I think it’s more of a thing that the human worshipers added on their own. Amon has little to no interest to initiate or propose any real structure or rule and he just went with whatever it was going on bc it entertains him. It doesn’t also seem like neither nain or amon were actually involved with these so called “lovers” but concubines are seen as property and symbol for wealth and power for many cultures throughout history so that may be it, they’re considered the trophy lovers or back-up in case the queen can’t serve intimacy or an heir.
Have you read " i can see your stat" big spoiler ahead the sha amon in this story is the same creature a dragon from that story well compare the two mls it like what if the dragon just wen and do things as he please and pay 0 mind to his mate, and all he care about is keeping his mate and 0 care for any others lol
if this have a novel can someone spoil me....- IF Amon do really love Nain, why does Amon have so many concubines? (i forgot their term for other wives (≧∀≦) its a miracle i remember their names LMAO