Casey White loved James Potter. She sent letters to him once, maybe twice a month. Her love for him started in 3rd year, so did his love with Lily Evans. She knew they would probably never be together. But she dreamed they would.
The end of sixth year is approaching and lily is still trying to deal with her feelings for James. James is still trying to win lily over. But so is Severus. Read as lily James and their friends finish up their time at Hogwarts.