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My parents remarried and I got a new step-sister. She doesn't assert herself much, she tends to go with the flow, she's weak against pressure, and she's willing to accept a little bit of sexual harassment. What's more, she doesn't wear a bra at home! I took advantage of her personality and sexually harassed her every day! Of course, she didn't like it, but she couldn't refuse, and she kept touching her nipples. As she was teased every day, it gradually became a habit for her, and finally she told me for the first time how she felt, saying, "Big brother, I want you to touch my nipples."