A beautiful older sister visits her younger brother's room after he leaves his parents' home and starts living alone. When the younger brother sees his older sister, who has somehow become a grown woman, he loses his reason to her beautiful breasts and voluptuous body, and his suppressed emotions explode. He sets up multiple cameras to secretly film the forbidden acts he and his beloved older sister engage in. The older sister, who thinks her younger brother is innocent as he devours his grown-up sister's body in a frenzy, gently guides and embraces him, deepening the bond between the two of them in their own space...