Kono Kankei wa Gouhou desu!
この関係は合法です！
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-Description
YES Sister, NO Touch! Kouta, who is an extreme sis-con, decides to move out and live alone in order to "escape from his little sister." One day, however, he picks up a runaway girl named Ui, who clings to him and acts just like a little sister. Although she looks and acts like a child, she is in fact a beautiful 19-year-old girl with big tits! Protect this girl like a real sister? Or dare he cross the line? The days of agony begin! (Source: Magapoke, translated)