Come here, child.

Shall I tickle you ?" "I knew you'd say that," Zo answered.
When men in general thoroughly enjoy the pleasure of talking nonsense to children, they can no more help smiling than they can help breathing.
The doctor was an extraordinary exception to this rule; his grim face never relaxed--not even when Zo reminded him that one of his favourite recreations was tickling her.

She obeyed, however, with the curious appearance of reluctant submission showing itself once more.

He put two of his soft big finger-tips on her spine, just below the back of her neck, and pressed on the place.

Zo started and wriggled under his touch.
He observed her with as serious an interest as if he had been conducting a medical experiment.