The truth is, Charlie liked it when she pulled the ball away. The look in her eyes right before he swung his foot, hitting nothing and flying into the air. Her laughter ringing in his ears as he lay on his back, gasping for breath. Nothing turned him on more. He kept going back, day after day, and every time he said "this is it! I'm not going to fall for that again!" But that was a lie, because he wasn't falling for anything. It's just that letting her pull that ball out from in front of his foot was the only thing that could make him cum anymore.