"All done?" Lupin lay on a small white bed in the Room of Requirement, a foul medicinal taste lingering in his mouth.
"More or less for your human form, but I haven't studied your werewolf form enough." Will shook his head and set down his Quill. On the Parchment in his hand, he had drawn several human figures, each marked with intricate paths of Magic. "I'll need at least two more full-moon experiments."
"You make me sound like a Guinea Pig in a Muggle scientist's lab, or a corpse Victor Frankenstein dug up." Lupin let out a long breath.
"I didn't know you read science fiction, Lupin." Will put down the Parchment and poured Lupin a glass of warm water. "Rinse your mouth."
"Muggle books can be interesting. At the time, I wondered if the author was a Squib, coming up with something like that." Lupin sat up and took the glass. "Ugh. This stuff tastes awful."
Will rubbed his forehead. "Apparently, the original Wolfsbane Potion didn't taste this bad. But when Professor Snape improved it, he went out of his way to make it unpleasant."
"..."
"Sorry, Lupin, but you'll spend most of this Christmas holiday being studied." Will wanted more than ever to adjust the Time-Turner and learn the Hour-Reversal Charm. For now, while keeping things safe and avoiding problems with time, he could only go back ten days at most. That was nowhere near enough.
"The students are all away for Christmas, and I had nothing else to do. Isn't this perfect?"
"Taking Wolfsbane Potion when there's no full moon isn't good for your body, even the improved version."
"It's fine, Will. If you can turn the Wolfsbane Potion into a Werewolf Venom Curse, it'll be the best Christmas present I've ever received. As for that little