Fuck Buddy

Ever since Ryou, who has an insatiable libido, encountered his school's #1 playboy, Akanishi, during their senior year, the two have become inseparable as "threesome partners" who go out on the town every night to pick up girls together. When one such three-way goes wrong and leaves Ryou with an injured penis, Akanishi nonchalantly offers to help him masturbate... Using a method that Ryou never expected but which he soon becomes hooked on. (Source: Fusion Product, translated) Note: Includes one extra chapter.