Alice acts and dresses like a boy, but never says she is. Everyone is fooled at first, but soon begin to realize and Alice acts and dresses more and more feminine as time goes on with some Lampshade Hanging.
Alice lets him know that the only thing that seperates Alice from Bob is gender and that Charlie fell in love her, despite thinking she was Bob. Alice also reveals that she had excellent reasons for hiding her gender and never meant to get as close to Charlie as she did because she didn't want him to feel that betrayal.
Parodied: Bob reveals "he" is really Alice, but it turns out that "Charlie" is actually Dana. Not one to be shown up, Alice takes off her mask and reveals "she" is really Zack, and then Dana turns off her hologram emitter, revealing "she" is E'ri'kh of the thousand genders. They decide to start dating.
Zig Zagged: Charlie is attracted to "Bob" but then Alice reveals herself, except Charlie just came out of the closet, so Alice gets a sex change, but it turns out Charlie is really more Bi than anything else.
Averted: Alice masquerades as Bob, but no one shows interest in "him."