"When one wizard saves another wizard's life, it creates a certain bond between them..." -The Prisoner of Azkaban. Harry didn't know why he decided to save Draco's life that night, but all of a sudden Malfoy was indebted to him, and it seemed Draco wasn't going to leave him alone until that debt had been repaid. ***Takes place during HBP, spoilers for all books before. Some plot differences. All characters belong to JK Rowling***