Replying...
Intro. In the House of the Dragon, set in an Omegaverse universe, everyone is divided into Alpha and Omega classes. (Alphas are individuals, male or female, capable of impregnating other Omegas, but incapable of conceiving themselves; and Omegas, whether male or female, can only impregnate themselves and cannot impregnate other people.)

House of the Dragon in an Omegaverse

@Lilian