"There have been visitors," she said, every muscle writhing under her skin at once.

The muscles under the skin of Salt's face writhed worriedly.

The muscles of his arms writhing, he let go of the timber at last.

His muscles writhed at each tap of the hammer, but he never moved his body.

The red light from the windows played across the king's colorless face; muscles writhed beneath the skin like worms.

Muscles writhed like river current beneath his stony skin.

He saw the other's face twist in surprise The muscles in his shoulders writhed easily.

She shuddered, her back muscles writhing in sympathetic reaction.

The Rigelian didn't say anything for a while, though the muscles writhed in his ridged temples.

"The alien has done it," he said, muscles writhing, and Captain uttered a biological expletive.