The innermost part of the vagina where this beautiful girl shows an abnormal reaction, around the cervix.She repeats the piston over and over again with a meat stick that reaches deep inside, and finishes off with a ridiculous ejaculation at the uterine ostium, which is irresistibly accepted by the climax that the chin jumps up.At that time, she showed her completely out expression as a person and was no longer the Yuu-chan you know.