Sarah G - Busty Cam Spy

You have finished a web chat with one of your colleagues Sarah but she hasn't switched the webcam off properly, instead of turning yours off you decide to carry on watching Sarah work. The view from the webcam you have is perfect you can see straight down her top. You decide to have a sneaky voyeur wank over her perky natural tits while she is unaware you are still watching, can you blow your load before Sarah realizes she hasn't switched her camera off?