The Adventure Starts Here

A 33-year-old witch is patrolling a small Muggle community looking for young witches and wizards. She sees a young half-blood boy being abused by his father, and watches over him. Three years later, she personally delivers him a Hogwarts acceptance letter, and a lifelong friendship begins. This is the story of how Minerva McGonagall met Severus Snape. One-shot.