($2.99 or Kindle Unlimited) The queen of succubi has been freed from her Nowhere Jail where she then kills a bunch of dudes via sex and definitely enslaves a woman that she insists is not a slave [purchase link]
This one is interesting because despite being like 50% sex, it reads less like an erotica and more as a plot-driven story. It also takes a first person route of a top, which I appreciate because you just don't see that very much.
Giving this the purchased tag because of the totally-a-slave woman, even though she isn't purchased.
Giving this the consensual tag because it reads as consensual, but, well. Slave woman.