A Marauder's Choice: The Early Years

What if Sirius had taken his oath as a godfather seriously and put Harry before revenge? This AU story has several OC characters intermixed with the character's we know and love. Slytherin!Harry, Grey!Harry, Harry/Daphne, Draco/Hermione Throughout the story I will be alluding to a major plot twist later, so if you catch it, let me know!