I was thinking the same thing but maybe it's that because they know the divine beast is well.. A beast, so the only way for him to have the kid is sleep with someone else? And bc he's already married to the beast it couldn't have been a girlfriend. Like maybe the Duke brought the ml as an infant or something and when everyone saw him that was kinda the default assumption??? Idk girl

Pls don't be harsh but i quite don't get it...
If the ml's father married his divine beast, then who is the "prxstxtute" that the child house of fyre smth pertaining to when he's bullying the ml? Is it the same person?