So I'm kind of confused as to how to access this new content. Is it to the left after you wake up in Khazeem's place that has a trapdoor and a chest and is guarded? Because if so I can't go there. Keep getting "No going back now" or something.
Nope, much earlier than that. Entertainment District II. To be clear, if you want to do the host club, you have to get there WITHOUT being in slut mode already. If you are, you'll completely bypass that section.