If you want to try with my save at least tell me what I'm doing wrong
There is nothing wrong with the save. (Maybe you mess up with cheating time and didn't sleep or something else...)
Steps in your save
Tues
09:00 Kitchen Give Her Blue Pill
09:00 Living Room watch tv
11:00 Living Room play video game
12:00 Living Room Offer Drink Rot Gut Whiskey
13:00 Living Room Auto Scene where MC transfer Diane in her bedroom. Select Do nothing
13:00 MC Room watch Incest Porn (Nothing happens)
Sleep... Sleep again....Sleep again
Wed
09:00 Kitchen Give Her Blue Pill
12:00 Living Room Offer Drink Rot Gut Whiskey
13:00 Living Room Auto Scene where MC transfer Diane in her bedroom. Select Do nothing
13:00 MC Room watch Incest Porn SCENE HAPPENS.