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Frank's parents lost their patience as they heard that his son had already impregnated all his wives! In modern society, it was often seen as something beautiful to have a child… or two, or three…
But having so many at the same time always meant bad things! This was often because of money, resources, people don't have enough money to maintain such big families, even less the patience for the mother to have and maintain so many kids.
But well, if each kid had their own mother, then it wasn't so bad. And Frank wasn't in any need of money, he even had his own self-sufficient internal world, the divine realm.
And each of his wives also had their own divine realms too, which were self-sufficient too…
This means that there was no actual reason to be surprised, and the two quickly were calmed down by Frank after hearing his explanations about how, despite how ridiculous it sounded, wasn't so bad after he told them everything.
Check "The Protagnist's Sister Is Actually the Strongest"!