I need more CR with you so I'm just gonna throw Add at both of your boys >:(! He'll be way more sociable/nosy once he's a god anyway.

He's probably going to continue disliking/distrusting Hakkai since he's friends with Hibari but... he wouldn't be freaked out by the whole youkai thing for what it's worth. Aside from Add having his own weird mutations, he knows like three different people from his canon with varying degrees of being a demon, so hey nbd.