The innermost part of the vagina where this beautiful girl shows an abnormal reaction, around the cervix. Repeatedly pushing the piston through the nasty twitching villains that don't suit her face, and finishing off at once with a ridiculous ejaculation at the uterine ostium that has become fully open at the climax that her neck is jerky. At that time, she was crying and laughing, and she was no longer the Kokone-chan you know.
