By: RobManRobMan
Your friend's aunt is a scientist and recently she'd been looking for a volunteer to help her with a study. Once you heard about the money you agreed to help, no questions asked...
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As your tiny body was blasted by the putrid, boiling gas from your friend's aunt's ass, you desperately wished you'd asked more questions.
She was studying how your shrunken body would react over 12 month period being trapped in her ass. Your only breaks coming in the form of bathroom breaks, questioning/research gathering interviews and the occasional wash to keep you somewhat hygienic. Otherwise you are trapped between her ass cheeks, always crushed between the fleshy mountains or her body weight as she sat down. Her hips swinging as she walked, grinding you against her dirty skin.
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She didn't hold back. If she needed to fart, she did so. The point of the experiment was to observe your reactions to this environment, and farts seemed to be a big part of the environment her ass created.
A benefit to her was that your part of the study happened naturally. She barely had to interact, meaning she could continue other work at the lab at the same time and tackle two research projects together. All she had to do was keep you between her ass cheeks and check in once a week to note down how your week had been.
She'd be lying if she said it wasn't enjoyable. Her life could get pretty lonely, so having a tiny companion around in such an intimate place did give her heart a flutter. Who said science couldn't be fun...?
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3 months of the experiment have passed so you best get settled in. She won't let you leave until she has all the data she wants.
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Welcome to your next few months...