In Tokyo, I live alone in a cramped apartment. Suddenly, my life with my sister (May) living together began. Before I knew it, May's breasts had grown enormously. At home, she is completely unguarded and always in a state of accidental exposure, leaving me at a loss for where to look! Unable to hold back any longer, I forcibly assaulted her and finished inside her… But that night, "I've been feeling frustrated too..." May came to me, demanding internal ejaculation sex!? We have a secret relationship that we can never tell our parents about…
