Kannazuki seems to have a very friendly relationship with Shido. He was willing to show Shido a news recording of the incident of five years ago in order to try and help him regain his memories and was concerned when Shido lost consciousness afterwards.
He was also the one who took Kotori's place of instructing Shido when Shido and Kotori were having their date to seal her Spirit powers.
Because of his various and bizarre fetishes, Kyouhei sees Kotori as his "master that he wants to serve" and would obsessively provoke her to attack or punish him which due to his masochism, would excite him. Although he does not seem to mind the abuse, Kyouhei would still beg for forgiveness when Kotori threatened to castrate him.
Kotori treats Kyouhei poorly due to his antics and tries ignores him most of the time. However, she still trusted on his advises at times and even allowed him to command <Fraxinus> when she was not present.