Then his lips twisted, and, that time, I knew just what he was doing.

His thin lips twisted a bit on the final words.

He leaned against a stop sign, lips twisting with pain.

Her lips twisted into an attempt at a grin as she stood up.

Her lips twisted into a frown and she looked down for a moment before meeting his eyes again.

He hung up and sat staring down at the floor, his lips twisting.

The man's lips twisted into the parody of a smile.

Through the mouth hole in the mask I saw his lips twist into a smile.

His lips twisted as he turned back to them.

His lips twisted, but finally settled on a reluctant smile.