Well, I've played in this so-called porn-game, and the first thought was:
"Korben, sweetheart, what was that? It was bad! It had nothing!"
Plot:
I imagine what tortures and anguishes author came through while giving birth to these textwalls of nonsense.
It's confusing and ridiculous, but in the end I don't care. No one cares, it's a porn game and it has to be!
The existing part of game is worthless to play due to lack of sex content.
You should consider on implementation at least 3 characters to interact with, otherwise it'll be skipped and even if you as devs switch this option off (I mean "chapters skip") players will ask for save with real beginning.
To avoid it I suggest next:
1. Portrait with dumb chick in hall may travel to Marcus for Sally's demand.
BJ/Vaginal/Anal scenes - schematic (but pervy and excited) view.
2. Helena Ravenclaw: again BJ/Vaginal/Anal with IN/OUT cum options with middle quality of drawing (she's hot, fuckable, let her show it to us).
The achievement of scenes may bind with Brutality/Finesse stats.
3. Luna Lovegood:
3.1 Luna thinks Marcus is a part of her subconsciousness: masturbation (accent on the juicy pussy), fuck with pink unicorns, bj to teddy bear, etc.
3.2 Real Marcus is in Luna’s dream : BJ/Vaginal/Anal with IN/OUT cum options - yeap, all of it. It's just dreams after all, whiches may bind your future story to the whole thing.
Scenes may depend on "Perception" stats.
4. Toilet scene near Filch' shelter: peeping BJ/gangbang with schoolmates and GloryHole BJ to MC: girl sucks off Marcus for money/thinks he is someone she knows. Focus on girl's face and mouth, not on the utter darkness of dividing wall (I know your way of teasing and let be honest it sucks).
There's no need of full-sized pictures with incredible amount of small details: just good and sexy drawing of girls.
Also the events don't need tones of explanation text. Four textplaces will be enough, be perfect if they will be variable.
All scenes must be repeatable and noncrossing - available to perform all of them during day.
Please, don't do TJ/FJ/HJ with them. It's so predictable and included in countless quantities of mediocre games that serve to the one purpose - hide lack of content.
All above-enumerated allow to fill the emptiness of long prolog gaming, make it worth to play and dilute boredom of grind.
Future developments:
1. Clothing:
I've seen you provide the clothing option, but, please, reconsider it. All this stuff already was in WT mods and it's just another way of cloning previous things. Besides the fact it takes tones of coding it barely has nothing with story progress.
Look at "Teaching Feeling". It has a huge wardrobe, tones of gowns, hairpins, panties, hats etc and meanwhile Sylvie, the most adorable and cute character I ever seen in all h-games, has same issues with her story because Ray still plays with clothing/reclothing instead of main progress.
2. Mechanics:
All those endless clicks about "panties and Hat" were fucking mess. Leave it as is, otherwise we won't get anything new, but aware of it in future.
3. Story:
Simplify the universe. Now it has a lot of descriptions why heroes act like this. Let it be based on assumptions. Follow the Akabur's example: evil is evil, men for work, girls for breed. Don't overcomplicate the things.
4. Art:
Art is incredible and promising, and this was the only thing that keeps me on playing despite all frustration that the game gives.
If you decrease quantities of small details putting in each location picture to increase quantities of sex arts no one will mind.
Just a mention, adding about five new sex arts per month will allow easily doubled your income as someone else already mentioned it so more pics, less needless mechanics and text for text.