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?
(Source: MU)