Prologue

After various of experiments, the society of the world changed. And the second gender was created. People was split into three different kind of second gender.

At the bottom of the pyramid are the Omegas. Only 10% of the population are tested as omegas. They release pheromones that attracts the alphas. They went ito inconvenience called Heat where they unconsciously release their pheromones as it risen their sexual drive. Their heat lasts at least 3-7 days. Most of omegas are physically weak and dependent.

At the middle of the pyramid, are the Betas. The betas have the 70% of the world's population. They are just ordinary people, they don't smell Alpha or omega pheromones. But there are cases of Betas that release faint arousal pheromones with unique smell that only selected Alpha or Omega can smell.

Finally, an Alpha who consumes 20% of the population. At the top of the pyramid, unlike omegas, they are strong physically. They are the mighty ones in the society. They can be affected by the Omega's pheromones and get a sexual drive. They have certain inconvenient called Rut, their sexual drive risen at a time like that. It lasts to 3-5 days.

Other things in this Omegaverse;

Permission- an Omega, Beta and Alpha can't do anything to a certain person, except kissing, without the other party's permission. Unless they ask and have their permission to do so. To be sure they were given permission, the person being asked should answer "Permission Granted".  (But its like a two edge sword. When an alpha, beta or omega are already on the move without permission, they'll feel an unbearable pain.)

Collar- Omegas wear this especially when they don't have a partner. It is to prevent bonding between an omega and an alpha.

Bond- it is when an alpha bite an Omega's nape and vise versa.

Breaking bond- to break bond another willing alpha is to bite the omegas wrist to break the bond on another party. (But some just commit su!c!de or crime to break unwanted bond)

"Ahh~ Kuroo...san!"

"Sshh. It'll feel a little good after a while." Osamu caress the latter's head as he played with his nipples.

"Ahh~ not there!"

"It'll be fine. Hmm~" He kissed the later to until the two are out of breath.

"Enjoying his fresh mouth without me, Samu?" Kuroo wiped his mouth and crawl on top of the blueberry-haired then reach for his lips. "What did you eat for dinner, Tobio-kun?" He smiled as his eyes filled with lust stare onto the erotic face of the blueberry-haired.

Kuroo's hand began to travel down the latter's hole and began penetrating it using his fingers. Kageyama's face was lifted and there was a waiting shaft that was longer and bigger than his.

"Care to help me out?"

Kageyama opened his eyes like he was woken up from a nightmare. He felt breeze touches his body but he couldn't move an inch. His body aches and felt a little numb. He roams his eyes and notice that it isn't his room.

"Ah. You have awaken."

His eyes went on the direction of the voice and saw the two alpha holding a tray of food.

"What happened?" He asked in confusion as he don't seem to remember what happened.

The two alphas looked at each other then back to the latter and smile.

"I wonder." They both said in unison.