A beautiful and attractive older sister who is active in the rhythmic gymnastics club! When her brother sees his sister in a gorgeous leotard practicing at home, he accidentally mixes a powerful aphrodisiac he got into her drink, and pretends to be concerned about his sister's strange behavior, but he touches her sensitive body and destroys her reason! The sister, who is completely turned on by the aphrodisiac, sucks on her brother's hard, erect dick and inserts it herself! Her reason completely collapses due to the powerful aphrodisiac, and she cums in a back-arching climax while still wearing her leotard!