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1. STALLION UNLOCKED - The Agnes Tachyon Files by Piddleyfangs

   Fandoms: ウマ娘 プリティーダービー | Uma Musume: Pretty Derby (Video Game)  

   • Explicit
   • Creator Chose Not To Use Archive Warnings
   • F/F, Other
   • Work in Progress

   01 Sep 2025

   Tags

   • Creator Chose Not To Use Archive Warnings
   • Agnes Tachyon/Manhattan Cafe (Uma Musume)
   • Agnes Tachyon (Uma Musume)
   • Manhattan Cafe (Uma Musume)
   • Gold Ship (Uma Musume)
   • Mejiro McQueen (Uma Musume)
   • Corruption
   • cock growth
   • Smut
   • heat - Freeform
   • Transformation
   • girls with dicks
   • slowburn
   • Insatiable lust

   Summary

   In her search for greater and better speed no matter the supposed limits, Agnes Tachyon discovers a link between lost Uma Musume biology and a motivation factor that might drive the girls to be greater and better racers. Eager to prove her theory, Agnes begins recruiting loyal guinea pigs to test the effects of her newest drug. However, can the girls who try her medicine handle the intense feelings of arousal, or will they succumb to darker instincts and deep all controlling pleasure?

   Chapter 1 is the initial experiment with Manhattan Cafe, 2 deals with Gold Ship her struggle to be normal, and 3 adds McQueen who struggles to add another pleasure she must deny herself to her life.

   Series

   • Part 1 of The Agnes Tachyon Files: Experiments in Forbidden Uma Musume Biology

   Language:

   English

   Words:

   11,832

   Chapters:

   3/?

   Comments:

   7

   Kudos:

   221

   Bookmarks:

   26

   Hits:

   5,016