Or, if it's not that the Slave path has points that are incompatible with the Werewolfstory line, and just a sort of immersion that your instincts warn you from gambling, just give the player the Option to ignore your instincts and progress the route regardless.
Again, I am enjoying this game a lot and it's super fun, but it just feels like a very weird choice to prevent the player from continuing a route of their choice by giving them a warning.
I expect half of the paths in this game to lead to bad ends, doesn't mean I don't want to experience them.