My wife was hospitalized for childbirth, and her best friend came to help with the housework for a while. However, that best friend was actually my ex-girlfriend, Kasumi. Of course, it was a secret that I had kept from my wife, just between Kasumi and me... When we were alone, Kasumi let her guard down and unguardedly exposed her eroticism, and I, who had been frustrated ever since my wife became pregnant, was unable to suppress the rising sexual desire... and finally cheated on her!