A woman is in her 30s! Rui-san has no boyfriend and usually spends her time reading erotic novels. It's a waste not to use her E-cup breasts, so let's let her release her suppressed sexual desire to the fullest! Rui-san, who was modest in the face of the boundless desires of middle-aged men, gradually becomes bolder... After turning 30, she opens the door to a new sexuality! Rui-san's ripe body is wildly developed by the old man's huge dick, and she becomes completely infatuated and goes crazy!