I don't remember if the cheat mod provides the button, or if the button is built into the game, but look at your phone. There is a walkthrough button. However, it does not provide highlighted text, nor is it a step-by-step guide. It shows you when and how to unlock the hidden events.
You don't really need a walkthrough for Lust Theory. I was partway through season 2, yet decided to restart from the beginning of season 1 about a week ago. Any time you make a bad decision, the day resets either automatically or you can reset it by advancing to morning. Also, you should be able to scroll back enough steps to pick a different path.
That being said, there are times when you need to make errors in order to learn things about the other characters, or even to unlock story paths. An example of the latter is choosing to blackmail the teacher. You don't need to blackmail her, but if you don't, you can't go back, but you can and do recover after that side story is complete. Yes, the cheat mod will unlock the scenes you didn't see, but it won't reveal the story of those scenes.
An example of the former is choosing to mess with the adult store clerk while Megan is there. You can get to the sexy story content sooner by selecting "Don't", but you don't learn as much about her, and, as I just said, you miss out on content, which includes other sexy scenes.
The only time I have felt a walkthrough was necessary was during the Hallowe'en event. Without a guide (see the first page) I couldn't get out of the property and kept dying, hence why I reset back to season 1. That, and I wanted to refresh my memory about prior content.