As the siblings hear their parents' car pull into the driveway, Samantha, the stepsister, panics. Her brother, Jack, reassures her that they have time before their parents get upstairs; however, he has other plans. Jack slowly undresses Samantha, who is initially resistant but gives in to his touch. They share tender moments of love mixed with desire as Jack begins to kiss and lick her sensitive areas. Samantha moans softly, the tension between them building. Finally, they both climax together, their intense connection making the act more intimate than either could have imagined. Afterward, they lay together, their hearts racing, knowing they've just crossed a line they can't uncross.