Ten is a tall woman with 173cm tall stature, and her two younger brothers Fuuta and Yojiro are shorter than her. Ten returns home for the first time in two years and treats his cute little brother like a child, but The younger brothers have always loved Ten so much that they would secretly masturbate using their older sister's underwear. One night, the three of them slept in a row for the first time in a while, and the short brother's long-held lust exploded, and they sandwiched him between their partners and fought over his heavenly body!