I know what you mean nickman69. since I had to redownload it, I have only seen maybe one or two scene with lucy at the beginning that's it and got dialog from killer7 bout it."I have only seen maybe two with lucy and I some dialog from killer7, say I those not to have to the lucy revenge to revert my decision if I want pursue the lucys story, but it hasn't shown her, stuff except at the very beginning'
You have to take revenge on Tanja and do the good guy route with her during that revenge in order to start the love relationship with Lucy.
You also have to be in a relationship with Sandra.
The easiest way is to always pick top option in choices ( except during maddies second test ). This way you will unlock all girls and all scenes :).