Summary
An Android with a submissive B&D owner and fills his void by becoming his perfect Dominatrix
Option A: Owner has a femdom wife that the android "competes" with. (too similar to yorokobi)
Option B: (better) Owner is single overweight, unattractive, reclusive, and somewhat anti-social. (inspired by the Billions submissive character)
Even though he bought the robot to fill the void of not having a partner, his submissive need to be dominated for arousal means the robot doesn't really "do it" for him. So he might watch B&D porn to get excited, obviously having no bashfulness about doing it front of the robot.... or he might use her has an awkward femdom "puppet", having programmed her with dominatrix phrases and actions to repeat on his command.
Little by little she starts to improvise, and slowly she becomes his perfect dominatrix (especially because she's physically much stronger than him).... maybe she even starts to accompany him out of the home - in a "prim and proper persona". Having a beautiful woman accompany him might even make him more proud and less anti-social. Especially when she secretly pushes his buttons, even in public.