Different pairings each chapter. Involving anyone in the Naruto series, the chapters do not connected, it's rated R for a reason be warned. I take n requests for pairings.

Together, these siblings form [Blank], but when their opponent becomes each other, they are simply Shiro and Sora. After breaking a streak of ties, Sora discovers that something is bothering Shiro, and proposes that they play new game to find out what. Shiro x Sora. Lemon in later chapters.