

Loki grunts his displeasure, but within ten minutes of silence and deep breathing, a new ripple of pleasured pain rips through him, his back arching into the mattress and teeth clenching, “T-Tony!”

“Seriously, already?” Tony head flies up from the pillow to stare in shock at Loki's insatiable appetite. Never has he experienced or heard of an Omega recovering and wanting more, so damn quickly. He should have been satisfied for at least an hour!

Tony doesn’t really have much time to question or complain, as his own cock begins twitching again. Loki's intoxicating scent covers his body, as the long pale legs straddle the mortal. Taking the playboy’s cock in hand, making quick work of hardening him again, before Loki carelessly lowers himself down, the familiar stretch extremely welcomed. With strong hands placed either side of the Arc Reactor, Loki rises and drops, testing the experimental sensation of riding Tony. Tony slides his hands up Loki's thighs to his hips, guiding the God up and down, thrusting to meet the still tight heat. It’s not long before Loki is riding Tony as hard and as fast as he can, like his life depends on it.

They both know that getting Loki through this heat was not going to be a short process, but neither really seemed to mind the prospect of fucking each other into oblivion. The only thing stopping them from fully letting go is the reminder of Tony’s thick knot pulsing inside Loki after their second stint, somehow mating them for life. How it was possible, they didn’t know, but right now... it didn’t really matter.

Notes

Comment, my darlings! Let me know your thoughts, I need as much feedback as possible, this is the first time I've attempted a story with Alpha/Beta/Omega dymamics. Plus, I've never written a story this explicit either, I'd love your thoughts on the smut side of this story too!