I did choose to fuck her on the first encounter at the house, but her scene count is still 0/5 and I cant figure out how to progress. All she does is sit on Kali's bed. I am assuming this is due to a bug somewhere that nothing seems to trigger.
Addendum: In case you haven't come across it before, cheat codes need to be entered at the computer in your room. There is a "text editor" kind of icon that asks you to enter the code.