Hello there,
1. Anna wont have scenes with Marrio, the share scenes for characters are for those in their "circles", Mario is separated from Anna.
2. This already happens in game and the player has the choice to join or let them finish.
3. There are no plans other than the milf swap at starcon for Ken to be the only one doing Anna.
4. This already happens.
This content will still stay the same, the player will always be the deciding factor to if those happen or not. (The ones already in game)