Harem Breeding Slave Book 2 — Allan Aldiss

I had been lowered to the level of a dog: I looked like one, ate like one, did my business like one, and had sex with a dwarf who looked like one, having been sewn into dog-skin, like myself. But at least, I thought, my Mistress could not be planning any further degrading humiliations for me. I had already, I felt, reached the very bottom. Nothing could be worse than what Raisa had already done.