Actions

Work Header

A Practical Lesson

Summary:

Apparently, the Sex Education at the Ark was so bad that, to this day, Shadow still has no idea what sex looks like. Sonic, as a good friend, offers to help change that.

Notes:

Ok this is just a very self-indulgent, horny fic I made while I was stalling to write my other ones
Anyway
It's just straight up 8k of porn, ur welcome!

tbh most of this fic is just Sonic pretending he had experience when the truth is both are virgin losers - says me, the virgin loser.
Also, as always, English is not my first language, and this is not betaed so. I tried to revise it, but some errors may slip
With all that said, good read!

10/12/2025: came back and did a quick revision on the text, sorry for everyone that put thorugh this mess of repetition and typos

(See the end of the work for more notes.)

Work Text:

In all of Sonic’s life, he couldn’t exactly explain all the events that ultimately led to this specific moment. Maybe it was the strange conversation he had with Shadow, where he said something about never having any kind of sex ed while in the ark, which prompted Sonic, almost as a joke, to offer him a “private lesson”, which, surprisingly, Shadow accepted.

Not that he would backtrack now, yet it was still embarrassing to slowly open his legs wider apart, planting his feet on the soft cushions of Shadow’s single bed, feeling those intense red eyes focusing directly in between Sonic’s legs.

Shadow’s muzzle was flushing darker, hinting that he was probably as embarrassed as Sonic was, which was laughable considering he wasn’t the one exposing himself right now.

“Do you want to touch it?” Sonic breathed, his ears flickering as he felt his face growing warmer. Shadow’s eyes shot up, diverting from Sonic’s crotch to look at his face. It was such an innocent look, considering what they were about to do. “I-I can show you how to open the seal first…”

Absently, despite the nervousness, Sonic still trails his hand down, bare since he had taken his glove a few minutes ago, slowly tracing around his protective pouch, pushing his fur apart to show the hint of a pinkish line of flesh, the seal keeping his sex hidden. However, he figured that it wouldn’t take so long before the seal was loose enough to open by the way his body already felt so heated under the attentive and curious gaze. 

Slowly, with such care that he almost looked like he was diffusing a bomb, Shadow swallowed down hard, his hand creeping towards Sonic’s thigh, simply holding them there, as if he was trying to gather courage to proceed.

He almost looked cute from how shy he was acting. Not that Sonic could blame the guy, after all, from what he had learned (And the core reason they were even doing this) it was the first time the dark hedgehog had any kind of contact around intimacy.

“What…” Shadow’s voice almost faltered, his eyes meeting Sonic, shaking with uncertainty. Almost as if he was scared of making the wrong move. “What do I do? I don’t… I don’t know how…” 

“Dude, relax.” Maybe if he wasn’t so self-conscious, Sonic could’ve teased Shadow for the fact he was shaking like a baby deer right now, but, really, he has no moral ground when Sonic himself was breathing faster, his heart beating harder inside his chest. “It’s alright, I promised I would show you…” 

Sonic tried to keep it cool, casual, but he couldn’t deny how much this situation was lighting up his nerves, making him feel his shoulders all tensed up with the heavy aura inside the room.

But he couldn’t really blame Shadow for feeling embarrassed. Of course not. If the scientists in the ARK barely even taught him human reproductive anatomy, he imagined that there was an even greater lack of knowledge in Mobian anatomy.

“You know when your… Genitals come out if you feel really, really aroused?” Sonic tries to explain. Even if Shadow never saw a genital other than his own, Sonic imagined that at least once, his rival had been aroused enough for his dick to come out, right?

At that, Shadow hesitated, thinning his lips, before nodding curtly, his cheeks growing even redder than before. He looks so embarrassed, poor thing. Sonic thought in the back of his mind. He almost wanted to tease Shadow a little bit, just to see how he would react. But he was already so on the edge that Sonic feared that if he pushed him too hard, then Shadow would simply flee away.

“You can, like, coax it to open, if you apply pressure at the right point…” He moves his hand, slowly, so he wouldn’t startle him, guiding Shadow’s hand to feel against his seal. Just the brief warm contact made Sonic’s breath hitch. Shadow was frozen in place, his eyes wild, his breathing stopping altogether. 

Sonic almost backtracked, just to give Shadow more time to prepare himself, but soon the darker hedgehog was taking a deep breath, determined, his ears flickering forward with concentration, finally moving his hand, just slightly, his thumb gently caressing the small slit of his seal.“M-Move your thumb a little higher,” Sonic instructed, after all, unlike Shadow, he was experienced enough with his own body to know the right places to apply pressure when his seal was still closed like that. “K-Keep pressing down and rubbing…”

Sure, probably Shadow wouldn’t find the exact spot so easily as Sonic, especially since he was going blind without the feel factor, but to be quite frank, he was already getting so worked up and aroused just from the intense scrutiny of Shadow watching his body, that he figured out it wouldn’t take much time until his folds were fluttering open under Shadow’s careful touch. 

The touch was mostly exploratory, pushing aside the fur closer to the seal, feeling around it, and Sonic let him. Sure, he wasn’t expecting Shadow to find that specific spot Sonic knew he could use to feel his clit, though the seal, but the curious brushes were a nice and warm welcome. After all, this was more for Shadow’s learning than Sonic’s own pleasure. Even if the almost innocent way Shadow was looking at him did make Sonic shiver with goosebumps trailing through his spine.

“It… Seems to be getting looser…” Shadow murmurs absently. Once again, Sonic felt that, if Shadow wasn’t so tense already, maybe he would’ve teased about how hard he is trying to keep a straight face. But Sonic can’t even concentrate that much on that when he feels Shadow now using both hands, with his thumbs setting on the sides of his entrance, tugging his flesh apart, making Sonic flush even redder when not only he sees it, but he can feel his seal stretching even wider than before.

It isn’t a surprise when the next tug, even as gentle as Shadow is being, it gives away, fluttering open and parting to reveal the wet dip of flesh that once was hidden. This time Sonic actually leans back, putting a hand to cover his face, not able to bear looking when he feels his whole body heating up with shame and embarrassment.  

His ears make a small movement, hearing Shadow’s soft little gasp, and Sonic can’t tell if he is amazed or horrified with the sight. 

“Is it really the first time you've seen it?” Sonic breathes, without looking, but he still can feel Shadow watching him. He hadn’t really moved, his thumbs still hesitantly frozen in place against Sonic’s flesh, puffier now that the seal had parted, practically making the role of labia majora.

“Yes.” Shadow confirms, and Sonic can hear him gulping. Curiosity gets greater than his shame enough that Sonic lifts his arms and leans his head forward enough to look at Shadow, to see how his eyes were transfixed over Sonic’s sex, watching it like it was a forbidden fruit, with something akin to want. 

Sonic liked it. He liked feeling wanted, feeling desired. From the way Shadow was holding his labia apart, he could probably easily see how easily Sonic could get wet once his parts were exposed like that, and, strangely, the small humiliation of exposing himself like this somewhat only added to the thrill. 

“L-Like, n-not even in science books or shit?” Sonic breathed, wincing a little. He figured out that sex ed on the ARK was probably not one of the best, but when Shadow shyly hesitated, thinning his lips, before finally giving a curt nod, Sonic realized that maybe it was even worse than he imagined.

“Well then, w-what do you think?” Sonic wanted to shift himself; Shadow’s scrutiny and the way he was holding him were making him impatient, wanting to be touched some more, but he just bit his lip, trying to hold back some of that antsy energy.

“It’s…” Shadow hesitated once again, narrowing his eyes, and Sonic almost squirmed when Shadow’s eyes looked very carefully through the whole extension of his vulva. “... Odd.”

“Wow, you really know how to make a guy feel flattered, don’t you?” Sonic couldn’t hold back a snarky retor. Shadow gave him a deadpan look.

“It’s not an insult, you moron.” Shadow hissed, even if now, for sure, he did insult Sonic on purpose. He had taken no offense, of course, but was still endearing watching Shadow cursing at him while he was still shaking and so red in the face. “It’s just… Different.”

“Hmm, yeah, right,” Sonic tried to smile, feeling a small burst of confidence enough that, despite the nervous anxiety, he gathered enough courage to open his legs further apart. “You can touch it, you know? That’s kinda, the whole purpose we are doing this.” And to be quite frank, Sonic was feeling like he was going to explode if Shadow kept just staring at him forever.

Shadow tensed up at that. Sonic could see the way one stubborn quill puffed up away from the neatly arranged shape Shadow had over his quills. This is probably a lot for him, isn’t it? Sonic thought with a small sigh.

Sonic always thought himself to be quite the virgin, to be very busy saving the day (or fingering himself while biting down against his pillow) to ever pursue another partner in bed or to trust anyone enough to let himself be touched like this (well, at least until now). Yet, apparently, Shadow was leagues ahead (or behind? He couldn’t pinpoint exactly where to put it) in the virgin category. Ten minutes ago, the poor thing didn’t even know what a pussy looked like.

No wonder he was so nervous about touching it.

“I could also just, dunno, touch myself while you watch or something.” Sonic offered. While he figured out it probably would make him come faster, even if he wasn’t very keen on the idea of not feeling Shadow’s fingers in him. But Sonic also didn't want to put much pressure on his rival, because whatever novelty or nervousness Sonic was feeling, he figured it was probably tenfold for someone even less experienced like Shadow.

“No,” Shadow said back, quickly. A little too quickly, enough that they both were feeling their faces burning with embarrassment. “I… I want to… Feel it…” Shadow breathed, his thumbs moving ever so slightly, caressing Sonic’s fur very gently before Shadow finally lifted his head to meet Sonic’s eyes. “Is it… Alright by you?”

“Yes- o-of course!” Sonic almost stumbled over his words, nodding frantically with eager excitement. If his tail wasn’t trapped between the mattress and Sonic’s back, it would probably be wagging wildly.

Even more when Shadow was shifting himself, leaning down so instead of just sitting in between Sonic’s legs, he was lying flat with his belly against the bed, his face closer to Sonic’s dripping sex to get a better view. Sonic felt his poor heart doing leaps inside his chest. Shadow’s touch is slow, curious, explorative. At first, he just trails his fingers around the inner folds, feeling around the thin layers of flesh. There is a smallm embarrassing noise on the back of Sonic’s throat, his body shivering with the warm pool of arousal with the touch.

Even though his body was aching for more, the slow trail of Shadow’s index finger trailing on the edges of his flesh felt nice, steady, a warm and soft caress. Eventually, he moved to just trailing with the tip of his pawpad to feel Sonic’s folds in between his thumb and finger, gently massaging and pulling the flesh apart.

There was also the fact that Shadow looked cute like this. How his brows were furrowed with concentration, as if he was trying to disarm a bomb rather than simply touching a vulva. Sonic found it pretty endearing, Shadow almost looked like a lost puppy. Even more with how, despite that deep and confused frown frown, Shadow had that glint full of wonder and curiosity in his eyes.

“What is this?” Shadow asked eventually, pressing his fingers tighter around Sonic’s flesh enough for it to sting, earninga raspy hiss out from the blue hedgehog.

“Don’t pinch it," Sonic breathed, despite the jolt of arousal that jolted through his body with the sharp pain. "It’s sensitive!” Sonic explained, his ears flickering, and despite his warning, Shadow atil kept a small pinch in his flesh just for a little more before finally relenting, caressing Sonic’s folds with his thumb to ease out the soreness. 

Sure, Shadow may know very little about pain and pleasure in sex, and he was probably curious or he just wanted to provoke a reaction out of Sonic, it didn’t change the fact he looked like a sadistic little bastard when he pinched Sonic’s flesh like that.

This may as well just be Shadow using the chance to hurt Sonic in the same way he did in the middle of their fights, not like he even understood enough about sadomasochism. Well, that’s a thought for later, because as it is now, Shadow was staring at him, demanding an answer.

“It’s uh- Labia minora…” Sonic frowned, trying to remember the proper name. “It’s for protection, I guess…”

“You guess?” Shadow lifted a brow, eyeing him with an almost chastising look. Sonic could swear he felt Shadow’s fingers tightening around his labia once again, almost punishing for giving him a half-baked answer. Yep. Sadistic little bastard indeed.

“I-I’m not an expert, alright?” Sonic blushes, a stubborn pout making its way into his mouth. “And you’re in no place to judge me, at least I know what a penis looks like!” He grunted.

“You do?” Shadow blinked, a flash of surprise quickly coloring his widening eyes. For a moment Sonic almost wanted to explain that, well, he just looked at it through porn, but hell, it did feel good being around someone as inexperienced and unaware as Shadow. It did great things for Sonic’s ego, making him feel like he was the smart and experienced one here.


Yep!” Sonic puffed his chest, deciding to let the details of where he saw it stay hidden.  Shadow’s ears flattened, a persistent pout making itself known on his lips, before he was staring back towards Sonic’s sex once again. Is that jealousy?  Sonic thought, almost a little too smug. That is cute. 

Sonic could feel Shadow’s stare, and his pawpads gently caressing the edges of his vulva, almost feeling like a soft massage, which wasn’t entirely bad, but Sonic almost wanted him to stop being so nervous and keep touching somewhere else, preferably on the little sensitive nub atop his sex.

Sonic’s face was growing even warmer when Shadow decided to part Sonic’s folds, holding with his thumb, just carefully watching, looking at the way Sonic’s entrance twitched and dripped under the weight of Shadow’s attention. Sonic had to fist the sheets under him and bite his lip, feeling heat pooling in his lower belly when he felt the tiniest brush of Shadow's breath hitting against his sensitive area.

“Your scent is really strong,” Shadow noted, again with that deep and concentrated frown, like he was truly making an analysis of Sonic’s body being his object of study. Usually, it would take more than just one finger to make him moan, but he was already feeling so worked up that when Shadow slowly slid his thumb, feeling the rim of his entrance, Sonic made a noise almost akin to a whimper. “There is a lot of liquid coming out…”

“Ah- It’s to prepare it for penetration…” Sonic explained, and oh, he did feel a jolt of arousal by the way Shadow gave a hard inbreath, his pupils dilated, followed by an awkward and so hot press of his hips against the mattress, undoubtedly seeking friction. Once again, it felt good for Sonic knowing he was desired, that Shadow was also wanting Sonic as much as Sonic wanted him.

“So…” Shadow’s voice was a little weaker and raspy, like he was trying to put much effort into organizing his thoughts. “This is where the phallus should go, for breeding…”

“Not just for breeding, but yeah…” Sonic swallowed dryly. Back on his mind, he wondered what was going on in Shadow’s mind about this encounter; Did Shadow truly think Sonic was only letting him touch for purely educational purposes? Does he know people have sex because it just feels good? Or did he agree with this with the full intention of breeding him? As much as the latter option was horrifying, Sonic couldn’t deny how hot that sounded, at least in theory.

“Most of the time people do it cuz it feels good, you know?” Sonic explained, just for good measure, receiving an acknowledgment hum and a shy nod from his rival. Sonic was partially glad Shadow was more curious about exploring than understanding why people even had sex, but with the way he had been discreetly pressing his hips down against the bed, Sonic could tell that it probably didn’t take so long for Shadow to figure it out too, he was a smart guy, after all.

Soft pawpads rubbed along Sonic’s entrance, gathering a bunch of slick into the fur of Shadow’s hands, and surprisingly, he didn’t seem bothered by it. He even seemed to be interested in pressing along the edges of the hole, trying to stretch it to give a better look inside, to see Sonic’s wet walls fluttering with arousal.

Sonic had to actively bite his lip to muffle down his need to ask for Shadow to just push his fingers inside. Instead, he threw his head back. Be patient, let him feel around. Sonic chastised himself with a small grunt.

“So, if this is your vaginal canal…” Shadow murmured, just going back to gently trace around the edges with his fingers for a moment, which was frustrating after teasing Sonic’s hole for so long, but fine, he could live with it. “Then what is this hole for?”

Sonic’s whole body went stiff, because in the next moment, as soon as Shadow said those words, Sonic didn’t even had time to prepare himself before Shadow was pressing with his index finger against Sonic’s piss hole, and the most baffling part, Sonic realized, was that, unlike the hole he was actively meant to penetrate, he was trying to push. 

And while the hole was too small and too tight to have any kind of real intrusion, Sonic had been slick enough so the tip of Shadow’s finger was almost breaching it just briefly enough that had Sonic whimpering and sucking a breath. Despite how Sonic was squirming, his legs instinctively trying to shut, Shadow kept holding, eyes narrowed with a genuine curiosity and almost confusion, waiting until he heard a proper explanation.

“W-Whoah!” Sonic gasped, feeling a flash of hot embarrassment shot through his spine, his body tensing up with the attempt of intrusion against somewhere that was definitely not meant to me pushed inside. “A-ahn! I-It’s not… It’s not meant f-for p-penetration!” Sonic tried to explain weakly.

Once again, this sadistic little bastard took his time, humming, still curiously massaging his finger against it and dragging a pitiful sound that was pathetically close to a whine out of Sonic before finally letting up. Sonic blinked, his breathing a little harsher, but he could feel how hot his cheeks felt after that intrusive touch, his legs slightly shaking from that simple pressure, and, damn, alright, he couldn’t lie, he was slightly wetter. But maybe that was something for future Sonic to explore a possible new kink.

“What is it for, then?” Shadow frowned, and despite stopping, trying to push his finger inside, Sonic still shivered at the feeling of his thumb rubbing around it, massaging with his pawpads around the tiny hole.

“It 's the- uh… U-Urethra, for pee.” Sonic only had half a mind to explain between his harsh breaths, slowly reopening his legs further apart, remembering to give Shadow more free access to look. “Different from a penis, it is in a separate canal…”

“Looks sensitive.” Shadow lifted a brow, tilting his head to the aide, and Sonic genuinely couldn’t tell if Shadow was just curious or actively mocking him. Sonic almost wanted to kick him as much as he wanted to grab Shadow's handsome face and rub his cunt all over his muzzle

“It is.” Sonic hissed, rolling his eyes in an annoyed huff. He didn’t kick Shadow, and neither did he coat Shadow’s mouth with his juices, instead, Sonic just huffed, embarrassed. “It’s too thin to put something inside… But, I guess, like, the clitoris has an internal part you can feel through it.” Sonic keeps explaining. Just to be fair, he couldn’t lie that the pressure, even if extremely tense and out of the sudden, somewhat felt kinda good. Maybe he could try looking for some sounding stuff on the internet. He notes mentally.

But soon Shadow was narrowing his eyes again, giving Sonic a look that may as well belong to a lost and confused puppy from how innocent and cute Shadow looked. Damn, Sonic probably would be dead if he ever told Shadow he looked so adorable when he stared at him so confused.

“What is a clitoris?” Oh, Sonic felt himself grinning like a cartoon villain when Shadow asked this. Oh yes, I’ve been waiting for this! He cheered silently inside his own head, holding on hto is own knees to push his legs further apart, shifting his hips to push them a little more upward.

“Right on top, do you see something you haven’t explored yet?” He felt like a huge pervert saying this, especially when Shadow’s response was an almost innocent flick of an ear and a curious expression on his face, narrowing his eyes in concentration, following the trail towards the swollen little button atop Sonic’s sex.

“This?” And oh, thank Gaia, that Shadow liked to explore with his hands, because it didn’t take so long before soft pawpads were pressing against Sonic’s nub, gently massaging.

“A-Ahn!” It was so embarrassing to moan so easily like that. Generally, when he was doing it by himself, it would take a few more rubs before Sonic was starting to feel vocal, but he was so pent up with small strokes and teases that just a firmer rub on his clitoris had him losing control of his voice.

However, louder noise coming out from Sonic seemed to startle Shadow, and, instead of that almost sadistic curiosity in keeping pushing to see Sonic’s reaction, he hesitated.

“Am I pushing too far?” Shadow asked, just to be sure. Maybe, just maybe, Sonic could’ve thought that it would be so cute that, even with all that teasing, Shadow was still worried about genuinely hurting him. However, Sonic was so pent up and frustrated that he almost whined when Shadow retreated.

“No no no no!” Sonic said, and for a moment, he almost interrupted Shadow and reached to bring his hand back, but he held himself, just tightening his fists on his knees. “On the contrary- t-the clitoris is like- a bunch of nerves that feels really good, alright?” Sonic tried to explain, biting his lips as he couldn’t hold back a few twitches of his hips, trying to chase that touch.

Shadow hummed, his eyes coming back, laser focused on Sonic’s clit, and soon after, his fingers were back, thumbing it, massaging it, earning another soft moan from the blue hedgehog.Sonic breathed, watching Shadow through half-lidded eyes, noticing how he blushed and thinned his lips with Sonic’s next moan, how he kept rocking his hips occasionally against the mattress.

“Does it feel good?” Shadow’s voice was strangled as he continued his work over Sonic’s clit, rolling it around his thumb with one hand while with the other he stroked and explored along the hood, increasing, even if accidentally, Sonic’s sensitivity.

“Yes,” Sonic gasps, nodding his head. It felt amazing. Sure, Shadow wasn’t so efficient on what he was doing, and his fingers kinda slipped away a few times, but oh, the knowledge that it was Shadow bringing him pleasure made Sonic’s insides melt with heat. “M-Move a little faster-” He instructed, which Shadow obediently complied.

Sonic threw his head back when Shadow moved his finger at a faster pace against Sonic’s nub, circling and dragging it back and forth in his thumb, being helped with Sonic’s natural slick to make the movement smoother, sending shocks of pleasure through Sonic’s body with each movement.

Sonic had to keep his hands on his knees to stop himself from accidentally closing his legs with pleasure, yet that couldn’t stop him from moving his hips, trying to buck against Shadow’s touch.

But suddenly, he felt Shadow hesitating, getting a small, frustrated noise out of Sonic. Well, while the focus of this whole thing was more to let Shadow take a look, Sonic still wanted to get off. But thankfully, before he could even ask why Shadow stopped, the dark hedgehog instead trailed one hand lower, teasing a finger against Sonic’s entrance.

“Can I… Touch inside of you now?” Shadow whispered, a bashful look on his face. For once, Sonic was glad he made the choice to sit atop his own tail, trapping it to keep Shadow from seeing how excited he was.

“Of course. Go ahead!” His nod may have been a little too eager, but it was all worth it when Shadow, with a red face burning from shame and his own embarrassing wagging tail, finally moved his fingers, caressing the edges of the entrance, before slipping inside.

Sonic moaned through his bitten lips, watching carefully for Shadow’s reactions. He could see how flushed his rival looked, how his breath hitched once fingers were being sucked by Sonic’s wet and tight cavern. His red eyes were blown wide, pupils dilated, a look of awe and desire as he kept moving his index and middle fingers around.

“It’s… Warm,” Shadow noted, amazed, and Sonic could only whimper and nod, enjoying the feeling of finally having something inside of him, even if it was just two slow-moving fingers. Man, he was in no place to judge Shadow for being a virgin when he was all shaking and moaning with just two fingers. “And.. tight, it feels like you’re sucking me in…”

“Ahn- d-do you like it?” Sonic asks through half-lidded eyes, letting weak and breathy moans escape as Shadow keeps slowly pushing and curling his fingers around, feeling Sonic’s insides.

“It’s kinda gross.” Shadow confesses, a deep frown on his face, accompanied by a deep crimson blush.  “But it’s… Good.” Shadow shivered, and Sonic didn’t miss how he was pressing his hips down against the bed.

“What do you mean by gross?” Sonic asked, not to be offended, mostly teasing Shadow about the very unflattering choice of words, but there was also a smear of curiosity about Shadow’s thoughts.

“It should be gross…” Shadow winced, but Sonic had to put effort into paying attention when Shadow spread his finger apart inside of Sonic, spreading him apart and taking a few breathy gasps out of his lips. “It’s… Warm, sticky, wet, tight- and the scent is too strong- b-but…” 

The poor thing could barely finish his considerations, shivering with his own arousal, ears flickering, shaking his head in embarrassment, too ashamed of himself to finish his thought. 

“Does the smell bother you?” Sonic knew that if that was the case, Shadow would be long gone, but maybe Sonic is a little bit of a bully himself, because he very much wanted to see Shadow embarrassing himself to answer this.

“N-no… I…” Sonic watches with amusement as Shadow falters to find his words, sputtering and looking to the side, trying to avoid Sonic’s eyes, which was good, actually, or he may have noticed the smug expression on the blue hedgehog’s face. “It’s… Odd. Rationally, I should think it’s disgusting, but- it’s also… A-Alluring. It feels good.”

“Do you want to taste it?” Sonic blurted out, and he saw the way Shadow’s fingers (regretfully) left his entrance, but he could forgive it with the fact that Shadow made a strangled sound, his hands gripping on Sonic’s thighs, claws threatening to poke out from his fingers.

“W-what?” Shadow breathed, his chest fur all fluffed out, and his gaze focused down on Sonic’s slick. He made a sound that sounded way too close to a whimper. 

“You can taste it, if you want”. Really, Sonic could not blame Shadow for being a little sadistic with him, poking Sonic in certain ways to gauge a physical reaction, when Sonic was doing the exact same thing, but verbally. But could you fault him? Especially when Shadow looked so cute.

When Shadow kept staring, his eyes wide with surprise, but too afraid to make a move, Sonic took the bold decision of inciting him further. So he slowly slid his hand down, caressing his own body towards his dripping cunt, biting his lips as he thrust three fingers inside at once, purring with delight at Shadow’s almost strangled moan just by watching Sonic stretching himself around his own digits.

But Sonic didn’t spend too much time working on himself, he still had to finish his goal. 

Instead, he gathered a bunch of his own liquid and trailed it towards Shadow’s face, blushing hard at the sight of a string of slick still connecting his fingers to his entrance. 

“Here, taste it.” Sonic offered. Despite a lingering hesitation, soon Shadow was shakily opening his mouth, being careful not to puncture Sonic’s fingers with his fangs, closing his lips around the slick digits, and moaning once he tasted Sonic’s liquid.

Sonic felt himself shivering, feeling the way Shadow closed his eyes and lapped his fingers with eagerness, imagining how good it would feel if he were doing this directly on the source. And Shadow seemed to be enjoying himself too, breathing hard and letting small muffled noises escape, his fingers digging into the meat of Sonic’s thigh as he focused on sucking and lapping the invading digits.

Good boy,” Sonic purred, his words almost a little slurred from arousal. However, it seemed like that simple sentence, coupled with the taste of Sonic’s slic,k had triggered a strong reaction out of Shadow’s body.

Because soon he was turning his head away, gasping and closing his eyes with force, his ears pinned down, letting small and strangled whimpers escape as he kept pressing his hips down against the bed. Sonic watched with awe as Shadow fell apart, shaking and shivering, his hands holding so tight on Sonic’s legs that it would certainly leave bruises.

Sonic just waited until Shadow was breathing harder, looking down with shame, until he was coming down from his aftershocks, a hot spark of arousal as Sonic was hit with the realization.

Holy shit. Holy fucking shit.

“Did you just come?” Sonic gasped, eyes widening, a huge smug grin plastered on his face.

“I-I…” Shadow faltered, avoiding Sonic’s eyes, his whole face as red as a tomato. “I think- yes…” Shadow shifted, and Sonic could tell, by the slick sound between his body and the bed, that Shadow was probably dreading the sticky feeling against his body (if that uncomfortable expression was anything to go by), but he was still too ashamed to lift himself up and look at the mess.

“Wow, I’m flattered,” Sonic purred, crossing his arms under his head, his chest swelling with pride and satisfaction. Oh, he is never letting Shadow forget how he came just by being called a good boy. 

Shadow made a noise, an irritated one, opening his mouth ready to complain and probably tell him to shut up, but Sonic was quicker, sliding his hand down, bucking his hips upwards as he splayed his lower lips with his fingers, giving Shadow a clearer view of Sonic’s wet and puffy sex.

“So, do you want to taste directly from the source?” Sonic offers. Damn, he didn’t know he had such a slutty way of talking. Maybe it was one of his hidden talents. Or maybe being with Shadow was just doing things to him, to make Sonic want to keep enticing and provoking him.

Well, that doesn’t matter, because as soon as Sonic offered, in the blink of an eye, Shadow’s hands were firmly grabbing Sonic’s thighs, forcing them even wider apart, to the point Sonic was very thankful for the fact that he is flexible. Shadow’s muzzle pushes against Sonic’s cunt, a low growl vibrating against his folds as Shadow closes his mouth around Sonic’s clit and sucks.

“A-Ahn! F-Fuck!” Sonic almost screams, arching his back, his fingers fisting on the sheets under his splayed quills. His voice reaches a few octaves higher as Shadow keeps licking and suctioning his sensitive nub. It’s too much pressure in one go that it becomes almost a little too overwhelming. “Sh-Sh-Shadooow…”

By instinct, Sonic tries to clench his thighs around Shadow’s head, but his firm grip doesn’t let him, keeping him open and exposed. 

Sonic drools, closing his eyes, lost in the feeling of Shadow’s mouth caressing his clit over and over again, until he feels the hybrid slowly lowering his muzzle, giving Sonic barely any warnings before he slips his wet and long tongue inside of Sonic’s entrance.

And oh, Sonic never realized how big Shadow’s tongue really is until he licks his way inside, and just keeps pushing further and further inside. Sonic’s belly tenses up with the hot jolt of arousal, desperately gripping on Shadow’s quills and tugging him closer, whimpering as he can feel his nose bumping against the clit as his tongue keeps squirming inside.

“G-Good…” Sonic breathed through broken moans. “T-Try dragging it upwards, back and forth…” He instructed, and, being such a good learner that Shadow is, he obeys, squeezing the meat of Sonic’s thighs between his fingers, dragging the extension of his tongue against Sonic’s walls.

“Yes!” Sonic gasps, tossing his head back once the wet appendage finds the spot. Sonic bucks his hips, trying to grind himself on Shadow's tongue, desperately chasing his pleasures. “R-Right there- fuck Shadow, you’re so good!” Sonic mewls, his body heated with pleasure.

He can almost feel the vibrations of Shadow’s voice against his cunt, moaning and purring while moving his tongue against that sweet spot that makes Sonic see stars.

 Sonic is so grateful that Shadow is a fast learner, but fuck, he had teased Shadow about coming too soon, but right now, Sonic is barely being able to hold back an orgasm.

“Shadow! Shadow!” Sonic gasps, his nails digging into Shadow’s quills as he finally breaks apart. With a loud and desperate gasp, he can feel himself tightening around Shadow’s tongue,  giving shallow and weak breaths while the dark hedgehog keeps fucking his cunt with his tongue through it.

He kept going, until Sonic was tugging at his ears trying to pull him away, until his moans were weak and broken from the overstimulation, only then that Shadow stopped, letting go of Sonic’s legs, allowing the hedgehog to lie limp on the bed, his chest still rising and falling in a quick motion, trying to catch his breath.

Blue ears flickered at the loud, wet, and lewd noise that echoed through the room when Shadow finally moved his head away, letting his tongue slowly move out from Sonic’s insides, allowing Sonic to get a glimpse of how lengthy it is, squirming with the knowledge that all that was inside of him just a few seconds ago.

Sonic watches, with pupils dilated and mouth agape, the lewd way that tongue licks around Shadow’s lips and muzzle, cleaning some of Sonic’s juices still clinging to the fur, before making its way back inside.

There is no way Shadow is really a virgin and doesn't know how much he is making Sonic all hot and bothered, even if he just came. Maybe this is one of the perks of being the ultimate lifeform, being naturally so sexy.

“Sonic…” Shadow calls him, his voice rough, low, desperate. It almost makes Sonic moan just by hearing his name being called like this. 

But of course, nothing compares when Shadow moves forward, climbing atop Sonic, caging his head before his arms, his elbows located right beside Sonic’s sprawled quills, being so close.

Sonic’s body jolts with a new wave of arousal when he feels Shadow’s warm body covering his own, pressing down against him, chest to chest, belly to belly, and- oh.

He hasn't taken a look at what Shadow has between his legs yet, but he can feel it dragging against his folds. It is something thick and lengthy, and there is something, some kind of texture on the underside that almost makes Sonic squirm and arch by how it feels against his clit.

“Sonic,” Shadow pleads once again. This time, his voice is even graver, closer to Sonic’s ear, sending goosebumps through his spine, his nose bumping against Sonic’s, his heavy breathing hitting against Sonic’s lips. “I-I… I need-” Shadow struggles to voice his needs, his words stuck on the back of his throat, whimpering almost like a puppy.

“Fuck, Shads…” Sonic breathes, biting his lip, trying to keep himself cool. “Do you want to put it inside?”

At this, Shadow pauses, his ears shooting upwards, leaning back so he could stare at Sonic with bewilderment, like he wasn’t even aware that this was going to be an option.

“You mean to have intercourse?” He frowned, his whole face flushed red, putting enough distance between their bodies so he could look at Sonic’s sex. “I didn’t think you would allow me to…” Shadow stops, thinning his lips, perhaps a little embarrassed.

“Just to be clear, we are not gonna do this for breeding,” Sonic says, a little self-conscious and worried. Shadow scoffs, rolling his eyes, but still, somehow, deep in his mind, Sonic still thought that was necessary information. 

“You don't need to tell me that.” Shadow rasps, even if Sonic stares at him doubtfully. “But… I suppose we can… Proceed. With the intercourse…” 

“You can just call it sex, you know,” Sonic snickers, much to Shadow’s annoyance. “Or fucking. ‘Intercourse’ sounds so funny.” But even as he teases, Sonic is lying back, letting his legs wide open so Shadow can have full access once again to his wet entrance.

Shadow makes an annoyed noise, this time not granting Sonic a verbal answer, instead just leaning back and sitting on his ankles, taking a better look at Sonic’s sex once again, as if mentally trying to prepare himself for what will come next.

When Shadow leans back, Sonic also takes the chance to tilt his head forward, his eyes descending downwards until he can finally take a good look at Shadow’s cock.

Oh Gaia…

Well, he had felt how thick it is when it was rubbing against his folds, but actually taking a view of it made Sonic feel almost intimidated at how long it is. There is also the fact that it is nothing like a hedgehog penis. The tip is more pointy, shaped almost like an upside-down heart, and there are some small, hard nubs that almost look like blunt spikes decorating the whole length. 

And, more intimidating, right at the base, there is a knot.

Maybe Sonic really does not have any good survival instincts because at the same time he feels fear, he is also desperately wanting to get it all inside of him.

“So…” Shadow swallowed down harshly, his hand caressing the softness of Sonic’s belly, slowly trailing downwards until it was resting on the top of his mound. “Now I am supposed to put this…” He says, glancing downwards at his own monstrous penis, before thumbing against Sonic’s entrance with his pawpad. “Inside of here?”

“Y-yeah, pretty much.” Sonic nods, almost a little too eagerly. “I-I mean, some people like to explore with anal- b-but for all purposes, yeah, go ahead.” Shadow tilts his head, a deep frown, a questioning gaze in his eyes. 

Sonic was almost thinking that Shadow was going to ask him what is anal, or something like this, but instead he was left gasping when Shadow just pressed himself forward, his crotch in between sonic’s thighs, his dick resting atop of Sonic’s peach-colored belly, making him falter, his breath hitching at the warmth and the weight of Shadow’s cock, now resting against his pelt.

“S-Shadow?” Sonic asks, biting his lip, wincing at how high-pitched his voice sounded. He could feel his cunt clenching, empty, and the feeling of Shadow’s cock just weighing against his stomach was doing nothing to distinguish this burning need. “P-Pretty sure t-that this is not where it’s supposed to go,” Sonic laughs. Cracking jokes helps to distract him from how wet and needy he is.

“I know.” Shadow growls, his face still in a deep frown, eyes staring fiercely at Sonic’s body. His claws rake slowly against Sonic’s sides, earning a few gasps and goosebumps from the eager hedgehog, slightly squirming when Shadow closes his hands on Sonic’s midsection, just a little bit above where the head of his cock was reaching, brushing against Sonic’s belly button.

Sonic gasped, his ears flickering, his whole body heating up, trying his best not to whimper as Shadow kept just narrowing his eyes, slightly thumbing Sonic’s fur with his claw.

“W-What's wrong?” Sonic gasped. He feels antsy, in a good way, with Shadow’s hands firmly grabbing his waist, with the heaviness of Shadow’s cock pressed up against his front. It makes Sonic's body anxious and desperate at the same time.

“Just…” Shadow’s frown deepens, and as much as Sonic can feel that large member twitching on top of him, he can see that Shadow has a troubled expression. “I am… Trying to measure your body, but it doesn’t look like it would fit inside you.” 

This time, Sonic can’t stop a noise from escaping, his thighs clenching against Shadow’s sides. His heart pounds faster, and he is sure he is salivating. As much as this should be terrifying, this is also the hottest thing that has ever happened. Not that he even has a lot of relationship experience to compare, but oh, oh damn…

“Fuck- I-It doesn’t matter if it fits!” Sonic groans, grabbing Shadow by his shoulders, almost clawing him as he drags Shadow closer once again. “Just put it inside of me!”

Shadow blinks, taken aback by the sudden outbursts, but if the way his dick twitches is any indicator, he doesn’t seem bothered by it. Shadow moves back, enough so he could align his tip against Sonic’s folds, finally pushing forward.

Perhaps neither of them was expecting how easy it would be to slip inside, because in a weak thrust, Sonic is finding himself already too full, gasping and squeezing Shadow’s shoulders, stabbing his nails against his fur, too overwhelmed with the sudden stretch.

“S-Shadow!” Sonic whimpers. “Wait-Wait!”

Thankfully, Shadow is good enough not to punish Sonic for his own foolishness of asking to be filled up without any caution first, so he pauses, even if he growls and jabs his claws on Sonic’s pelt with the effort of keeping himself still.

“Fuck-” Shadow growls, gasping, shaking. ‘What is wrong?” He forces himself to ask, but he almost snarls as he does so, clearly aching to do more, to keep going, to fully sheathe himself inside.

“I-is just…” Sonic tries to breathe, squirming, feeling his walls being stretched beyond their capacity by Shadow’s cock. He can sense the slight dig of those pseudo-spikes against insides, making him feel even more sensitive. “Ah… G-Go a little slower…” Sonic winces, one of his arms letting go of Shadow so he could hide his face behind it, too nervous and overwhelmed to look.

Sonic gasps, a little pained, when Shadow gives a small thrust. Maybe Sonic is some kind of masochist, because, as much as it hurts, the painful stretch also feels good. And the cute expressions Shadow keeps making on top of him are also doing wonders to distract him from the pain. 

Because Shadow looks so cute with his brow furrowed in concentration as he tries too hard to keep a slow pace. He is almost whimpering, biting his lip, giving weak and shallow thrusts of his hips, with just halfway of his member inside. 

It brings Sonic some kind of dark satisfaction watching Shadow crumbling down like this, trying his best to keep in control, almost crying like a needy puppy, all because Sonic told him to go slow. 

“Nhmm… Good boy…” Sonic purrs in between his weak moans. The way Shadow’s claws prickle and squeeze his pelt is a little painful, but it’s all worth it by the strangled mewl Shadow lets escape, his fluffy ears flickering at the praise. Sonic can even feel Shadow’s tail wagging, brushing slightly at his legs.

Maybe Sonic should make a list of kinks to explore if Shadow ever wants to have another round of “sex education”, because he is very sure Shadow would love some puppy play.

“S-Sonic…” Shadow gasps, desperate, his hips moving in quick and short thrusts, barely being able to push deeper, just rubbing the length and those blunt spikes all over Sonic’s inside walls. “Dammit- this feels…”

“It feels good, doesn’t it?” Sonic smiles. Teasing Shadow is good, it helps to take his mind out of the overwhelming stretch. 

However, Shadow takes Sonic’s easy demeanor as a sign that Sonic was well enough to give a rough and deeper thrust. One hard enough it has Sonic losing his footing once again.

“It- feels good…” Shadow rasps, growling, as he moves once again, this time with more intent, chasing his own pleasure while moving his hips faster, deeper.

“S-Sh-Shadow!” Sonic gasps, squeezing Shadow in his limbs, unable to keep himself cool when Shadow’s cock is railing his insides, the thickness of it railing against Sonic’s sweet spot over and over again.

 Sonic cries, overwhelmed with the pain and the pleasure, all mixed together in a hot cocktail of adrenaline that makes everything feel so much better. 

Shadow growls, his hands still gripping with a bruising force on Sonic’s waist, holding him steady in order to rut against Sonic’s body. Sonic can feel the thickness of his knot hitting his folds every time.

“S-Shadow- W-wait-” Sonic can barely finish talking, being interrupted by the lewd thrust that pops the knot inside, stretching Sonic’s entrance much larger than before, forcing Shadow’s cock all the way inside.

For a moment, they both still, Shadow catching his breath, and Sonic squirming and grabbing Shadow for dear life, his knees weak at the feeling of Shadow’s tip kissing at the deepest parts of his insides, overwhelmingly so.

“Sonic…” Shadow groans, his voice coarse, low, almost growly, breathing heavy and hot against Sonic’s neck. “You… Feel so tight inside…” Shadow says with a weak thrust, earning a strangled cry from the hedgehog under him. “It’s… Good…”

“Fuck, Shadow…” Sonic moans, tossing his head back, still clinging into Shadow’s back, not being able to form better coherent thoughts when Shadow moves with a firmer pace, his knot popping in and out of Sonic’s hole every thrust. Sonic cries, fisting Shadow’s fur between his fingers, gasping at the deep thrusts. 

Sonic could feel the coil of arousal getting tighter every thrust, his cunt, stretched beyond its limits, milking and spasming around Shadow’s cock as he could feel himself getting closer to his orgasm. And by the desperate movements Shadow was giving, he was in no doubt getting closer too.

Sonic stuffed his hand against Shadow’s neck, whimpering muffled by his soft fur, clinging desperately into the dark hedgehog with one arm while, with his free hand, he slowly moved to rub circles into his clit, gasping with the overwhelming stimulation as he comes, tightening around Shadow’s cock, arching his back when his cunt gushes a hefty volume of slick.

“A-Ahn- fuck-!” Sonic sobs, his hips giving a few weak bucks with Shadow’s final thrusts, making Sonic whimper, squirting all over Shadow’s fur and cock. It’s a little embarrassing to do so, especially since he was never able to make himself squirt when playing with his fingers only.

The hot white sensation of pleasure is so much that Sonic feels himself frozen in place, squeezing Shadow’s body, grounding himself while Shadow keeps pushing, forcing his knot inside one last time, rutting against Sonic through the intense orgasm.

The blue hedgehog squirms, overstimulated, feeling Shadow giving a few final humps, grinding his knot inside, growling, and embracing the blue fur’s body tighter against his own while flooding the insides of Sonic’s heat with a thick volume of cum. 

Mental note: buy a morning-after pill. Sonic considers mentally, still clinging to Shadow.

For a moment, they are both silent, just clinging onto each other, trying to catch their breaths. It was Shadow who tried to move away first, slowly letting go of Sonic, planting both of his hands against the bed, trying to pull himself away. Which earns a pained hiss for both of them when the swollen knot tugs at Sonic’s entrance.

“Hey! Stop!” Sonic growls, holding Shadow closer to keep him from trying to move away. “You knotted me. We are going to be stuck for a little while.” Sonic explains after he notices Shadow frowning in confusion.

“How long?”

“Eh, dunno, it can vary from species…” Sonic shrugs, but he can’t help but squirm at the sensation of his insides being way too full with Shadow’s lengthy cock plugging all that cum inside. It was… Weird. But not entirely unpleasant.

“What am I supposed to do now?” Shadow’s frown deepened.

“Eh, cuddle, I guess? Relax, dude, we are not stuck like this forever.” Sonic grins, giving Shadow a few pats on his shoulder, giggling when he earns a huff and an eye roll out of the hybrid. “Can we just switch it up? It’s starting to be a little uncomfortable under you…”

Sonic could hear Shadow grumbling under his breath, yet he still gently cradled Sonic in his arms, rolling their bodies to the side until Sonic was the one resting on top.

“There. Are you happy now?” Shadow hisses, still holding Sonic firmly by his waist. The blue hedgehog only wags his tail, nuzzling against Shadow’s neck, getting himself comfortable.

“Nhm… Yeah, despite the big dick stuck inside, this is actually pretty comfortable,” The hero purrs, taking the opportunity to stuff his face against Shadow’s chest fur.

“Hm…” Shadow pauses, staring at Sonic. “So, every time we have intercourse, this knot thing will happen?”

“Oh, why do you want to have sex with me again?” Sonic’s grin widened, his tail wagging faster at Shadow’s blushing expression.

“Hmpf….” Shadow looks away, his cheeks flushed red.

“But, yeah, only if you have your knot inside,” Sonic says, a small purr as he nuzzles against Shadow’s neck, still feeling the weight of the cock twitching lazily inside of him. “And, don't worry, I am willing to let you… Get another ‘sex education’ lesson in the future.”

Shadow groans, rolling his eyes, embarrassed, trying to avoid looking at Sonic, but at the small smile in the corner of his lips, Sonic knows that this is not going to be their last lesson.

Notes:

Got lazy at the end, sorry
I kinda hate writting the penetration part, sorry guys