Katsuyoku Scandal

Overview

College student and model, Sari, is really an Omega, but he hates it so much he's decided to live as a Beta. One day, his manager (and older sister) asks him to scout Taiga, another Beta at the same school for a pair modeling session. The two hit it off from their first meeting and celebrate the end of the shoot. Sari feels comfortable with Taiga, but under some intoxicating force, he goes into heat from Taiga's smell. Although he thought Taiga was a Beta, it turns out that, just like Sari, he's also been hiding his real sex and is actually an Alpha...!?

Source: AniList