I suspect this is the first hint of Shou's fatal flaw, and if I'm right, I don't mind it, even if he got away with it this time. Just based on the look on Kansei's face, I think he recognizes how dangerous an attitude this is, too.
but she's not denying the kid's hers, and she's spent the last dozen chapters thinking about how to ensure his wellbeing alongside her own autonomy. how do you manage to have a more stone-age take on this situation than the comic characters who live in a literal medieval-style patriarchal feudal...