Instructions for consumption: James has no difference/mutual attack. The setting is that James and Lily broke up. A few years after graduation, Snape got tired of his life as a Death Eater and joined the Order of the Phoenix. Without that Halloween, the war continues (but this article itself has nothing to do with the war), and the enemies of the past have to learn to fight side by side. Then he and James fell in love, and then they seemingly broke up, and that's what happened after that.
Rowling deserves everything she deserves.
Intention: None