The subjects are contorted into objects like chairs, table or any other weird shape 

Simple as that- messing and wetting in diapers, that's a pretty heavy kink. A lot of normal furs don't like it, but it's a pretty big niche.

you know... to spice up things a little

a species based off the head canon of homestuck trolls having both a tentacle like dick and a cunt.

I know it's an uncommon one but it would be a fun addition, potentially borrowing on the codebase for climax for characters to sneeze. There doesn't need to be any mess alongside it.

some people like to live a little dangerously

this would include biting, cutting, licking, using as lube, etc