Author's note:

Hi ya'll. Just wanted to introduce this story a bit in case the subject is a bit confusing.

So this is an ABO fic, which I'm not sure is very well known in the Naruto fanfic universe. It's extremely popular among the Reylo ship community and I was immediately drawn to it.

Kakashi and Sakura scream Alpha and Omega to me. This story has been stuck in my head for a pretty long time. I was extremely hesitant to post this because I had no idea how it would be received. But I guess there's only one way to find out!

I just want to be clear as to what I have envisioned for this fic. It's going to be heavy. Heavy as in it's going to be pretty dark and angsty. It's going to be extremely sexual too. This is rated M for a reason, guys!

Alright, if that all sounds interesting to you then I really hope you enjoy this!

Sakura didn't fuck Alphas.

She let out a harsh breath as she entered the hospital. She wasn't in a particularly chipper mood as she entered the familiar sterile environment, thinking about how she was going to get through the day. Because you see, it was 'physical day'. Physicals for Alphas. Alphas who she needed to remind to take their blockers almost every time they came to visit. Alphas who she needed to keep in their place. Alphas who would look at her like she was their prey, leering at her and showing off their knots to her.

But Sakura didn't fuck Alphas.

You see, Sakura was an Omega, and according to 'biology', her body was designed for an Alpha's knot and cock. According to biology, her Omega status made it so that her one purpose in life was to find an Alpha mate and bear their children. Alphas and Omegas were seen as the one true pairing. Betas be damned to ever feel something as intense as the connection of an Alpha and Omega pair.

But Sakura didn't fuck Alphas.

Pushing the door in to enter her office, she sat at her desk and booted up her computer to review her schedule for that day. It was no secret that Sakura was an Omega. She had presented when she turned 16; had her first heat when she was 20. She saw out her first heat alone, and did so with the few subsequent heats after that. Throughout those heats she had never wanted to seek out the assistance of an Alpha. Her virgin mind feared an Alpha's rut, often triggered by an Omega's heat. But her virgin Omega body practically begged for it.

But Sakura didn't fuck Alphas.

Her virginity was taken by a nice Beta boy. Someone she trusted not to go into rut and practically destroy her. Someone she could maybe rely on for her heats. And that had been the plan she went with at that point in time. Have a nice Beta to assist her when it came time for her heats. It seemed like a nice plan…

Until one night she had gotten a little too intoxicated with her Beta friend, Ino, and woke up the next morning to find that she had sex with an Alpha. She woke up to the most intoxicating scent. The Alpha lying next to her smelled like he had come fresh off a visit from the mountains; concentrated with that fresh mountain air, smoke from campfires and a hint of bourbon. What she was surprised to find was that she felt extremely relaxed and satisfied, like she had just had the most fantastic lay she had ever experienced in her life.

But Sakura didn't fuck Alphas.

She had decided after that random encounter that maybe she would try one heat with an Alpha. One heat wouldn't do any harm, right? Besides, it's what her body wanted, practically craved, and why would she deny what was basically biology? The center of her entire life.

So, she saw her next heat out with an Alpha, and she found it to be the most exhilarating and mind-bending experience. The Alpha met her body's every need. He kissed her the way she needed to be kissed, touched her where she wanted to be touched, and fucked her just the way she needed to be fucked. Her heat had lasted 3 days with that Alpha. Two days shorter than it would have lasted if she went through it alone.

So, Sakura exclusively fucked Alphas for a almost a year.

Until the incident.

The incident that made her swear off Alphas for good. The incident that made her distrust almost all Alphas. The incident that completely changed her life and permanently changed her view on those wretched Alphas.

No.

Sakura didn't fuck Alphas.

Never would she fuck an Alpha ever again.

Sakura squinted at the bright screen as she looked over her schedule. Most of it was comprised of Alphas, since it was the day the hospital had set aside for their physicals. She thought it was a bit cruel that she had to be subject to this, due to her designation. Most of the nurses or doctors performing the physicals were Betas and if there were any Omegas like Sakura…

Well.

She just hoped they didn't stoop low enough to stop taking their suppressants just so they could have a romp with an Alpha.

Alphas could be rowdy and bold, and Sakura really didn't have the patience for that. She didn't have it in her to feel the penetrative gaze of an Alpha roaming her body simply because of how she smelled. She didn't feel like dealing with overly enthusiastic Alphas pinching her ass or calling out obscenities.

You want my knot don't you, little Omega?

The thought made her immediately tense. Maybe she'd be able to go to Tsunade to pull out of this. As a fellow Omega she understood Sakura's discomfort with Alphas to a degree, but didn't exactly understand where her hatred seemed to come from. With a deep breath to calm her nerves Sakura studied her schedule once more, finding her first set of patients. Her first two patients were Betas, just coming in for some routine checks that they had scheduled months in advance. That was all fine and good. She just needed to find her first Alpha patient.

She squinted a bit to read the short description.

Name: Hatake, Kakashi (#009720)

Designation: Alpha

Age: 39

Height: 181.0 cm

Weight: 67.5 kg

Blood Type: O-

She frowned, not feeling…anything really. Indifference? Her first Alpha patient was her former sensei. She had to admit, he wasn't her ideal patient but it was better than just some random Alpha. Given the current state of their relationship, he'd probably want to do anything possible to get it over and done with, which Sakura would be perfectly fine with.

Kakashi-sensei had never paid much attention to Sakura in all of the years that they had known each other. Sure, she wasn't the most pleasant teenager to be around but despite all of the years they spent together, she never really felt like she truly belonged to Team 7. She wasn't special like Naruto or Sasuke. To make matters worse, once Sakura presented, Kakashi seemed to forget she even existed. He wouldn't so much as even look at her, which made her feel so small and irrelevant.

She hadn't properly spent time with him in years, really. Sure, she had seen him around the village and he'd give her a short wave or nod, but if she ever got close enough, he would wrinkle his masked nose and sneer at her, as if her scent was just completely repulsive to him and would continue to abruptly disappear around a corner.

She sighed and brushed a hand through her hair. Either way, it was going to be an awkward encounter. She hadn't had a proper conversation with Kakashi-sensei in years. She had no idea what to expect from this. For all she knew she could walk in there and find him jumping out the window at the first scent of her.

That would probably be ideal, she thought to herself as she pushed herself up from her chair and grabbed her charts. She grabbed her white coat and slipped it on then tied her hair up into a messy bun, taking in a few deep breaths, willing herself to just get through this day.