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31 Days of Derek Hale

Day 21: Centaur

Info │ 01 │ 02 │ 03 │ 04 │ 05 │ 06 │ 07 │ 08 │ 09 │ 10 │ 11 │ 12 │ 13 │ 14 │ 15 │ 16 │ 17 │ 18 │ 19 │ 20 │ 21

“Fuck!” Derek roared as he stormed into the yard, hands clenched into tight fists. 

The werewolf was irritated over having nearly lost control of his inner wolf, and nearly wolfing out in public. Derek and Stiles had been out on a simple dinner date, when stupid Jackson had to show up and be his usual douchey self. Normally, Derek was able to keep his lupine instincts in check; however, the second that stupid Jackson had placed his hand on a clearly annoyed Stiles’s shoulder, Derek had seen red. He’d shot out of his seat and had unleashed a fearsome snarl, even baring his massive werewolf fangs in the jerk’s direction.

It had managed to get Jackson to cut his crap, but the action had also accidentally caught the attention of other patrons in the restaurant, who’d only stared awkwardly/fearfully in Derek’s direction. The ceaseless staring had totally ruined the night, and Derek had dragged Stiles out of there early, much to his chagrin.

“Der!” Stiles called out after the stomping werewolf. “It’s fine, really!”

Derek was still seething. Sure he was irritated with Jackson, yet he was more so angry with himself and how his lack of self-control had ruined his date with Stiles. Thinking about it more only served to bring out an onslaught of more anger-inducing memories about how being a werewolf was a pain in Derek’s ass.

His jaw clenched, Derek just huffed in annoyance. “It’s not fine,” he pouted. “And this whole werewolf bullshit is something that’s just going to keep causing us trouble.”

Stiles frowned and placed a tender hand on his boyfriend’s shoulder.

“Sometimes,” Derek huffed, “I wish I wasn’t a werewolf.”

On cue, a streak of light flickered through the night sky as a shooting star bolted across.

Immediately, Derek flinched as he felt a warm travel throughout his body. The first thing he noticed was that his pants were starting to grow uncomfortably tight. 

“What the hell…?” Derek wondered aloud as he looked down at himself. HIs eyes went wide as saucers when he saw his altered bulge in the front of his pants. 

His normally proportional six inches had somehow elongated, creating what looked like Derek was stuffing a ripe grapefruit in his boxers. It was obscenely large, and between his thick thighs, Derek felt balls that had to be the size of lemons. Worse was that back of his pants felt as if they’s burst at any moment.

Looking over his broad shoulder, Derek gasped at the caricature of a butt that was attached to him. His perky cheeks had somehow managed to balloon out to a crazy size, pushing further out with each second.

In his panic, Derek ripped off his pants, his breath getting caught in his throat at what he saw.

Never being one lost for words, Stiles gasped out, “Holy crap, Der! You’ve got a horse cock!”

Derek’s cock had grown to at least fifteen inches, and it was nearly as thick of his beefy wrist. His balls had swollen up to resemble baseballs. The werewolf didn’t have time to focus on that as he felt his weight being yanked back due to the increasing size of his booty.

His legs stretched out longer, causing Derek to sprout up at least two more feet in height. All he could do was stare in disbelief at his changing body, his heart beat loudly in his muscled chest as he wondered what was happening to him. His throat went dry as he witnessed his toes fusing together, his nails hardening to form hooves. 

His butt grew so big that Derek stumble back and almost fell, but he was caught by something.

Stiles’s wordless gasp mirrored his own as he looked back and saw that he’d grown an extra set of legs to offset his elongated backside. Derek blushed at how he must’ve looked, having his regular-looking torso sitting atop a lower half that was stretched out with four legs needed to keep it upright.

Derek’s altered lower half began to itch as thick, black fur sprouted all over it, covering every inch. It was glossy and looked shiny underneath the moonlight. As a final touch, Derek winced when he felt his distended backside tingle as he sprouted a long tail that swished back and forth.

The warmth finally dissipated, and Derek also felt an odd calm inside of his head, like his inner wolf was finally silenced.

“What the fuck just happened?!” Derek panicked, taking an awkward step forward in his new body, his hooves clacking loudly on the ground as he struggled to get used to walking. As he moved, his huge cock dangled around freely, making his face crimson.

Stiles’s mouth was agape as he looked over his changed boyfriend. Derek’s long legs were thick with muscle, which flexed with animalistic power with every heavy step he took. “Der,” he gasped, “you’re a centaur!”

“A what?” Derek groaned, pinching his nose in irritation. “When I said that I didn’t want to be a werewolf anymore, that didn’t mean that I’d rather be a centaur instead! How the fuck am I supposed to hide this thing!?” He gestured at his horse ass and cock, which were humongous and definitely would prove to be difficult to keep from prying eyes.

Derek stopped and sniffed at the air, still maintaining a keen sense of smell. And a curious aroma was wafting off of Stiles in waves.

“R-really?” Derek asked incredulously.

Stiles bit down on his lower lip and shrugged. “I played a lot of fantasy RPGs, and always liked the centaur characters… like, a lot.”

Derek felt his shock slowly fade, and he couldn’t help but grin coyly at his boyfriend.”C’mere, I’ll give you a ride,” he chuckled.

Stiles eagerly took his hand and hopped up onto Derek’s new back, wrapping his arms around Derek’s human torso. 

Derek marveled at how weightless Stiles felt as he carried him, and he began to trot towards the house… his swaying horse cock getting harder and harder. He just hoped that Stiles knew some special stretching techniques.

Would be super hot to see Stiles turn Derek in to a sex doll that he constantly fucks.

Btw loved the 31 days of Derek tfs

(I know that this doesn't look exactly like a sex doll, but it's as close as I can get, haha!)

When Derek and Stiles had begun dating, Derek quickly learned that his boyfriend was insatiable. The human could go all night, seemingly for hours on end without a break. And of course Derek loved every single second of it, but the werewolf was a little embarrassed to admit that he struggled keeping up a little bit. The alpha was easily worn out and left panting after each session, only to feel exhausted when his boyfriend was primed and ready for another round immediately.

One night, after Derek finished fucking Stiles, the werewolf rolled over onto his back, his meaty, hairy pecs heaving as he tried to catch his breath. Basking in the post-orgasmic bliss that washed over him, he internally winced when he felt Stiles prop himself up on his elbow.

“Ready for another round, Daddy Wolf?” Stiles purred, his thin fingers tracing invisible circles on Derek’s pecs.

Despite how turned on he was, the werewolf was begrudgingly worn out. “Um,” he paused, his face burning red, “I actually think I need some more time to recoup.”

Stiles nodded understandingly, but there was still a small frown on his face. “Oh, okay,” he hummed, trying to ignore his throbbing member. He looked down in thought for a second before perking up. “Well, do you mind if I try something?”

“What?” Derek asked, curious and not wanting to disappoint his boyfriend.

Stiles’s smile returned to his face and he reached over to his nightstand and fished out his magic book that he’d been studying for the past few weeks. “It’s a spell that I found that guarantees to help one’s sex drive go on and on, nonstop!”

At first, Derek was skeptical; however, one look at his boyfriend’s eager face had him melting. “O-okay,” he hesitantly agreed.

Stiles was all smiles as he reached deeper into the nightstand drawer and pulled out a small glass vial that contained a colorless liquid. “Drink this,” he chirped, shoving the vial at the werewolf.

“You already had it ready…” Derek muttered, still downing the liquid that tasted a little bitter. He grimaced, but swallowed every single drop. “Now what?”

Stiles’s eyes widened as his grin stretched out his face. “It’s working!” he exclaimed with glee.

Derek cocked his eyebrow before becoming distracted by the stench that filtered into their bedroom. The stale smell of plastic wafted into the werewolf’s nostrils, and he opened his mouth to ask what was going on.

“Mmm-hmmm?!” Derek asked, shocked that he couldn’t get a word out. In fact, the more he tried to speak, the faster the alpha realized that he couldn’t move his mouth at all. He turned his face to look into the standing mirror, paling at what he saw. “Mmmpphh?!”

Derek’s mouth was stuck wide open, forming a perfect O. No matter how hard he strained his muscles, Derek couldn’t seem to close his mouth. That was the least of his concerns as soon as he noticed the shiny sheen that covered his skin.

Derek’s normally gruff appearance was becoming more sleek and smooth as his skin turned into plastic. He stared in shock as he watched his body go from being all buff and muscled to looking more like an overblown balloon in the shape of some muscleman. Derek could still see that he had his muscles, but when he moved his body, he winced internally as he heard the squeaking of plastic. Plus, his limbs felt light as air now, almost as if he’d blow away at the slightest gust of wind. Because he wasn’t wearing any clothes, Derek could see his cock stand at attention as it inflated up with air, growing in length as it become exaggeratedly large, more so for aesthetic. He shifted on his cheeks as he felt them get bigger too, and a stretching sensation formed as his hole deepened and widened slightly, looking like another entrance on a sex doll.

“Mmphh!?” Derek grunted in surprise as he stared at his new reflection in the mirror. Where a tough werewolf should’ve been was a sex doll that looked just like him. His mouth was comically round, ready to receive whatever cock would be thrusted into him. 

“You look great, Derek!” Stiles laughed, his already hard cock throbbing in front of him.

Despite his panic over being turned into a sex toy, Derek couldn’t ignore the surge of lust that took over him. He wanted to demand that he be turned back, but his desperate need for Stiles’s cock took over his senses, and all he could do was moan loudly with want.

“You want this?” Stiles teased, gesturing down at his hard cock.

“Mmmm!” Derek heatedly moaned. With his light limbs, he could barely move, rendering him a moaning mess as he craved cock.

Stiles easily lifted up his air-light boyfriend and positioned themselves so that he slid his cock into Derek’s agape mouth.

Derek moaned loudly at the surge of pleasure that washed over him. He’d never felt such intense pleasure like he did now, making him feel as if he was designed specifically for getting fucked, craving it more and more. His shiny, plastic muscles shone underneath the lights in the bedroom, and little squeaking noises echoed out every so often. 

When Stiles shuddered and came, Derek swooned at being filled. Normally, he was the top, but there was something with having Stiles’s cock inside of him that made him feel over the moon (probably because of whatever transformation he’d undergone). 

Derek was placed onto his back once Stiles was finished. “Damn, Derek,” Stiles gasped, trying to catch his breath. “You’re a natural.”

Derek lied on his back with his mouth still wide open, stuck as a sex doll. However, instead of feeling any frustration over his new form, he was irritated over the new unsettling emptiness he felt in his mouth.

“Mmmmm!” he moaned loudly, desperate to be filled again.

“Ready for another round already?” Stiles chuckled. “Damn, you can go on and on.”

Derek ignored the irony and just moaned like a needy slut as Stiles fucked his agape mouth again, only feeling satisfied with his boyfriend’s cock inside of him.