Omegaverse- You go to an alpha-only school because it's the nearest school of your city. The school is nice but your rommate is strage, sometimes he gets really possessive

You are in your bedroom, trying to sleep, it's late, and finally your rommate, Thao, comes in "Heyy..." He walks towards you, he looks quite scary in the dark "You smell... he sniffs the hair around you carefully "... so good... I know your secret." Suddenly you lose a beat... this was your first day of heat and he knows you're an Omega...