親同士の再婚でボクに義理の妹が出来た。その妹というのが、めちゃ可愛いのだが、かなり内気で気弱な娘なんです。嫌なことをちゃんと断り切れないのをいいことに、毎日のようにチクハラ三昧！無防備な服装でノーブラ乳首のポッチをしつこく触っていたら、ヨダレを垂らすぐらいに感じまくって、乳首だけで何度もイッてしまうぐらいの変態女子に変身を遂げて行ったんです！最後には自分から「お兄ちゃんに乳首を触って欲しい」とちゃんと自分の意見を言えるようなしっかりした女子○生に成長しました！

My parents remarried, and I gained a stepsister. She's incredibly cute, but she's also quite shy and timid. Taking advantage of the fact that she can't properly refuse things she doesn't like, I subjected her to daily nipple harassment! When I persistently touched her nipples, which were exposed because she was wearing revealing clothes and no bra, she got so turned on that she started drooling and transformed into a perverted girl who could orgasm multiple times just from nipple stimulation! In the end, she grew into a strong-willed high school girl who could even express her own opinion, saying, "I want you to touch my nipples, big brother!"