Just three days after their parents' remarriage, a brother and sister—both only children—find themselves alone together for the first time. With their parents away, the boundaries between them blur as their conversation gradually turns toward the sister's sexuality. The sister confesses her discomfort with giving blowjobs, prompting her brother to take a bold and hands-on approach in teaching her. What begins as instruction quickly spirals into an escalating forbidden relationship, progressing far beyond mere oral sex. A story unfolds that intertwines sibling bonds with taboo desire, culminating in creampie-filled incestuous encounters between the newly formed brother and sister.