Hinnyuu Kyonyuu Hisutorii

Ah, sweet revenge... Her brother, Shigeto, always tormented her about her flat chest. But then she suddenly blossomed--big time! Now she tortures him with t-shirts and jiggling around in front of him. But Shigeto avoids her and has grown cold. Did she push her dear little brother too far? Or maybe she hasn't pushed him far enough...