yuno x asta omegaverse [Short story]

In this world when a person turns 18 a mark appears on their wrist to show their secondary gender. A ➰ for omega. A ✴ for alpha and a ❇ for beta. you also don't give off a scent till you turn 18. Yuno and astas 18th birthday is coming up and since their birthday is the same day the black bulls decide to make it a join...