>>98540179Because Zuko and Azula are much more obviously fucked up/"damaged," and that's what the Tumblr artists and shippers like.
Even though you could make the case that, since Sokka is the only male older than a child in the entire South Pole by the start of ATLA, Watercest is statistically more LIKELY than Zucest. I mean, who else is there around for Katara to experiment on?
