There is a super-powerful piston vibrator that makes Mahiro Yui come all over the place with its pursuit piston. She keeps thrusting her cervix without stopping no matter how many times she comes, and she can't stop squirting spasmodically due to the super-pursuit piston intercourse that never stops. The endless alternating insertion of the high-speed drill and the super-thick cock will make you dizzy and make you come like crazy. I would love to use it myself.