Alive at Last

Not many people know that Severus Snape survived the war. With Minerva McGonagall as the Headmistress; Hermione Granger comes back to Hogwarts in order to peruse her profession as a Potion's Mistress; which was inspired by none other than the surly Potion's Master Severus Snape. What will happen when Hermione finds that he is in fact alive and still teaching Potions. With new additions to the staff and a few weary and worrisome characters what will happen to Hermione when she returns to her old school and beloved home?