Rainbow gives Anon the shits

[I regret everything and nothing at the same time.]
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>Pinkie walks into your house, uninvited for the 100th time. These ponies have no understanding of the word privacy.
>She's worried about you, most ponies are.
>You've been shut inside for two days now and Pinkie is the only one rudely considerate to come check you out.
>"Anon," you hear her call out from downstairs.
"Pinkie?"
>She trots up and into the bathroom, despite the fact that she can hear the shower is on.
>When she takes one look at you and your cowering form sitting in the fetal position, her heart sinks.
>"Oh, I knew something was wrong. Tell Auntie Pinkie."
>You can't say a word of protest as the moment brings you into a hug, you melt and tell her all about your horrifying ordeal.
"I'm getting PTSD from just thinking about it already," you mutter to yourself.
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>You're walking down the street and up towards Fluttershy's house.
>Every week you go give her a helping hand with a few things, usually animal related.
>That's how you earn a living here, odd jobs.
>As you leave town, you hear someone crying, almost like a desperate whimper.
>You look around, for who it is. It takes a good while but eventually you stumble across Rainbow Dash.
>She looks up at you like a deer caught in headlights. Frozen, confused and terrified.
>Then she snaps out of it and tackles you.
>"Anon, I need your help!"
>You try lifting her off you but somehow, she's firmly planted. She won't budge.
"Calm down and tell me what do you need?"
>"I-I... I need you to..."
>Her face goes bright red as she backs away. She doesn't break eye contact as she walks backwards to make some distance.
"Dash, you're acting really weird. Just tell me what's wrong."
>"You promise not to tell anyone?"
"Tell anyone what?"
>"You have to promise."
"Not a word, not a soul."
>She hesitates for a few minutes before speaking up with nervous squeak.
>"I need you to... help me out... with..."
"Dash, fucking out with it!"
>"POOPING," she bellows.
>You don't process that at first. You stand there in a confused daze before nodding slowly.
>"I'll pay you."
"How much?"
>"50 bits."
>You catch yourself at first, you'd kill for 50 but this is a big ask.
>She can tell you're weighing the decision.
>"70."
"Deal."
>You shake her hoof and she spins around before getting into position.
>You take one look and regret everything. You feel like a cheep whore doing this for 70 bits.
"Should have pushed to 100," you softly mutter as you bring your hand up to her ass.
>"B-Be gentle Anon, it's my first time."
>Honestly, you have no idea what you're doing. You're hoping that poking around will do the trick.
>You gingerly prod her hole with the tip of your finger before slowly inserting it as Dash lets out a panicked whimper.
>You're about a finger's width away from nope-ing the fuck out of here but you need those bits. Plus, you've already begun.
>You push a little more until the finger is all the way inside, now you can feel it.
>The soft, lumpy substance that's got you in the shittiest situation you've ever been in.
>You bring up your other hand and slowly insert another finger. Dash begins to wriggle and writhe as your second finger goes deeper.
"Quit squirming."
>"I can't help it."
>You can't be too sure but you think you heard a muffled moan in between those words. You'd also rather not dwell on it.
>The sooner you finish and get out of here, the better.
>With the two fingers you pull on the edges of her ass, spreading it wider.
>The feeling of regret only gets worse as you open up her ass hole. A strong scent over takes all other smells and gets caught.
>You can't ignore this smell, it's horrifying. It's so strong and tickles the senses in a way that makes you feel like vomiting everything you've ever eaten in life right into this pony's blue chasm.
>"Oh god," Dash mutters as she covers her mouth.
>She's probably feeling about the same as you are but you aren't going to feel any sympathy for her. She's got you into this mess to begin with.
>As you spread her ass, you try working into another finger on each hand which works well. Her ass is spread pretty far open, probably more than enough to get to work but that's when you ask yourself.
>You have no idea what to do next.
>Do you shovel it out with your hands?
>Do you lift her up and shake it out of her?
>Do you just hold it open while she pushes?
>As if to answer your question, Rainbow looks back to speak and what comes next is the most horrifying and scaring part of the memory.
>She pushes, you know because you can feel her ass convulse and at the same time, the smell gets to her too much.
>Is a single moment, more terrifying than Cthulhu himself, she sprays shit and projectile vomit all over you.
>The smell of it is too putrid to explain, it was like feces had become sentient and took a shit then skunks came over and sprayed it before letting it fester in stomach acid.
>As you're being washed over in a tidal wave of the unimaginable, all you can think of is how you did this... You did this for 70 bits.
>You clamp your eyes and mouth shut as hard as you can and wait for it to be over.
>Even when it has washed over you, you stay perfectly. You don't speak, look, or move.
>"Here you go Anon," Dash says in a chirpy tune.
>You hear a sack of bits dropped before you before the sound of a pegasus pony taking off.
"I... regret... everything," you cry as the smell finally gets to you and you empty all the breakfast, lunch and tea you've ever eaten in the past few days onto the grass in front of you.