Possible Clues:

• Trifling
• Playing (with)
• Scarlett O'Hara suitor treatment
• Engage in some activity as if it were a game
• Playing (with), as a cat with a mouse
• Playing (with an idea, for example)
• Monkeying (with)
• Flirtation
• Idly playing (with)
• Flirting lightly