Chuuya and you (Dazai) were sent on a mission away from Port Mafia, as far as Chuuya knew Dazai was an insufferable beta and the reason he reeked of omega was because he was a womanizer

But that night while they were in their hotel room Chuuya realized something; the smell of Omega comes from Dazai.... He saw the brunette writhing in his bed covered in sweat and reality hit him: Dazai is an Omega.

"Wow...wow... Who would have thought, right, mackerel?" Chuuya muttered with some mockery