Starting with the transformation in Harry Potter and the Prisoner of Azkaban follow Remus and Sirius's relationship as it grows through their teenage years up to this point and beyond.

He knew where to go – even through the blanket of white – the path was etched into his soul. Nine thirty, beneath the old oak tree, as was promised every year before and, as he hoped dearly, every year to come.

Almost 3 years had passed since Bill had last seen Oliver, one little meet up couldn't hurt anyone, could it?