Author's Note:
The prompt of the thread was:
>Fine, Anon.  You saved the kingdom and the Princesses and they promised you a reward.  Here I am.  I'm your reward.  Let's hurry up and get this over with.

I'm sorry.

http://archive.8ch.net/posts.html#!pone/228656
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>you find Rarity's attitude toward the whole deal perfectly understandable
>but rules are rules, and you're going to claim your prize even if the volunteer is having second thoughts
"Come in, then. Let's get started right away."
>she wordlessly makes her way into your home
>Rarity's eyes widen as you pull out an electric razor
"No point in putting it off, eh?"
>"I-I suppose so…"
"All right now, stop trembling so we can get this part done without hurting you."
>Rarity snorts at your remark, but holds herself steady as you take the razor to her luscious white coat
>an audible sob escaper her lips when you remove her mane and tail, but no protests otherwise
"Don't worry, Rarity. I'll take good care of this for you."
>she noticeably calms down at this, as though having resigned herself somewhat more to her fate
"Did you already do the enema yourself?"
>"Yes. With a… a little help from my friends…"
"That's good."
>you gesture toward a large pan on top of the counter
"Shall we?"
>sighing, Rarity hops up onto the pan and lies down on her stomach
"I hope you'll appreciate this."
>you procure a greenish bottle
"The highest quality extra virgin olive oil I could find. It cost me a pretty penny."
>Rarity looks over, seeminly interested before something strikes her mind
>"I guess I won't have to worry about acne."
>she laughs drily at her own joke, sighs, and puts her head down
"No, not anymore."
>you drizzle the expensive oil onto Rarity's back, and she shudders ever so slightly at the slippery liquid striking her bare skin
>you set the bottle down and massage the oil into Rarity's skin
>she moans gently
"Feel nice?"
>Rarity grunts in response
>your hands travel down to her rump, where you rub it in extra thoroughly
>Rarity groans
>"It's all right."
>you punctuate Rarity's statement with a slap to her pink rear
>she cries out and glares at you
"It's for tenderizing."
>"Just get it over with."
"Could you roll over?"
>Rarity sighs, but complies
>you drizzle the olive oil onto her exposed belly and caress it into her
>Rarity sighs again, more gently this time
>your hands make their oily journey across her forelegs
>and on to her neck
>you get as far as her cheeks before a naked hoof pushes your hands back down her chest
>so you make your way to her hind legs
>you start at the hoof end
>and you make your way down to her inner thighs
>you're extra gentle here
>you begin on the area around her vulnerable marehood
>Rarity whimpers
>"Stop."
>you pause, and your hands cease their greasy conquest of this mare's body
"All right. We're almost ready to begin."
>you retrieve a shaker
"Rosemary. Imported from Saddle Arabia and ground into the finest powder unicorn magic can manage."
>there is no response from your guest
>you apply a light coat of the spice to her undersides and legs and take a moment to gently pat it into the oil
"There. You'll be the finest meal ever eaten."
>Rarity's face jerks in your direction, and she frowns for a moment
>"I'd better be."
>you lower a spit onto her belly
"Would you wrap your legs around this please?"
>she pauses before quickly doing so
"Thank you."
>you tie her forelegs together with a thin rope, and you lash her hind legs to each other and to the spit
>Rarity shudders gently, small tears form in her eyes, and a quiet groan escapes her lips
>this you silence with a kiss
>Rarity freezes up, her face a muddled mess of indignation and appreciation
>you caress her cheek with an unstoppable, gentle hand
"Don't worry now, darling."
>you grunt, pick up the stick, and carry it outside into the twilit forest clearing in which your home stands
>you come to a stand set up over a fire pit and set her down into it
>the wood is already set up, all that remains is to take a match to it
>you do this, and the fire slowly begins to build
>"Wh-wh-what? Is that it then?"
"What?"
>"N-n-no… apple in my mouth? O-o-o-o-or carrot in my… a…butt?!?"
"No. You can have this with some dignity."
>you can now feel the heat of the flames on your skin, and you have no doubt that Rarity can too
>"Why do you have to do this?"
>you shrug, not really sure yourself at this point
"It's just what I am."
>you suppress further discussion on the topic with a question of your own
"You know, I asked for a cow. I have to know why you of all ponies volunteered to take some nameless cow's place."
>the heat is bad enough now that you have to take a step back
>Rarity glares at you
>"Because I couldn't bear the thought of some poor, innocent cow being killed and eaten by a monster like you!"
>she seems to attempt to spit at you, but her mouth must be too dry
"Generous 'til the end then, eh?"
>"hrmph"
>amazing
>despite the fact that she's dangling above a now-roaring fire, Rarity keeps her composure and doesn't utter another sound
>she holds her head up, too, in defiance of the flames below
>you considered tying that down too, but you decided not too, not wanting to degrade the proud pony cooking before you any more than necessary
>a big roast like Rarity takes hours to cook
>you stay with her the entire time, neither making nor hearing a single sound
>you watch her back turn red, and the redness spreads upwards across her entire body
>the red is followed by a brown color
>at last, Rarity's once-white back chars into a slight black
>she cries out, and her head begins to lose its fight with gravity
>"A-Anon…"
"Yes, Rarity?"
>"Y-you'll be there for Sweetie Belle, right?"
"Doesn't she have parents for that?"
>But… she won't have her big sister! P-please… I-I need to know… before I…"
"Of course, Rarity."
>"A-and my friends?!"
>her eyelashes disintigrate before you
"Of course, Rarity."
>"Th-th-thank… you… A-An…"
>she cries out again, and her whole body spasms violently
>this is it
>the spasms die down
>and her head slides down slowly
>gradually getting faster
>until her neck is fully extended and it comes to a stop, just low enough to be licked by the fire
>you waste no time in getting a bucket of water onto the fire and your dinner inside
>you procure knives and quickly separate the head and limbs from the torso
>you slice open the belly and remove the internal organs
>you would have done this before the roasting if you could have found another way to keep your dinner alive throughout it
>you set aside the head on its own platter and begin carving the rest
>the experience, it was so unique, you're glad now that it turned out this way, that you got to share in Rarity's last moments
>but you don't think you'll ever repeat it
>you place a hearty serving of Rarity on your plate and sit down to eat
>the quality of the meat is a testament to Rarity's healthy lifestyle
>truly the best you've ever had
>after completing three plates, you store the rest in your ice box
>you look down at Rarity's hair
>and over to Rarity's head

>well, she is your reward
>an idea hatches in your brain
>you should honor this mare who died serving the savior of Equestria
>you're going to use her head as a base
>and you're going to re-implant her real hair into it!
>and you'll hang her on your wall
>you know that she died from heart damage, and that her brain was left in tact
>Twilight Sparkle would be more than happy to try to bring her friend back to life!
>your reward will be with you again
>there, above your above your bed
>forever