Blake Blossom is in charge of her stepbrother, Jay Romero, and she's determined not to screw it up. She packs Jay's stuff for school in the morning. Later in the afternoon, Blake walks in on Jay watching porn and masturbating. She decides to have a talk with Jay about being such a fapper. She tells Jay he can't be jerking off all the time because he needs to talk to real girls. Jay confesses her likes Blake's boobs. He claims that if she shows him her tits and he resists then he's making progress. Blake flashes Jay her breasts and Jay manages to not touch. Next, Blake shows Jay her ass. This time, it's harder to resist, but he does. Next up is Blake's pussy as the ultimate test of Jay's resistance.

Jay can't resist, so he tries sticking just the tip in. Blake calls him on it, but he justifies that this is the final test. If he can stand just the tip, then he has passed! Of course, Jay lets the whole thing slip in. Blake eventually agrees that it's okay and that maybe they can go a bit longer and faster. That's all it takes for the stepsiblings to really get it going in their hardcore romp.

Once Blake has accepted that she likes her brother's cock inside her, she pushes him onto his back and climbs onto his stiffie to ride him. Jay gets the chance to finally squeeze and knead his sister's big boobies to his heart's content as Blake rides him in cowgirl. Then she turns around and lifts her legs high so that Jay can fuck her from underneath. Rolling off Jay's D, Blake shoves her jugs together for a titty fuck that she combines with a blowjob. Getting on her knees, she takes it from behind. As Jay bangs Blake, she begs him to cum inside her. With her brother's jizz dripping out of her pussy, Blake confesses she's not on birth control.