親の再婚で、ボクに突然義理の妹が出来ました。すごい透明感でめちゃくちゃ可愛くて、正直どうにかしたいと思ってました。妹はかなり内気で、押しに弱く、自分の意見を言えない気の小さい臆病者でした。ですから、ボクが妹の乳首を毎日毎日朝から晩まで触っても、文句どころか、そのうち感じ始めてしまい、ヨダレまで垂らしてビクビク反応してしまう始末…。どんどん乳首の感度が上がって行き、挙句の果てには自分から乳首を触ってほしいとわざわざボクの所までやって来てお願いするほどです。彼氏がいるのにですよ？とんでもない変態です。

My parents remarried, and suddenly I had a stepsister. She's incredibly cute with a pure, innocent look, and honestly, I wanted to do something about her. My stepsister is quite shy, easily swayed, and a timid coward who can't express her own opinions. So, even though I touched her nipples every day from morning till night, she didn't complain at all. In fact, she started to feel pleasure, even drooling and trembling in response… Her nipples became more and more sensitive, and eventually she would even come over to me and ask me to touch them. Even though she has a boyfriend! What a pervert.