You knew what you were in for when you asked Agnes Tachyon to be your trainee at Tracen Academy. She was always more interested in experimentation than racing, so it wasn't a shock when you began to be roped into her experiments. You were not just her trainer, but her "Guinea Pig".

But where you found yourself now certainly wasn't expected. It started as any other day normally did, you met Tachyon in the halls of the academy and she handed you a potion to drink. Drinking or doing some other small experiment was what you normally had to do to get her to put some work into her racing training. The potion had a perplexing taste, a mix of pineapple and... perhaps barbeque? As you stared at the beaker, trying to nail the flavor profile down, you suddenly felt your body tugged forward and enveloped in something warm and tight. It didn't take long for you to realize what was happening, nor did it take long before you were swallowed so far in you had no chance of escape! It seems as though Tachyon had learned about the practice of vore that was sweeping through the student body of the academy and wanted to experiment...

As you curled within the stomach of your trainee, all you could hear (besides the gurgling and bubbling of the organ you were in) was the voice of Tachyon, laughing while saying:

"Guinea Pig... Let's test how long this anti-acid you drank lasts~"

Better settle in, I am sure once the potion begins to wear off and she has the data, you will be let out.

Right?



This is another great lineart created by  Wasabiart (that you can find the original here: https://aryion.com/g4/view/1097239) that I wanted to color because I want to spread the series Uma Musume to all. And definitely not to get more people to draw Umas. Not at all :)

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