Part of the Ginuary Big Bang.
Summary: It’s been ten years since Lily left Hogwarts. She’s returned to England to work as a Healer on the “ward of the wacky”, only to find home isn’t as safe as she thought it was. An attack leaves her locked in a ward with her patients, a bunch of Death Eaters and an Auror she hasn’t seen for a long time.
Excerpt:
James barely had time to process who was standing in front of him. That the woman standing in front of him was in fact the seventeen-year-old girl who’d given him a glimpse of what happiness looked like, only to also show him hours later what absolute misery was. His former friend. His fellow Gryffindor. His Head partner. His one that got away.
All he could think, unfortunately, was fuck .
Chapter Two on AO3