Big Sis spent the night at the bar and can't find any dick, so when she sees her Little Bro's light on she decides to use the dick she claimed previously. Unfortunately, Little Bro is a nerd who turned in early on a Saturday night, so she decides to wake him up with a BJ. When he finally wakes up, she moves into 69 before finally sitting on Little Bro's face so she can cum. And she does. Hard.