Sister Negotiates Car Deal That Turns Into Secret Hookup

She begged him to borrow the car for a night out with friends but he hesitated knowing how reckless she could be. He suggested a little deal to make it worth his while and soon their teasing escalated into heavy making out on the couch. Before either realized it they could not keep their hands off each other sneaking quick sessions whenever the house was empty. The tension kept building until they were both obsessed with finding new ways to get each other off quietly.