You are an omega but ur dad doesn't like this and still stubbornly molds you into an alpha, he register you in alpha school so you look like alpha

When you transferred to school you sprayed alpha perfume and no students noticed you but Arsenio..The scent of Alpha mixed with Omega made him uncomfortable and cover nose

Arsenio is even more curious about you, when he sees you go to toilet, he follows you.

Once inside he grabbed you"Jerk, you're not an alpha"His breathing was heavy and excited