I kinda wish they didn't have to have this generic sister going crazy plot point. The rest of this is so we'll done in mood that I dislike this more standard thing being in here.
I don't really get especially mad at ntr developments for the most part, if something bothers personally I tend to just drop it.
This plot is just strange though, it's existence only makes sense specifically to try and bait people reading to get mad. I guess that's this author's brand by the...