Sydney is incredibly turned on by your predicament, and is enjoying every second of her passionate teasing.
Even when she has to stop, she keeps up her teasing. Her looks and teasing banter make sure that you get no real rest and relief as she pushes you closer and closer to the very edge of your endurance.
When you make her stop touching you, often she will just sit there taunting and teasing you in silence. It is never long before this has the effect she desires.