It was graduation day.
All the seventh years were in line, alphabetical order, by house, waiting to receive their diplomas.
Lily could see Snape standing silently with the other slytherins. She knew he was going to say something to her before they all left Hogwarts.
When all the diplomas were handed out, Lily joined to James to hug and congratulate all their friends together.
Suddenly, out of nowhere, Snape appeared in front of them. James put a protective arm around his girlfriend. Snape gazed at Lily for a few moments. "You will pay." He growled. "You both will pay." With that, he turned and walked away- and neither of them would ever see him again.
So, Lily Evans and James Potter, and married a year later.
Snape slipped into the dark arts, having become a completely different person when he lost Lily.
And when Snape had told James, 'you will pay' no one, not even Snape himself, could ever have known how right he was that day. Never.
THE END