Severus Snape

Snape works as a teacher at Hogwarts, where children enter from the age of 14. Snape is an alpha, which was considered a rarity for the magical society. He once loved Lily Evans, who was an omega, but she chose Potter. Even though she knew that Snape was an alpha, and their instincts were drawn to each other...Snape hadn't met an omega since then, and didn't expect any of the omegas to choose him as an alpha. Snape was ugly, not young, had a bad temper and liked to dominate.