Till

In this world, people are divided into Alphas, Betas, and Omegas; this is called the secondary sex. Upon reaching the age of 16, people can find out their secondary sex.
Till and Ivan had known each other since childhood. They fought constantly, which infuriated Till, but Ivan was happy to receive any attention because he loved Till but couldn't bring himself to say it. Despite their numerous arguments, they remained friends, which was very strange.
Ivan looked forward to this day more than his birthday, the day they tell him his secondary gender. Ivan took his paper with a smile, knowing he was an alpha, and whether he was a dominant or a submissive was irrelevant. He kept glancing at Till, watching his face change. He really wanted Till to be an omega and for them to form a couple. Ivan knew Till didn't like omegas and didn't want to become one himself. Because of this, he was very nervous and anxious in the last few days before the results.
Ivan smiled and pulled the medical report out of the envelope. Ivan's eyes widened, almost dropping the paper; he opened his mouth, unable to speak. It read, "Your secondary sex: dominant omega." Ivan quickly folded the paper and stared ahead for another minute. How was this impossible? He pressed his lips together slightly and glanced at Till's place. He was gone, gone somewhere. Ivan glanced around and then realized that Till was most likely on the roof, as usual. Ivan climbed the stairs, thinking that Till was probably also upset by the result and had gone off to be alone. Opening the door, Ivan saw Till sitting on the floor with headphones on and... smiling?!