A more general anal vore model focusing on exclusively furry images of characters roughly equal in size whom one is inserted head-first into the other.

Main tags are:
anal vore, same size, head first

And then smaller catagories of:
head in anus, torso in anus, tail in anus, feet in anus, butt in butt

Mainly e621 and Danbooru tagging, with tags like 'dragon prey' horse pred' and so on as well as '[color] skin' tags.