Twilight Tests Oak [FUTA]

by ShadowDragon6

Rating: mature
Tags: Slice of Life, Comedy, Romance
Length: 3881

When carrying out her usual daily tests on Oak's Shadow Dragon body, Twilight decides her friends need to be there for a very special kind of test. After all, not EVERYTHING she reads about in musty old books can be true... right?

When carrying out her usual daily tests on Oak's Shadow Dragon body, Twilight decides her friends need to be there for a very special kind of test. After all, not EVERYTHING she reads about in musty old books can be true… right?

Warnings: "Herm", "cumflation" "Size difference", "Expansion", "Excessive Cum", "Penis", "Nonpony". Mentioned in passing as part of a bad dream Oak tells Twilight he had, we have "Watersports", "Dark", and "Guro".

Published 1970-01-01 00:00:00 UTC
Last updated 2015-11-09 02:20:02 UTC

And Then They All Had Lots Of Sex

"Are you ready for today's test?" Twilight asked happily. She was standing, Rainbow Dash, Fluttershy, and Pinkie Pie were standing next to her, and he was sitting on a sofa she'd got from the Sofas And Quills shop. They were in a special testing room of her castle, with only a few windows to throw exploding stuff out of in an emergency.

"I guess." Oak The Shadow Dragon said, a little sad. He liked getting to spend time with Twilight, but the tests hurt sometimes.

Twilight put on some glasses that made her look really cute. "These are enchanted to show me magic." She said. "Now... I found a book on mythological creatures called Banished Beasts In The Bedroom, and it said something I'd like to try out myself."

"Really?" Oak asked, surprised.

"That's right!" Twilight said, a little embarassed and nervous.

"So... do we sleep weird?" He asked.

Twilight and Pinkie laughed. "No, this is about something... else... in the bedroom." Twilight said, giving him bedroom eyes.

"Peeing?" Oak guessed.

"Huh?" Twilight asked.

"Applejack gave me a big pile of hay to pee on in my room in the barn, but I soak the whole pile every time. She's started making me pee in milk jugs instead. It makes really good fertilizer, just like my poop, but having to move between full and not-full jugs when peeing is a pain."

"That makes sense. As beings of negative energy, it makes sense that when your body gets rid of stuff, the poop would be full of goodness." Twilight said. "Anyway, I'm talking about..."

She whispered in his ear. "Coitus." She said, blushing.

"Is that something you eat?" Oak asked innocently.

"No, it means sex." She said, eyes flat-topped.

"Oh. Ponies do that?" Oak said, blushing.

"Everything in nature does." Twilight said happily.

"Um..." Oak started to get horny, now that they were talking about sex. His stallionhood started to get hard, but he kept it in his sheathe he and was glad he was a pony, because it meant he could do that. "Everything?"

"Everything. You would not believe what sex fiends Pinkie and Fluttershy are." Twilight laughed. "Her parties sure go out with a bang!"

Oak blushed, thinking of the beautiful Pinkie Pie kissing Rainbow Dash, and his dick got so hard it started to hurt. Twilight pretended to not notice, wanting to see it all. "Oh, and Fluttershy sure shows Angel Bunny who's in charge when she gets in heat."

"Heat?" Oak wondered.

"That's right, ponies go into heat every two weeks. We need sex, and we can only think straight again after a good bucking."

Oak blushed and looked away. "Oh. Is that why I've been having weird dreams lately?"

"Yes. What are your dreams about?" Twilight asked.

"I'd rather not say. They're kinda evil." Oak said.

"Tell me anyway, I promise I won't be mad." Twilight said.

"This ouuta be good." Rainbow Dash said to herself, expecting him to find sex with the lights on super kinky or something. The pony-ish thing got aroused from just MENTIONING sex, how experienced could he really be?

"Well, I... I'm using my dick, and bucking you, and Pinkie Pie and Rainbow Dash, and Rarity, and Applejack, and Fluttershy. And around us, every mare and stallion in town is chained up and bucked by shadow monsters, hurt and tortured with whips and claws and black lightning until they beg for my-my c-cock." Oak said sadly. "And it's bigger than this castle. And I'm peeing on ponies, too, but it's not done in a fun way, it's to mark my territory, like a dog or wolf would do. And I'm saying mean words, like bitch, and I'm bucking all of the mares, and I tell the shadow monsters to chop off the stallion's cocks and buck their own buttholes with their s-severed cocks. And instead of throwing up, I get even more turned on, grabbing Bon-Bon and cumming in her until cum pools out of every orfice and around her eyes, and then she explodes from the inside out... A-and I use the blood as lube to buck more mares and go even faster, even though my cock's gotten so big it's only fun for me."

Fluttershy took some steps back while Rainbow Dash blinked in surprise. Rainbow had forgotten he was a powerful world-ending monster with no memories and all the maturity of a toddler. Sometimes, that made the thought of him even MORE scary than a big evil laughing jackass with a fancy-sounding deep voice.

"Eeeeewwwwwwwww!" Pinkie shouted, disgusted.

"Girls?!" Twilight shouted as she pointed to Oak, and they saw how sad he was.

"You all think I'm a monster now." Oak said sadly, starting to cry. He looked down at his black-scaled hooves. "And I am one."

Twilight put a hoof on his shoulder, and he gasped in surprise. "Oak, it's okay. Fetishes and the desire to buck is perfectly normal in a pony your age. And so are strange fetishes, like... Everything you just said."

"But I'm older than the universe, like all Shadow Dragons." Oak said. "I'm not a little kid."

"I'm talking about your body, and how it's taken on the physiology of a young adult male stallion." Twilight said. "And your mind, and how without your memories, you sometimes seem like a... um... cute little foal."

"Oh." Oak said. He thought about that for a moment. "Am I a stupid foal?"

"Of course not! You're a very smart foal, and you pick things up very quickly. I'm impressed at your rate of learning when it comes to History, Maths, and Science. Even if your art still-"

"Looks like crap." Rainbow said. Pinkie whipped Rainbow's butt with her tail, making her yell.

"COULD USE SOME IMPROVEMENT." Twilight said, glaring at Rainbow. She looked at Oak, and smiled cutely. "Oak, you're perfectly fine. But sometimes, you say things like that, and it... surprises ponies. It reminds us that you're not just Applejack's unofficially-adopted younger brother, you're a powerful Shadow Dragon part of an ancient prophecy that could destroy all of existence if we let it, and even though you purged all the evil from your body with that farm trick, your instincts and desires are still there."

"I don't want existence to be destroyed! I like it here!" Oak said. "I keep all my stuff here, and my favourite ponies are here, too."

Twilight rubbed her face on his in a pony kiss. "Don't worry, we'll stop the others. You said so yourself, remember? As for the... interesting... dream... Sure, it might not... exactly be... our cup of tea." Twilight said carefully, not wanting to upset him while also finding it the worst thing she'd heard ever. It was right up there with the time she went into the adults-only section of the library to find books for smart older ponies, and ended up reading Two Mares One Cup. It was so awful, she had to have her memories erased of that moment.

"It's time to test. Show me your stallionhood, please." Twilight said.

"Huh?" Oak asked.

"I need to run some tests on it." Twilight explained.

"On my dick?" Oak asked.

"Yes." Twilight said.

"Dick tests." Oak said, laughing. Pinkie Pie laughed, too.

"Well, why WOOD-n't you want to do those?" Pinkie asked.

Oak laughed so much he fell on the floor.

"They're very HARD and LONG and aDICKtive, but if you can CUNTrol yourself, you'll have A GOOD TIME, especially when you FINISH! The CLIMAX is the best part!" Pinkie yelled.

Oak laughed even more, his erect sheathe hitting the floor a few times as his chest expanded and rose.

"Pinkie, he's needs to be aroused right now for the test!" Twilight said. "We can't test his dick if he's laughing too much to get it out all the way!"

"Okay, I'll stop. Hey, should I get my sexy outfit?" Pinkie asked.

"No, the books said we're all supposed to be naked for this." Twilight said.

"We don't usually wear clothes." Rainbow said.

"I know, but now there's a reason for it, besides because we can." Twilight said.

Oak did his best to stop laughing, and looked down at his dick. "I'm ready for the sex test!"

"This isn't a sex test, it's a thorough-" Twilight said.

"Tex! Or sexst!" Oak said happily.

"It's a thorough examination of your sexual organs and sexual prowess, along with an analysis of your sexual habits and behaviour!" Twilight said angrily.

"And you're testing this by screwing his meat?" Rainbow asked.

"YES!" Twilight yelled.

"Is this all some way to have sex without it feeling weird to you?" Rainbow asked.

"I have had sex before!" Twilight said angrily. "There was a penis, and everything! It was thirty inches, and he put it inside me! RIGHT IN MY MAREHOOD! TWICE! IN A ROW!"

"Uhuh. Sure." Rainbow said, not believing her.

Twilight turned her head up and groaned. Oak thought she was cute when she was mad. He wanted to make her mad more often. Maybe he'd get his cum in her mane or tail.

She used her magic to push him onto the sofa, and started stroking his chest and legs with her magic. "So Oak... how do you feel?"

"G-good." Oak said nervously.

"Are you erect yet?" Twilight asked like a hologram.

Oak looked down, seeing his penis in his big sheathe, twelve inches long and really thick, its tip peeking out just a little. "Does this count?" He asked.

She looked down. "No, it needs to be fully erect."

She turned around and waved her butt in his face, and showed him her huge pony vagina. It was so big, he could probably fit both his hooves in there, and he immediately knew he wanted to do just that. "How about now?" She asked.

"N-no." Oak said nervously, trying not to cum.

She rubbed her butt on his sheathe, tail grabbing it tightly and pulling the sheathe down. "Now?" She asked.

He moaned out, blushing, and his stallionhood sprung out of his sheathe hard enough to push her over, her head hitting the ground, butt in the air. "Ummm... Eeeyup." He said, embarassed. Rainbow Dash and Pinkie Pie laughed.

She turned around and her jaw dropped. "Wow! It's huge! It must be at least 40 inches, and as thick as my hoof!" Twilight said, surprised.

"Great size for a bro!" Rainbow Dash cheered.

"Is that good?" Oak asked cluelessly.

"Yes!" Twilight said happily.

"But it's too big for your mouth." Oak said sadly.

"I'm a pony." Twilight said, and then she opened her mouth so wide the bottom of her jaw went down and poked her neck, and her mouth opened wide enough for her to see all of her gums and teeth, lips going inside out.

"Ewwwwwwwww!" Oak said, looking away.

"What?" Twilight asked, closing her mouth. "I'm a pony, we have huge mouths. You have them too."

"I know, but it's still weird." Oak said.

"Whatever. Let me analyse your..." Twilight said, and then she looked down. She saw something that surprised her a lot, and now that she looked at him from this angle, she could see it. "You're unusually wet down here."

"Thanks, uh... So are you?" Oak said, assuming complimenting the other pony's dick or mare-thing was normal when he was about to buck. He should have read some porn books first, so he'd know what to say when having sex.

She stroked his marehood, which was located between his balls and butthole, making him moan as his penis pulsed and grew. "No, it is not normal for a stallion to have both a penis and a vagina." She said.

"Oh." Oak said sadly. "Could you keep touching it? That felt really nice."

"WHY do you have a penis and a vagina?" Twilight asked. "And why is your cock getting bigger?"

"Is it a Shadow Dragon thing?" Oak asked, blushing. It felt weird when she said cock with her voice.

"The book only mentioned your kind's incredible sexual appetite, perversion, penis size, and shape-altering ability. Along with some very kinky uses for the coloured fire you can make. The black flames is Dark Fire, imbued with the power of darkness, while the purple fire is individual and your fire, not the darkness's, so it's safe for you to use it." Twilight said. "The books didn't say anything about you having both parts, though! Do they both work okay?"

"I don't know. I've never used them before. Except  when peeing, then I get to pick which one I pee out of. I usually choose the stallionhood, it's easier to aim, and the pee running through it feels nicer. And I love having an excuse to let it out. Sometimes, I wish I could walk around with it out all day." Oak said.

"You can do that." Rainbow Dash said.

"Huh?" Oak asked.

"This town doesn't have any laws against nudity, so why would we care if a stallionhood was out or not?" Rainbow asked. "It might be a little distracting, but so's a sweet flank out on display."

"Wooooohoooooooooo!" Oak said happily. "This town's about to get a whole lot bonerier!"

Twilight rolled her eyes and Pinkie laughed. "Only Diamond Dogs call them boners on this planet."

"Ok." Oak said, deciding he'd never say boners again. Diamond Dogs were stupid and ugly. The Shadow Dragon in him would only buck one if he wanted to hurt it on purpose.

She looked down at his massive penis. "Time to analyze this magnificent specimen." She said smartly, and she stroked it while she moved her head towards his giant pony slit. His marehood was a little bigger than hers, too.

Oak moaned out, and some pre leaked out of his growing dick that started to tower over her, painting her whole hoof white.

"You're very pent-up." Twilight said, stroking his dick and making him lean back on the sofa. She put her horn on his chest, and licked his slit, making him yelp.

"Wait! Um... Will this hurt?" Oak asked.

"Don't worry, big boy." Twilight said, moving her horn towards his marehood. "I'll take it easy on you."

She shoved her horn into his marehood and he screamed, his dick slapping against his chest, and bouncing off and hitting her head hard enough to hurt. That thing was heavier than it looked!

She pushed in more, head stroking his outer lips as her magic stroked his dick. The smell of the pre coming from his cock was a similar smell to the fluids pouring from his marehood, the strength of a stallion mixing with the tenderness of a mare. It was like lilac blossoms, only better, because it also smelled like sex. Hot, steamy, sex, the kind that would go on in a massive orgy for weeks and weeks, and make Celestia cry with jealousy because she wouldn't be invited... at first.

Pinkie Pie and Rainbow Dash started to touch themselves, and Fluttershy blushed while she tried to hide her face in her mane and not smell his cum, which made their loins afire. The blue Pegasus and the pink mare put a hoof in each other's madehoods, Rainbow screaming a lot louder while Pinkie smiled and enjoyed it quietly, to Oak's surprise.

Oak felt a little sad about Applejack not being here. But then again, he was his adopted sister. Then again, he was a Shadow Dragon and Applejack was a pony, so it wasn't incest. He wished Applejack was here. Then again, he had a huge crush on Pinkie Pie and especially Rainbow Dash.

Rainbow leaped forwards and pomfed her wings, licking his stallionhood energetically while Pinkie stood right behind her and ate her slit out like there was some kind of clock counting down, her slurping long tongue flicking fluids everywhere, even onto a surprised Fluttershy that covered her face with her wings while blushing. "Eeeeep!" She said cutely. Oak's dick twitched and grew a little more.

Oak gave a loud yell as he came from his mare parts, an impressive waterfall of marecum squirting out far enough to hit the wall of Twilight's castle, and the floor, and the seat he was sitting in, which gained a patch that got wetter by the second. If she ever wanted to keep that couch without going into heat from its smell, it'd have to be burned.

Twilight got horny, something in her alicorn body pomfing her wings and making her hornier than she'd ever been before. Her horn glowed, and she used her magic to jack off his penis incredibly hard while pushing her horn into his slit and enjoying the marecum shower. "Hurry up, I need a sperm sample for analysis!" Twilight said excitedly.

"Ow! Not so hard, Twilight!" Oak yelled, because it was starting to hurt.

Fluttershy put a hoof on Twilight, making her stop, and then she showed her how it's done, taking the massive cock into her mouth and tenderly loving it. Oak's yells got higher and higher until he came, filling her mouth and stomach, bloating it a little. She wisely pulled off when she felt her stomach distend more, remembering his fantasy about exploding a mare using cum, her mouth coming off with a loud pop, his cock sending a massive waterfall of sticky white stallion cum into the air as Twilight blushed and Pinkie cheered and danced in the white rain while Rainbow dash's jaw dropped, realizing his one orgasm had just outperformed every stallion and every mare she'd ever been with combined, times two.

The waterfall splashed on the crystal castle's roof and soaked all of them, painting their bodies white as his cock continued to send out an almost funny amount of cum.

Oak yelled out and his yells got quieter as his orgasm faded, coming back down to Equestria as his upwards-pointing dick flopped back onto his chest. He smiled and stroked his own cock, licking its head and finding his own taste delicious. He could drink that all day, and seeing Pinkie Pie take huge mouthfuls of cum and swallow it while the others licked themselves like cats made him even hornier. Twilight momentarily threw a blob of cum into another room and made herself forget about it, to make sure she'd have some to analyse later.

Purple fire started to burn around him, and his sex drive took over, his eyes glowing purple. His own species's lust kicked in, and he jumped onto Twilight, pushing her to the ground as his growing cock slammed into her huge marehood that started to feel tight. He growled and grunted like a horny wild animal as he pounded her slit again and again, and Twilight happily smiled, the fire around his dick feeling nice and warm instead of hot and painfully burning.

He came, and he poured even more cum in her than before, purple streaks appearing in the white liquid thanks to his Shadow Dragon powers. Twilight opened herself up and spread her legs and stance as wide as she could, letting the gallons of cum fall out of her, but it was still fired with enough force to fill her womb and make it swell.

When he was done with her, he pushed her aside like a candy wrapper, and fucked the other three. The Shadow Dragon in him couldn't understand why they were all enjoying it so much, instinctively knowing that creatures were supposed to find it painful when fucked with something so big. Still, he enjoyed it too much to care, and something in his subconscious told him that despite being the Shadow Dragon of Love and fucking millions upon millions of things in his long, long lifespan, this was the best sex he'd ever had.

When it was over, and he'd actually bucked Pinkie seven times before she was finally spent, the ponies were lying in a pool of their own cum and his -mostly his- and Oak reclined back on the sofa that floated in the cum river, purple fires fading as he regained control over his body.

He immediately jumped to a happily-floating Twilight, cannonballing into the cum river and grabbing her, startling her. "Oh my gosh, I'm so sorry!" Oak said, scared. "I don't know what came over me!"

"I do. That was your Shadow Dragon lust." Twilight said, making a mental note to write about that later.

"Sorry for being so sudden." Oak said, starting to cry a little.

"It's okay, I liked it. And I'm impressed that you managed to hold yourself back and only fuck us. The stories say Shadow Dragons did some awful things to their mates, which is why I had Applejack hiding in the ceiling with rope, and Rarity ready to send a letter to Celestia if that didn't work."

"You'd tell Celestia?" Oak gasped.

A crazy Rarity immediately rushed through a window in the crystal castle and dived into the cum river, swallowing mouthfuls of his cum, unable to hold herself back any longer.

"Don't worry, Princess loves having a Shadow Dragon fighting for her, she wouldn't send you to the moon, even if her soldiers don't like you." Twilight said. "She'd restrain you if Applejack couldn't tie you up or restore your senses."

Oak looked up and saw Applejack on a crystal ledge specially made for her a hundred feet off the ground, sorta like the platforms in TV stations. She'd been masturbating a lot with her hooves, and she was still cumming. If the smell of himself wasn't so strong, he probably would have noticed her smell sooner.

"Applejack looks like she needs... ummmm..." Oak said, and then got nervous. Could he really say that out loud?

Rainbow Dash flew Applejack down for him, setting her down on the soaked sofa.

"Big sis?" Oak asked. "Can I fuck you?"

"It's buck, sugarcube, and yeah. Just make sure you DON'T call me Big sis when you do it, ok?" Applejack asked. "I let you call me that because you lived with us for a while, but-"

"Wooohooooo!" Oak said happily, swimming over to Applejack and fucking her again and again and again, glad Earth Ponies had naturally-better stamina.

When he was finished, his balls empty and his marehood closed, his massive cock shrinking and sliding back into his sheathe, he fell on top of Applejack, who smiled up at him.

"Everypony... I love you all." Oak said happily. "I love you all more than anything I've ever met in my whole life. You're all nice and kind and good to me, and I love you. And I love fucking you, too. Rainbow Dash said it's normal for ponies to get into harems-"

"Herds." Twilight said.

"Herds, so... Could you all be in my herd? Will you marry me?"

"I do." Twilight said.

"I do." Rainbow said happily, flying up and flying while taking mouthfuls of cum from the river under her.

"I do." Fluttershy said quietly.

"IDOIDOIDOIDO!" Pinkie yelled, waving a hoof around while swimming in cum.

"I do." Rarity yelled, breaking the surface for a moment to drink more.

"I do." Applejack said, kissing his cheek.

Oak smiled and closed his eyes... and Apple Oak The Shadow Dragon... was happy.