I know that the original author has since abandoned it, which is more than a little sad.
However, as they can no longer be contacted with any certainty, it does present an opportunity.
The chain as it currently stands seems to be geared towards using her relationship with Sayoko as ammunition against her, which is no longer suitable and fast-tracking towards sex.
I'd love it if someone could take this chain and make something worthwhile of it. I'd do it but I don't have enough decent ideas right now nor do I have the time to learn VEE code.

The real challenge here is writing something for each of the Principal types.
Sure, you can reuse the male line with a few edits for the Futa line but that just seems lazy to me. I would have no objections to using edited images from the male line for the Futa side but the problem is how to source images for the Female Principal given Claire's model base. As far as I know, most of the models were based upon Straight Male-oriented HGames.

TL;DR: Someone please do something with the incomplete Fuzushi corruption questline.

I'm not sure which chain you're aiming at here.

There's her main-line (PI) quest which I think was supposed to lead into catching her prostituting herself (as a sub?) but ends with a PC hack in the staffroom and a TODO. There's her Cosplay Club questline is what I would think of as her corruption quest, supposed to lead into enslavement-play as I recall, but also has a TODO. These two seem to align reasonably well, particularly if the mainline quest was supposed to deliver corruption, since the Cosplay Club line currently walls the later stages (including the TODO) behind relatively high corruption (Corruptor II or higher drug equivalent), and that could have been intended as the post-mainline quest.

The Sayako chain is currently just a patch to get her PTA vote because her mainline quest is incomplete, I'm not sure it really fits into the scenario, and gates Sayako going into her "corrupt people occasionally" routine in one path. (Maybe both, I forget...)

I think that all of these chains generally don't interact with the principal directly, so extending/interweaving them should be possible without too many principal-gender-specific paths/images.

I thought I had a brain-dump a while ago about cleaning up Claire Fuzushi's quests, but I can't promise it was actually any good. Ah, found it: https://henthighschool.net/index.php?msg=4862

Uh, Claire has three different chains. There's the detective path which is incomplete. There's the Sayoko path that works fine. And there's the Cosplay club path which is also incomplete.

Honestly, I'd move one of these paths to Irina, which has quest.

Sayako path should be completley split from Claire. Make Sayako an actual NPC or something.

Cosplay Club questline seems better, as it innvolves the school and students more. Tough both can be combined. Simply have the knowledge of her shopping habbits be used as amunation to get ger into the club.
Remove hte entire prostitution aspect, there's plenty of whores out there.
Also, IIRC, she is a virging, so it also doesn't make sense.

I kind of like the idea that Claire is passively student-attracted; she won't pursue, but can get dragged into it by Sayako and by the Cosplay Club. I don't recall the text of the Sayako/Claire event, but the Cosplay club definitely leads towards her being a submissive too.

I don't recall any other special NPC being in this "role" of submissive-to-students, so I'd push through with that direction. (The other submissive NPCs are submissive to the principal. The other student-attracted NPCs are not submissive. Carmen Smith is the closest, but the submissive scenes are still under the principal's direction, the students aren't particularly dominant.) So Claire's distinction is that Claire only sees the principal as her boss, her thing is being submissive to those she has power over. (I think this also makes her bi, given the dominant student in her current scenes may be female.)

I would get rid of Claire's incomplete PI/prostitution chain; and use the Sayako chain to get a minor PTA favour and also blackmail material for forcing her to join the Cosplay Club (probably could already be supervising the club, in order to give the player a hint for that path) and make the Cosplay Club her main-line quest. (Perhaps the event that opens the Cosplay Club should be tied to Claire being a teacher, and make clear that she's associated with that club. I don't believe the Cosplay Club currently interacts with anything else, unless Amelie Coppers still joins it during her club tour?)

I'd get rid of the "just talk her into it" option, but you could also keep the other options (that have some other cost, like the bribe; perhaps make it a weekly stipend instead?) to allow bypassing Sayako's chain; the principal also joining the Cosplay Club should either be dropped or made meaningful. Kind-of like the Karin Hardman setup where you can either do Sierra's questline first for the incest photo, or bypass that and go straight to Karin's questline with the semen-collection photo.

Since Irina Jelabitch was mentioned, I note that she both has no quests, and also has the Submissive fetish already, so perhaps if image sources are an issue, since she comes from a school-based anime, it might be easier to source images if she was moved into the Cosplay Club/enslavement-by-students role instead? (Although since she's an anime character, you're sourcing from doujins and random art, rather than game CGs, so maybe that's harder after all.)

If "Sayako => Cosplay" becomes Claire's main questline, then I'd have her be the person Sayako's on the phone to in her (first? second?) sneak-around-the-house scene. If the name slips then, you can only file it away for later, but it does let you put an entry in the phone journal for Claire that "You need to get closer to Sayako to work out their connection" or the like. Another option would be to have the PI catch a photo of Claire and Sayako together; that's more consistent with the other mainline quests which are launched from the PI, but I much prefer the current setup of "Sayako lets her name slip". I'd keep the current Sayako chain the same; if someone reworks Sayako as a proper NPC, you could Chat her about it at an appropriate stage, but right now the flow is fine, the only thing missing is the player knowing that Sayako is part of this quest-line.

One last thought on Claire/Cosplay Club: Right now, the first stage advances by authority loss. Authority loss is a super-hassle since most things are structured to increase teacher authority over time... What if instead of authority loss, it was Submissive Fetish gain? Every time she's browbeaten into obeying the student's demands (either on-screen or off-screen) she could gain a few points in the fetish (unlike authority, I wouldn't reduce it if the principal takes her side), and the gating could be "authority - submission" if we want to keep authority involved, or just directly use submission as the gate, perhaps with an arousal modifier, a bit like Willingness? Once she has enough points to have the "Submissive" fetish (+50, I think?) then she will agree to full PTA support, you can now give her a Slave Collar which will passively increase corruption, and the club's second stage events (sex/enslavement, gated on corruption and completely TODO) will start to become available naturally, if-and-when someone actually populates them.

Maybe the submissive fetish can also be used like inhibition in the school-grounds skirt-flipping event: Before she has it, taking her side gives her a little happiness and authority back, but after she has the fetish, stepping in would actually cost her some happiness. (But still raise authority, I guess?)

I think switching from Authority to Submissive fetish makes sense, and Authority is really hard to bring down.

I like the idea. I was just looking into it. I don't see dominance/submissions existing as fetishes?
Perhaps change it so it's willpower that gets degraded?

On another note, the following her to the shop can have you investigate what she is buying. Magazines with student-teacher content might give the MC a hint.

I might have the wrong fetish name, I thought it was Submissive; I mean the fetish that is checked when you try to give someone a slave collar.

Masochist? I was just looking trough VEEs PersonFetish node. That's the only thing I can find that can even remotely fit.


On another note, Claire is never added to the Cosplay club when she joins, which seems stupid (and a very easy fix)

I checked, and turns out the Slave Collar will equip for an NPC with any of Bondage, Masochism, or Sadism fetishes, or lacking those, lowered willpower and medium corruption. (It also has a higher ceiling for generating corruption than I thought, so even if you have to corrupt someone into wearing it, there's still room for them to get a little more corrupted by it.)

I guess Bondage is the closest, since Sadism is the wrong side of the power dynamic, and Masochism isn't really the right thing, I feel; she's being controlled, not tortured.

That said, noticing that the slave collar generates corruption, maybe Corruption is the right measure for the whole Cosplay-enslavement chain? Or maybe we need Dom/Sub fetishes, and to hook slavery up to those, rather than mixing with S&M. (Actually, I don't recall much S&M content, I suspect the game uses S&M as equivalent to D&S... Sam Keller and/or corporal punishment detention are the only things that come to mind.)

I guess you could use willpower as a substitute for Dom/Sub, but addding actual fetishes might be nice, since it allows one to be a switch