Please enjoy this discovery of a modest collection of magazines. Lots of mud, paint, quicksand, and pies, and needless to say, plenty of hentai sex and nudity.

I do not speak Japanese so I can not provide any context, but I do know you read the panels right-to-left.

https://nhentai.net/group/mamiretei/

Theres lots to be found under the "Slime" tag on that site as well.

https://nhentai.net/tag/slime