1.   His narrow tongue flicked once across each dry lip.

2.   His tongue flicked nervously across dry lips as he prepared to open the lid.

3.   The verb is longer but unambiguous, a demonstrative moment as the tongue flicks anxiously away from the palate to release the vowel.

4.   His tongue flicked across his lips.

5.   Vicious tongues of chain flick through the air.

6.   His tongue flicked the nub of her nipple, circled her breast languorously and then flicked again.