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My step-sister, Momo, is the daughter of my father's new wife. She's the polar opposite of me, a recluse, and is cheerful and welcoming to anyone. However, because of her overly open personality, I'm not treated like a man at home, so she lives defenselessly in a thong that's completely visible. I've never seen a bare butt before, and one day, I kept thinking about my step-sister's ass in erotic thoughts, and I reached my limit...