Vassalord and Genwaku no Kodou
You problably read these already but Crimson Spell, Konya mo nemurenai and kami-sama no lutoori are three really good ones :) if you like fantasy yaoi ;)
check out my yaoi fantasy list
http://www.mangago.zone/home/mangalist/8347/
it`s noted down in the reviews which creatures
i`d recommend to start with
http://www.mangago.zone/read-manga/tenshi_no_tame_no_shohousen/
Madness
Can anyone suggest some fantasy yaoi manga? The best would be if one of them is a human...