What Could Have Been

Severus Snape wakes up in an unfamiliar bedroom. A woman obviously lives in it. The pillows smell like Lilly Potter's perfume. The dark mark has vanished from his arm. He walks around. Lilly Potter walks through the doorway and tells him she's his wife, they have children together and he was never a Death Eater. Has everything past his years at Hogwarts been but a dream?