Of course theres zelda yaoi! You're on the internet! If it exists, there is porn of it to be found (if no porn can be found, then it doesn't exist. Or it's being made)
Theres a section for it in the gallery on this site, and you can always count on there being a zelda thread somewhere in /y/ if the gallery here isn't good enough, yeah?
Link/Dark link can be good, and the smash bros stuff (LinkxMarth/LinkxIke etc) can be pretty awesome aswell ;D