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.
*All characters depicted in this work of fiction are adults, regardless of their visual representation or textual description, and are not based on any real person*