hi anon! sorry for the late response, i had some stuff typed out then my browser crashed...
anyway there's a vamp au floating around that's fairly popular (ft. leo/n) and long, if you're into that (http://inkin-brushes.livejournal.com/tag/au%3A%20vixx%21vampire)
also there's an exchange you can check out that has some good fic, though i don't know about leo/n specifically (http://forvixx.livejournal.com/tag/pairing%3A%20n%2Fleo) that's their leo/n tag haha
sorry i can't help more...i'm not super into this pairing and actually not super into vixx ficdom either, but other people might be able to help you out! let me know if you want me to poke around more or anything~ or want to talk fic!
Re: http://kficanon.dreamwidth.org/13895.html?thread=52137543#cmt52137543
anyway there's a vamp au floating around that's fairly popular (ft. leo/n) and long, if you're into that (http://inkin-brushes.livejournal.com/tag/au%3A%20vixx%21vampire)
also there's an exchange you can check out that has some good fic, though i don't know about leo/n specifically (http://forvixx.livejournal.com/tag/pairing%3A%20n%2Fleo) that's their leo/n tag haha
sorry i can't help more...i'm not super into this pairing and actually not super into vixx ficdom either, but other people might be able to help you out! let me know if you want me to poke around more or anything~ or want to talk fic!