Omegaverse

A normal yankee got transported to an omega verse world

Kaede (alpha) saves Azusa, an omega that was being bullied, and moves to another city right after. Many years later, they meet again and Azusa says that he wants to pay him back and that he'll do anything if Kaede gives him a chance. Fortunately or unfortunately, playboy Kaede just can't reject such an opportunity of amusement.