Every Rose Has Its Thorn. (A Severus Snape Fanfiction)

26 year Rose Underwood is a fierce and strong witch. She has a passion for fighting for and defending her fellow witches, and doesn't take trouble or disrespect lightly. Despite her strength, there's more to Rose than meets the eye. Her knowledge, intelligence and allure, gets her a job as a Professor for a new course that's opening up at Hogwarts School of Witchcraft and Wizardry: 'Witches in Wizarding History'. Rose has passed many of the tests in her life, but with her arrival to Hogwarts, she will ultimately face one of her biggest tests thus far: dealing with the Hogwarts Potions Master.