In this adult family role-play, a curious, sexually adventurous stepsister bombards her studious new stepsister with questions about masturbation, boyfriends, and sensitive spots. She begins touching her until the reserved woman can no longer hide her pleasure, gradually awakening her body. Later she drags their adult stepbrother into the action, turning it into a taboo threesome that leaves the once-serious stepsister making a dazed orgasm face and climaxing again and again.