Half-awake's manga / #Alpha x Omega(3)

Omega works at a coffee shop, has a crush on a regular customer who's an elite, moody alpha. One day, he runs into him in the street and it triggers his first heat at 26 years old. The two have sex but the Alpha, disgusted by the Omega population, declares that it will only be a one-time thing and for the omega not to get his hopes up.