Ugh, I really don't want Shibuya to go down the Adachi "I want to be a torture sadist" route. But it seems like that's where we're headed.
I was hoping her revenge would be something that allowed her to keep Akiba in check while he was controlling her.
Ex. If Akiba started acting like a conceited jerk, Shibuya could send him an electric shock with her mind or freeze him temporarily.
Personally, I think a great form of "revenge" would be forcing him to share the leader position with her. Akiba hates sharing power, and going this route allows Shibuya to get revenge without becoming just as bad as Akiba and Adachi.
But nonetheless, I'm interested to see where this goes. I'm praying to god that Siscon Bro doesn't fall into bloodlust.