Dick Karuta

Rules of dick karuta:

● Both contestants are masturbating over the karuta cards
● As soon as the referee starts speaking, the contestants are allowed to ejaculate
● Whoever ejaculates first and their cum touches a card, can collect the card and get points
● The contestant who didn't ejaculate, must not cum until the next round, lest they get penalty points
● There are 3 minutes between the rounds
● Rounds continue until the entire deck of karuta cards is collected by contestants
● Physical contact between contestants is allowed
● There are special rules to resolve double contact (both players ejaculating at the same time on the same card) and a match draw, both of which involve even more ejaculations

Keeping all that in mind, enjoy a doujin about a single match of dick karuta between two futanari girls.

Also included is a short story about a match of "edging shogi", but we'll leave the rules for that one to your imagination.