A tall, beautiful mature woman with a girlish charm, "Shirakawa Hanasei", takes on the challenge of developing her 'porcio' for the first time! First, Shirakawa inserts a dildo to confirm the location of the porcio, which is at the very back of her vagina. As she inserts and removes it herself, she feels good and climaxes, and then he thrusts it even deeper! She moans and distorts her face, but as if it's become a habit, he thrusts it in and out again, and she climaxes again... The man's long fingers reach her porcio and finger her at that position, and she convulses while peeing herself! When the man pinches her porcio, or 'cervix', with his fingers and shakes her, she starts breathing heavily, writhing her body, and writhing in agony! On all fours, Shirakawa has her fingers thrust even deeper, and her hips jump up and tremble, and she can't stay sane anymore! In the end, she is already gasping before the big dick is even inserted, and her body is craving a dick. Finally, the big dick is inserted and Shirakawa's lower abdomen is slowly pressed with a hand. She looks anxious in this unknown territory, and in no time at all, she is made to climax! In a crawling position, her body screams with pleasure that she has never experienced before, and she collapses onto her elbows as she climaxes. Shirakawa, who has been made to climax over and over again while her uterus is shaken and she writhes, hyperventilates and is in a state of surrender... She is so terrified by the overwhelming pleasure of this 'pleasure experience' that her entire body is taken over by her portio!