"小豆洗い", an ancient and sacred ritual, is brought to life in this breathtaking hentai masterpiece. Two shy, innocent sisters, Yumi and Mai, are about to experience their first taste of taboo pleasure at the hands of their brother, Kaito. As they bathe together, their bodies glistening with water and soap, Kaito enters, his eyes filled with a primal hunger. He guides their hands to his cock, showing them the ways of "小豆洗い". The sisters, though hesitant at first, can't resist the allure of the forbidden. They tentatively touch Kaito, their hands exploring his cock, feeling its heat and hardness. Soon, they're lost in a whirlwind of lust, their bodies entwined, their moans filling the air as they surrender to the taboo pleasure of "小豆洗い", their bodies glistening with sweat and desire.