Her round soft face, which had been voluptuous and inviting a few months ago, had already put on the barrier of pregnancy, the self-sufficient smile, the knowing perfection-look; and her plump body—full soft breasts and stomach, hard hips and buttocks that had swung so freely and provocatively as to invite slapping and stroking—her whole body had become demure and serious.
There are no more uses of "demure" in the book.
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the shy, demure, innocent type
The fire in her eyes belied an otherwise demure countenance.