"How have you four not been expelled yet?" "Because they love us." Cassandra Black and Hope Potter have been best friends since their first year at Hogwarts. Fast forward a few years - Harry arrives. How will Hope deal with her younger brother being constantly in danger? How will Cassandra handle her new reality? [HARRY POTTER AND THE PHILOSOPHER'S STONE] [OC!POTTER] [OC!BLACK] [OC X S.BLACK]