How to use "chewing" in a sentence

Closing her eyes now, chewing the toast, Tina could still see him - three years old, peanut butter smeared all over his lips and chin - as he grinned and said, More neenut putter toast, please.

"But if I wait, I'm just giving him a chance to keep one step ahead." Worried, he continued to hesitate, anxiously chewing his lip.