You start to move

You start to move, your teeth gritting against the bite gag, the dildo moving up and down inside you each step.

“MMMM!!!” you stop, and the dildo stops as well. Just before you got halfway to get what you want.

You take a deep breath, and decide to go onward. And the dildo moves again, forcing you to stop.

“Come on: we don't have all day!” you hear Master's voice. “You either finish in one hour, or you don't finish at all.”