He quickly moved to sit behind his desk, keeping a safety distance from the other, he had always been wary of the other wizard after the incident on their fifth year of school, he really didn't want to be close. His dark eyes settled on the werewolf as he spoke, they took in the words, they considered the words, Lupin was being brief as he had asked.
"Wolfbane... you say..." he muttered, and long pale fingers tapped on the table as he thought about the whole thing, he had just read an article about it, it was extremely interesting, and some of his own researches had been essential for the developing of the potion, so it was something he knew very well.
He laughed bitterly at the request: "You want Me to help you?" he asked, and pushed the chair away from the desk again so to stand up, walking towards his book shelves, wanting to see the last volume of the magazine that printed the potions' instructions. He watched over the list of ingredients when he found it, they were all quite hard to find, not many potion master could get a hold of those kind of things.
"I'm sure you didn't come here to simply ask me a favour... what... do you have to offer?" he asked, no one would ever come to him counting on his goodness, right?