Rainbow Dash doesn't wash much, so she smells bad. And she farts a lot. But, she's friends with Rarity, and she makes more friends this summer both in school and out. Most of which have a few quirks of their own, but none of which are overly bothered by her smell. Things become more interesting when Rainbow Dash and Rarity dare each other to switch places and see who can stay that way the longest.
Contains: Large amounts of Olfactophilia, farts, and omorashi/wetting. I tried to keep the third one T-rated but Chapter 11 features it more and it gets a little more descriptive from there. Do not read if any of these are a big turn-off to you.
Many chapters also contain soap/washing with butt-scrubbing, without nudity. If anyone is looking for these scenes specifically, I've identified each chapter with an author's note at the top.
Chapter 2 contains light scat (no messing, just her going on the toilet and there being no toilet paper) There is also mention of this in Chapter 9, and brief non-descriptive mention of messing in Chapters 19 and 24. Chapter 25 contains a messing scene but it's not too descriptive or significant to the plot.
Chapter 5 contains unusual buttplay, and Chapters 10, 12, and 25, possibly among others, contain more straightforward forms of it. Chapter 8 contains butt crushing and facesitting, which is less deadly to the victim than the farts.
Rated M for Chapter 11 onward's larger use of omorashi/wetting, the rest of the chapters before that should be closer to T-rated, and are relatively tame in comparison though still containing small amounts of that fetish which could also be seen as funny. If you don't like it you can ignore Chapter 11 onward.
Wedding chapter contains some wam, though combined with my fetishes.
I took advantage of the prequel story being Alt. Universe and changed things drastically from what we know in EqG. In this story, Rainbow Dash hasn't even met any of the other girls but Rarity yet, despite being at the end of high school. And some of them might be changed a bit too, and that's not getting into how inaccurate my portrayal of Lightning Dust is. But, that's what Alt. Universe tags are for.
One more note: Sunny Flare is also in this story, but there wasn't enough room in the character tags for her.
As usual, scenarios can get pretty stretchy. I'd like to think it has a bit more story like the prequel, but either way, don't take too seriously. Just another fetish fic. I do not think Rainbow Dash or any of the others are actually like that. Even my fetish headcanons have boundaries, and I hope this story doesn't negatively impact the way people think about the Equestria Girls. So, enjoy this story, but don't forget the much cleaner Equestria Girls of Earth 1! 
32 Chapters:
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A Shared Sense of Humor [Fimfiction.net] [Cache]
Apr 1st, 2018
720
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Using Her Smell as a Weapon [Fimfiction.net] [Cache]
Apr 1st, 2018
1,381
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Horse Racing [Fimfiction.net] [Cache]
Apr 1st, 2018
1,110
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Camping [Fimfiction.net] [Cache]
Apr 1st, 2018
2,005
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Pig Encounter [Fimfiction.net] [Cache]
Apr 1st, 2018
934
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The Dare [Fimfiction.net] [Cache]
Apr 1st, 2018
1,349
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Switching Places [Fimfiction.net] [Cache]
Apr 1st, 2018
3,792
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The Sirens [Fimfiction.net] [Cache]
Apr 1st, 2018
1,647
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An Even Dirtier Rival [Fimfiction.net] [Cache]
Apr 1st, 2018
3,134
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Enclosed Space [Fimfiction.net] [Cache]
Apr 1st, 2018
1,816
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A Wet Wallflower [Fimfiction.net] [Cache]
Apr 1st, 2018
3,173
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Rainbow's Dirty Rump [Fimfiction.net] [Cache]
Apr 1st, 2018
954
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A Typical Day at the Fair [Fimfiction.net] [Cache]
Apr 1st, 2018
2,535
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Slumber Party [Fimfiction.net] [Cache]
Apr 1st, 2018
1,666
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Wetness in Common with Sirens [Fimfiction.net] [Cache]
Apr 1st, 2018
3,127
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Smelly Fluttershy [Fimfiction.net] [Cache]
Apr 1st, 2018
1,891
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Lightning in an Enclosed Space [Fimfiction.net] [Cache]
Apr 1st, 2018
1,653
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A Smelly Siren [Fimfiction.net] [Cache]
Apr 1st, 2018
1,901
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Wet, Smelly, and Dazzling [Fimfiction.net] [Cache]
Apr 1st, 2018
2,413
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A Rival in Speed and Smell [Fimfiction.net] [Cache]
Apr 1st, 2018
2,101
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Rainbow vs. Sunset [Fimfiction.net] [Cache]
Apr 1st, 2018
2,055
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Enclosed Space with Indigo [Fimfiction.net] [Cache]
Apr 1st, 2018
1,735
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Love in an Enclosed Space [Fimfiction.net] [Cache]
Apr 1st, 2018
1,116
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Smelly Sunset [Fimfiction.net] [Cache]
Apr 1st, 2018
2,752
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Wet, Smelly, and Sunny [Fimfiction.net] [Cache]
Apr 1st, 2018
2,109
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The Smelly Girls' Day Out [Fimfiction.net] [Cache]
Apr 1st, 2018
3,512
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All but Indigo in an Enclosed Space [Fimfiction.net] [Cache]
Apr 1st, 2018
2,768
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Enclosed Space Contest [Fimfiction.net] [Cache]
Apr 1st, 2018
1,479
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Rainbow Dash the Smelly Pony [Fimfiction.net] [Cache]
Apr 1st, 2018
1,758
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The Wedding [Fimfiction.net] [Cache]
Apr 1st, 2018
1,679
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Epilogue: Fetish Fuel's End [Fimfiction.net] [Cache]
Apr 1st, 2018
570
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Alternate Epilogue: Butterfly Effect [Fimfiction.net] [Cache]
Apr 1st, 2018
948