might be an idea to have our bot have some super tech installed involving nanites. something to explain the self repair functions, also opening up some out of the norm features for a robot.
one such random idea could be changing her breast size without the need to buy parts. another could be actual pregnancy if we want to get really bonkers with the sci-fi stuff. heck speaking of that it could be pretty damn wholesome to turn our bot into a mother.
another random idea could be teaching the bot to role play during sex.