Good question! You do alternate playing between Devin and Carter, so you experience the story through both POVs. In that sense, the structure is very similar to Our Red String (a game I also love). You don’t need to select just one protagonist, each chapter will naturally alternate as the story progresses.
As for the Impulsive/Controlled choices: they function as stats that influence which actions are available to you. Certain decisions will unlock or restrict options later on. You’re absolutely correct! They’re not strictly labeled as Dom/Sub, but they do operate in a very similar dynamic. Impulsive choices are driven by immediate desire, while controlled choices are more deliberate and restrained.
Hopefully that clears things up! Cheers, JuiciestBox19.