Harker had learned to acquiesce with the presence of the wolf by his side.
It was never an easy thing to do, trying to get along with someone you don't really like. But he had actually been long used to it. When he was a child, when he grew older, and even after he became a demon lord. Pretending to be nice had been a normal part of his life, and perhaps to everyone's lives.
It's a mode of survival, acquiescence. You cannot survive with everyone despising you. You'd need allies, even when you distrust those allies and wouldn't sleep next to them without a knife.
At night, Harker would sleep closer to Blank and keep Ahanu and Joan as far away as possible. When asked why, he would make the excuse that he had the curse of the wendigo now and had to be looked after.
When really, it's him looking after the unpredictable suicidal man.
