yaoi where the boy is mates with a mythical beast
Fantastic beasts and where to find them?
Mauri to ryuu?
http://www.mangago.me/read-manga/a_song_of_blood_and_fire/
http://www.mangago.me/read-manga/the_pressure_of_an_evil_spirit_sweetly_dripping/
konya mo nemurenai
thanks this is the one
yaoi where the boy is mates with a mythical beast