Firstly: You will get asked in the second chapter by Amber if you want to do something, but if you decline the request that will stop the involvement.
Also, I had an idea today, but it's not fully thought through yet: An option in the menu to disable the lesbian content fully (like the disabling NSFW option). For the people who don't like it which includes only minor changes to the classroom and toilet scene and less than 10 new images.
What do you guys think about the idea?
Edit: Implemented in version 0.1.1!