you can already though, you can choose to lock it from increasing, decreasing, or even changing by going to the respect page. If you mean you to increase or decrease, you have to make specific choices in the story, if your looking to be more submissive, I made a list of times where you could lower it here (There not all listed though so be aware)https://xperiment.itch.io/lust-odyssey/comments?after=120