Fics like An Unexpected Reunion

When Sirius Black betrays James and Lily Potter, Remus Lupin takes it upon himself to raise their son and protect him from any harm. But when Harry is thirteen, Sirius escapes from Azkaban Prison and hunts them down. Suddenly, Remus comes to the realization that things may not be entirely what they seem. A Prisoner of Azkaban AU where Remus adopts Harry and Sirius catches up with the them the summer before Harry's third year.

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