It was about an omega who was pretending to be an alpha (or it was believed by everyone that he is an alpha), working with a bunch of alphas, and he was really strong and buff (i think the strongest at the company), I think it was physical labour. He goes into heat one day, and one of the alphas notices and they have sex, but they don’t really like each other. They end up actually dating I think and the omega is pregnant.
The omega had sort of greyish purplish hair, he was more buff than the alpha I think, the alpha had either red or black hair.