Faded Parchment

When a boy from a wizarding family meets a scared girl from a muggle family on the Hogwarts Express, he breaks his family's tradition and makes a deal with the Sorting Hat, entering Slytherin instead of her. Four years later, they are in their 5th year, and both are settled in their houses. A series of coincidences sparks a lifetime of events between the two, and a new romance.