Riley Jean and her stepbrother, Tyler Steel, have been fucking each other since their parents got together. They go together to visit Frankie, Riley's grandpa. They go to the couch to watch some golf. Riley asks for a blanket. She and Tyler share the blanket, and moments later Riley has popped Tyler's stiffie out to give him a handie. In return, Tyler lets his hand creep over to rub Riley's meaty twat. They're so into each other that they don't notice that Frankie has trailed off and fallen asleep. When Frankie's snores alert them, the two stepsiblings give up all pretense of hiding what they're doing.

Riley throws the blanket off and goes to town sucking Tyler's cock. Her enthusiastic BJ only ends when Frankie wakes up and nearly catches them in the act. They have a normal conversation, then Tyler goes back to work rubbing Riley right and then delivering a hot finger banging. He insists on laying Riley on her back so he can feast on her cream filled fuck hole. Then he slides her panties aside and settles between Riley's thighs. Riley does everything she can to hold the moan as her new brother fucks her with Grandpa right there in the kitchen. He once again nearly catches them, but the blanket saves them.

As soon as Frankie sits down on the couch again, he nods off. Tyler takes the opportunity to pull Riley on top to ride his fuck stick. Grabbing Riley's firm ass, Tyler presses his palm against her anus to double down on her pleasure. When Riley turns around for a reverse cowgirl ride, she holds nothing back, including her own mewls of pleasure. Then she gets down on her knees with her face planted on the couch so Tyler can tongue her ass and then give it to her in doggy. Their wild pussy pounding concludes with Riley on her back taking a creampie of hot cum. As Tyler's jizz drips free from Riley's snatch, Frankie wakes up and finds his beloved granddaughter naked and cum covered. Tyler tries to convince Frankie it's a dream, but Frankie chases him out and tells Riley her dad is going to hear about it.