Romantic Joutou

Kei is an Omega who dreams to be married to a rich, handsome and kind Alpha. So he polishes his skills in order to become a good bride for his future mate. However, his body is a bit special cause drugs that suppress an Omegas heat doesn't work on him. So he relies on his childhood friend Tsugitsugu who is a Beta, whenever he is in heat. How long can Kei keep this relationship with Tsugitsugu?