In later updates, the game added a "Status" screen (sometimes accessed via the phone or menu). Check this often. It tells you exactly what affection level you are at with each girl.
Vixen (real name purposefully obscured; sometimes implied to be an alias or a dissociative identity) Appearance: Tall, athletic build, long dark red hair, sharp green eyes, often smirking. Dresses in provocative yet practical clothing (leather jackets, ripped jeans, combat boots). Role: The provocateur, the gatekeeper of secrets, the wounded anti-hero.