Sparkle's Quest, Samuel's Journey

Samuel is a dark pony. He lives in the darkest parts of Equestria, banished by the princesses, forgotten by everyone. Sparkle Shimmer is a young princess-in-training, on a final quest to bring goodness to the darkest part of Equestria. What would happen if these two Alicorns met? Unknown to each other? Sparkle has to find a way to bring him happiness, but is Samuel ready to become good?