I remember that they met in college, one was the heir to a family where they have a special constitution where they have pheromones to seduce everyone and the uke acted like he wasn’t affected and became a secretary to stay by his side. It’s not omegaverse and the first manga was about the younger brother being brought back to the family and learning about this and his caretaker knew him when he was young but he didn’t remember and thought he was just acting for the family (also yaoi). And the mother is actually still alive and left the family because she didn’t want her son to be like the father (I’m not sure if she realizes about the pheromones just that the father had tons of partners)
I remember that they met in college, one was the heir to a family where they have a special constitution where they have pheromones to seduce everyone and the uke acted like he wasn’t affected and became a secretary to stay by his side. It’s not omegaverse and the first manga was about the younger brother being brought back to the family and learning about this and his caretaker knew him when he was young but he didn’t remember and thought he was just acting for the family (also yaoi). And the mother is actually still alive and left the family because she didn’t want her son to be like the father (I’m not sure if she realizes about the pheromones just that the father had tons of partners)