The innermost part of the vagina where this beautiful woman reacts abnormally, around the uterine ostium. Aiming at that, the piston is repeated repeatedly, and the uterine ostium that has opened irresistibly at the climax that makes the line of sight blurry is suddenly pointed at a ridiculous ejaculation. At that time, she looked as if she had quit humans, and she was no longer Yui-san, who you all know.