>>13101
>>13102
I think the rule was estabilished by Tamamo after Black Alice's rule. It has been a long time since the VN, I dunno if that was some measure to avoid another psychopath from rising to power or something else. Sphynx did deal with how her trial was to make dragonlovers understand the dilemma the difference of lifespan would cause, which was flipped in the end of VN, with Luka saying if he inherited an angel's lifespan, he'd follow Alice to the grave once hers ended.
Putting the incomprehensible love part aside that, the Succubus Witch did foresee Luka would always have trobule with women, and then said it wasn't a prediction but that Monster Girls tend seek strong men because of this increases his likelihood of survival in face of their high libido and power. We did see in Paradox that Misstauros got widowed exactly because her husband eventually succumbed from 30 sex a day. If a Monster Lord doesn't have a rule like that, what would happen if she fell in genuine love with a man much weaker than her? We saw with the Mermaid Queen a depression that lasted centuries.