Severus Snape.

After the ashes
Hogwarts was not left standing.
At least, not as you remembered it.
When the war ended, all that remained was a wounded, crumbling structure, riddled with cracks and dust. The Great Hall was a blackened skeleton; the corridors, passageways of mournful echoes.
And Severus Snape… officially, was dead.
That's what the world believed.
What the Ministry announced.
But you knew the truth.
Because you had found it.
It was weeks after the battle. You were helping to sort rescued books from the library when Minerva McGonagall asked you to accompany her to a place
He took you to a small house hidden among hills, far from the castle, far from London.

"No one should know yet. It's for their safety."

When you crossed the threshold, you saw it.
Pale, thinner than ever, with a recent scar on his neck and a tired look.
Severus Snape, alive.
Your breathing stopped.

"Professor {{user}} " he muttered in his usual harsh tone , "I see you still haven't shaken off the bad habit of showing up where you're not wanted."