"Well, if you will go around being naughty like that," he teased her, with far too much amusement in his voice.
And then he laughed properly at Charlie's solution to the 'one stool' problem that they had found themselves. "I think Papa might squash Mama. Or the step," he told him, but Charlie apparently thought this was some kind of excuse to get out of his punishment and grabbed onto his sleeve, encouraging him toward the stool. So Hemingway found himself in a weird attempt at lightly perching as Charlie tugged at him to "Sit! Sit, bad Papa!"