Centauri Doll by Wendy Rathbone

Hades is a Slave King, one of the most powerful and wealthy beings in the galaxy. But all he wants is to be left alone with machine servants and his collection of broken robots. So what makes him purchase a flawed vat-grown human slave boy?
Doll, one of the most beautiful of the manufactured Botticelli pleasure slaves, is imperfect. He was pulled from his tank missing his right foot. Not only that, something must be wrong with his brain, because though he was bred to want pleasure, he finds himself filled with a different sort of longing no slave should have. He wants to be loved.
Doll is way outside Hades’ preference for company and sexual release. But when Doll imprints on Hades and falls in love with him, he yearns to find a way to become more to Hades than just another item in a vast and priceless hoard.