I believe that you can make choices in the future to stop/continue the romance with her.
Titty Master in my opinion a walkthrough is not necessary. There are choices that will change the path slightly, but for the most part this is a pretty straight forward game. The game isn't trying to trick you with the choices, if you like a girl you should be able to figure out how to advance her story pretty easily. Again, there are some choices that are mutually exclusive and will impact the path you're on slightly, but for the most part I think you can see most of the content without a walkthrough.