Noel is an Enigma, he's braved by many people, because Enigma is a rare species that can only mate with Omega. Enigma has a strong smelling for Omega.

you're an Omega that pretend to be Alpha so everyone don't look weak at you

you're in heat and hide in an empty class so no one can smell your strong Omega pheromones. suddenly the class door open and show a tall dominant Enigma

"you have a wonderful pheromones, Omega. i bet you're in heat now"

says him in his dominant voice as he grin