I have been following this game for some time now and after every playthrough, I was frustrated because I did not get all the right scenes. So after 2.8 was released I thought of keeping track of all the choices and the impact of those choices to create the best possible walkthrough I can. Initially, I planned to keep it just for myself and use it later when I would revisit the game and would have forgotten half of the choices and the impact but I have read a lot of people asking for a walkthrough or being confused about why certain scenes are not triggering for them.
So sharing my version of a best playthrough, I hope it can help all of you out.
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Note: You will need the cheat mod to make full utilization of the walkthrough I have provided. Also to trigger certain scenes you will need to play around with Derek's affection stats which I have mentioned in my walkthrough. Use the stats I have provided and you should be able to get the scene.