Mix-up (Rick and Morty)
"R-Rick, I-I-I need to pee...!"
The scientist looked over at his shivering granddaughter, his brow raised in curiosity. Morti sure had taken her sweet time, since the start of this adventure, to tell him that - considering that, by now, they had visited two different planets, each with enough bathrooms and wild bushes available, and had been flying through space for the last hour.
Meanwhile his granddaughter felt like kicking herself in her own ass. The teen had felt the distinct pressure in her bladder for a long while now, but had always postponed her bathroom break, in the full believe that this current adventure would be a quick one and that she could hold it until the end.
Turned out she really couldn't.
Morti squeezed her quivering thighs close together, her self-control at its limit. Her panties were already starting to feel a bit damp and there was a sharp pain in her lower belly. She looked at Rick with utter urgency in her eyes.
"Pl-please tell me y-y-you have some of those-... those insects of yours!"
Now Rick knew for certain that it was an emergency. Morti never asked for those. She always found it too disgusting to eat those things, so they could move around inside her body and absorb her pee. Which Rick could never understand, as he himself found those things quite handy.
He quickly opened all his gloveboxes, hastily searching for those insects, before his granddaughter could flood his ship. Luckily he found them right away and handed a few over. Morti looked at the writhing insects in pure disgust, seemingly thinking her own decision over. But another sharp pain in her bladder made her swallow her apprehension... and the insects.
"How long u-until they work?" Morti's voice was strained, as she had to use all of her available strength to hold her bursting bladder closed.
"A few minutes, at least. Those things aren't m-miracle workers, Morti. You should've said something sooner!" Rick admonished her with an annoyed look.
So, it was now a race between the insects and Morti's self-control. The teen groaned in despair. Though she also knew that she had no one else to blame but herself.
Seconds passed, which quickly turned to minutes. Morticia was sweating from all her straining, her bladder feeling hot and heavy. In fact, everything was starting to feel hot and heavy, the longer she waited.
It all happened gradually. At first she breathed a little bit harder from the tight pressure inside her, but soon she was openly panting. Her body grew warmer, until it was burning from the inside out.
And when her self-control gave out a bit and let a short spurt escape, Morti's entire body twitched from the intense feeling, her crotch quickly growing wet - and not just from her pee.
"Rick, s-something's not right!" Morti half-spoke, half-moaned, her panting growing even stronger.
The scientist had noticed it himself and he quickly looked at the insects again.
"...Crap. I accidentally gave you the wrong ones. Th-those ones were mine."
Rick didn't elaborate further on what these insects did or why he needed them, but judging by how turned on the teen was quickly getting Morti had a pretty good idea.
In the meantime the brunette now had two pressing issues at hand. One was her aching bladder, while the other was her sudden and overwhelming arousal. Great...
"C-c-can't you do something, Rick?" Morti demanded, her desperation quickly rising by the second.
"Like what?! I'm already looking as hard for the right insects, as I can!"
Morti shut up. And squeezed the seat under her for dear life, as she kept her shivering muscles as tightly clenched as possible, all while her own body was screaming at her to do something! To move, to piss, to touch herself! Just... anything! Morti resisted its loud demands for as long as possible, growing more tense by the second.
Another spurt shot out of her, this one a second longer, and warmed her crotch even more. Morti bit her lip, when a sharp wave of euphoria raced through her entire body and made her tingle all over. She felt light-headed.
She was half-tempted to relax her muscles right then and there, just to continue this wave... but the other half was all too aware of her grandpa sitting right next to her. If she pissed herself in front of Rick, she wouldn't live it down for weeks.
If she came in front of him, she would never live it down.
"Found them!" Her grandpa finally exclaimed, turning towards her with a hand full of new insects. But before he could hand them over, he heard a distinct hissing coming from his granddaughter's bottom, which was immediately drowned out by her long, throaty moan.
The teen was writhing in her seat, her cheeks painted a deep crimson, as her body was wrecked by burning waves of euphoria; all while her legs kept violently twitching, as she fought urgently to stop her flow. She succeeded, eventually, but not before a small, visible puddle had formed underneath her butt.
Instead of relieved the experience had left her highly anxious; her entire body tense, after it was deprived of its relief. Morti gave off a high whine of need, already missing the feeling of release.
Rick wordlessly put the insects back into the glovebox, realizing that it was too late. Then, granting Morti some privacy, he turned his head away from her.
Surprisingly she managed to hold her pee inside for another full minute, even when her bladder gave of multiple spasms. But soon the strain proved too much and she started pissing again... and didn't stop.
Morti looked down at her crotch, blushing and panting, as a steady flow of water seeped out of her jeans and fed the puddle underneath her, until it was dripping down from her seat.
Her entire lower belly was burning up and, paradoxically, she felt the pressure between her legs increasing, instead of decreasing.
Before she could wonder about this, her climax hit her.
She barely managed to bit back a moan, as she threw her head back against her seat. The feeling was overwhelming, filling her with so much need and bliss and shame...
And it wasn't letting up. Her orgasm continued, long after it was supposed to end. The answer, as she would soon find out, lied in her bladder. It was still achingly full and with every drop she pissed out, the euphoria kept her in an iron grip.
With a last, desperate whine Morti fully gave into this feeling and started moaning unabashedly.
For almost a minute the teen was in heaven, experiencing the highest pleasure possible, as she blissfully flooded her panties...
Afterwards, once all the pee and arousal had left her, she was in hell, completely mortified about what she had just done. And in front of Rick, no less!
The teen looked down in shame, at the massive puddle underneath her seat, wondering about all the ways that her grandpa would make fun of her from now on.
Rick, meanwhile, wasn't even thinking about teasing his granddaughter. The scientist was deep in thought, after his discovery just now that urination, in combination with his bugs, led to longer orgasms. His brain immediately started thinking of different ways that he could use this knowledge for his own future sexcapades.
For the entire rest of the flight neither person spoke a single word to each other.