an INCREDIBLY terrible list of reasons why the deep ones want to have kids with humans
some of them just think humans are sexy
their species isn't especially well-made and can't reproduce on their own - hybridization is their only option if they want to have children, the humans are just means to that end
sealing alliances with marriages and children isn't actually something the deep ones do, but it IS something humans have done quite a lot, and this is all a clumsy attempt by some very alien beings to follow the cultural practices of the people they're allying with - trying to keep everyone on the same page regarding the deep one/human relationship
if everyone is a deep one then when great cthulhu once again rises from the deep to reclaim the world they won't have to do any of that annoying "wiping out all of humanity" stuff, ugh
Maybe some humans find the deep ones to be sexy ?
I am not implying I find them sexy !
With their webbed hands, silky gills, impressive ridges .....
