Botan x Human
They are halfbreed Ogres. Because all the male Ogres died and their race was in danger of extinction, the matriarchs decided to procreate with humans.
But mating with humans were forbidden as it could be a factor in weakening the race.
Therefore, Ogres picked out the strongest human by fighting and testing them, then mated. and made babies as many as possible.
Somehow, all halfbreed babies were females, so they had to continue this procedure.
And then they became more and more humanised by generations.