player driven just means that it is available any time she is marked and not in a conflicting form. conflicting forms, like milf for example, will take it off the menu. so all you need to do is get her marked while you have 15 or more influence! sugar baby and peasant forms are unlocked through the harem tf itself.
Win the first 2 challenges those being fighting Akarion and winning and beat somebody in chess to get influence make an alliance with Reese then TG him in which he ( or she now I guess) promised to give you more influence than what you used then knock magnificence into the water on challenge 3 that should be enough influence and the condition met for the harem TF (sorry for the long message)
felcandra blends in to the diffrent backrounds for example inside the dining hall on act 2 he can sometimes replace the wolf head with a Dalmatian and on the parapet he does the same thing replacing the piller of the wolf and most of the time on act 3 he becomes a bush shaped like himself next to Mathias in the courtyard. Hope this helps Nova