Suddenly, the machine stopped its thrusting. Luckily it stopped whilst in the forward position, so Yu Qingxue was able to give her nipples - and her back - a momentary rest. But don't worry, this was all part of the planning. You see, the machine is plugged into the mains via three timers, one plugged into each other. Only when all three timers are on will power reach the machine and it will fuck her nipple clamps. Furthermore, to sprinkle in a delicious fear-of-the-unknown element, Yu Qingxue had covered the displays with tape when setting the timers, so she had no idea when the machine would turn on or off.