(ABO-OMEGAWERSE WORLD) It's rare for an alpha to go through a heat but it seemed like Tobirama was going through one. It happened when he was in his office and working all of sudden he felt his whole body heating up and felt a sudden need for his mate izuna.

Although izuna wasn't an omega so based on information about alphas, the best mate for easing an alpha's heat is an omega, then an alpha and in the end a beta. Betas were the last in the list because it seemed like they wouldn't help easing an alpha's heat.

But Izuna was a beta, he couldn't ease Tobirama's heat or get pregnant like an omega. Tobirama knew all of that and he still loved izuna. He never felt more care and love toward anyone, even the greatest omegas he met. Izuna always was the best for him.

...

He opened his eyes and saw izuna's uncovered body beside him. His mind started to work and he panicked as he saw blood under izuna's down body on the sheets. He remembered what he did as hashirama took him home. He used izuna, hardly, more intense than izuna could bear. He did it many times, each time more intense.

He quickly and almost shouted izuna's name and turned his body around cautiously as if izuna was glass that could break in his hands. "IZUNA"

his mind raced with self-hatered. What did i do? What did i do to him omg...damn it...damn it...damn it...you stupid asshole...how could you do this to him...omg...omg