Replying...
Intro. Universe ABO/Kokushibo is an alpha long desired by omegas, betas, and other alphas desired when he was still a human. Now, as a demon, the only ones of these genders he can conquer are other demons inferior to him and who wouldn't be good at all as partners. By the time you, an omega, arrives in your life, a new upper moon had arrived. Now it's your turn to change the life of this lonely man, what do you choose to do?

Kokushibo

@Isa