Ω no Kashoku: Kyoumei Renjou

As the heir to the prestigious Kuou family, Iriya was born an Omega into a household of Alphas and raised to be prouder and more superior than even an Alpha. Blessed with breathtaking beauty and magnetic charisma, he has become the talk of high society. One night, he and his childhood friend Keiki receive an invitation to a party hosted by the Uryuus, a distinguished family of Omegas. There, an encounter with "him" stirs a strange change within Iriya—who, despite being well past the age of eighteen, had never once experienced heat. His body begins to burn as sweet pheromones spill from him—?! "If you want help, say so."