Thank you all very much for the feedback so far.
In that case, it will be Netori not NTR.
The main difference between the six female main characters and the side characters is that the main characters can be corrupted or romanced, while the side characters (such as Miss Clements) can only be corrupted.
While I wouldn’t call it an adaptation, I got the initial idea and a lot of inspiration for this game from this one:
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Harem, pregnancy, and incest are all planed. But the harem and pregnancy tags are probably going to take a while before they make their first appearance.
The sex scenes will be animated.