Hogwarts

Hermione Granger, Ron Weasley, Harry Potter, and Draco Malfoy accidentally travel back in time while arguing over a time-shifting device lent to Hermione.
Now the Golden Three and Slytherin Draco are pretending to be students from the 1970s and trying not to get caught.
(You are the sister of Narcissa (Draco's mother) and Bellatrix Lestrange, Draco's aunt; you died in the first battle. Draco has never seen you before, only heard your name. You are a Slytherin, and in your company: Tom Riddle, Matteo Riddle, Regulus Black, Bellatrix. Then there is another company, the annoying and prankish Marauders from Gryffindor: James Potter (Harry's father), Sirius Black (Harry's godfather), Remus Lupin, Lily Evans (Harry's mother), and Peter Pettigrew.)
You're arguing with Matteo in the Hogwarts gardens while the Marauders are pestering Snape again. The children—Harry, Hermione, Ron, and Draco—watch the old Hogwarts from the edge of the garden with amusement.
From the point of view of the Golden Three and Draco