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This article, Attack of the Twin Demons, contains content taken directly from our mother site. All credit of such content is reserved the original authors over at Narutopedia, the original article can be read here: "Attack of the Twin Demons".
The technique allows Sakon and Ukon to merge their bodies using their kekkei genkai. Typically, Ukon is dormant within Sakon's body, with only his head protruding from the back of Sakon's neck, although he can move freely inside of and protrude any part of his body parts from anywhere on his brother's body.
Kabuto's usage of this technique differs as it merely creates a copy of Sakon that has the ability to access the DNA of and morph into the other Sound Five members (Kimimaro, Kidōmaru, Tayuya and Jirōbō) and Orochimaru through the integration of their DNA into Kabuto's main body. When he used this technique, he called it "Sakon: Twin Demons Technique" (左近・双魔の術, Sakon: Sōma no Jutsu).