After a time, the sister realized that they must propagate future generations, and so she blackened her face with charcoal so as to trick her brother into thinking she was an outsider and arouse his passions.
日久之後，妹妹想到必須繁衍後代，便以炭抹黑臉頰來矇騙哥哥，讓他以為是外人而成親。