A/N – OK, this is quite a long one-shot, and my first attempt at Omegaverse! (Woo!) Hope you enjoy and apologies for...well, what's about to follow...

Author Update 3rd Aug '15 - Considering extending beyond a one-shot, but this update is just to correct some spelling/grammar errors.

There was pain writhing up from his stomach like serpents. Sweat dripped through his raven hair. He was on his knees, breathing heavily.

"Stay away!" he hissed, but it came out in a whine.

There was a mass of bodies around him – hot, sweaty Alphas clawing at his clothes and his flesh, scrambling over each other in their frenzy to force themselves on him. He didn't want it to be like this. Oh Norns, he was so fucking scared. He was going to die here...in a dark back alley on Midgard, just another Omega raped and murdered in heat.

Tears squeezed out of his eyes as his clothes were stripped from him. The shame of his erection and his wetness was bared to the night, and the sweaty crowd bayed like animals and fought each other more fiercely as the smell of his heat lured still more Alphas into the alley...

Tony woke in the night. The heat-smell was saturating the building. He staggered to the window, noting the line of Alphas stumbling from dark homes towards the same destination. Oh. Fuck.

This was bad. Some poor Omega in heat was calling every Alpha within a mile. Lots of Alphas in Manhattan. There was an insistent thud, thud, thud, at the door to his room.

"Coming Thor!" Tony yelled, slipping into his jeans.

He knew it was Thor. He was the only other Alpha in the building, and Betas didn't respond to heats. Of course, they were going to help, Tony sighed - just him and the Viking on an Omega-rescue mission. Fun.

He briefly considered waking Steve or Nat, the Betas currently in residence, but decided against it – that many aggressive Alphas after an Omega wouldn't be against pinning down and raping a Beta instead. Tony and Thor had one poor soul to rescue tonight – he wasn't going to add two more to the list. Besides (and this was the chauvinistic Alpha hormones talking) this was no place for a Beta; this was Alpha business. Stupid fucking assholes who couldn't keep it in their pants needed to be taught the correct way to be an Alpha.

Thud. Thud. Thud.

"On my way Thor!"

He'd kept them at bay so far. Some Alphas at the back were trying to stop the others, but there weren't enough of them to keep the lustful would-be rapists at bay. Blood dripped down his naked thigh where a surly Alpha had managed to get close enough to scratch, only to get a zap of magic to the face for his trouble. Loki was basically using his fingers as a taser, not strong enough in the throes of heat to give a wider blast of magic.

He was weakening, finding it more and more difficult to summon the strength for even the most basic of self-defence. His biology was against him, whispering to him to give up, let them take him. They were Alpha, he was Omega, he should surrender himself.

He was weeping openly, devestated by the pain, using the brick wall behind him to keep himself propped up. If it wasn't for their selfishness in wanting him all to themselves – and thus fighting each other instead of working as a unit – then he had no doubt they would have taken him by now, over and over again. Thank the Norns for small mercies.

One of the whooping throng forced his way forwards, clasped a hand around Loki's arm. His body responded, aching terribly for the Alpha to be inside him...the heat was getting worse, more insistent, more painful. But he still didn't want it to be like this, taken by a stranger in an alley, his choice stripped from him with his dignity.

"No!" he whimpered, pulling uselessly away as his captor tightened his grip and hauled him forward, "NO! PLEASE!" he howled.

"Hey!" a voice called from above, followed by a beam of light and the Alpha gripping Loki being knocked off his feet, "No means NO!"

Iron Man landed in the alley, scattering suddenly shamed-faced Alphas backwards, tripping over their own feet. Thor dropped down next to him in a crash of rage-fuelled thunder.

Stark released the mask of the Iron Man suit, revealing his face, "Loki?" he asked, eyes wide with sudden understanding.

"Brother!" Thor cried, those stupid puppy-dog-eyes of his going ridiculously round, and then narrowing with anger as he turned to the slowly-dissolving crowd of heat-crazed Alphas, "You were trying to RAPE my baby brother!" he bellowed.

Loki sank to his knees, unable to take the effort of standing. His bare skin hit the concrete, jarring his joints and scraping his skin. He doubled over to the sound of Thor pounding on some gang-banging Alphas, almost – but not quite – feeling sorry for them.

A shiver worked its way through his hot, sweat-drenched, body, "Nnngggaaaaaaaaahhh," he groaned, every nerve his body sending up signals of pain and distress, eyes squeezed shut as if the darkness could ease the hurt.

A blanket was placed around him, wrapping his prickling skin and covering his nakedness. A metal grip was manouvering him from the ground upwards, and lifting him over a shoulder. Comforting Alpha smell leaked into his nostrils.

"Stark...?" Loki mumbled, not entirely sure what was going on.

"I gotcha," a strong voice assured, as thrusters guided them gently into the air, and waves of calming Alpha pheromones washed over the Omega, "you're safe now."

"Gaaah! Ahh! Gaaaaaaah!"

Tony winced with every gasp coming from the bathroom of the guest suite. Thor was trying to clean Loki up in the shower. Rolls of Omega heat smell was roiling out with the steam, hot and enticing. Tony was mentally playing 'Three Blind Mice' on loop in his head – it always seemed to keep his mind off bedding Omegas. He knew Thor had a similar technique; which was just one of the reasons that attacking Omegas was completely unacceptable – Alphas weren't animals, they could control themselves.

"So, Loki's an Omega?" Steve said, breaking the uncertain silence that had developed between those gathered in the guest suite's kitchen.

"Certainly smells like it Stars-and-stripes," Tony replied, drumming his fingers on the table-top.

"So.." Natasha, the last of their little group, started, "what you're feeling right now is..." she trailed off, jumping up to sit on the counter.

"Right now," Tony said calmly, "I really wouldn't mind striding in there like a beast, slugging Thor in the face, and bending Loki..."

"Alright!" Cap said blushing, "I think we got the picture."

"But I'm not going to," Tony stated matter-of-factly, "because I have some respect for that beautiful person in there – who is having a really crappy day, by the way – and I also have a great deal of respect for myself and my ability to be a rational human being. No consent, no sex. Simple as that."

"But," Cap said, twiddling his fingers in a way which let Tony know just how awkward this birds-and-bees discussion was to Captain Boy Scout, "why didn't you notice that Loki's an Omega before? You never mentioned it, and, I mean, you've met him before..."

"Because," a strong voice said as Thor strolled in, looking tired, "my brother was...suppressed...for many years."

Nat's jaw actually dropped, "Why?!" she squeaked – she actually squeaked, "I mean...who...?"

Thor ran a hand through his stubble, "My father did not want an Omega son," he told them bitterly, "So, after his first heat had finished...my father summoned sorcerers to suppress him. At the time, I did not understand; I believed my father when he said that it was for the best...I regret to admit that in the years since, I have pushed it to the back of my mind, even when the suppression was renewed."

Steve shuddered, "Jesus," he said, "I was suppressed for a month for the Super-Soldier serum to take affect. Worst month of my life – and I had given permission. I suppose that it's no better with magic than it is with pharamaceuticals?"

Thor shook his head, "I would think not," he answered, regret cracking his voice and water gathering at the corners of his eyes.

Steve breathed in and out, no doubt remembering that month, and trying to get his head around how much worse it would feel to an Omega. Betas made up the majority of the population; unlike Alphas, they could not sense or smell the orientation or heats of people around them. Female Betas could conceive, male Betas could impregnate females. They had their own heatcycle – less violent and obvious than an Omega cycle – with careful mating rituals which tended to involve dinner and dancing. They weren't leaders – Alphas were leaders. Betas would listen to Alpha Commands almost as well as an Omega – something which Tony used to his advantage when it came to messing with Clint's head. All Alphas were male, but Omegas could be either and could conceive regardless. Suppression of any orientation was only done in extreme circumstances – like becoming a Super-Soldier – and then only for a short time. Suppressing long-term led to...pain...lots of it...and some pretty nasty psychological problems.

"He needs someone to..." Thor began, staring at his feet.

"I know," Tony muttered, standing up from the table and stretching, "but only if he agrees."

"Of course," Thor nodded seriously, "because if he didn't agree and you went ahead anyway, I would have to beat you to death with my hammer."

"Understood."

Steve shot Natasha a questioning glance. She shrugged, just as oblivious for once.

Tony started walking towards the guest bedroom, and a light went on somewhere in the heads of the Betas. Steve blushed and looked at his hands as Natasha's jaw dropped again.

"Stark..." Thor uttered hesitantly.

Tony stopped mid-stride and turned back to face the others, "Yeh?"

"He has only ever had one heat...and...Odin dealt with it, in the traditional way – by force – back when we both thought that Loki was my biological brother..."

Tony growled, "And we wonder why he became a supervillain!" he hissed, "What is wrong with you people?!"

Thor flinched but took the criticism, "Just...be good to him," he pleaded, not meeting Tony's eyes.

"I will," Tony murmered softly, and turned back to walk through to the bedroom.

"Right," Thor announced as they heard the bedroom door click shut, "I suggest we relocate unless we want to see Captain Rogers die of embarrassment!"

Loki was nothing but pain and raw want. He was curled up on the cloud-soft bed, a light sheet draped over him. His erection throbbed and his entrance was drenched with slick. He felt empty and in pain, and yearning for an Alpha...but he was also scared. This had only happened to him once. And that time...was one he did not want to remember. He did not want to get hurt.

The door opened and closed softly, and there was Alpha scent in the room – soft, soothing, reassuring, and mingling with his heat-scent. Loki opened his mouth to taste the pheromones, sighing.

A hand came to rest on his arm as an Alpha body sat down on the bed. Where the fingers touched his skin it was warm, gentle, reassuring.

"Loki?" a voice asked gently. An Alpha voice, making him keen with want.

"Tony?" Loki whispered, moving his head ever-so-slightly to look up at him.

"I'll only do this if you want me to," he moved his hand up to stroke Loki's face, gently, tender, loving, "say the word and I'll leave and call Omega Services' on-duty Alpha – or any other Alpha you can think of. But I can't leave you to deal with this alone – you'll get sick, maybe even die. Understand?"

Loki nodded. He could certainly believe it. He was in so much pain already, "I know few people in Midgard," he whispered, "I...would prefer you...if you'd be willing..."

Tony chuckled softly, "If I wasn't 'willing' I wouldn't be here," he said, leaning in to kiss Loki's cheek.

Loki moaned with unfulfilled want, sending shivers of hormones and lust through Tony, whose jeans were already standing to attention. It was strange though, how small the god looked in the bed, how broken, how vulnerable...

"We're gonna take things slow," Tony was telling him, even as he stripped his clothing off, his arc reactor gleaming in the darkened room, "nice and slow Lokes..." he drew the fragile body to him, knowing that the touch – the intimacy – would give Loki more of the reassurance he craved, and ran his hand up and down the Asgardian's clammy flesh.

Loki whimpered and melted into the embrace, his lips brushing the skin of Tony's chest, after a moment or two Tony spoke again, "You ready?" he asked tenderly, trying not to place too much pressure on the words despite the fact that he just wanted to be in the warmth of the body in his arms.

"Please," Loki begged, his tone and the tears in his eyes betraying the volume and power of his need.

Tony eased a finger into the Omega's entrance, which was already saturated with slick to aid him in. Loki bucked slightly, unused to the foreign feeling within him, but smiled uncertainly with the beginning of the release of so many years of hurtful, built-up, suppression. Within a short space of time, Tony could slip another finger inside him, moving the digits skilfully and working Loki gently open, kissing the nape of his neck to keep him relaxed and happy.

Tony rolled Loki over gently onto his front, so that his stomach was pressed to the sheets. With one hand, he grasped Loki's wrists – comfortably, tenderly – and lightly pinned his arms above his head, his ebony locks mussed further by the movement. With his other hand, he pulled his fingers from Loki's now deliciously wide entrance. He lined himself up, and, aching for Loki, he started to ease his length in. Loki responded with a delicious sigh, bucking his hips luxuriously and aiding Tony's progress until he was buried to the hilt. Tony moaned with pleasure, aware that he was probably giving off a multitude of hormones right now, which were surely adding to that beautiful smile curling Loki's soft lips.

They moved together, Loki lost completely to the biological responses of heat-sex, and Tony lost to the ecstasy of Loki. Tony Stark had had several partners – more than a few of which had been in-heat Omegas – but none had made him feel like this. His thrusts were deep and slow, making both men moan obscenely, and Tony felt like he was inside Loki – not just physically, but his soul, the two of them entwined in each other.

Loki's pupils had overtaken most of the iris, the stimulation and the affects of the heat controlling more of him than any drug ever could. Thank whoever may be watching that they had found Loki when they did – before he had been unable to resist the Alphas who would treat him as another whore, a thing to be used and then thrown away. But he wasn't undamaged...Thor had explained that... Tony banished the thoughts from his mind, afraid that the anger he felt towards Odin in particular would soil the tone of their coupling or be picked up on by Loki somehow. The Omega was squeezing his eyes tightly shut, and that's when Tony realised his knot had started bulging, stretching Loki out further.

"Tony..." the Omega cried as the knot forced its way into him.

"Shhhh," Tony whispered, stroking Loki's hair while he rode the waves of his pleasure, "It's OK Lokes, you can take this," he grabbed Loki's hand, the Omega grasping his fingers with all the strength he could muster, "I'm here."

Tony released into him, preventing further conversation. Loki squealed with a mixture of pain and pleasure as Tony's seed hit his insides, providing the chemicals Loki's body had been craving alongside Tony's sperm. Loki came over the sheets, face a picture of frail bliss, and they both slumped, spent, on the bed.

"Jarvis," Tony muttered, about half an hour of cuddling later.

"Yes sir?" the AI responded.

"We need some clean sheets, and some pyjamas for Loki – comfortable ones, 100% cotton, none of that nylon crap. No silk, he's in heat and it doesn't wash out."

"Yes sir," Jarvis answered promptly, "Anything else?"

"Set breakfast-in-bed for about 8, and order in some morning-after pills," he turned to the Omega, "I'm so sorry, I should've thought about contraception before," he murmured into the top of Loki's tired head, "Omega suitable Jarvis! If you get in pills for Beta-chicks then we're gonna have some problems."

"Of course sir," Jarvis replied, "noted, and ready to be implemented at the desired time."

A maid came up with sheets and the pyjamas, and Tony had to lift Loki from the bed and dress him before he let the young lady in to change the sheets. Loki was, expectedly, weak and sore, barely able to lift his head, but with a weary smile on his face that made something flutter in the region of Tony's arc reactor.

"You can go now," he muttered, eyes closing, as Tony placed him in a chair while the maid pretended not to be eavesdropping.

"Why?" Tony asked, genuinely surprised.

"I don't need pity," Loki slurred, "You'll smell me when I'm ready for the next round. Odin -" Loki stopped short.

"I'm not Odin," Tony spat.

Loki flinched at the Alpha anger rolling off him, and Tony forced himself to take a deep breath and count to ten.

"I'm not Odin," he said, forcing himself to be even and calm, "and I will not leave you when you're this vulnerable. Apart from that, the less Alpha contact you get, the more painful this heat will be. I could never do that to you."

"I'm not a damsel in distress," Loki murmured. "You can't dress me up as something I'm not Stark. I'm never going to be a biddable little Omega playing wifey for you, and as trophy-conquests go, I'm hardly the firecracker in bed I'd need to be for that."

"Loki," Tony said, kneeling next to the chair, "Look at me! - There – I don't want some damsel, I don't want a 'wifey' and I sure as fuck don't want a trophy. Whether this goes beyond this heat is up to you when your brain isn't fucked up by hormones, but for now, there is nothing in this world I want more than to help you through this." And it was true. Tony just hadn't realised how true until the words were out there, hanging in mid-air and being gawped at by the maid.

"I think you could've made six beds by now," Loki called hoarsely to the woman going ridiculously slowly with the sheets across the room from them.

She blushed a rather bright shade of red and quickened her pace considerably. Tony chuckled to himself as she scurried out with the dirty laundry.

"You're not going to leave me?" Loki whispered, not meeting Tony's eyes, once she had gone. The tone pulled at something in Tony's chest.

"No," he said, resolute, picking Loki up in a bridal hold to transfer him to the comfortable clean bed, "I'm not leaving you Loki."

Loki smiled, falling into a gentle sleep, "Beds are more comfortable than the dungeon floor," he whispered as he drifted off.

Tony lay down next to his Omega, his Loki, gathering the slim frame in his arms, and fell asleep breathing in his scent.