The Rogue Prince Is Secretly an Omega

Prince Étienne de Frederick was born a dominant omega. However, in a world where omegas are barred from becoming emperor, he must masquerade as a beta because of the empress's greed. When his childhood friend, Grand Duke Rishar von Eckhart, returns after three years as a celebrated war hero, there's no time for a joyous reunion. Rishar, a dominant alpha, is now Étienne's rival in the struggle for the throne. The two maintain a fragile relationship until one day, Étienne unexpectedly goes into heat, and Rishar uncovers the truth.