Two Flowers of Utmost Difference

When a strange man apparates into her kitchen, Petunia doesn't call the police. Instead, she takes up that man's offer, which will end in reviving her dead sister. What seems like a simple plan ends up in Petunia in a back alley trying to trade troll toes for a time traveling clock! And can she avoid being driven insane by the annoying but sadly attractive Severus Snape?