The innermost part of the vagina where this sister shows an abnormal reaction, around the cervix. Repeatedly aiming the piston only at the back on purpose, the uterine ostium that was made to fully open during the climax of the bankrupt face like a laughter is suddenly finished with an outrageous ejaculation. At that moment, she was no longer the Kanako you know, with her expression on her face as she said her goodbyes to her human world.
