“I have this condition.” Arthur kept his voice at a murmur, with a tone of confiding something he trusted Eames with. He sighed. “I... go into heat.”

A brief primer on the concept of Alpha/Beta/Omega Universes: Also known as that trope suddenly showing up in your fandom that doesn't make any sense.

Steve had to admit that he had some reservations about how the New Century handled the social balance between alphas and omegas.

There was no good way to say it: sorry about your surprise sex swap and your nonconsensual werewolf bite also rearranged your butt plumbing and congratulations, I've probably destroyed your sex life forever were not exactly Hallmark sentiments.

Derek's fourth Chase will be his last if he doesn't catch an omega this time. He's starting to doubt this whole soul-mate thing anyway, at least until someone from his past shows up and gives him the run of his life.

Sidney Crosby isn't the only omega playing in the NHL, but he is the only one suffering from heat-delay.

Patrick Kane has soft hands.

When Steve and Tony wake up to find that they've been captured, they assume things can't get any worse. They're wrong.

Steve has fantasies about Tony being an omega, very sexy fantasies...

Erica and Stiles are convinced that they're going to go down in history as the first-ever omegas at Beacon Hills High School to go unclaimed. But they also, deep down, have an alpha that they're hoping will come to them when they go into heat. Both of these ideas about instinctive mating are pretty much entirely wrong.

When Patrick met Jonny for the first time, it was because they'd both just been picked for the same hockey team. When Patrick netted his first goal during practice, Jonny skated over to give him a congratulatory hug and, well, it's not like he didn't sometimes shift on accident, when he was excited or happy, but it hadn't happened at practice in ages.

It's the hazards of having so many omegas in close proximity for so long. They tend to synch up.

Clint is an omega who isn't interested in mating. Ever. That doesn't mean he wouldn't like a romantic partner, though. Unfortunately, he's never found anyone who was okay with the whole lack of interest thing... but there might be hope yet.

All Skyjumpers are omegas and help each other through their heats. But lucky Caine has himself an alpha now -- and Stinger's heat is shaping up to be a bitch this cycle, and he could really use her help, if Caine doesn't kill him for asking.

“You’ve done your best,” Cullen interrupted absently, and Dorian’s eyebrows arched in surprise. Cullen stared back evenly, hiding his own instinctive amusement. Mother Giselle glanced at them both, then shuffled away, back to the wounded, leaving them alone at the fire. Finally, however, to Cullen’s surprise, Dorian’s wry, faint smile curled into something warmer. “I’m never going to get used to that.” “To what?” “Being interrupted,” Dorian said dryly. “Here in the South.” “Because you’re a mage, and I’m an omega?” Cullen asked, a little testily.

He keeps the aqun-asala powder in a jar on his dressing table. Every three months he spoons some of it into a mug and mixes it into the water with his finger. It's supposed to be tasteless, but when he swallows it down it lingers on his tongue, affects the taste of anything else he eats for the next couple days, mutes everything. He gets a kick outta eating spicy shit all lackadaisically and offering it to people, and acting surprised when it burns their mouths. (When he explains it to Sera, after she's stopped crying and threatening to stab him with one of his own horns, she thinks it's hilarious — tries to talk him into letting her have enough to prank people, actually. He knows exactly how much is left in the jar though, and he's not sure he's ever gonna get more... so she has to make do with sitting next to him and watching.) "So it keeps you from losing it, huh?" she asks, glaring down into her empty flagon like she doesn't know where the beer got off to. "No squishy pffff—" she puffs up her cheeks and sets the flagon down, curving her hands into a circle and then moving them apart, "—for the qunari pokers?"

On any given day, Sherlock might come out of the bathroom smelling like an Alpha on the hunt (Alpha #8) or an Omega in heat (Omega #9), a Beta brooding (Beta #3), or like no gender at all. The last one was his actual scent, which wasn't so much scentless as confusing. At least in an adult. If Sherlock and John were the sort of people to read Mills and Boon novels, they could have said that what occurred was because destiny intervened and set two destined lovers in their one true pairings' path. It was the lasagna.

Tony Stark; genius, millionaire, awkward virginal alpha, and reclusive CEO of Stark industries. Steve Rogers, reporter for the New York Times, omega, and one of the single most domineering men Tony has ever met. He shouldn't want this, shouldn't like the things Steve offers, but he's never really been one for following the rules, now has he?

In Which A Young Omega, In Defiance Of Both Stereotype And Politeness, Propositions An Alpha Of His Own Blood Caste, And Is Rewarded For His Daring; Contains Awkward Pre-Heat Negotiations, A Supportive And Extraordinarily Unconventional Clade, Heat Cycle Copulation, An Incidental Human Character With Attendant Barkbeast, The Brief Appearance Of A Tealblood Whose Flouting Of Convention Should Not Be Emulated, No Production Of Eggs Whatsoever, And A Hive Of Bees With No Actual Bearing On The Narrative's Outcome.

It was just Rodney's luck that the guy with the strongest expression of the ATA gene on Earth was some lanky alpha who couldn't follow an order as basic as "don't touch anything."

Being away from Earth means going without heat suppressants. This proves to be a problem for Lance who has been avoiding his heats since puberty. Lucky for him Shiro and Keith are willing to help. “I thought that was why you were being such a jerk.” Keith’s feet shuffled over over the carpet. “You know. Another omega in your space?” “No, I just really find you annoying.”

Keith stood under the hot spray of the shower head, his eyes closed as he focused inward, trying desperately to regain some sense of composure. He wasn’t quite certain what was wrong with him today; he was the one moving out of sync in their training exercises, he’d run himself into an invisible maze-wall so hard he was dizzy for a quarter hour after it, and he swore he could still feel the static jolt under his skin. When Shiro had touched his shoulder, eyes concerned, his touch was like a fresh electric current and Keith had yanked himself away.

Keith can't have nice things. That's it. That's the story. (Or, in which Keith slowly learns that sometimes the best family is the one you make, Pidge has strong feelings about peanuts, Lance has a secret but would've spoken up sooner if he'd known it would break Keith's brain, Hunk is the actual best, and Shiro is just relieved he didn't have to give anyone the Talk.)

Keith thinks he's about to get rickrolled. Keith is mistaken. When he opens the email, all it says is Saw this and thought of you, happy birthday buddy, followed by a link to a video hosted on a Google drive. Keith gives it a long look, weighing suspicion against curiosity, the fact that he knows the sender of the email against the fact that he knows the sender, and then shrugs suspicion aside. He's probably about to get rickrolled, but whatever. He clicks the link. It's not a rickroll.

Just because an alpha can go through rut alone doesn't mean he should. "Okay." Lance's palms were sweaty with what he was about to say. He was about to break so many rules. "Cards on the table, guys. We got any omegas sitting here?"

Midoriya and Todoroki get hit by a quirk that triggers heats and ruts. In the 48hrs that follow, the secret that Midoriya has kept hidden is painfully revealed. Both Todoroki and Iida must find a way to keep him safe without hurting him further...and they'll need Bakugo's help.

Armin, an Omega, has been raised all his life to be a consort. An Untouched, deprived of physical contact, he is desperate for an Alpha to choose him as their own. When he's brought to the palace to be the only consort of the crown prince, he thinks his life is perfect. But there are dark secrets buried beneath his Alpha's kind exterior, and when they begin to reveal themselves Armin's idyllic new existence is shattered.

Sequel to '48hr Love Song.' In 48 hours things changed forever. Now Tenya finds himself on the road to an exciting future . . . if he can get past the maze of family politics threatening to trip him up. Things aren't easy when you carry a legacy like his, and your loves both have shadowed pasts choked with secrets. As for Ochako, she suddenly finds the road she's been on is actually a dead end. Lost and unsure of herself, she has to find a new direction to move in. Edit: Please notice updated tags

Kirishima might not be first in the class but he's way smarter than to take Bakugou at his word about exactly what he's ready for during his next heat.

Obviously this was all the fault of Katsuki's perv classmate and his aerosolized heat trigger. Once Katsuki gets his life back under control, everyone will forget all about this moment of weakness. Nothing will change. He won't let it change. After all, he's going to be the number one hero one day. Just because omegas never go pro, that doesn't mean it isn't possible, right? ...right?

Shiro's heat hits, and Keith helps him with what he needs

Heat fic. 'Nuff said.

“Simon,” Raphael gasps out, and Simon’s dark eyes track his every movement, flicking down to his fingers and dragging back up Raphael’s body slowly, leaving a trail of liquid fire in their wake, “You have to help me, Simon, please – “ “Anything.” Simon says quickly, his voice cracking, and Raphael can feel Simon’s arousal, the scent thick as it curls possessively around Raphael, “Anything you need.”

Short fics originally posted to my Tumblr, edited and collected here.

Kirishima tries to help Bakugou out during his first heat, and things get complicated.

"You wanna tell me what's fucking going on here, Half and Half, cause you look like shit and you smell even worse." Todoroki has been hiding his omega status for years, but one night his suppressants stop working. Fighting against the heat, Bakugou finds him and attempts to tell him off.

Sawada Tsunayoshi is born an Omega in a world that expects nothing from his dynamic except submission. Tsuna is many things – hopeless klutz, booksmart-deficient, heir to a bloodline some people would like to keep secret – but, as it turns out, ‘submissive’ is not one of them.

Omegas are inviting. Warm. The heart of pack life. Tsuna never believed he'd be any of those things. (Omega Tsuna, warm and wonderful but entirely unaware of it, unwittingly draws others to him and inspires unwavering loyalty.) No Mafia. Tsuna's "Family" is just his patchwork pack of similarly damaged children. Lots of platonic pack feels and bonding. Endgame Tsuna/Hibari.

Once the scent came to his nose, Oberyn had to pursue it. He had to find the source.

Sawada Tsunayoshi is born an Omega in a world that expects nothing from his dynamic except submission. Tsuna is many things – hopeless klutz, booksmart-deficient, heir to a bloodline some people would like to keep secret – but, as it turns out, ‘submissive’ is not one of them.

Tsuna learned young that he was not his parents priority. So he never said anything about the itch under his skin, about the way he sometimes felt his body burn from the inside or how the only time he felt calm was when blood ran like rivulets down his skin. [Or the one where Tsuna finds a family for himself and subsequently starts taking over the world (by accident)]

Yuuri, under the username of Eros, is a size queen omega who most certainly does not have an obsession with fellow camboy and legendary silver-haired alpha Aria. Just like Phichit is not the most meddlesome roommate known to man.

“Who are you?” Graves demanded hoarsely. “I’m Newt. Scamander. Err. Pleased to meet you. I mean, I would’ve been pleased to meet you, under normal circumstances.” “Scamander.” Graves frowned to himself. For someone who was supposedly in a bad rut, he seemed perfectly in control. “Your accent, it’s British. Any relation to Theseus Scamander? Head of the DMLE?” “I’m his younger brother.” “Are you an Auror?” “No. I’m a magizoologist.” Graves exhaled, exasperated. “A what? Is this a rescue or are you a hostage?” “Sort of neither,” Newt admitted.

Gladio gets his kinks indulged by the other three while camping and in heat.

It's involuntary the way his knees seem to buckle and give out and throw him onto the ground. It takes him a moment to realize he's hyperventilating, tears running frustratingly down his cheeks as he rubs his clothed erection slowly against the carpet. / Or the one where Bakugou Katsuki is presenting as a fucking omega, and there's nothing he can do to stop it

Stannis Baratheon flowers as an omega after the end of Storm End's siege, what will it mean for Westeros?

It takes him two months, one more heat, and the NHL omega entry course before he realizes that he was meant to let one of them take him through it. They don't do it like that in Sweden, which Nicklas mans up and valiantly explains to the room after he makes it back from camp. They don't use humans as tools. All people are people, and Nicklas would never — he couldn't imagine having a teammate inside him every time he fell into heat, however willing they might be. His body is his own, and they all touch him far more than enough already. He refrains from mentioning that last point to the team.

Everyone thinks that the elegant imposing Lan Wangji must be an alpha. Wei Wuxian however will learn the truth once the baby fever hits both of them.

Geralt is not making a nest. Jaskier has noticed this. Geralt is in fact drinking a rather foul-smelling potion that sours the sweetness of his scent and muffles its otherwise obvious meaning. “Does that stop heat?” Jaskier asks curiously, absentmindedly tuning his lute as he speaks. He hadn’t thought anything could, but, well . . . witchers and their potions. “No,” Geralt says darkly.

Lan Wangji is alot of things. He is intelligent, well-mannered, loyal and unfortunately an omega.