What if demons and angels can fuse (like in steven universe), but since none of them dance, it never happenned.

Except Crowley and Aziraphale know how to dance, and one day it happen, they fuse and they’re like, so confused, or felt something like that was possible and just pushed their luck to find out.

(Also maybe it hapenned before between Ligur and Hastur, but they freaked out and never mentionned it to anyone.)