She tried to rub the involuntary smile from her lips, and failed.

An involuntary smile tugged at the corner of Kendel's lips.

A rare involuntary smile leaped to her face, accompanied by a peculiar and unexpected sense of relief.

The abbot wiped his mouth to hide an involuntary smile.

In Fleur's involuntary smile was the whole secret of why her marriage had not been intolerable.

All the while Hamilton stared at me, smiling a most curious, perhaps involuntary smile.

An involuntary smile of relief widened across his face.

She blushed more, this time with an involuntary smile.

Not one of us, even after last night, can say the word 'ghost' without a little involuntary smile.

An involuntary smile turned one corner of the Sergeant's mouth.