Sisters in Lust(2002)
A novel by Ray Gordon
When Gary dares his quiet girlfriend, Juliette, to don a black wig and masquerade as her nonexistent twin sister at a party, neither dreams that Juliette will act out her wildest sexual fantasies as Christine. Soon Christine takes over and destroys Juliette's relationships. Christine is no longer just a black wig and a dress in the closet; she's a force to be reckoned with.