You decide that you don't want to be inside of Krystal's ass when she really has to shit, and you have an idea of how to get out. If you squirm just a little bit deeper, you can massage the nerves in her rectum, and she might be forced to crap you back out!
Already, a thick, somewhat clear slime is beginning to leak into the chamber, helping to lubricate you. Bile, slightly acidic juices left over from the stomach and upper intestines, though not dangerous to you, and not nearly as fowl as the waste around, or that's approaching. Soon, your shit covered body, is coated in another thick layer of goopy slime...
You begin to squirm as hard as you can, reaching your arms out as your paws/hands reach the tight sphincter to the blue vixen's colon. Despite an incredibly fowl stentch that makes you throw up slightly in your mouth, you begin to massage deeply, and squirm as hard as you can, trying to massage the internal nerves...
Krystal blushes as she feels you wriggling within her bowels, not exactly sure what you're trying to do yet! "Ohh hon... That feels good..." She presses lightly into her stomach, as the rectum squeezes lightly around you...
