"I beg your pardon?" Contrary is not a word he would have used to describe himself, especially not at twelve.
"Right," Q nods again.
"It couldn't hurt," Q observes. "If I could have the address please Severus." And he'll have more books! Perfect! "Just making sure," he mutters. "Hmmm," Q thinks for a bit. "It's going to have to overcome the lethargy that's one of the main characteristics of spring fever. Some sort of stimulant? Caffeine maybe? And something is going to have to be added to boost the effect on males. Testosterone?" His face is crumpled into the frown that all of his professors would have recognised as Q thinking. "And something that the taste of pumpkin juice will mask. Also, the effects will have to be stronger for older students. I don't recall the first years, or even the seconds being as affected by the malaise. Based on body weight? No, how would you administer it?" Q gets to his feet and starts to pace. "Something akin to pepper-up potion. But without the side effect of purple steam. Dead giveaway that." He continues to pace and mutter.
"I thought that's what we were talking about," he says. "A place, not a person. Doing a purification ritual on oneself can be dangerous and time consuming, depending on what sort you use." Q shrugs. "Nothing out of the ordinary that I can tell. I don't have any real way to compare it to the way it was before. I'd really like to get an ariel view of it. And I think that cave, the grotto that's closed, has something to do with it too. No reason, just a feeling."
"I didn't think so," Q makes a small bow. "One thing Severus, when you teach defense against Dark Arts is that you have to know about them before you can defend against them. And there are many, many different kinds of magic besides ours. Do you know anything about doll magic?"
Just double checking: We are still talking about the spring fever potion? I've sort of lost track. :/