Fics like The Horned King

When Sora and Riku get caught kissing, they decide to take a brief trip together to avoid the teasing... but then crash the ship in a world that somehow manages to be more frightening than the Realm of Darkness and has the cruelest villain they've ever met—whom they manage to get captured by. Their friends, realizing the two boys are missing, go to rescue them. (No knowledge of The Black Cauldron characters/world required to understand).

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