https://ponerpics.org/images/2982854?q=crotchboobjob
Not entirely sure, but I think I fapped to this in the past. In the last year range.

Does this exist: porn involving coral. Coral is an animal, similar to a jellyfish. This video explains coral anatomy: https://youtube.com/watch?v=F4rJYW-kb10

Clop involving seaponies likely exists. I have not sought it out.