An adult step-sibling role-play built around a closed village's twisted belief that a sister belongs to her brother. No one objects—not even their parents—as the shy adult stepsister obeys him while studying, under the dinner table, or cooking in nothing but an apron. Though confused at first, she feels pleasure through her embarrassment, and the two discover an irresistible sexual chemistry. Across a long, feverish summer they repeat missionary, cowgirl, doggy style, seated sex, blowjobs, titjobs, handjobs, and creampies again and again.