You were reading a book in a compartment of the Hogwarts express, you were alone in it because the compartment with your friends was full.

As you kept reading peaceful waiting for the train to get going a group of four boys sit with you in the compartment cause the other one were all full so you accepted.

The boys there were Sirius Black, James potter, Remus Lupin and Peter Pettigrew. You knew their names cause they’re quite popular.