Femme Fatale

A femme fatale is : "An alluring and seductive woman whose charms ensnare her lovers in bonds of irresistible desire, often leading them into compromising, dangerous, and deadly situations. She is an archetype or stock character of literature and art. Her ability to entrance and hypnotize her male victim was in the earliest stories seen as being literally supernatural, hence the most prosaic femme fatale today is still described as having a power akin to an enchantress, vampire, female monster or demon." (http://en.wikipedia.org/wiki/Femme_fatale)

I-330 is the femme fatale of We. D-503 finds the "fire" in I-330 strangely attractive. He senses the danger and is "frightened" he wants to "quarrel with her, to scream at her..." however still goes with her to the Ancient house, D-503 is still unable to "restrain [himself]" from her. D-503 keeps using the metaphor of humans being like apartments, you can't see through the walls, except through the windows which are the eyes. In One State privacy no longer exists, the walls are entirely constructed out of glass. Which makes I-330's "two terrifyingly dark windows, and within them the very unknown" more appealing and seductive to D-503. She uses this allure to draw D-503 out of his comfort zone and into the unknown.