Given the structure of the game, with multiple ways of getting to the same point, and getting the same item, or premise for a scene, it is too large a project for me to undertake alone. That is, if I even thought it would make sense to make such a guide, which makes less sense the more the chapters stack up and intertwine.
Difficult to get scenes have greyed out suggestions on how to get them. This is true for all of them except the feminization ones and the ones related to pee, which are only shown once the user has chosen a very explicative option for each of these more niche fetishes.