Despite having just remarried, Miyuki's husband has not paid her any attention. Fed up with her workaholic husband, Miyuki ends up having a sexual relationship with her stepson on a whim. She made the mistake to spite her husband, but she gradually becomes Kokoro by her stepson's cock. Even though she regrets that things shouldn't have turned out this way, her body is craving pleasure, contrary to her Kokoro. Today, with her crotch getting wet, she eagerly waits for the moment her husband leaves the house...