Fluttershy was worried. She was very worried, as she always was for her animal friends. She was worried for a dog in her care. A shepherd boy, called Rex. Rex was sad and anxious and frustrated and even a little angry.

Somepony in Ponyville had left a dog in Fluttershy's care, while they were away from home. Unfortunately, the bitch in question had gone to heat while there.

Fluttershy was almost mad for how much she had teased Rex. The poor boy thought he'd found true love, but Fluttershy stood between them. Fluttershy tried to explain, she was somepony else's pet, that somepony might not have wanted their pet to have puppies, and once they came back from their vacation, Rex might not see her again. But Rex wouldn't listen.

Two weeks later, her owners came to take her back home. Rex was depressed and still frustrated. He started humping furniture, partly due to his frustration, partly to get back at Fluttershy.

She had a solution. But she didn't want to go that far. She loved her animals, but there were just some lines she shouldn’t cross. So she looked to every book she had on animals, she went to Twilight for more books, she even braved the Everfree Forest to ask Zecora for help, but to no avail.

So maybe, just maybe, she could cross that line, just one time…

***

“Rex?” she approached him.

The dog just turned away with a growl of disdain.

“Oh Rex,” she said, scratching behind his ear. “I'm sorry I hurt your feelings, but I did what was best, you know that.”

Rex just stared at the floor.

“You know she would have just gone away anyway, and then you'd be even sadder. But everything's okay, I'm still here. And I'm going to make it all better. You just have to trust me. Do you trust me?”

He looked at Fluttershy. She had such kind and beautiful eyes. She was kind, and Rex couldn't really hate her. He trusted her.

“I need you to lie down on your back, okay Rex?”

He hesitated only a second before falling on his back. He was familiar with the position from all the belly rubs he'd gotten from her.

Fluttershy gulped sharply as her eyes zeroed in on her target. His bulging sheath and surprisingly large balls. It wasn't the first time she'd seen it, of course she'd washed him before, she'd given him belly rubs. She'd seen it even more explicitly in the past weeks when Rex had humped her furniture.

And, to her shame, it wasn't the first time she'd thought of it.

She gently pushed the frog of her hoof to the bottom of the sheath. Rex looked up with surprise.

“It's okay,” Fluttershy whispered. “You're good boy, you deserve this.”

She pushed a little harder, and an inch of red flesh spilled out of the sheath. Fluttershy licked her lips unconsciously. She took a long sniff and a musky, earthy scent filled her lungs. She wondered if stallions smelled this naughty, and doubled her efforts, grinding her hoof softly against his groin.

Rex whimpered at the pleasurable feeling.

Fluttershy had never had a special somepony, and she had definitely never done something like this before. She was just too shy. The only reason she could do this now was because she was doing it for the sake of her animal friend, and the only fear she had was that she'd be too clumsy.

Rex didn't seem to think her first time to be clumsy. Half of his tool was soon exposed and Fluttershy had to do something more. Hooves were clumsy and tough, she needed something softer.

Gently, excitedly and shamefully, she nuzzled her face against it. It was warm, almost hot, and a little wet. She started by rubbing her face on it, before opening her mouth and carefully tasting it with the tip of her tongue.

It tasted… dirty. Not like garbage dirty, more like… sexy dirty. It felt so wrong. She smacked her lips, trying the salty taste, and she found it good.

She went in for another taste, and gave a long slow lick from the tip of the cock all the way to the sheath. Then she changed direction of her lick, moving around the cock, enticing more of it to come out and play.

She went even further down, nuzzling his furry balls gently, and even giving one of them a quick taste. She moved back to the sheath, licking her way back up the cock, now feeling over several veins that were not there before.

By the time she pulled her tongue over his urethra, and laid a loving kiss on the tip, the canine cock was already fully exposed.

She still wanted to think she was only helping her animal friend in need, but couldn't help but feel more than a little pleasure from the situation. Soon enough, the tip of the rocket was inside her muzzle. Rex whimpered, and a small amount of hot pre squirted into her mouth. She instinctively swallowed it and immediately regretted it. She wanted to savour the delicious taste more.

She pushed it deeper inside her, hoping to entice more of the tangy treat out of her canine lover. She wasn't too far gone to be careful though. She realized she didn't want to take the whole shaft in to her mouth. The base of the shaft had already started swelling, and she'd seen how large it could grow. She might not be able to take it out if she put it in.

Before she could take the base in her muzzle, she pulled back to the very tip, and gave it a loud, powerful slurp. Rex whimpered, and Fluttershy giggled into his meat as she tasted his sweet pre again. She went back down, until the shaft started to thicken exponentially, and pulled back to the tip, slurping on it, and going back down, finding herself a rhythm.

While bobbing her head up and down, her right hoof found it's way to his large balls, and started massaging them softly. Rex barked appreciatively at the feeling.

Soon enough, Fluttershy's muzzle started bumping against the swelling knot. He was close. She pushed on the tightening balls a little harder, and, with a wild howl, he blew.

Two spurts made their way inside her mouth and she almost choked, unable to swallow fast enough, and pulled out quickly. Three more spurts covered her face in the sticky substance.

Fluttershy's face was red as a tomato, under the white mask of cum. It burned her face, she didn't know how to feel about it. She panted, and a single long strand of cum dripped down from her tongue.

Rex recovered quickly recovered from his afterglow. He jumped up and licked Fluttershy's confused face happily, only to immediately cough at the taste of his own semen. Fluttershy giggled.

“Good boy”, she laughed. “But you have to understand Rex, that this was just one time, okay?”

Rex nuzzled Fluttershy's neck, signalling that he understood, before walking away for a nap.

As soon as he was out of sight, Fluttershy wiped the thick cum off her face and licked it off. She looked to the soaked floor between her back legs. Just one time…

Author's Note

So, fun fact: I wanted to write some cute safe for work Discolight for new years, pulled an all nighter and got way too existential, and now I can't seem to write that story without getting existential again. So, I gave in to the literal two people that have asked me for a sequel/prequel for Fluttershy's Fantasy, and this happened. I know it's short, I'm sorry, I'm gonna try make chapter 2 longer.