My wife's younger sister, whom I met again after several years, has become an adult body.

It's been a long time since I've seen my wife's parents' house. So, seeing Chihiro (his wife's younger sister) had a different atmosphere made me feel a little nervous. Chihiro, whom she thought would be a child forever, has become an adult woman. I became aware of it as a woman. When my wife left and we were alone, I couldn't contain the carnal desire that had suddenly risen up, so I raped Chihiro.