So there is an artist named JERK Dibuja, who might not be into aquaphilia much, but has 3 UW items:
One that is Rio At The Mall, the one found at the previous thread that someone stumbled onto on Discord (UNCENSORED by the way).
Another is the Fairy Tail comic that is this:
https://kemono.cr/patreon/user/156409190/post/126688281
and The Sunken Cabin:
https://kemono.cr/patreon/user/156409190/post/126841809

Now what I remember that it was not exclusive to Patreon, though he did not post it in on Pixiv. In his honesty, he did mention that we may not plan to post them for a while.