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Was it five bottles? Or eight? No, Sonic is almost certain it was seven? Seven full water bottles, even though he has no idea where Shadow kept pulling them out from. Once one was empty, they had a few more minutes to run around before taking another break and the blue hedgehog was encouraged to rehydrate himself.
Sonic knew the game, so he didn’t argue as much as he would have if this were a normal sunny day in Green Hills. Not that Shadow was giving him much of a choice, stern eyes and forceful tips of the end of the water bottles to make Sonic drink them down faster. There were more than a few times he had started choking, and Shadow rudely would tell him to get over it before putting the water back in his face, impatiently waiting.
They both knew all it would take was one special, safe word to get him to stop entirely.
Sonic wouldn’t.
Because he was going to fucking win this.
He had to. His chance at tying Shadow up in bed quite literally depended on it.
Via some very soft pillow talk between the two of them, they had gotten on to the topic of kinks they were interested in trying yet had never done before. Sonic can still remember the way Shadow’s face scrunched when Sonic admitted he wanted to try being more in control between the two of them in the bedroom. Disbelief more than disgust.
Sonic had flushed darkly, ears flat back on his head, and grumpily told Shadow that it wasn’t like he was given much of a choice to ‘play the other side of the field’ with how dominant and aggressive Shadow was.
“I think it would be fun, switching up our roles. I’m not saying I need you to bottom for me, I just think, like, it’d be fun to have control for a night over you. Have you teased to your limits for once.”
And of course it was met with an ultimatum. Shadow wouldn’t just give it to him for free. He had to fight for it.
Their immediate wrestling match in bed ended with Shadow’s win.
Their run up the hill in the morning predictably ended with Shadow’s win.
The impromptu hot dog eating competition at lunch, gave Sonic one win.
And he finally evened their score in a foot race to the far side of the island, only by virtue of catching Shadow off guard when calling the start of the race and zipping off before Shadow could catch him.
Now, all he needed was one more win.
Shadow, ever the weirdo, and proving Sonic’s mental image of him being a complete pervert right, had suggested, shockingly, that if Sonic could make it until sunset without needing to use the bathroom once , then he would concede the win.
“Oh eeeeasy ,” Sonic scoffed, feeling smug already at how incredibly in the fucking bag he had this one. That is until Shadow had smugly handed over the first water bottle with his own small, evil smile. (Okay, maybe not evil, but Sonic had felt like Shadow suddenly became the most heinous villain he had ever faced at that moment.)
And now here he is, what was it again? Nine–? Water bottles full and finally feeling the first small twinge in his belly.
“What are you stopping for? You were the one that suggested we run around the island until sunset to use up all the liquid,” Shadow paused when Sonic did, turning to mock him in a voice that totally wasn’t like Sonic at all thank you very much.
“This isn’t fair,” he whined, “you’re sabotaging me!”
Shadow rolled his eyes, “Oh whatever. I didn’t say I would be playing fair. I gave you a goal and you accepted without setting up boundaries. That’s on you, idiot.”
“I’m the idiot for not thinking that you would have some integrity and respect a challenge.”
“You of all people talking to me about respecting a challenge?” Shadow gave a short, incredulous laugh.
Riled up, Sonic was so close to stomping his way over, just three big strides, and he could shove the darker hedgehog or maybe punch him in the face, or–
The cramps in his belly stop him in his tracks. He grunts, uncomfortable, and places a hand low on his belly, shocked to find it slightly distended. There’s a familiar twinge deep in his hips, one that tells him he has maybe ten minutes to go find somewhere to go pee before he starts to get uncomfortable.
Huh…
He’s never had to actually hold it before.
Maybe just a few minutes longer to find a place to use the bathroom, but never like this. Where he knows he needs to go, but he’s going to have to hold it until… Sonic looks off to the horizon, squirms in discomfort because there’s easily three more hours until the sun gets low enough to try and convince anyone that it’s sunset.
“Come on,” Shadow coerces, voice soft, and Sonic looks up to find him holding out yet another water bottle. Okay, what the actual fuck? How is he doing that?
“Where have you been keeping those, man, this is getting ridiculous.”
Sonic doesn’t get an answer aside from an eyebrow being raised and the water bottle a soft shake, sloshing the water inside. Sonic frowns at the noise and sight of it, feels the cramp in his bladder again that signals he is full.
“You look like you need a drink,” Shadow says.
“I need to be left alone so I can concentrate,” Sonic bites out as he snatches the water bottle out of his rival’s hands and drains it in three big gulps, crumpling the plastic in a fist.
“You need to learn to stop whining so much.”
“I’m not whining, I’m lamenting. You are so cruel to me, you want me to suffer and hate everything good in this world.”
Sonic feels a little bit of pride in watching Shadow’s ears flick back when he rolls his eyes. It always counts as a small win in his head when he can annoy Shadow. It’s easy nowadays, well, actually when has it ever been difficult? Maybe since Shadow had learned to accept the ‘enjoying being around Sonic’ side of himself and found Sonic’s antics to be more endearingly bratty than just annoyingly prickly.
Now it’s coming back to be more of a nuisance. Sonic would probably be able to concentrate better on a fight, rather than this… weird… soft… whatever Shadow is doing. Caring for him? Looking after him?
No, the bastard is just watching, waiting to rub his win in Sonic’s face. Stupid, that Sonic would even consider losing this, but the cramping is really starting to hurt now.
Still, Sonic snatches the water bottle offered like a good sport and downs it. He’s no sore loser. Not that he’s going to lose this thing.
Determined, Sonic keeps moving. An aimless direction he picks where he’d last been facing, wandering out into the lush green grass and occasional bloom of wildflowers clustered and brushing their knees from the overgrowth. It’s easy to get distracted like this, meandering and counting the colors, lilacs and pinks and whites and yellows. Five petals, seven petals, twelve.
They’ve just been idly walking around in the meadows for an hour by now and Sonic’s pacing has begun to take an almost frantic set to it. There’s only so much semi-calm walking a guy can do with a full bladder. He speeds ahead a few steps before stumbling to a complete stop, flexing every single muscle from the waist down, knocking his knees, and taking a handful of deep breaths. His hands are shaking.
He’s either going to lose this and piss himself in front of Shadow, or he’s going to win this, and piss himself as soon as the sun sets and… right in front of Shadow. Gaia, he’ll win but at what cost? Stupid, stupid, stupid for taking this on without thinking–
“What are you mumbling about over here, Hedgehog?”
“Thinking about the best way I’m going to kick your ass when this is over,” he hisses, slinging an arm low over his waist protectively when Shadow draws closer. Sonic can’t help but whine when his bladder cramps again, right behind the first cramp, sending him slightly bent at the waist.
Without realizing, Sonic quickly tucks a hand between his legs, pressing up hard. There’s a hair-raising shiver that runs up his spine, dread like cold water on his neck when he feels the way his body is ready to just release whether Sonic is actually ready for it or not. He’s had plenty of time to find a bush or a tree to squat up against, according to his bladder, and now there’s no more time for waiting. The only thing stopping him is the physical block of his hand tight against his urethra, painfully, desperately, pushing harder because it’s not enough and it’s gonna leak and–!
“You’re not even listening to me,” he distantly registers from behind— of fucking course he’s not been listening to Shadow’s pointless, ribbing yapping— before Shadow’s hand is clocking him on the back of the head lightly, musing up his quills, making one of his ears flick in irritation when he stumbles forward–
Sonic gasps, and no amount of clenching, tensing, pressing, can stop the way a short stream of pee dribbles down his thigh when he steps forward to catch himself from falling.
“Shit–” he whines, dropping into a crouch suddenly. He manages to get it to stop before the floodgates release, grinding the hard heel of his hand up between his legs so hard it hurts.
The sky has turned all pretty pink, purple, orange, clouds like a watercolor swatch of brushstrokes. The sun is still bright and just along the line of the horizon. An hour. If he could just hold it for one more hour–
His body is screaming, cramping aches between his legs, low in his belly, and now a headache from how hard he keeps clenching his jaw. He can sense Shadow circling him, but can’t make himself move from his position now, both eyes pressed into his knees as he takes shaking, heavy breaths. Breathing through the ache when his bladder goes through another series of cramps.
“You’re going to hurt yourself,” Shadow’s voice is closer, right on top of him. Too close.
Sonic feels his ears perk forward first before he lifts his face enough to open his eyes and squint, only to whine, face hot, ears pinning back, when he realizes Shadow is literally inches in front of him.
“Go. Away. ” he bites out. Shadow’s too distracting, but even more than that, Sonic wouldn’t be able to fucking live with himself and the mortification of accidentally peeing on Shadow. He’s too close, all up in the splash zone and Sonic can’t–
“It’s not that serious, Sonic,” Shadow glares at him, and Sonic is holding himself so tightly he can’t even jerk himself away when Shadow gets right up between his legs– no no no–
“Mnnghhf–” he whines, bottom lip bitten between his teeth to give himself something to focus on instead of his full bladder. Pain is easier to keep his attention on, not Shadow sitting down in the grass, hands guiding Sonic’s hips up over his thighs, reaching down to grab Sonic’s wrist.
“Let go,” Shadow says. Sonic shakes his head hard, stomach cramping as he stares at the sun taking it’s sweet fucking time crawling down the skyline. Just a little longer…
“Sonic.”
“No.”
“I’ll let you have the win, just move your hand, idiot.”
But he doesn’t want a pity win, doesn’t want a win based on Shadow throwing in the towel because he’s… what? Concerned? It sounds that way, but that can't possibly be it. Sonic tries to hold out, pain burning between his legs now. He grits his teeth, prepares for the humiliation and simultaneous relief of the release and– nothing.
Shadow blinks at him expectantly, looks only half as confused as Sonic feels, and they both watch as he tucks a dark hand between blue thighs.
“What? Shy now?”
“N– No. I feel like I’m going to explode, I– I don’t know–” Confusion feels like an icy balm. Now that he’s relaxing, allowing his body to go, it won’t.
Oh chaos what if he broke himself? Fucked his body up so bad he can’t pee again???
Shadow must notice something Sonic doesn’t. Maybe it’s the shaking? The trembling? The worried, scared pinch of his face as he stares between his legs, stares at the obvious swell of his belly where his bladder is pushing out.
“Here, idiot,” Shadow hums quietly as he takes his other hand against Sonic’s arm, guides it up to his shoulder where Sonic immediately grips tight, “Just relax.”
“I fucking am,” Sonic growls in frustration, another sharp cramp spiking. It feels like being stabbed.
“You’re too in your head about it,” Shadow’s voice is soft, almost a coo, and Sonic can’t even register how odd that feels over the mounting frustration and fear and desperation to just have release already please Gaia please.
A gasp falls free from his mouth when the pressure changes. Pressure pushing out from the inside now to pushing in. Shadow’s fingers, two of them, slipping up inside–
“What the hell are you doing-!” Sonic whines, tingles from his belly racing up his spine.
His hands immediately grasp at Shadow, one on his shoulder, the other trying to blindly reach between his legs and only succeeding in gripping tightly on the wrist of the hand around his waist.
Shadow doesn’t offer any explanation yet, any consolation or chastising for the grabbing or his squirming. Doesn’t have to, he has enough control now with the two fingers knuckle deep and curled inside, pulling slightly with his whole arm and humming, satisfied, when Sonic’s hips pull forward at the motion with a breathy gasp.
“Nonono– Shadow I’m–!” Sonic’s claws dig in, thighs softly shaking. Whatever it is, it sounds urgent. Sure it is, with how much he’s been drinking. All he needs is a little help. Distraction. A little coercion.
“Breathe. Relax.”
Sonic growls in his throat. He’s getting real tired of Shadow telling him to relax. If he relaxes even a single atom of his being right now he’s going to–
Warmth trickles out of him in a mortifying squirt as Shadow curls his fingers again, flat pads of his fingers nudging, shoving at his full bladder. The muscles in his pelvis are growing tired, and his thighs start to shake from the force of trying to hold back. The tension in his arms and back hurts , feels like his teeth might crack if he clenches them together any tighter.
“Please don’t–” he whimpers. Too late.
Sonic feels Shadow twisting his fingers again, spreading, a third easing up inside and taking up room that Sonic doesn’t have to give anymore.
The fire in his face and at his neck is scalding. A burning, shameful wash that has his fur standing on end when he feels himself release.
Sonic just barely manages to jerk himself into Shadow’s chest, face hidden in his shoulder as he sobs. The trickle turns into a gush and then a stream. Right into Shadow’s hand, right on his lap. There are tears burning hot in his eyes as he keeps them squeezed shut, clinging to Shadow, ears pinned back flat. It still doesn’t block out the mortifying rush of how hard he’s pissing himself.
Shadow isn’t even saying anything either, and Sonic doesn’t know if that makes this better or worse. His fingers are moving though, ever so gently rubbing him from the inside out, hand entirely soaked wet up to his forearm, splatters even getting up to his elbow, his belly, his knees.
The ground takes the worst of it, honestly. Shadow can feel the hot spray jet against his palm when Sonic’s body releases. Warm as it dribbles off his hand and wrist into his lap. It feels never ending, going and going and going until his entire lap is also drenched soaking wet from his hips to his thighs.
There’s the slight, sour ting of it in the air, catching Shadow’s attention. He lets his other hand brace against Sonic’s lower back, feels the way the trembling of his legs and arms rock his entire body too. Sonic keeps making these small noises, like he’s miserable, whining and gasping and half-hiccupping.
It feels like forever until the stream begins to trickle to a stop. Shadow pulls his fingers out with a wet little slop, finds his knuckles literally dripping with urine onto the grass when he holds it off to the side.
“There. Feel better?” Shadow asks, trying to play it off nonchalantly. Knows Sonic would bolt on him if he didn’t pick his words carefully here.
“Asshole,” is hissed at him before a hand thumps him in the chest.
Sonic feels entirely spent, worn out, weak. But his bladder does feels better, so empty in fact that now that it aches. There’s a burning deep in his hips and right at the front of his pussy, and he swears to everything good in this world if he somehow got a UTI from holding it for so long he’s wringing Shadow’s neck first–
His claws dig into dark shoulders when he suddenly topples backwards. Initially, recovering from the sudden shift and the slight wind knocked out of him, Sonic doesn’t understand what’s going on until he feels the wet puddle under his ass, soaking his fur and his tail and creeping up his back from where he’s laying.
His face screws up, nose wrinkling in disgust at the feeling of wet warmth soaking his fur down to the skin. He has half a mind to bitch Shadow out right now, opens his eyes and–
“Oh what the fuck –”
Shadow’s entire cock is out, hard and wet between Sonic’s legs, and Sonic blinks wide owl eyes as he watches Shadow’s still dripping wet fingers slip over his own length, angling down–
Sonic’s foot is caught by Shadow’s hand just before it nails him directly in the face.
The shame and embarrassment is quickly barreled down by indignation, rage, violence, a crushing need to punch Shadow’s smug, smirking face in. He’s realizing much too late that Shadow had already won their bet from the very start.
“You cheater, you filthy, disgusting fucking–”
“You’re too gullible, Sonic. Should have picked up on it from the second I suggested it.”
Sonic realizes he’d been played. Of course Shadow would be into piss. Not that Sonic actually expected it but in his hot, blind rage, anything to solidify ‘PERVERT’ in eternal stone above Shadow’s head in Sonic’s mind would do. Piss. The sick bastard–
Sonic feels the tip of his cock press in, much too wet for how significantly not turned on Sonic is and he shivers realizing it’s his own pee. No, absolutely not–
Their safeword is right on the tip of his tongue, right there in his throat, and Sonic is ready to scream it to the heavens before Shadow actually fucks him. The pressure pulls back though between his legs, and Sonic watches confused as Shadow leans back just a touch, working himself over with his soaked hand.
Cum trickles out across Shadow’s own hand and fingers in messy spurts. Sonic can only watch on with his mind ringing, blank, stunned. It feels like a dreadful handful of minutes go by before Sonic’s brain reboots itself, watching Shadow casually rub the most of his own release into the grass.
“What? Thought I’d actually fuck you? Should’ve seen the look on your face.”
“Oh fuck off. You’re such an asshole,” Sonic withers, stomach feeling oddly squirmy and gross.
“You don’t want your winning prize? Told you I’d give this one to you.”
“It wasn’t even a fair competition! You were getting what you wanted from the very beginning!”
Shadow stands, obviously listening, with the way Sonic notes one of his ears tilted towards him. But he’s acting like it’s no big deal. Cheater! Absolute liar, manipulator, cheating, deceiving–!
“I’m going to tie you up and leave you for days,” Sonic threatens with a hiss, glaring when Shadow offers his hand down to him to help him stand, notices it’s the hand still damp with urine and wrinkles his nose, hot in the face, “ weeks!”
“Oooh, how kinky. Starvation. Didn’t pin you to be so gruesome.”
Sonic is already imagining the various, tight works of shibari knots that would have Shadow so tightly bound he couldn’t even Chaos Control his way out of them. Thinks about making him watch as Sonic got himself off in their bed until he was begging to touch, or better yet, using Shadow as his own personal toy to ride until he was sore and on the brink of death.
“Scary face you’re making, Hedgehog. Come on, plot my painful demise in the shower. Let’s get you cleaned up.”
“I’ll get myself cleaned up. Alone, thank you very much.” Sonic stumbles up to his feet, grumpy when he curves out of the way of Shadow trying to walk closer to him. Shadow’s smile is only irritating him off more, amplified as his wet thighs get cooler.
Lucky for him, Shadow doesn’t say anything more, knows he’s still on Sonic’s good side since halfway into their walk back home, Sonic shyly claps their hands together, lacing their fingers tight.
Either way, a win’s a win.