i love split personality stories, and this one is top notch! you can really see and feel the parallel traits of the two identities, and it's exhilerating as much as it's suspenseful and frightening. I like writing split personsas, you get to be two characters at once with it, and you can pour some of your own thoughts and emotions into one or the other. I did that with "3 cheers for sweet revenge" with my characters Grey and Black. Still though, i like yours because it's in a social setting, and it's great to read how each switch of the character interacts with another. great work!