Mayuko, who is ignored by her husband, has entered into a forbidden relationship with her son. (It's all his fault! I was just... lonely.) She makes excuses to herself like that, but the guilt only grows. However, Mayuko's body has become one that can only get off on her son's cock. Every day, she wets her underwear and waits for her husband to go out. And today, after seeing her husband off with a "goodbye," she licks and sucks her son's cock with the same mouth...