Your right hand was the least embedded in the shit. You were able to work it free. With it free you work the rest of your body free, and fall into your sister's rectum just as the log you were attached to disappears back into her colon. You look around at the new roomy and surprisingly clean space you're in. Out of all the places you've been in your sister this is by far the most pleasant. The smell isn't bad and there isn't any poo that you can see. The interior walls are a soft pink, and coated in a slime that makes you slip a little when you walk. You make you way closer to your sister's anus. Compared to you the clenched opening is huge. You walk up and try to push through it, and you're able get a hand through it, but it clenches and pushes you out. You decide to try again, but with a little help.
As disgusting as it is you bend down and coat you arm with as much of the slimy substance you can get off the floor "Any kind of lubrication has to help a bit" you think. You look at your arm coated in the slimy, gel like substance and you push it into your sister's anus. SUCCESS! You were able to get you arm in all the way up to your shoulder! But your joy is cut short...your sister rolls, and there is a gurgling sound coming from behind you. You look back and suddenly the turd that you were attached to pushes through the entrance to the rectum, and the opening ripple releasing some type of gas into the chamber. The anal sphincter that you have your arm in pulses, and then suddenly opens releasing the new gasses expelled into the chamber. As it opens you are flung out into you sister's panties. You look around at you new cotton prison which, you are disappointed to see, was smaller than your previous accommodations in your sister's rectum.
The smell of a fresh fart is heavy in the air, but slowly lingers through you sister's panties. You sister rolls over again, and stops on her stomach. You land back on her soft anus, but quickly scramble off to make sure you don't "accidentally" get sucked back in.
You look around at your new surroundings. Flesh and white cotton panties. You walk around trying to find a way out of here, but the only open path leads towards your sister's vagina...
