The process to reveal the fetishes (asking small/large favors) is broken for me. Even when a success is indicated, the process may not advance. I have not been able to determine anything consistent to get the process to advance.
Also, currently the ability to recruit Derek and Tamara to the NCHDL is broken. Once revealed that Derek wants to play soccer, no option become available to get Ms. Larson to allow him to play. If going the Sandra route, after the date, Derek does not join the NCHDL and remains uncooperative during tutoring.
Tamara is supposed to invite you to her home then flake out, then join the club as an apology (once Favor/Love/Lust conditions are met), but even with 100 Favor/Love/Lust no invite ever happens.
Finally, there never is an option to ask Ms. Larson to get Chrissy to join the club.
For the fetishes, do your failing targets have Corruption? There is a minimum Corruption value necessary to advance the final question on both small and large Favor.
I just completed the club with both Derek and Tamara so I know it works modless. The mission is set up to provide a particular story-line and thus is brittle. There are a couple of unintuitive steps that need to happen to keep the mission flowing.
For Derek, I can think of a couple of things. To get the soccer option, you may have to approach Larson in her office and take the "about Derek" conversation option. Please let me know if that works and I'll update my walkthrough to include that pointer. For the Sandra route, after the date you need to talk to three people to complete it: Sandra at swimming class, Derek in the hall (he approaches you after you talk to Sandra), and Freddy as part of his tutoring after school on Monday. It stalls until the Freddy conversation happens.
For Tamara, I can think of a few things. Has Freddy approached you in the hall to tell you how Tamara always goes downtown on Mondays? If not, have Freddy investigate her for one week and wait for the random event where he tells you between classes. Are you tutoring Tamara on Monday? The invitation seems to only be offered then -- it's a spur of the moment decision on her part. Could you have missed the invite and cut out of school early on a Monday? She only offers once and it's a problem if you didn't stay in school to get the option to go with her. Did you follow Tamara downtown? She guesses or figures out it was you and keeps her distance afterwards.
Chrissy should be one of the professional favour options. I don't think I have a recent save to verify, but IIRC, it may require some Freddy investigations of both Tamara and Derek to trigger.