I'd say if you are doing one long story you could do Chester got an idea after giving white girls to blacks and Mexicans he wants to explore "exotic girls" (black, brown, Asian), of course white girls are always on the menu, or if you are going to do a longer story you could have them keep taking girls and trading them off to random people, and then the Farmer hears about it and they start a business deal and then shenanigans can ensue, but I know whatever you write will be awesome