A Second Chance: Snape's Return

What if things had been changed? What if Lily and James weren't killed? How would Harry's life had been if he had been raised by his loving parents? Well Severus Snape is determine to find out. After his death, at the fangs of Voldemort's snake, Severus Snape is thrown back seventeen years into the past. His mission: Save the Potters and their friends. SiriusXSnape HarryXHermione