Link to Japanese Fanfiction
http://www35.atwiki.jp/anozero/pages/3341.html
An interesting Japanese fanfiction of a crossover of Zero no Tsukaima and Nanoha, wherein Louise summons the White Devil to Halkeginia.
An alternate title plays upon a pun on the 'Ma' kanji, the end result is that the alternate title becomes: "Zero and the Demonic Cannon Girl".