Obsessed with his beautiful aunt, a man follows online instructions to make an aphrodisiac and brings it along when he stays at her home for the summer. Behind her back, he increases the dose one drop at a time. Her body grows hot, her breathing turns ragged, and she twists with uncontrollable desire. On the tenth day she finally loses all restraint and throws herself at him, becoming obedient and eager to serve his every sexual demand.