A big-breasted older sister with a voluptuous body and a younger brother with a rock-hard dick who loves his older sister go on a trip to a hot spring together. The older sister gives a gentle lecture to the younger brother who is curious about women's bodies, and uses her dynamite body to do lots of erotic things. The younger brother's dick is rocking more than usual to the gentle older sister who is full of maternal instincts. The older sister also cums in agony due to the younger brother's hard piston. I wanted a sister like this, a sister who can climax in various places such as open-air baths and inn rooms!
