My stepsister Momo is the daughter of my father's new wife. She was the polar opposite of me, withdrawn and warm and friendly to anyone. However, because of her overly open personality, I wasn't treated like a man in the house, so she had to live in a completely revealing thong, defenseless. I had never seen a bare ass before, and one day, as I kept thinking about my stepsister's ass, my libido reached its limit...