Getting my hogwarts letter

Megan Nott is a pure blood from a family that believe in the pure blood mania. But she is also Sirius Blacks childhood friend, she like Sirius is very much different from her family. What will happen when she starts to realize she's falling for her best friend.
*disclaimer*
I only own Alyssa and Archer Nott, Sammie Hale and melody prewett are also oc