A motif.
A motif; a theme or subject, especially one that is central to the work or often repeated.
An incentive to act in a particular way; a reason or emotion that makes one want to do something; anything that prompts a choice of action.
Something which causes someone to want to commit a crime; a reason for criminal behaviour.
Relating to motion and/or to its cause
Causing motion; having power to move, or tending to move
To prompt or incite by a motive or motives; to move.
The act by which someone is tickled.
A sensation that tickles.
That tickles