Well, it's time to do a review of this game so let's do it shall we?:
In HHS+ we take the rol of the director of the school with the objective to corrupt it and to corrupt the school you will need a fully corrupted PTA so that you can change rules in ways that would point towards it.
On this point we have to talk about two aspects, relationships and character storylines:
-First of all let's talk about relationships: It's very basic to be fair, seducing a character tends to be for the most part about giving them a gift two times, getting their phone number and calling them to do social talks then try to push for sex acts so that you can increase the relationship aspect.
The problem is mainly that it lacks acts, be it talking or sex acts, it's very vanilla even when the game has very kinky situations outside of it (bondage, slavery, domination and submission...) even more cause of how limited it is on that kinky aspect we can truly feel the fetishes of our partner or anything at all. This game touches a lot of stuff but it never becomes a part of the relationship, in fact if we go to the content filter of the game we will find many scenarios that personally I never saw in the game at any point (bestiality, crossdressing, pregnant (well this one has like 1 scene in the whole game), netorare...)
-Then let's talk about the storylines: The number of storylines are very few and sometimes without much sense. On this point you will find spoilers so only read if you played the game before or you don't care:
i'm quite critic with them cause they tend to be weird or without meaning other than just corrupting a character. Let me give a few examples of complete ones:
a) Peter Hooter and his mother Susan: Basically we discover that Peter has the hots for his mother, to this point fine, but then we can make him our ally so that we get to fuck his mother? I can understand if we mind control him or if he became our sex slave that we would have more control over him, but his objective was since minute one to fuck his own mother, he has been lusting for her for a long time so it's illogical that he just works with us and is happy to get a few sexy photos, the logical outcomes of that situation should be:
1. Peter Hooter manages to fuck his mother and they start an incestuous relationship
2. Peter Hooter starts the relationship but cause of the obedience towards the MC he lets him put the rules of it.
3. If Peter is your sex slave or if you mind controlled him you can have him stay out of it.
A similar situation happen on the Karin and Sierra Hardman scenario, Sierra is a futanari that you can help her fully awaken to her sexual desires with an additional element, futanaries are shown to be much more lustful than normal people to the point of suddenly getting excited in the middle of a class and having to run to the bathroom to masturbate.
The thing is that we can get either Peter Hooter or Sierra to have sex with Karin Hardman (or just feigning it), there must be some logic about why they totally obey you on that (let's be fair, a lustful futanari or boy aren't gonna stop when they could just have sex), it is kind of a lack of logic.
b) Samantha Keller: To be fair she could have a much more important part in this game cause she is the only character shown on the dominant side to the point that if you try to blackmail her about her dominatrix job it backfires, even more she has or can have participation on other storylines such as with Jessica Underwood who can become her slave.
Call me weird but personally I would expect out of a corrupted dominatrix to try to "tame" our principal and have a more active participation on other storylines, perhaps even to the point of becoming herself the principal? I feel that she could be used much more but well, that's about it.
c) Annete: She is a special character in the sense of her fall to corruption being overly simple and unloyal. Basically even if she is in love with you she will take boys and girls to sleep here and there (kinda weird, you can stop it after you find her with the first boy but still there are many girls before lol). I don't think it's bad that she has this sluttery route but I find it bad the lack of a route in which she enter an incestuous relationship with the principal and just focus on it, or perhaps she ends with another "student ally" such as Sierra Hardman.
Leaving aside all that I just feel it doesn't manage to achieve it's full potential but you can do the main objective of the game, which is corrupting the school. It can be fairly fun and it's flexible enough to be a great adventure, seriously the base is there, it just needs to be filled with situations and stuff to be a great game (and making all clubs relevant, some of them are kind of forgotten/ignored)