Lol, people read "this doesn't mean that in the "love routes" everything will stay idyllic the book has awaken dangers!", and they start freaking out that their fictional MC is going to have his fictional women stolen from him. Dangers can mean anything. The premise is about some guy messing with a spellbook. There's all kinds of dangers that could lead to. It doesn't mean NTR. He, or the people around him, could end up dead (though it seems like this is a better option than NTR for some people).
Either way, it's dumb to speculate at this point. Just enjoy the updates as they come out (which are great), and follow the walkthrough if you're really scared of anything remotely NTR.