The Seven Lives of Lily Potter
7 parts Complete Severus often wondered why he had survived Nagini's bite. He had imagined no future for himself beyond Voldemort's death, had laid no plans, had made no Will, had left behind no one to mourn him, and yet he endured. He had done things with his life since to justify its continuation, certainly - but none of it mattered. None of it had meant anything. He had only been filling the years until now. This moment. He had failed Lily Evans and he had all but sent her son to his death like a pig to the slaughter when he had sworn to protect him. But he could save Lily Luna Potter.
Twenty years after unexpectedly surviving the War, Severus Snape finds himself once again embroiled with the Potters when young Lily Luna dies - then dies, and dies, and dies again.