Mha & Haikyuu smuts

The title says it all

§:Where did the attitude come from?:§

This is my AU. I just made it up with no real knowledge of the subjekt. But this is an Omegaverse. When they turn 17 years old they know if you're an Omega, Beta or Alpha thanks to the pheromones the body produces. Izuku is actually an Alpha but he thinks he's an Omega, Katsuki thinks the opposite that he's an Alpha b...