Fics like The Strange Case of Groundskeeper Jekyll and Penrose Hyde

Being a Groundskeeper is normally a boring job. Normally. Unfortunately, this is Tracen Academy, where normal was taken to a farm upstate a long, long time ago. So when he accidentally becomes Agnes Tachyon's test subject for a concoction that temporarily turns you into an Umamusume, it isn't very surprising. Although while she has the opportunity, she might as well see what racing actually feels like. It's not like she's going to get stuck as an Uma or anything.

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1. Tend To Her by sqwid (ウマ娘 | Uma Musume - All Media Types, ウマ娘 プリティーダービー | Uma Musume: Pretty Derby (Video Game), more)
2. Infinite Render Distance by EichanFlash (ウマ娘 プリティーダービー | Uma Musume: Pretty Derby (Video Game), ウマ娘 プリティーダービー | Uma Musume: Pretty Derby (Anime), more)
3. The Supreme Commander of Japan by RanaDelRay (ウマ娘 | Uma Musume - All Media Types, ウマ娘 プリティーダービー | Uma Musume: Pretty Derby (Anime), more)
4. Uncertainty Principle by Parcae991031 (ウマ娘 | Uma Musume - All Media Types, ウマ娘 プリティーダービー | Uma Musume: Pretty Derby (Anime), more)
5. Umamusume: Chasing That Horizon! by TombstoneTTromboners (ウマ娘 プリティーダービー | Uma Musume: Pretty Derby (Anime), ウマ娘 プリティーダービー | Uma Musume: Pretty Derby (Video Game), more)
6. Umamusume Overwrite Hack by IncrediblyUnsuspiciousBird (ウマ娘 プリティーダービー | Uma Musume: Pretty Derby (Video Game), ウマ娘 プリティーダービー | Uma Musume: Pretty Derby (Anime), more)
7. Tracen Portal: Powered by Gallop Learning Management Systems by Pridento (ウマ娘 | Uma Musume - All Media Types, ウマ娘 プリティーダービー | Uma Musume: Pretty Derby (Anime))
8. Tokai Teio Complains to Rudolf’s Friends Over Her Relationship With Sirius by SHAKEROCK (ウマ娘 | Uma Musume - All Media Types, ウマ娘 プリティーダービー | Uma Musume: Pretty Derby (Anime), more)
9. The Stud by Helix_Bami (ウマ娘 プリティーダービー | Uma Musume: Pretty Derby (Video Game), ウマ娘 プリティーダービー | Uma Musume: Pretty Derby (Anime), more)
10. To Play Goddess by SkylarWrites07 (ウマ娘 | Uma Musume - All Media Types)
11. Frontrunning Love by Agnes_Seey (ウマ娘 プリティーダービー | Uma Musume: Pretty Derby (Video Game), ウマ娘 プリティーダービー | Uma Musume: Pretty Derby (Anime), more)
12. Tachyon and the Great Horsefem Conspiracy! by CritianCaceorte (ウマ娘 | Uma Musume - All Media Types)
13. Here Comes Seabiscuit! by Eriendor (ウマ娘 | Uma Musume - All Media Types)
14. On a Pale Horse by WrandmWaffles (幼女戦記 | Youjo Senki | Saga of Tanya the Evil - Carlo Zen (Light Novels), ウマ娘 プリティーダービー | Uma Musume: Pretty Derby (Anime), more)
15. Uma Musume: Try to Catch Up by Extinct835 (ウマ娘 | Uma Musume - All Media Types, ウマ娘 プリティーダービー | Uma Musume: Pretty Derby (Video Game), more)
16. The Turf Looks Different From Here by Rose_of_May (ウマ娘 プリティーダービー | Uma Musume: Pretty Derby (Video Game), ウマ娘 プリティーダービー | Uma Musume: Pretty Derby (Anime), more)
17. Crimson Sun, Silver Moon by OperasParfait (ウマ娘 | Uma Musume - All Media Types, ウマ娘 プリティーダービー | Uma Musume: Pretty Derby (Video Game), more)
18. To Keep Her Close by toujoursamoureux (ウマ娘 プリティーダービー | Uma Musume: Pretty Derby (Video Game), ウマ娘 プリティーダービー | Uma Musume: Pretty Derby (Anime), more)
19. Umamusume: The Dream of a Hopeful Racing Trainer! by MutsukiYukou (ウマ娘 | Uma Musume - All Media Types, ウマ娘 プリティーダービー | Uma Musume: Pretty Derby (Anime), more)
20. Echoes of Possibilities by Yolo27th (ウマ娘 プリティーダービー | Uma Musume: Pretty Derby (Video Game), ウマ娘 プリティーダービー | Uma Musume: Pretty Derby (Anime), more)