Yōuyuè de clan

the Yōuyuè de clan is a special clan comprised of futanari who came from a secret line that originated from an isekai protagonist. when choosing the power he wished to have he chose complete sexual prowess and chose the task of natural selection. because of the nature of this isekai in which whatever job and power the protagonist chose the god would work fate so that the protagonist could deal with the worlds problems and its xenophobic nature against monsters since it violated the ancient pact of not involving foreign forces due to the... last time. however, they did it and since they didn't pick combative powers the god could have used to defeat the leaders or a skill like cooking that could have been used to pacify the demons and monsters over generations so the humans could pull a dick move the god was left with an impossible task. but all was not lost as he realised that he could subjugate the demon's and monster's DNA by altering the biology of the human to make them a futa with apex genes. but the kicker is that to fulfil the human's wishes the god had to do the best of his ability which resulted in the subsequent heirs not only being the strongest, smartest and sexually capable but that their wills and spirits could break free from the gentle whims of fate. because of this the offspring instead removed themselves from the flow of politics and the like, instead usually only leaving to go on journeys to find their future mates.