I made a mod for this mod. I had started playing through it, trying to focus on the blackmail stuff, but there were some places where it seemed like the blackmail path wasn't open to me if I always selected the corruption options recommended by the mod. After looking at the script, I decided not to do the traditional hint mod that tells you how to get your stats in the right place to unlock all the appropriate options. Instead, I simply removed the conditions for the dialogue options that lead you down the blackmail routes. So like, if there's a dialogue option (which leads to blackmail content) that would normally only show up if you were completely faithful to Brian, now it will show up even if you chose "grow further apart" every time. This doesn't mean you can do full corruption and blackmail routes in the same playthrough, because a lot of the later content for those routes are just alternate versions of the same scene. But if you want to see the blackmail stuff, now you can basically just roleplay all the dialogue options available to you however you like, without having to worry about blackmail scenes being blocked off.
(Installation instructions: just download this file and overwrite the original script.rpy. This was modded from v1.19.4.5, and it's not a "dynamic" type of mod that will incorporate script changes of future versions.)