>Countryside walk with Twilight
>Things seem a little off
>Usually she would be telling you little titbits about the species of flora and fauna you passed, but instead she seems oddly distant; instead of talking to you she merely elicits pained groans, her face fixing into a grimace as she walks slowly alongside you. 
"Are... you okay?"
>She looks up at you, her face still filled with concern. 
>"To be honest, anon... I think I need..."
>She pauses there, clearly too embarrassed to continue further, but she knows she can be honest with you. 
>"I think I need to use the little filly's room."
>You can see her predicament; you're not even sure how far away you both are from a town - and especially a bathroom. 
>If somepony lived out here you could probably ask them to use their restroom, but alas ... nopony does.
>You can see Twilight's desperation is climbing; she sucks an agitated snort in through her nose and shuffles her hooves uneasily.
"I guess you could... do it out here."
>She shoots a glance in your direction, eyes widened.
>"What!? I- I couldn't do that!" 
>You catch on that what she needs to get rid of isn't just liquid.
"Sure you can. Animals do it out here all the time."
>Her blush intensifies.
>"I'm not an animal, Anon! ...and even if I tried, it..."
>Her words fail her again, overcome by another wave of shame and embarrassment. 
>There's a moment of silence before you sense what she's getting at.
"You mean... you're consti-"
>"Anon, please! What if somepony can hear you!?"
>You laugh at little Twi's cautious outcry.
"There's nopony this far out. Don't worry. Besides... if it's a little... stuck, maybe I can help you."
>"E-Excuse me..!?"
>The suggestion is maybe a little forward, but you don't like seeing her in discomfort. 
"You think I care? It's a natural bodily function, after all. This stays between us."
>You reach down to stroke her mane in an effort to prove your loyalty to her, but she doesn't reciprocate the warm gesture, possessed by another painful surge of abdominal cramps. Tears form in her eyes. It's too much.
>She relinquishes her pride with a mournful sigh. 
>"Fine. It's not like I have any other option right now."

>The two of you find a clearing a little way into the forest. It's about as far away from other ponies as you can be.
>Twilight is still filled with trepidation, but... she trusts you. She knows you only want to help her. 
>Feeling another painful cramp, she falls onto her side, hoisting up one of her hind legs and desperately forcing as hard as she can.
"Twilight! You're not gonna get it out forcing it like that."
>"S-Sorry."
>You can see she is beyond desperation at this point. She just wants it out of her system, and only you can help. 
>You lower yourself onto the ground, scooting up behind the princess and pulling her towards you.
>Twilight rests her body weight against you, your arms reaching around her frame. 
>You feel for her belly, and find it.
"Wow. What did you eat?"
>You circle your hand around its curvature. It's practically rock hard.
>"I don't know. I had Celestia and Luna over last night, and... well, Pinkie baked a few cakes for us."
"A few, huh?"
>You feel her abdomen tense up as she tries, fruitlessly, to void her bowels. 
"Just relax. I'll soothe it for you."
>She nods silently, expelling little wispy breaths as you continue massaging her stomach; kneading in just the right spots to try and encourage the blockage to abate. 
>Twilight's head falls back onto your shoulder. You keep your embrace around her tight.
>"Thanks, Anon. I think it's... mmh... moving a little down there."
>Catching the both of you by surprise, a short, airy fart releases out from between Twilight's legs.
>"I'm sorry."
"Don't be. That's a good sign, right?"
>You continue rubbing and probing her belly with equal measures of hardness and tenderness. It feels as if slowly it's getting smaller and less firm.
>"Anon! I think it's.."
>Your rubbing gets a little faster, guiding your hand downwards in the direction of its escape route. 
>The mare's panting and moaning becomes louder.
>"Yes! I think it's working!"
"Just push, Twilight!"
>Her hind legs wobble and begin to part, her tail swishing out of the way as she leans herself back into you fully.
>Her chest expands and retracts; you feel the muscles underneath the skin of her stomach harden and contract.
>She expels stuttered, ecstatic breaths and raises her right leg up in the air slightly.
>"Y-Yes!!"
>Her entire body begins to shudder uncontrollably. You peer down, and between her legs you see the wet glisten of something long, fat and brown snaking out.
>It retracts slightly; shy, but soon begins to crackle out again with a loud wet mucusy noise. 
>It seems to only get longer and longer, as a string of drool drops from Twilight's lips.
>Her shoulders tense and shiver against you; trembling in relief, pleasure, and pain as she reaches one of her hooves down to pull the right leg up towards her chest. 
>The turd starts to coil neatly on the dirty ground below; chestnut-brown and textured. 
>Her sphincter cuts it short; letting it fall with a weighty thud, but pretty soon another log squeezes out. A little faster.
>The earthy, sour stench of pony shit may be a little dizzying, but you can physically feel Twilight's utter, euphoric relief. 
>She can no longer form words, just squeals and shuddering gasps as she unloads another thick package of feces.
>She brings her leg even closer up towards her chest, stretching herself out as she finds her release. 
>You continue to hug her close, pushing down on that warm little tummy of hers to make sure she gets everything out. You can feel its contents are emptying. 
THUD
THUD
>The pile of dung grows larger with each loaf of excrement Twilight drops onto the floor. She really has a lot in there.
>With one final prolonged fart, she is empty.
>After a few more moments, Twilight's quivering subsides and she relaxes back into your arms.
>"Ahhhh. I... I feel a lot better, now."
>She turns her head up to you, lips pursed, and you lean down to kiss her back. 
>The overwhelming smell makes the situation a little less romantic, but there's something you love about the feeling of Twilight getting the relief she deserves.
"There. All gone."
>"Thanks, Anon. It's still a little... well... maybe it's best if we don't talk about this."
>You chuckle.
"It never happened."