We'll see what we can do. Currently it won't really make sense to set the story this way, because the moment you lock in one single partner it narratively breaks all other routes.
We see a solution in providing endings for the game depending on whom you found love with, so at some point we want to let players choose their partner (or multiple ones) to see what type of ending that will give them!
That could work, the other thing i see is the potential of what a few other games do which is an early end, so you can persue a proper relationship and if you choose that option you get like a cutscene and a bit of story (probably a few sex scenes) and then the game ends and you get an option to go back to the previous choice or end the game which takes you to the main menu. Which is in practice what you said just implementable currently.
