Superheroine Sisters have taken on the Mantle of Liberty and Justice. They have come to investigate a doctor that may be responsible for the disappearance of numerous superheroines. It turns out the good doctor has been taken over by the evil entity known as Sinn. Sinn takes over Liberty and then over powers Justice. Sinn takes great pleasure in using one step-sister to violate another.   The sisters have been tainted by Sinn and when they wake up side by side in a bed they are overwhelmed with an unspeakable lust    Cinn enters and the exhausted sisters find themselves again filled with desire and are the entity's willing, even desperate slaves