By the time the piano lesson was ending, Annabelle had a headache; Lily Bonham was a very bright child, but she was also a very indulged child. Luckily for everyone, indulgence did not encourage a native spite, but rather a native impatience, a desire to skip the preliminaries and move straight to the action no matter how important the preliminaries were.
In this, Annabelle supposed, Lily resembled her father. Lily assumed sitting down at the piano and making her fingers look like they were playing would be enough to assume familiarity with the keyboard. Bonham was assuming familiarity without preliminaries, too--but with Annabelle herself, not the piano. That presented some serious difficulties.