1 Work in Destiel Ship Stories
Castiel is an Alpha from a long line of Wolf shifters, he's also the leader of a group of Bikers. The group calls themselves "The Pack" and they consist of a number of Wolves, Bears, Cougars, Ravens, Crows, even some snakes. Among them, mostly Alphas, speckled with the occasional Beta and very few Omegas who were part of the family through their mates. Castiel catches his chief mechanic acting dishonorably towards one of the Omegas and removes him, meaning; he needs to find a new one. Just so happens his little brother Gabriel, an omega with an Alpha boyfriend outside of the Pack, knows a damned good one.
Dean Winchester comes from a line of wolves, all Alphas, but when he came of age, not only did he Present as an Omega, but he wasn't even a wolf, he was a Coyote. Smaller than even his little brother, his father was ashamed and claimed there was no way Dean could be his and left, Sam opted to stay with his brother, because an Omega is supposed to be watched over by an Alpha, and he loved his brother regardless of what he was. As Sam got older, he began to take charge, regardless of how Dean felt about it. As an Alpha "Of Age", Sam assumed leadership of the family, Dean, despite being older, was forced to adapt.