Yukari lives with her husband and son Tsuyoshi. As the weather has warmed up over the past few days, it has become Yukari's morning routine to go and wake up Tsuyoshi, who cannot be woken up by his alarm clock. One day, while trying to turn off the alarm for Tsuyoshi, Yukari ends up touching his morning erection. Even though she knows it is wrong, Yukari moves her hips on her own, devouring the pleasure. From that day on, she becomes fascinated with the appeal of the cowgirl position, where she can take the lead and do as she pleases, but...