A/N: I know some people are confused about this, so I think a brief explanation might be in order! To put in simply, if we disregard that this story was inspired in by the Omegaverse, the easiest way to understand what's happening without the long explanation is to think of them as maybe Werewolves (without them being the actual supernatural being). There are hierarchies: the Alpha, the Beta, and the Omega. All characters are ruled by instinct. That's the main thing here. Nature vs Nature. Hope this helps! If not, leave me a message, and I'll try to explain it better!

Thanks for reading everyone!

He thought maybe the gust of wind that occurred once the door opened would provide clarity. It didn't.

Instead of showing shame and embarrassment, he pressed her against the floor, and he hovered over her. Like a lion protecting its kill, he growled at the intruder. He bared teeth and scowled, daring anyone to step closer to them. He would tear anyone apart who tried to take her away from him.

"My, my. That's quite a scary look you have there, Kurosaki-san."

He registered the words barely before he was stuck with a needle. He groaned as his vision begun to fade. But before he blacked out, he wrapped himself around her, squeezing her closer to him. And as he struggled to stay conscious, he only thought of one word: Mine.

When he woke, he was staring at a white ceiling. His body felt sore and heavy. His head felt even more so, but he sat up, trying to find his bearing while his hand rubbed his head. Moving had caused the sheet on him to drop to his lap. He may not know where he was at, but he knew that he was very nude.

"Sleeping Beauty is finally awake," a voice sang from a distance. He turned his head to the bed next to him to see a blond man laying down, reading a pervy magazine.

He groaned as he realized just who the man was. "Can you maybe not refer me to like that while reading that? It's disgusting."

Kisuke laughed.

"I don't think you have any room to talk after how we found you."

He blushed.

"We?" He asked, his voice hitching in embarrassment as his last memories started to catch up to him.

"To be honest, I don't know how I should feel. It's not every day that a father finds his son in such a…well, let's say a 'compromising' position," his dad said. He smirked while he added, "or positions, from the looks of it."

At the teasing words, he pulled the blanket up, covering his body and his face.

Of all the people to find them, why did it have to be his dad and his weirdo friend?!

Wait.

"Where is she?"

Both of the other males in the room looked entertained.

"What's it worth?" Kisuke asked.

He felt his temper flare dangerously.

"Your life, at the very least," he threatened.

Kisuke raised his eyebrow.

"And at the most?"

He rose from the bed, keeping the sheet in front of him as he stood. He then wrapped the sheet around his waist before maneuvering himself toward the blonde male. He hovered over the other before he grabbed the front of Kisuke's shirt, pulling him closer.

"You really want to find out?"

Kisuke laughed off his threat good-naturedly while prying off his fingers.

"Is this how you raised your kids, Isshin? Scary!"

"Hey, you can't blame that shit on me! He never listens to me!" His dad defended.

He felt more and more annoyed as they both ignored his original question.

"Someone better tell me where she is at, or I'll murder the both of you and make it look like a murder-suicide."

Both looked unperturbed by the promise of violence, but finally, his dad threw his thumb at his office.

"She's in there. She's resting," his dad explained.

He began heading over to the closed door.

"Woah, there, stud," his dad called. "You can't go in there."

"Why not?" His voice colored in anger.

"She's under observation," Kisuke chirped.

He swirled to glare at him.

"Why?"

"That's on a need-to-know basis."

"Do you have to phrase it like that? You know you'll piss him off," His dad chided.

He heard a sigh.

"Fine. She's being observed. But why can't I see her?"

Kisuke shuffled off the bed, straightening his lab coat.

"She's interesting, of course. But when you are with her, she becomes…downright intriguing. Ah, before you blow up at me, what I mean is that it seems like you triggered her rutting period. I need to have her in a controlled environment so she can recover and so I can confirm my hypothesis. Having you there will make that impossible."

Her rutting period? If that were true, that would make sense why he acted the way he did. An Alpha's rutting period could send any unbonded Omega into a forced heat. But Kisuke said that he triggered it…

He ran a hand through his hair in frustration at his confusion. He pulled at the strands as he realized that even more than the confusion he felt, he felt a burning need to be with her again. He wanted her, and each second away from her chipped at his sanity.

But he couldn't voice that aloud.

"How long will the observation take?"

His dad laughed.

"Eager to continue where you left off?"

He flushed.

"NO! It's just…I want to make sure she's okay," he admitted quietly.

Silence filled the air.

"If I'm to understand correctly, she's a new student here. And you've never met her prior?" Kisuke asked while rubbing his chin.

"Not that I can recall."

"Hmm. You met her yesterday, and she made you aroused just by her presence. Her rut, if that's what it is, should have made other Omegas attracted to her, but it appears that no one else has reported as such. Although that would explain how she reacted when," Kisuke trailed off.

He perked up at the pause.

"'When?'" he prompted.

"As soon as you passed out from the tranquilizer I administered, she became very hostile. She became very protective over you, and her aggression only escalated as I tried to pry you away from her. Normally, I am all for beautiful, sexy nude women throwing themselves at me, but this was an exception. Thank God, I had another dose to subdue her. You could be talking to a one-eyed scientist right now, you know," Kisuke finished.

"What a shame," he commented, secretly pleased with the way she acted. It almost seemed that she was feeling the same way he felt. Like she felt the overwhelming need and want he felt.

"You seem somewhat happy at her reaction. Like you," Isshin started only to be interrupted by a loud bang.

They all turned toward the office which held her. They saw her and her hand pressed against the door's sidelight.

When he laid eyes on her, he felt like he could breathe again. He felt the tension melt from his shoulders. He also felt the heat stir in his belly.

He began walking toward her until he was in front of the door. He tried the knob, but it was locked.

"Open it," he demanded quietly as he kept eye contact with her. He raised his free hand to press it against the glass. If not for the damned barrier, their hands would have been pressed against each other.

"Can't do that yet. Even from here, I can smell your pheromones. You are leaking them everywhere."

He believed him. At the moment, he felt as if he had a fever. He felt hot all over. He wanted nothing more than to touch her again, and with the way she looked at him, her cheeks stained red, he could tell she wanted the same.

"Open it," he tried again. "Please."

He barely heard the shuffle of footsteps.

"Isshin, I think that's a mistake."

His hand on the knob was pushed away, but before he could protest, he heard the distinct sound of a key sliding into its slot and turning.

Before he knew it, he was closing the door as she pulled him in the room.