If the desire of any sex toy acting with or replacing any of these actions is coaxed, the OW may just assert the thing between them and the RE at any instant, because they do not have the same texture, friction, heat capacity, and hardness as flesh. This may not always suggest to the RE that the OW is totally done with their services, as there may be synergy with the RE's actions and something like a clitoral hood surrounding vibrator or a penetrative device.
III. Lips and suction
IV. Outside fingers
V. Penetrating fingers
VI. Composition of maps
VII. Starting and stopping
VIII. Harmonious and holistic speed adjustment
IX. Recording and recalling memory