>>57108301I think why it works with him is because while he is bipedal and still can use his forelimbs as arms, meaning he is able to hold you or do other more human-like activity, he has other anatomical features which estrange him more than other bipedal monsters.
Non-human hip and shoulder structure, the head tapering from the neck up instead of bulging out etc.
So he is familiar-looking enough to imagine him as a bf while still animalistic enough for that extra thrill of being a monster.