Inviting amateur college student siblings walking on the street to the studio under the guise of a love survey! In the intimate setting of a private room, they were challenged to a series of activities starting with bareback, then rubber-protected, and finally unprotected sex, with the older sister aiming to win a high prize if she could resist climaxing until the end! Even the sister, who seemed relaxed and even smiled during the rubber-protected act, was overwhelmed by the sensation of unprotected sex and experienced continuous orgasms! As sensitivity increased, many older sisters eagerly sought to be ejaculated inside their aroused genital areas!
