Katelyn Brooks gets the power of the Que, from Star Trek. There are several versions.

(Formerly titled "Giantess/shrinking & farts - Spending time with 'Auntie' Sheila")

One day, for reasons that escape your comprehension, you shrink really small (ranging from about 1/2 inch to 1/10 inch or 1cm to 1 millimeters approx.), and you don't really know why. Did someone do it? Did something cause it? Who, or what? Unfortunately for you, you won't get many chances to find out, as you have to try your best and survive as you're not alone. The girls that you were just hanging out with or happened to be around are now seemingly impossibly gigantic. You might try to alert them of your presence, but that might not end up being the best idea.

[This story is sort of a spiritual successor to TinyMan0001's 'Giantess/fart shrinking' stories, though not intended to be a carbon copy of it. One difference is that whether farts shrink you is up to whoever is writing, though I at least chose to leave the cause of shrinking mysterious at the beginning, and also because it slightly contradicts some backstory (I also left open the possibility for a girl to intentionally shrink you). However, like it, it's largely focused on the shrinking side, though I guess I can leave a branch dedicated for a giantess/growth route if anyone's interested on adding to that. Also, similarly, the girls may be aware or unaware of your shrunken form. Usually, I'd say they should progress from unaware to aware, depending on the girl and the situation though.

This story is a more user-friendly display for the interactive I made at Writing.com, though here we have to do away with the ability to have other people directly add chapters, and instead I'll be posting the more relevant routes done so far.

Original link here: https://www.writing.com/main/interactive-story/item_id/2234425-Giantessshrinking--farts

PS: The Giga tag was just selected in relation to the main character's perspective, this is mostly a shrinking story, not growth focused, though a growth route may be done in the future.

Marion grew into a 10 Mile tall giantess - and a small man is trying to survive her impact on his city.

Aliens examine a sample of our world to gather knowledge about the terran civilization. When they try to return the sample Jenny gets involved and is enlarged to phenomenal size. She needs a long time to find out what has happened to her and then some more time to accept her new life.

A girl keeps a tiny city in her room and uses it to satisfy her own carnal desires.  She lets her friend in on her secret and worlds change...

Aubrey has a run in with some thousand-foot tall girls.

Disclaimer: All publicly recognizable characters, settings, etc. are the property of their respective owners. The original characters and plot are the property of the author. The author is in no way associated with the owners, creators, or producers of any media franchise. No copyright infringement is intended.

A smutty (and cruel) giant couple story with a simple premise. 

It's in Mideval times...Giantesses rule the world... but a band of Knights and random characters called the Freedom Fighters are going to give it one last shot.