Imo this is one of the few Visual Novels/Games done right. Especially for a Female Protagonist.
I don't mind teasing old or fat or ugly men, but i do mind being forced to have sexual relations with them as a consequence of aforementioned teasing. Or being blackmailed or raped. That is not to say different kind of games with different kinks don't have their own appeal.
What JOHN does right for me is the choice system. After skimming through the Walkthrough it looked kind of complicated at first, but after playing i found it actually very easy to navigate what i want to do and what not. You have a choice every step of the way i.e. you can choose to tease and when the other party wants more you still have the ability to decline. Even if i chose not to do certain actions i never suffered a loss in terms of missing out on the overall plot or continuity of the story.
The writing is excellent too, especially the descriptions of sexual acts and how the protanist feels doing it. This is a really big part in making the game more appealing, at least to me. I cannot understate how important it is to have a good description of how the act itself feels to the protagonist, the physical and emotional parts of it. Both of which are excellent in JOHN.
I was never even bored in between scenes when it was only "bland" small talk between the different characters.
The renders are of good quality too, however i personally don't really have an eye for the subtle differences between good/great/excellent renders. I didn't find any obvious flaws to the characters that jumped out at me.
I really hope the game continues in the way it is now and i am sure i will always enjoy it.