Heh, I'm watching YnS thanks, not an issue
But giving much credibility to wincest here requires something in the story or plot that supports it. Other than fan wishing, I haven't seen anything to support such a story route (unlike YnS where the story elements support it in large herds). I do see a brother and sister were distant for a long time and its been a bit painful reconnecting. Friends are helping that along (as we see in this episode).
As blitz1/2 notes
"If there is a second season, we're going to need to fill a lot of missing (plot/character development) holes."
I second that. I'm not sure I remember a good series that had so many hanging story threads as this one does. The whole season is an 'introductory set up' which screams for more seasons (and more likely compels us to buy the novels).