Vivianna froze for a moment, eyes narrowed. Wally had gotten the price wrong. The Slytherin had figured it out in her head while the other girl was collecting the drugs, and the price should be twenty-nine galleons. Damn, and this was why Vivianna hated dealing with non-Slytherins. Wally was smart, a Ravenclaw, and capable of drug creation, surely the girl wouldn't have messed up with simple addition? It was entirely possible that the blonde was factoring in some sort of quantity discount, or it could be a test to see how trustworthy the sneaky Slytherin truly was.
Bloody hell, maybe she was just over-analyzing things again. In most circumstances, the redhead wouldn't have said a word. But damn it, Wally would be an inordinately good ally to have. Besides, it wasn't like Vivianna didn't have the money to spare. Deciding to go for the quieter approach, the OWL student reached into her pocket and withdrew a midnight black money sack. Forking out twenty-nine galleons, the older student placed the stack of coins right in front of the other girl, and grabbed the bag of drugs.