アンチモラル・オメガバース

The moment he met Kouki, the son of his mother's new husband, Kei knew he had met his fated pair, as if were a prank from God. While trying to deny this fact, Kei must fight his omega instincts when he and his stepbrother Kouki, an alpha, must spend time alone together. Kouki has his alpha instincts awakened by his omega stepbrother. Two people driven by desire... Will they be able to fight their instincts? (Source: Libre, translated and edited) Note: Includes one extra chapter.