Seikimatsu Tantei Club

Fin de Siècle Detective Club is dedicated to the very gay and very passionate love of Sherlock Holmes and Doctor Watson. I suppose that it could even be called a doujinshi, since it's blatantly based on Conan Doyle's work, and many of his characters make appearances throughout the story. In fact, the main story is split into three stories -- each one focusing on a different aspect of the Holmes/Watson relationship.

(Source: The Pink Panzer)