hey so ur comic about corvo n jess hiding their relationship terribly is both valid and canon!!!
theres a book (or newspaper) in dishonored 2 that said their relationship/daughter was, i quote "the worst kept secret in the empire" to the point where people were openly questioning if mr foreigner corvo understood what the royal protectors job was... like mfs be goin "does he like... know... hes not SUPPOSED to be doing da queen... serkonans man", "protecting the royal bed from being cold", "no ur majesty we have NO IDEA where this mysterious baby came from ur majesty, btw mr attano will personally be preparing ur bath tonight and hopes ull forgive his serkonan tradition of waiting for his majesty in the tub itself"
... royal profucktor
I assume you mean the royal protector in our time book that's like:
The romantic involvement between Corvo Attano and the Empress Jessamine Kaldwin was a terribly-kept court secret, and thus it is widely held that Emily Kaldwin is their daughter.
In terms of actually being mildly serious, I think canonically Corvo and Jess put a load of effort in (because you know, secret romances are chef's kiss) but then boom, Emily happens and IT BECOMES CONSIDERABLY HARDER TO HIDE because a large amount of people can do the mental maths of:
however i LOVE your idea that they put in zero effort like the comic but Corvo and everyone excused it with "welp! he's serkonan!" like:
Corvo: yeah lol it's totally just Serkonan tradition to make out with your friends, this is normal
the serkonan ambassador: that's not true we don't do that--
Corvo, pointing at him: shut the FUCK up, Greg