Around the uterine ostium, the innermost part of the vagina where this older sister shows an abnormal reaction. Repeating the piston that aimed only at the back intentionally, the uterine ostium that was made to fully open during the climax of the collapsed face like a laugh is suddenly pointed at a ridiculous ejaculation. At that time, she had a look of saying goodbye to the human world, and she was no longer the Kanako-san you all know.
