FWIW I am writing a book in which synths can provide fuull service as personal assistants on and off the job. The technology will include tissue development and response capability in which their eyes light up to indicate the human has pleasured them. Over time I show the development of these capabilities.
Hate to burst your writing aspirations, but the 2014 movie, "Vice" (starring Bruce Willis) is exactly what you describe. They are human clones with human tissue, organs, and brains with implanted chips to program desired responses for the enjoyment of rich clients. They live in an expensive "resort city" and live their lives over each morning when they awake with no knowledge of what they experienced the night before, as horrific as may have been. Eventually, as usual, one becomes aware of her predicament and the story gets more interesting.
Your scenario has also been done in numerous other sci-fy books, stories, and movies. "Blade Runner" is probably the first and is a cult classic with the same human clone for natural human's enjoyment concept. However, if you can provide a different story line and/or plot with interesting dialog within the concept, you may have a winner if directed with vision.
May I suggest you look back into the early writings of Arthur C. Clark, Dick, Heinlein, and many others. I've always wanted to see a movie of Clark's novelette, "Childhood's End" with the final evolution of mankind. Big concept like his 2001.
You also may want to look at the recent "Interstellar" for science terms and physics theories. Although it starts with the mundane end of the world and space exploration for humanity's survival, it uses general relativity, space time continuum, event horizon of black holes, speed of light, and a new proposed dimension of gravity (interesting). It's long, but well done...even moving at times. Good luck in your writings.