No offense but did you actually like read the story? Because the main character DOESN’T and hasn’t treated it like a romantic relationship at all. Although it’s hinted that they start to grow feelings for each other, they stay out of an obligation to raise the children that were born (it’s the name of the story for crying out loud). Also, saying ‘switch the roles and people outcry’ just doesn’t even begin to scratch what even happened in the moment in relation to the story. The story doesn’t take itself seriously to that point, the story is focused on THE RAISING OF THE CHILDREN. There’s other series that have admittedly heavy and or interesting topics that don’t really touch on them as they are not the focal point of the story. Not every story is going to be beserk.