Rin, a brother who loves older brothers, was itching to have sex with her older brother, but the common-sense older brother doesn't see his younger sister as a sexual object at all. ``That's right, you can use an aphrodisiac!'' Rin was inspired and decided to do something outrageous by dousing her brother in an aphrodisiac! The aphrodisiac caused her brother to lose his mind and his erection wouldn't stop, and the younger sister who loves him has sex!