Name of a manga

I'm trying to find this manga I read once; all I remember is it was a shounen-ai and the two main characters were like adoptive brothers. The one was adopted into the family to serve as the vessel for a demon/curse thing that is effecting his body, like I remember one chapter it really effected his legs and he couldn't really move much. The other guy was actually a member of that family and was really protective of the one with the demon/curse. They were dressed traditionally, in kimonos, if that helps.