The global epidemic has taken the lives of almost all people on earth. Only a few were able to develop immunity to the virus. When the epidemic has passed, it became clear that women are much more immune, than men.
Many societies adopt a law of female enslavement and creation of "forced harems". Every man can take as many women as he can afford. For some people, this became a profitable business. Including you.
You act as a trainer and provider of sex servants. Buy newly caught girls at stock, train them and resell at auction. Take care of your girls, so they don't get sick or insane. For well-trained girls, auction visitors can offer a high price. If possible, send girls to work, this will bring you additional income. You have to keep an eye on the house and clean it of garbage. Improve your skills and earn as much as possible