The lips writhed, as if speaking was an incredible effort.

His lips writhed in a silent effort to gain speech.

His eyes were still wide open but although his lips writhed, no sound came from them.

His lips writhed in a silent snarl, but he said nothing.

Matt's lips writhed back in a shriek, but no sound came.

After a minute, his lips writhed back from his teeth.

His lips writhed, as if in distaste, but he brought a paw up to take it from her.

Emerson's lips writhed as he struggled to find words in which to express his relief.

The behemoth scowled, his lips writhing in a way the human had never seen before.

The twisted mouth opened wide, the dark, leathery lips writhed.