Because I love you

In a world where Albus Dumbledore destroys Voldemort, just as Lily and James came out of their last year of Hogwarts, things are different. James, horrified by what he has seen in the war, leaves Lily suddenly without any warning. Now, 10 years later, he turns up on her doorstep, on her wedding anniversary."The course of true love never did run smooth." James mumbles. James/Lily AU