[Harry Potter] Walking by Day in the Dark

Originally titled White Night and Black Day. I deleted it for some reasons, but now I'm revising and reposting it, and will slowly fill in the plot holes.

Margaret was born into a Pure-blood wizard family.

She has loving parents and a close relationship with her biological older brother.

Later, she meets many people and learns that the gifts of fate always come with a clearly stated price.

Reader's Guide:

1. Two male leads: the Professor and Tom. The latter appears very, very late.

2. Everyone loves the heroine; she's a total Mary Sue.

3. Breaks up the canon couples James and Lily, and Harry and Ginny.

4. An apology to everyone who followed this story before.

Theme: The past cannot be reclaimed.