Not that it would happen, but it would be interesting if she really did become a black hearted villain and lil' bro was the start of her origin story of how she became a criminal mastermind.
Anyone else notice that the sister wears casual clothes before the reveal but switches to more formal clothes after? I thought that was an amusing detail.
Indeed, the depths of fetishism far surpass the imagination of those who deem themselves normal. God does not send people to hell; they chose to enter the abyss themselves.