Airi is a girl who is troubled by the large breasts she inherited from her mother. Airi's shoulders have been bothering her lately because of her F-cup breasts, so her brother who loves breasts gives her a massage. Her slender body and large breasts are enough to make her brother's patience run out! The massage techniques become more and more erotic as he kneads her breasts... Gradually, the sister starts to feel aroused as well, and the mood becomes more and more exciting. The erotic brother and sister are turned on and start craving each other's bodies!