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I came to a hot spring trip alone with my "sister" without telling my parents. As soon as I arrived at the inn, I invited my sister in the open-air bath and inserted the meat stick deeply into my brother's hairless vagina. "Onii-chan... I love you." My little sister is still underdeveloped, but she's obedient and accepts whatever I do. A forbidden physical relationship between brothers and sisters who are crazy about their desires.