I'm sorry for the delay in answering!
I'll explain in parts:
The game is still in development, there is no more story after finishing the choices at the moment, so you still can't progress further in the relationship with her. You should have one last main quest which is to go back to your room after class and see the message where the game informs you that you have reached the end of version 0.1. More story and interaction with her will be added in future updates! In this version the most you can get from her is a thank you kiss for winning the election, but this requires you to meet certain requirements: sit next to her in class, help her with her election campaign from the beginning, not accept sex with Sophia, help her to clean the warehouse and make her win the elections.
Regarding the betrayal route, I have reviewed it and there was a bug that prevented you from finishing that route. I have already corrected it and I have published new compilations. Now the game is not in version 0.1 but 0.1.1 please download the compiler of your choice and it should be fixed! Also, before you get your reward in Yuri's room, you have to go to Kokoro's room to talk to her, which was what didn't work. If you open the Pause menu and look at your Bag, you should have a note informing you of this. Please check it out and let me know!
When you download the new build, if you don't have any saves, go to the following path of your old build: www/save copy the file where you have your save and paste it into the path of your new build (if there is no save folder , you should be able to create it yourself). Please let me know if it works!
And please don't apologize for the questions. The game is still in development so there are a lot of things going wrong. All the best!