After finding Rainbow Dash acting really strange behind Thunderlane's house, Twilight does some investigating into "pet play" and sends in her best agent to discover the Element of Loyalty's true fate. Fluttershy, meanwhile, is desperately trying to hide the fact that this is about the most awesome thing she has ever had to do.
Contains: Adorable silliness, cock gag, tail-raising, bondage, collaring, leashing, implied gangbang, pet play, public humiliation, cum drinking, piercing, more collaring, self discovery, do people even read this? What is truth? What is this world? Hi there! What is to come? More pet play, marking, and more. Oh, and don't forget a little impregnation.
Some NSFW art could be found for this over on derpibooru, by putting 1349871 after the url. 
This was a commission piece, funded through Patreon.
See This Blog for licensing.
11 Chapters:
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The Best-Laid Plans of Pets and Mares [Fimfiction.net] [Cache]
Oct 2nd, 2021
2,560
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Advanced Infiltration [Fimfiction.net] [Cache]
Oct 2nd, 2021
2,513
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Discovering Oneself [Fimfiction.net] [Cache]
Oct 2nd, 2021
2,631
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Fighting Nature [Fimfiction.net] [Cache]
Oct 2nd, 2021
2,742
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Awakening a Hunger [Fimfiction.net] [Cache]
Oct 2nd, 2021
2,798
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On the Town [Fimfiction.net] [Cache]
Oct 2nd, 2021
2,556
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Bucked [Fimfiction.net] [Cache]
Oct 2nd, 2021
2,814
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Calming [Fimfiction.net] [Cache]
Oct 2nd, 2021
2,618
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Always Late [Fimfiction.net] [Cache]
Oct 2nd, 2021
2,849
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La Perfection [Fimfiction.net] [Cache]
Oct 2nd, 2021
3,809
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Home [Fimfiction.net] [Cache]
Oct 2nd, 2021
2,044