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Tess was a cursed mare.

Ever since she was a young foal she had been stalked by a bizarre phenomenon. Roughly once a month, for one day at a time, she'd find herself trapped in a strange alternate world. Though saying "once a month" made it sound like her curse was more predictable than it really was. She had once suffered an entire week that sent her back every other day. Then there was a time she went three whole months without a single incident. Simply put, there was no way to know when Tess was about to disappear into that other world. The only certainty was that she was always taken during her sleep and that she always returned after exactly 24 hours, awake or not. It was a frustrating problem. Especially because nopony ever believed her.

The first time it happened her parents had, understandably, freaked. Their little girl had simply vanished in the night leaving no clues behind. Then Tess just reappeared the next day babbling about an alien world. They were obviously not in the mood to listen to her made-up story and immediately grounded her for "running away". Then it happened again. And again. And again. Every time she was punished. Every time nopony listened. Eventually it just became a part of her life. A part that frustrated Tess and led to unfair judgments about her.

In school the rumors flew. Where did she go when she disappeared? Was she in a gang? Sneaking off to be with a secret boyfriend? Was she really a changeling spy?! Too many believed she must be up to no good. No matter how many times Tess tried to tell them her claims were simply dismissed and she was branded a compulsive liar. She felt so alone.

What was this alternate world like? Tess could only describe it as a miniature version of Equestria. It was a world where the tallest trees were only as high as her knees. Where everything was small and delicate. Where mountains were more like steep hills. Where expansive grass fields felt more like somepony's backyard. And it was a world populated by tiny bipedal creatures who built sprawling cities. She couldn't speak their language and even trying to talk to them caused problems. But she knew they were intelligent from the first time she arrived. After all, they acted nothing like animals or bugs. They acted like ponies. So... they usually ran away from her while screaming.

Tess couldn't blame them. She was a towering force of nature. She could have easily laid waste to their miniature world if she wanted to. Yet, despite her frustration with being there, she didn't hold it against them. She was fairly certain it wasn't their fault. Otherwise they would have appeared much more prepared instead of surprised and terrified every time she arrived. Something supernatural was going on and while it only caused minor problems in her life, the tiny creatures obviously suffered far more.

Tess tried to explore whenever she was taken to their world, if only as a way to pass the time until she was returned home. However, her every step usually broke something. But it wasn't on purpose. She didn't intentionally rampage through their cities and even strove to go around them. But the suburban sprawls could be enormous. Sometimes she was simply trapped by their civilization. Each time she woke up in their world she was in a new location. Usually Tess found herself in the wilderness, but there were a few occasions where she was teleported into the middle of a city. Crawling off a pile of rubble she wasn't even conscious while making was the worst. Like someone was trying to set her up as a monster when she really didn't mean the little ones any harm. She was always careful and the thought of hurting someone or something on purpose terrified her.

Well... except for that one time...

It was the most important day of her life. Tess had a date with the stallion of her dreams, Bar Bell. He was stoic. He was polite. He was handsome. He was fit. Somehow Tess, the mysterious mare who disappeared every month, managed to catch his eye. Everything was going to be perfect...

Then Tess woke up the day of her date in the middle of a miniature forest.

That was the ONLY time she ever rampaged. When she obliterated that collection of trees. For hours she tore stupid leaf covered sticks from the ground and used them to beat their neighbors to splinters. It was a fauna massacre. She let her female fury loose and you could tell. There was nothing left but a broken battlefield of plant genocide when she was done.

Tess then spent the next three visits apologizing to every little one she encountered.

Author's Note

Too many stories in the size difference community are about twisted individuals purposefully traveling to alternate worlds to terrorize tiny helpless peoples. So, in my continued quest to defy the norms of this community, I decided I wanted to entirely flip that too common trope/scenario. So poor Tess doesn't teleport willingly and she doesn't want to hurt the little people. Though I do realize this piece would be much better as a real short story, I chose to be lazy. I summarized the premise rather than actually use it. Oh well. Maybe this inspired another creator.