I believe the best endgame route would be having the option to choose which girl you want to stay with
After all the buzz and fuss around discovery and relationship drama, the ideal conclusion to the game, at least in my opinion, would be finishing with Laura, then starting to date and eventually marrying Tara.
Being able to do that with Ashley, while cutting Marcel out, would be nice too.
Staying with Laura would be okay as well... if you're into annoying little girls.
Again, this is my personal vision of the best endgame scenario.
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