Lab Coats and Wizard Robes

It's years after the Dark Lord was defeated. The wizarding world is at peace again, but a new evil seems to be lurking at Hogwarts. Student after student files in at the Hospital Wing, and Madam Pomfrey, unable to stem the epidemics, consults Professor Dumbledore. He turns for help to one of his most trusted employee. Will he agree? Will he succeed? And by the way, what's hydrochloric acid?

An epidemic is spreading at Hogwarts, and Dumbledore has asked Snape to brew an antidote. But when he goes to the library to find the recipe, he realizes that it will not be as easy as he thought.

Now that Snape knows what hdrochloric acid is, the question is: where can he find it? Guess who he asks? Why, the One who Always Had an Answer, of course!

Snape gets to the Analytical Chemistry Department. His quest will be less easy than he thinks. AU since HBP.

Snape gets back to Hogwarts. He's starving. Will he be able to eat in peace? AU since HBP.

The last chapter. Harry's not the only one who gets an interview with Dumbledore at the end of stories... AU since HBP.