The whole family is incestuous

Charly and Mickey are holding the game console and won't let Billy or Joshua play for even a second. To settle the score, the group of step-siblings make a deal and whoever gets the highest score in the game gets the console for the rest of the day. After Billy and Joshua win a landslide, they get the bright idea to bargain – If Charley and Mickey let them have sex, they could have the console for a whole month.