Resurrected and Reunited (Harry Potter)

James and Lily Potter have been dead for 12 years, both falling victim to the killing curse by the hand of the darkest wizard of all time. Their son, Harry, remains the only wizard known to have survived the killing curse. Having grown up with his Aunt, Uncle, and cousin, he never felt like he truly had a home until he went to Hogwarts.

One night, however, in the middle of Harry's third year at Hogwarts, the impossible happens. His parents awaken in their coffins.
They manage to dig themselves out of their graves, and decide to find out what happened to their son. Is he alive? Is he dead? They have no idea.
They find out he is alive, due to the plaque outside their house, which has remained untouched since the night they died. Once they figure out what date it is, they seek out Dumbledore, as they believe he will lead them to their son.

How will Harry react to finally having his parents back? What will he do? And how will the rest of the wizarding world react to having two people, who have been dead for over a decade, rise again?

NOTE: This story is set in "Harry Potter and the Prisoner of Azkaban"
It uses both references from the book and the movie.