Hizamazukasete, Ore Dake no Omega

This is the secret love story between an alpha servant and an omega heir! Ayase is an heir to the prestigious Miyanosono family and he lives while hiding his omega gender. Shinogu is an alpha servant of Ayase's who helps to protect that secret and in his devotion to Ayase, he even sleeps with Ayase when he goes into heat. Meanwhile, Ayase is actually in love with Shinogu...