https://www.pixiv.net/artworks/135564079

高潮相扑大赛（第一届？）

Two women on the stage are manipulated by a program to touch their clitoris. A thin tube is connected to their urethra, and there is a small ball in the tube. The one who can hold back their orgasm and capture the ball by the urethra wins. So, hold back and don't climax!