Ok - here is my review for the Hardworking Developer (because I like devs who ask for review)
You have two sets of players - one who like NTR & other no NTR - you need to put Attributes & Skills to MC so that he can be developed by the Players to their own settings - a Strong willed, skilled MC will avoid NTR & end up with harem like in Real Life where chances are low for studs but studs do exist - then we have the lowly NTR MC who get cucked everytime - this will make the game dynamic.
For every twist in story you will have make at least 2 paths - NTR & non NTR. if you want Harem - then we need Harem & Non Harem (monogamous) ending.
The Dialogs need to be matching the character of NPC & MC. Motivations need to be real, relatable & clear even if the story is fantasy. Attraction need to develop - you need to make most attractive NPCs hardest to seduce. Forbidden fruits should be near impossible. You must balance the Pay offs in sex to the Difficulty in Seduction. High Seduction Difficulty = Sensuous sex with big breasts, great character, great ass (everything MC dream of)
Sex needs to be Sensuous - not just mechanical - oh you put it in, yay type of sex is boring - you need to develop the NPC as they have sex with MC or with another NPC. If a MC is involved with a NPC - they must develop new characteristics as they have sex with the MC - becoming more supportive of MC. But if the NPC is having sex with another NPC - the MC's relation to that NPC should be minimized - like she dont care about the MC & will double cross MC for her NPC lover.
This will make your Game far more dynamic & worth time, money. The Ending also will be more easily driven - may be MC end with owning & running the entire company with all his harem pregnant & dependent on him OR worst case MC ends up penniless alone while the driver becomes owner & daddy of MC - you get it right? there are several possibilities here.
Hope you are not disappointed with the overall bad comments here - learn & develop - you will be successful