"A maid? What would I do with one of those?"
Isaac gave his older sister a strange look before saying, "This book is actually quite interesting. The spells and magic used to corrupt the princess have a lot of practical combat applications. Take this one, for example."
As he spoke, Isaac flipped to an earlier section and pointed at the text. "It describes a spell here. The effect makes a person's body extremely sensitive, to the point where the slightest friction from their clothes will make them climax. If you hit an opponent with a spell like this during a fight, they'd be instantly incapacitated!"
"..." Watching the deadly serious Isaac get worked up over this, Cheryl fell silent for a moment. 'Could it be that I'm the one with the dirty mind?'
"That kind of Magic is pure fiction. People in the Association studied it long ago and have already debunked it. I'm pretty sure I have the relevant papers in my library. Haven't you seen them?"
