Cessie's Study==>Cessie's laboratory
"Indeed, I have used a few test subjects already though."
Her sometimes-idiot for a husband for example.
The sorceress unlocks the door to the lab and let's Agatha inside. "The apples is in the cupola over there. I only got a few left but I'm growing more in the greenhouse outside."
She explains before opening the cupola to hand over the apple to her would-be assistant. "I already have a few ideas how to counter react it but it's rather dangerous to handle so all alternatives are welcome."