I am so glad you changed your mind about separate paths and stuck to the kinetic harem route. IMO when it comes to harem games, the only choices that should be made available are choices that allow the player to choose which girls they want to add to the harem, and choices that effect how you build that relationship with them.
This story was set up from the very beginning to be a harem, the girls already know the MC is the only male that will ever exist in this world and have excepted from the beginning that they have to share him. They even go to great lengths to convince his childhood friend to except it as well. He even has to get them to really love him and trust him so he can "evolve" them. It would be kind of shitty to have him suddenly decide to just pick one and dump the rest to an eternity of loneliness. I could never make that choice knowing those girls will never experience love ever again for the rest of time, and would just end it right there.
I can't wait to finish reading this story and look forward to your next story.