ROYD-199 我的妹妹长相朴素、性格文静，但一摘下眼镜，竟是位惊艳的美女。我实在按捺不住，便上前搭讪，结果她让我第一次体验了不戴套的内射。西野惠美

The plain sister-in-law has been transformed! With the advice of her brother-in-law, she has become a beautiful woman that everyone turns their heads to see! However, the brother has always liked her… He decides to confess his feelings to her before someone else steals her away! He expresses his feelings, but she rejects him because they are brother and sister. The brother says, “We don’t have to put it in, just rub it together…” and they only promised to do a bare thigh job, but of course it doesn’t end there… Once they do it, it doesn’t end there, and they do it over and over again… The sister-in-law gradually becomes attracted to her brother…