A Beast Unknown - Shadow Obstagoon TF

Story by WyraachUr on SoFurry

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Well, you knew this was coming XD A TF of Petra into a busty Shadow Obstagoon via :thronezweiicon:'s Medrem. Was tempted to have her be with Hadou, but I dunno - would that count as selfcest? XPPokémon (C) Pokémon/NintendoCharacters (C) Their ownersPosted using PostyBirb


"Been a while since I've heard from the guys..." Petra said to herself, sitting down on the sofa as she idly turned on the TV, eager to find something to watch to take her mind off of the hectic day she had beforehand. It was normally around this time of the evening where she'd chat with her pals Peter and Alex, but both of them had been missing for what must have been a couple of weeks by now.

It was strange that both had gone dark so close to one another. First it had been Peter, then Alex had vanished, their houses both cleaned out overnight. Rumors surfaced of people seeing large beasts nearby each time, but Pokémon didn't get that big. At least, not of the kind people had seen near Peter's house. A ding told her that an e-mail had arrived.

"Huh?" She heard the alert go off on her phone, fumbling through her pocket to pull it out to take a look at it. To her surprise, the email appeared to be sent by Peter. "Could this really be from him?" She asked before opening the message.

"Hey, sorry for taking so long to talk again. Been really busy moving into a new place with Alex. Got the address included in the message, so come on by and pay us a visit when you get the chance. I promise you'll like the place!"

She arched her eyebrows. Peter had never mentioned wanting to move, and neither had Alex, but the address was Peter's.

"Wonder where he even got the money for it?" She thought aloud - he didn't look like the type of guy who'd have money to afford to move houses in such a short timeframe. On the plus side, hearing from him brought her some relief, but she couldn't help but feel a little skeptical. "Eh, guess it couldn't hurt to check the place out!" She leapt back off the sofa, gathering her stuff before heading out once again.

She stopped not long after emerging out of her front door and locking it, a massive avian staring at her, almost expectantly. Corviknights were rare where they lived, and she had the biggest impression that it was specifically there for her.

"Coooooooooorrrrvviiii!"

"Woah..." She couldn't believe her eyes at the sight of such a rare Pokémon being within touching distance. "What brings you here?" She asked it. "You... wouldn't be one of Peter's Pokémon, would you?"

It nodded and turned to let her on the saddle it had on its back. She definitely knew he would've told her had he captured one, but Pokémon weren't known for lying. As she climbed on its back, it took off with surprising silence, shedding no further light on where her friends had gone, or why they hadn't come personally.

"I wonder if he's caught any other new Pokémon whilst he's been away... or if Alex has too, for that matter..." She pondered silently, holding on tight to the large avian creature, taking in the scenery as the Corviknight soared through the sky.

It took her out over the forest at the edge of town. She knew Peter took walks there often enough, so when it flew towards a large, gothic-looking manor house, Petra wasn't sure what to think. There was no way the two of them could've afforded a place like that. Assuming anyone knew about it - she hadn't known it was even there.

"There's no damn way..." She could only mutter in shock at the sight of the impressive looking structure. Peter had never seemed like the type of person who'd want to live in such an isolated area, even if he did have some company with him.

There were a few lights on, but she couldn't really see anyone. All the same, Petra couldn't shake the feeling that she was being watched from somewhere. The mansion had numerous statues of Pokémon around, and there was an odd smell in the air.

"Peter? You around?" She called out for her friend, stopping to take a look at one of the statues, depicting a fierce-looking Honchkrow. "Give me a sign if you can hear me!"

At this, the door nearby swung open and a light switched on above it. She didn't see or hear anything else, but the timing was far too coincidental. As she made her way towards it, she caught a glimpse of a Hydreigon's head in one of the windows, but only briefly.

"All this secrecy..."

She stepped into what appeared to be the main living room. A TV could be seen mounted to one of the walls, with varying forms of consoles, games, movies and magazines scattered around. At least this seemed more in line with the Peter she knew, with his love of gadgets.

She also spotted some of Alex's stuff in the next room over, so he was there too, but she'd seen neither hide nor hair of either. But then she heard footsteps approaching - though her attention was soon captured by a beastial roar from somewhere upstairs. So much so that she missed the figure looming above her until he was standing right next to her.

"Mmm... well how do you like that?" "Looks like our friend got lost." "Good thing you didn't go too far!"

A trio of voices chimed in one after the other, making her think that more than one person was next to her. That didn't turn out to be the case upon turning around, her eyes going wide at the sight of the anthropomorphic Hydreigon looming above her.

"If you're looking for Hadou, he's busy having fun with a friend." "He wanted to greet you, but he'll see you later, I'm sure." "But I've missed you as well!"

The muscular hydra's heads grinned as he led Petra into the next room over, his wings tucked against his back. It didn't take her long to figure out that somehow, some way, the dark dragon was in fact Alex. And he was completely naked and completely unconcerned by that fact.

"A...Alex?" She asked, following him. "How... how is this even possible? And if you're... well, this, then does that mean that Peter's also...?"

"I'm Medrem now. As for how? I'll get to that." "Peter's also a Shadow Pokémon as well, yes." "He's a Lucario. There's also Yuki, he's a Staraptor now."

The Hydreigon smiled at the thought of both of them. He'd spent quite a lot of time catching up with Savato once his transformation had concluded. The bird had quite the appetite for him, as it turned out. But they'd all concluded that Petra deserved to be a part of the house as well.

"You wanted to know how this happened?" "It's easy. One of us infuses you with some shadow energy." "And we mate. The change is mind-blowingly blissful as the corruption sets in."

"I... see..." She didn't quite know what to make of the situation, or even knew what to say. The dark aura emanating from Medrem, along with the glowing red eyes did make him look more nightmarish than a Hydreigon would look when in a foul mood.

"We asked you here because we missed you." "You, out of anyone else we know, deserve a chance to become something better." "Something less... human. But only if you want to."

Medrem's heads looked concerned, though Petra's sheer proximity to his aura was already starting to impact her views on both the idea of changing, and of her current state as a human. It was a small, subtle change.

"Well... you did ask me to come pay the two of you a visit... that's already more than most people I've known in the past who've just disappeared without any real reason..." She said, remembering back to previous experiences, frowning.

"We're sorry for not getting in touch sooner. Getting set up here without being noticed wasn't easy." "But we'll never ditch you. I may look different, but we're still friends." "Nothing will change that. In fact, you could even move in. Plenty of room." He hadn't asked too many questions as to her past experiences, but the thought of anyone hurting his friends caused Medrem's anger to spike, his aura flaring up just that much more. Humans could really be worse than animals sometimes. Petra deserved better.

"That's very true..." She nodded, her judgment clouded by Medrem's corruptive aura. "I bet none of you guys would take kindly to people like those!"

"Trust me, they wouldn't be around for long." "Humans can be scum, and I despise how weak-minded they can be." "But you've always been better than that, Petra. You deserve more."

All three heads watched her eagerly as they noticed the aura starting to sink in more and more. While the choice to succumb to the darkness his aura was starting to bring to the surface would be hers, being in Medrem's presence was definitely swaying her opinion. He was a big, beastial stud of a hydra. And was offering so much more.

"Mmm..." She took a long look at Medrem, eyeing him up. "Well I'm all for staying with you and the others, if you've got the room for me. Who knows, with a gal around here, there might even be a bit of variety to what could happen here~"

"Variety is always nice~" "So does that mean you want to see what beast lurks inside you~?" "I'd be more than happy to show you what my new body can do~"

As he spoke, his cocks started to stiffen, giving Petra a good look at the twin draconic spires that Medrem possessed, his dark aura corrupting his human friend all the more. He could see her eyes starting to faintly glow red, a sure sign that she was on the verge of giving into the shadowy corruption and taint her entire being, mind, body and soul, into a powerful Shadow Pokémon.

"I might be more than just a little bit willing..." She said in a flirty tone, whistling when she saw Medrem's dual dicks emerge, slick with pre. "Not to mention that I really do like what I'm seeing here - you really got an upgrade~"

"Hhhhyyyydddreeeii...oh yes, I've enjoyed the... upgrade I've gotten." "Having three heads lets me do all sorts of tricks~" "So, my lovely friend, do you want to try fitting one in your mouth, or do you want to mount this hydra~?"

Medrem chuckled as Petra expressed absolutely undisguised interest in his new body, the lust and sexual appetite that all Shadows had starting to manifest itself in her. He was already manipulating her aura. There was one Pokémon that would be perfect for her to become. It was only a matter of erasing her humanity.

"Both options are sorely tempting... we might even be able to do both if you're lucky!" She grinned wildly, casting off her top as she undressed, teasing the Shadow Hydreigon with her body, swaying her hips. "That is, if you don't mind going for a ride!"

"Not at all, my dear!" "Going for a ride sounds just like the perfect way to get rid of your humanity!" "I think you'll enjoy what's going to happen..."

All three heads watched her as she undressed, the striptease driving the hydra wild. She was embracing what she was becoming eagerly. All humans ultimately did, but it was the way they did that was always unique. Some gave into the rage, others schemed, others embraced their suppressed libidos.

"I'll hold you to that, sweetie~" She flirted with Medrem, running a hand along his scaly muscles, beckoning him closer to her. "I'm sure with all that you've got, you can get quite creative, right?"

"Well, you know what they say!" "If two heads are better than one..." "Surely three are better than two!"

He grinned and moved closer to her, happy that she was so freely accepting of everything. Even his new body hadn't seemed to shock her overmuch, and he was going to show her how freeing being a Shadow could be. Medrem laid down on the couch, easily large enough to fit them both, his spears sticking up.

"Have fun~" "It won't all fit at first, but it will." "My lovely beast to be!"

Petra giggled excitedly, climbing up onto Medrem's chest. Her rump was poised teasingly atop of his dicks. "Even if you can't get them all in to begin with, I'm sure the one that doesn't go in will still get some good attention, if you know what I mean!" She winked.

"I'm counting on it!" "Don't you worry, you'll become something fun..." "A fellow dark-type to keep me company~"

He purred as he watched her position herself to suck his other shaft off while she rode him, one of his heads snaking around to tease her breasts and to kiss her while the other two watched lustily, his nerves all on full alert.

"Mmmrghh... well... I can't wait to see what one suits me best..." She moaned from the attention, leaning into the kiss as she slowly slid herself down onto one of his dual dicks, her hands grasping the other one at the same time.

"Hyyydreeeeiiigghghh..." "Ggggoooonnnnnhhhh..." "Rrrrhhhggghhhh..."

All three heads roared or rumbled blissfully as the one began to suckle and lap at her breast, her form only able to fit a little bit of his cock for the moment, but all three smiled as they watched black and dark grey fur start to sprout on her body, her muscles starting to build themselves up.

"Mmmmpphhh... oooohhhh, that's gooooooooooood!" She grinned, eyeing up the fur that was creeping up over her form. She worked Medrem's free shaft up and down whilst she bucked against him, riding him for everything he had to offer.

"Hhhryyyyyy..." "Just... you... dreeeiiii..." "..wait...!"

Her body began to stretch taller as the fur spread further, bringing with it potent, beastial strength, her breasts growing larger and heavier in the process, bouncing as the hydra kept suckling at them greedily. She could feel a total contempt for humanity settling in, an urge to change further.

"Grrhh... Oooobbsssttaaa...." A growl left her throat, her free hand moving to feel her growing bosom, admiring the growth. She kept on riding him harder, looking into the beasts eyes as she goaded him on. "Are you sure you're....rrgghh... not holding back on me, dear?"

"If you want the full beast..." "Mrrhhhgghhh... all you had to do..." "WAS ASK!"

He howled as he began to thrust harder into her, his cock sliding deeper into both ends that he was fucking as a short tail grew out of her spine, her arms growing stronger as long, sharp claws sprouted from her fingers, replacing her nails in short order, the pair's mating noisy and rough.

"GRRARGHHHHH!!!" She hissed out in a mix of pain and pleasure, her grip on his cock growing tighter as she bucked against him, her legs wrapping around his sides. "Now....grrgghh... THAT'S more like it!" She cackled, still pumping his other spear as she leant closer into Medrem, wanting more attention from his heads.

One of his other heads craned itself in and latched onto her other nipple, the last one kissing her deeply as he was fully engaged by the changing woman, his cocks leaking a stream of potent draconic pre. Her legs bulked up as the fur covered them, heels warping as her feet stretched, growing claws and pads on them. She was almost as big as he was, and just as strong.

"Ooobbbsstttaaaaa.....yyeessss...." She purred in bliss, adoring the attention as she was tended to by the triple-headed beast, her tongue entwining around his as her breasts were tenderly milked. "Keep... keep it up, my dear friend..." She panted, eyes fluttering rapidly.

"Hhhhyydrreiiii... oh yesssss, not finishing..." "Gggooon... until you're done..." "Until the beast is fully out!"

His heads continued to work her breasts and kiss her deeply as the Obstagoon bounced on his rods, pre leaking from them both as he drank her milk. Her hair started to change into fur as it gained the same black and white coloration of the beast she was becoming, ears rounding over as her eyes glowed fiercely in the light of the room.

"Grraahahahh!!" Petra cackled wildly, mind fully lost to the corruption as she clenched hard against Medrim's shaft, her dagger-like claws moving swiftly up and down his second spear, working so fast that he was only a little bit worried if she'd end up ripping it off with how she was going. Her breasts bounced against Medrim's maws, goading the Hydreigon on further. "Come on, let's finish this with a bang!" She roared.

"Mrrghghghhh...and a bang it shall be..." "...once you fully become..." "The sexiest beast imaginable!"

All three heads smirked as they watched her face fully push out into a muzzle, her nose changing to fit her new species, the corruption all but fully set in, the final seal rapidly approaching as she could feel his spires quaking as he tensed up, all three heads roaring as one as he finally came, filling her up to the brim and spurting it all over from the other.

"Mrrghghghgghhghhghh....ghhhhrrr.....HHHHHHHHHHHHHHHHHHHYYYYYYYYYYYDRRRRRRRRRRREEEEEEEEEEEEEEEEEEIIIIIIIIIIIIIIIIIIIIGOOOOOOOOOOOOOONNNNN!"

"Hhrhr...rraghgh.... OOOBBBBBBBSSSSSSSTTTTTTTTTTAAAAAAAAAGGGGGGGGGGGOOOOOOOOOOOOONNNNNNNNNNNNNN!!!" The freshly transformed Pokémon threw her head back, howling to the moon and beyond as she climaxed alongside her partner, soaking his cock in her warm, slick juices.

He withdrew his heads from her breasts as he purred, the vibration shaking her body, a wicked smile coming over all three. His hands pulled her close, feeling her fur and muscles.

"How does it feel to be complete?" "All that energy, all that power." "And I hope the ride was well worth it~"

"Mmrrrhh..." She purred, huffing as she slowly came down from her high. "It feels... better than anything I could have ever imagined..." She shot him a devilish grin, eyes gleaming as she placed her arms around Medrem's back, pulling him into an embrace. "And believe me, it was~"

He hugged back, a surprisingly delicate and genuine embrace, given their intimidating looks and grins. Medrem helped her down off of his spires a few moments later as the pair heard more roars from elsewhere in the house.

"Hehehe, guess we won't be seeing Hadou and Savato for a while longer." "But there will be time, of that you can be sure." "Until then, shall I give you a tour, my lovely Obstagoon friend?"

"I'd like that very much." She smiled, grasping one of Medrem's hands. "Maybe we could start with the kitchen, all that riding has worked up quite an appetite!"

"Glad to be of service, and a bite to eat sounds like just the ticket~" "It's surprisingly easy to 'convince' humans to give you a supply of food, as it turns out." "Does pizza sound good?"

The three heads all laughed as the pair began their trek towards the manor's kitchen, Medrem pointing out other things of note along the way. A new name for the Shadow Obstagoon would come in time, but until then, they had some catching up to do. And Medrem was all but sure his fellow manor residents would enjoy meeting their new and improved friend.