[Warning, slight scat]
The large Zebstrika is standing up, he is male and is slightly worn out.
You stand behind his back on top of a flower, you hear the Zebstrika yawn as it's ass comes flying towards your face!
You have no time to react as his giant anus come crashing over your body, taking you in instantly, you feel his scat cover your body, it's warm as you're brought swiftly through his intestines, they massage you as they take you towards his stomach...
On the outside the Zebstrika just decided to sit down when he felt a jolting feeling in his ass, he stands up and turns around to see a flower on the floor and assumes it just tickled his ass when he sat down, he proceeds to lay on his stomach.
...You reach the entrance to his stomach rather unwillingly, you didn't want to go through a digestive system today but it looks like you will have too, you know you won't digest due to your powers but a meaty sack that smells of rotten grass isn't exactly the loveliest place to be.
You need to escape his body and his anus seems off limits, you'll have to wait until he gets to sleep.
After a quick groom the Zebstrika decides to have a nap, he is quite tired and wants to sleep for a few hours and wake up whilst the sun's still out.
Back in the stomach you've been waiting for about 20 minutes, you finally watch the entrance to his stomach lower meaning he'll be sleeping. You wait 5 minutes just to be sure and start to exit his system. You push through the puckered stomach entrance, you crawl through his system until you reach his muzzle. you walk out on his tongue, his mouth is like a cave, you walk up to his teeth and try to lift them, you can barely stand the stench of his saliva. You can't seem to lift his teeth and deduce you'll have to crawl through the small hole between his last tooth and his gums, you pull yourself through and make your way around his lips to the front of his teeth, you pull his lips up and step outside.
After that ordeal you're quite stinky, there's a lake quite close and you wash up, you return to your original position just outside his maw and decide to do something. But what?
