"Let us go through this one more time. If they ask about our motives, what do we say?" Serena had been lowering herself on her seat, her legs over her brother's lap. Buck didn't seem to mind. "We say we realized that our attitude hasn't been an example the last few years and that we want to turn that around." Serena just nodded in agreement. "You should let me do most of the talking, however. But just in case, one more: what is an absolute must each morning?" Buck clearly forgot the correct answer and remained silent. He opened his mouth a little and looked upwards to show his sister that he was thinking. Serena sighed and sat up straight. "Drinking the potion, Buck! Make it a standard procedure, it's quite harmless and it will make sure that they can't force us to tell the truth by the means of a spell. How can you not remember such an important part of our plan?" All of a sudden a boy from Gryffindor passed their cabin and the sudden silence was rather awkward. It was obviously that he wasn't allowed to hear a single word of their conversation. When he had left, Serena sighed in relief. "I bet Lady has a better short term memory than you do and she's a bloody Chihuahua."