When Eren Yeager had presented as an Alpha at the age of 16 it was celebrated throughout his family and friends. Most of whom said they had a feeling that's what he'd be. The words still filled him with pride 'So proud of you Eren' 'So strong' 'Amazing'. He didn't think those words would ever leave him. His family had always told him he was strong, he never believed them but he was an Alpha now and he had much more confidence in himself.

When Levi Ackerman had presented as an Omega at 19 years of age his family and friends responded very differently. He remembers them shouting at him 'disappointment' 'weak' 'pathetic'. That was when he made the decision to take himself to the military. He was aware that the military didn't allow Omegas in their ranks but anything had to be better than this hell hole he'd been calling home for the past 19 years.

*2 years later*

He couldn't stand it anymore. The looks he got from his family and friends every day. He was sick of them looking at him like he was broken. He sent away for application forms to join the Survey Corps. He filled out all the application forms, completed the academic tests that had been sent to him and even completed a phone interview. He had them delivered to his friend Hanges house so his parents were blissfully unaware that they would soon be rid of their 'disappointment'. He finally got the letter that asked him to go in for an interview with Commander Erwin Smith. He'd never been so nervous in his entire life.

The morning of the interview he told his parents that he would be out most of the day, not that they cared but he still had enough manners to tell them that he wouldn't be back for dinner. He would grab something with Hange after the interview.

"I can smell you from here boy!" These were the first words that came out of Commander Erwin Smiths mouth that fateful Monday morning. He would find out today if he was allowed to serve with the other troops. He had never been asked what his dynamic was, which he was thankful for. He assumed it was because only Alphas joined the military and Omegas stayed home until they found an Alpha, moved in with said Alpha, bonded and then started their own family. Not Levi, he didn't want an Alpha, didn't need an Alpha, didn't want a family, he wanted blood. He wanted to channel all his anger into doing something useful for his country, if they'd let him that is.

"...Sorry Sir" Levi said turning his gaze towards the floor. He should have known he wouldn't be able to hide it being this close to another Alpha.

Erwin made his way around to the other side of the desk and stood in front of the chair Levi was sat in.

"No bond marks eh?" He asked a slight hint of shock in his voice. The boy was 21 and not bonded. Incredibly unusual.

"No Sir" Levi answered firmly.

"Been in heat yet?" Erwin asked. This caught Levi off guard and his eyes went wide. He hadn't been prepared for the intimacy of that question.

"Look Levi, I'll be honest with you. We don't let Omegas into the military and you know that but your skills are too good to be passed up. I have a recommendation if you're willing to hear me out?" Erwin was kneeling down beside Levi now, making Levi even more self-conscious of the height difference between them even if he was sat down.

"Go on" Levi muttered folding his arms defensively across his chest.

"If I allow you to join us, we'd be sending you on missions in groups filled with Alphas and Betas." Levi nodded, he wanted that, he wanted to be out in the field.

"We would need you to start taking suppressants immediately." Levi went rigid, he had heard horror stories about what they did to Omegas, especially male Omegas. Male Omegas were an incredibly rare phenomenon. Male Omegas could reproduce and these suppressants were known to stop that happening altogether. Not that this was a major concern to Levi as he didn't want a family but the damage they did to an Omegas insides were not something he wanted.

"I'll repeat my previous question, have you been in heat yet? Your files say you were very late presenting" Levi blushed for the first time in his entire life.

"Once about two months after I first presented...It was hell" He responded, blush still high on his cheeks. Erwin didn't respond, he nodded and headed back around to the other side of his desk. He picked up two sheets of paper, one pink and one blue.

"I'll need you to fill out these consent forms." Erwin handed them to Levi who had scooted closer to the desk. He took them and studied them carefully.

"Birth Control consent and heat suppressants huh," Levi said. He was happy enough to sign them as he wanted to join the Corps more than anything.

"We can't have you getting pregnant if you decided to sleep with someone and we need to control your heat so that you're not found out in the ranks. They would eat you alive; literally, if they found out we have an unbounded Omega in our midst"

Levi flinched but nodded, he knew that just being here was dangerous; anyone that passed Erwin's office would be able to smell him. He had never used any sort of suppressant and had only had one heat so far which was strange in and of itself. Levi had never even thought about sex so he didn't think he'd ever need the birth control. The perks of being an Omega he guessed.

"Done," Levi said shoving the papers back into Erwins hand. He sat back on the chair arms folded tightly across his chest.

"Go and collect your things and bring them to the barracks, I'll have your pills ready to collect when you get back" Erwin dismissed him and Levi headed to collect what little he had. It only took Levi three days to move his belongings. Most of them had been at Hanges anyway.

**2 Years Later**

Levi had just finished a gruelling training session with the new recruits. This was the first year he had been a Captain training them. The last two years had been intense, to say the least. Titan attacks had been on the rise and hit an all-time high around seven months ago. Levi had never shown any fear when gearing up and heading out to fight.

This was why he was known far and wide as humanity's strongest. There were some days he hated that name, it made his skin crawl. Other days however it empowered him. Not that his emotions would allow you to see any difference. Levi was great at a lot of things and hiding his emotions was definitely top of that list.

"Levi..You in here?" He heard Erwin calling from the door to the showers. Levi rolled his eyes, he could never get a minutes peace with that man around.

"Yeah. Can this wait? I'm disgusting" Another pet hate of Captain Levi Ackerman was dirt, any form of dirt on him and he would not be happy until it was off of him. Erwin didn't answer so that was evidently a no.

"Can you talk while I shower at least?" Levi huffed not waiting for an answer before heading further into the washroom and turning on the shower. He heard Erwins footsteps approaching stopping just far enough away to give Levi some privacy.

"We've just received an application for a new recruit. Late I know but you should probably look over it" Levi turned to face Erwin, he was never normally consulted when it came to new recruits. He just trained them.

"Name" Levi said bluntly.

"Eren Jaeger" Came the response.

"Age"

"17, due to turn 18 in six months"

"I'll look over his application when I'm done here" Levi turned away from him to continue washing himself, making sure there were no remnants of dirt left anywhere on his body.

Levi dressed in fresh clothes and headed to his office. He had been given the office around a year ago. He enjoyed having his own space and the office also contained a bed and there was a bathroom adjoined to it. He entered the room and sat at his desk, his body was physically exhausted. He had been pushing the new recruits harder than any group he had trained before due to the increase in titan attacks.

Laid out on his desk were this Eren kids application to the Survey Corps. Levis eyes were wide as he read the entire application. This kid had seen the carnage in Shiganshina, where the first Titan attack had been. He'd been through the wars himself and even helped stop a few with just basic materials and this wasn't his first application. Levi vaguely recognised the name from last years application list. Looking at the photo that was attached it was hard to believe that this kid was only seventeen. He also looked incredibly different from last year from what Levi recalled. More muscles, more definition and his face...it was filled with anger and hate. The expression reminded him a lot of himself when he'd first joined the Survey Corps. Who was he kidding he was still full of anger and hate.

Nestled under Erens application were some other forms. Forms to be completed so he was able to obtain his birth control and heat suppressants. Shit. He'd completely forgotten about them. Last year he was given an eight-month supply because they were going to be away from the barracks on a mission and weren't sure if they'd be back in time each month to restock.

He checked the date and the dates on the forms. It took around three days for the pills to arrive once the forms had been checked into Erwin. A cold sweat ran down Levis spine. He tried to work out if he'd been taking his pills lately or if he needed to, he couldn't think straight. He hoped to every god that he'd been taking them subconsciously or he was going to be in trouble. He had to see Erwin, he'd know.

"Erwin, we need to talk" Levi marched into Erwins office, forms in hand. Erwin saw them as he entered.

"I was wondering when you'd give me those. I thought you'd decided to let nature take its course" Erwin commented.

"You'd kill me if I did. I would kill every son of a bitch that looked at me sideway if I didn't take these." Another cold sweat ran down Levis back, he hadn't been taking them recently. That meant a heat that he'd been suppressing for over two years was soon going to rear its ugly head.

Erwin knew that Levi wasn't joking when he said that. If Levi went into heat in the barracks he would have every Alpha and Beta knocking each other out to get to him, followed shortly by Levi knowing each of them out.

"You're respected enough now to be able to make your own decisions," Erwin said, seemingly unfazed by the situation.

"Erens got the go ahead from and here are the god damn forms. Get me my pills, Smith!" The forms were thrust over the desk as Levi stormed out.

The next day Levi woke up differently. He could smell something. Something he had never smelt before. He'd never had an incredibly strong sense of smell so this morning was odd. He managed to pull himself out of bed, dress and head down to the hall for breakfast.

"Good morning Captain Levi" The greeting came from some of the new recruits he'd been training yesterday.

"Morning brats" was all Levi replied as he continued his way into the mess hall.

Levi entered the mess hall and was greeted with the usual sight of rows of soldiers sitting side by side chatting and eating their breakfast. One thing was different. That smell. All he could concentrate on what the smell that was bombarding his nostrils.

Levi soon found the source of said scent and he felt sick to his stomach. His nose had led him to none other than the new young recruit Eren Yeager. He wasn't aware Eren was starting so soon. He had obviously moved his belongings into the barracks in the middle of the night. What was the rush he wondered?

It was said that when an Alpha found their destined Omega they would know by scent, same goes for Omega. Unfortunately, there were cases when the Alphas chosen Omega wasn't the Omegas chosen Alpha and vice versa. Levi could feel every muscle in his body getting a few degrees warmer. His heat was approaching, thick and fast. Was Eren his Alpha?

He needed to get out of the hall before anyone started to suspect anything. A room full of Alphas and Betas would surely recognise the smell of an Omega going into early heat, even if it had been years since they'd smelt it.

He couldn't get his feet to move. His gaze was fixed on Eren. He was just about the turn and run when Eren looked up at him, locking their eyes together. There was white noise in his ear, he could see Eren visibly inhale. He could smell him. Soon other eyes landed on the Captain. He needed to go, he needed to run.

He turned on his heel ignoring they eyes on him, ignoring the calls after him. He bolted and had no intention of stopping. He made a beeline for the stables, he needed to get his horse and get out of the barracks as fast as he could.

He rounded the last staircase that would lead to freedom when he suddenly felt his shirt being pulled up by the shoulder and his back came into contact with a wall.

"You can't keep running Levi. I know you said you didn't want an Alpha but maybe this is your chance." It was Erwin, he should have known, should have known that Erwin would know his plan.

"He's seventeen Erwin! He's a child!" Levi was frantic, the heat in his body was getting unbearable. He couldn't stay here much longer without throwing one of his fists into Erwins face and that would be a terrible idea.

"Looks like he doesn't mind" Levi froze as he listened to the sound of footsteps approaching and his name being called.

"Maybe next time, when he's over eighteen! Get my pills and I'll be back in a week" Levi was thankful that Erwin was mated already to someone outside the barracks so Levis scent had no effect on him because he was starting to release extremely fragrant pheromones.

"Be careful Levi. This is your first heat in two years, it's going to be intense. If an Alpha scents you..." Erwin didn't have a chance to finish that sentence because Levi was gone.

Levi ran as fast as his feet would carry him, which was becoming slower and slower with every passing second. His mind was a complete mess when he eventually reached the stables. He mounted his horse and gave it a swift kick in the sides and he was off. Out of the barracks, out of sight and more importantly away from Eren.

Every Omega instinct in him was screaming at him to go back and let nature take its course. If he had his birth control pills he may have just considered doing it so he didn't have to suffer for the week. He didn't have them and there was no way he was going to ruin Erens innocence on his first day in the Military.