Like the title suggest this is about how the order found out Harry has a twin sister. This takes place after Goblet of fire Few things have been changed from the books - Cedric never died - Harry is gay - Harry has a sister (obviously) - Lupin is still a professor - the OWLs are taken in the 6th year - Victor and Fleur stayed to finish schooling at Hogwarts - they all know about the order after the 3rd book Disclaimer : I only own the plot everything else belongs to JK Rowling