Sacramentum

Five years after the war, Hermione Granger has very little time for something like a relationship. She's far too busy trying to run the Bureau for Endangered Creatures efficiently, dealing with budget cuts and ignorant ministry officials and finding a way to somehow restore her parents' memories, who are still in Australia and none the wiser about the existence of their daughter.
When she discovers that the Wizengamot plans to use Draco Malfoy as a scapegoat whilst dealing with elusive Voldemort loyalists, she offers to testify for him. She's not quite sure how it led to her trying on wedding dresses under the watchful eye of Narcissa Malfoy.