The smile tugged at the one side of his face that could move.

For the first time today a smile tugged at his own lips.

After a little while a small smile tugged at her lips.

A smile tugged at the corner of the Professor's mouth.

A smile tugged at the corners of his friend's mouth.

For the first time, a smile tugged at the corners of the female's mouth.

A smile tugged at the corners of her full lips.

A faint smile tugged at one corner of his mouth.

An emerging smile tugged at the corner of his mouth.

A reluctant smile tugged at the corner of his mouth.