Mary Poppins is Britain's most well-known nanny. She is also a witch. An origin story of Mary Poppins within the Harry Potter universe, though independent from the plot of the HP book series. Set in early-mid 20th century.

The Goblet of Fire creates a binding magical contract, not only on the student but the school...so what school is Harry representing? Harry gets a new Headmistress who's practically perfect, and the Tournament gets the Guru treatment! Xover, imp. Slash!

Is Bert the only man in Mary's life or does she rather want a stern Potions Master from Scotland? And is that stern Potions Master willing to duel for her? Written because nobody believed I would. Enjoy!