its better than starting new game
It is in fact not, because you wouldn't necessary know what the file hadn't done. Has the file heard Giron talk to the Pater about polygamy? Does character x know about character y? It would be much more difficult to figure out. And NTR isn't your only choice, there are several other choices that greatly effect how LI's act.
There are a total of 77 quests that can be completed in the game so far, 57 of those are character specific quests.
91 quests total available, 42 LI's in the game. So a rough average of 2 quests per LI.
I have started around 4 or 5 new playthroughs in 2025, I play all to content end. I am telling you what you are asking for would have you asking questions here over and over.
If I gave you one of my saves, you wouldn't even be able to use the walkthrough because I rename all my characters, you wouldn't know who is who.
I don't have the save to give anyway since I only have completed ones, but what you are asking for doesn't really exist.