... we witness her twisted fascination with sex at her court in the Chicago Underground ...
It seems the Ladies are "supposed to be" erotic & tempting.
Aurora was. Lily already was, as a changeling, but got more-so.
Maeve was. Molly was, as a mortal; but (again) got moreso.
(of course, the ladies are
also supposed to be chaste & virginal)
As far as a "twisted fascination with sex" goes... I'm not sure how well
any of us would deal with a hyped-up libido & centuries of chastity! But the Ladies are "frozen in time," perpetually stuck at that horny-late-teen stage; and Winter is supposed to be cold, and cruel.
Maeve seemed to have a "winter-lady"-ish sort of sexuality to her.
... Yes, lying may of delighted her, but was it her or Nemesis that was doing the lying through her? ...
The Lady-Mantle is, I think, strong enough that Nemesis couldn't straight-up override Maeve.
Cat Sith almost broke free, for a moment. The Lady is stronger than almost all the other fae; the Queen and the Mother are stronger than the Lady, of course, and (in Winter) Harry seems to think that Lea is stronger than the Lady, too... and I think that may be
it? Kringle-Mantle...? I don't
think the Master of the Hunt is as strong.
But Maeve (in the climactic scene on the island) seemed to be reveling in lying-for-the-sake-of-lying, not telling a lie that would serve Nemesis' purpose.