A promise is a promise (Gravity Falls)
"Ah, Mabel, playing in the woods ag-... ain?"
Wendy knew right away that something was not right. The way the young girl's head snapped up in sudden alarm, the way her relaxed and absentminded expression suddenly transformed into pure terror, her hands clumsily fumbling with her clothes...
The redheaded teen followed the movement of Mabel's hands; how they immediately pulled her panties back up in a panic, after they had been hanging somewhere around her knees. And how... oh.
Wendy froze, just like Mabel, both girls now staring downward - their wide and shocked eyes closely following along, as a wave of dribbling water seeped right through Mabel's panties. Quickly followed by another, stronger wave. And another, the wet spot on her white panties rapidly growing outward with each new spurt escaping her bladder, until the piece of clothing was almost entirely see-through.
With a helpless whimper, Mabel pressed her eyes closed, her shivering body unable to stop the spurts from coming and a wave of guilt struck Wendy.
She hadn't intended to interrupt the girl in the middle of her bathroom break.
And she also didn't know what to do now. How to make it better. Mabel's bladder was already in the process of emptying everything it had. Her panties were already fully drenched - as was the entire front of her skirt. As it turned out, in her hurry to pull her underwear back up, Mabel had accidentally stuffed her skirt into said underwear and now it was being thouroughly washed by her pee.
There was no way the young girl would be able to hide the evidence of her accident, once she and Wendy returned to the Mystery Shack.
"Sorry..." Was all the redhead could offer. She knew it wasn't enough. Not nearly.
Mabel's reaction was interesting to follow.
At first, she gave nothing but a shaky inhale in response, her face slighty flushed and her expression almost blissed out from her relieved bladder. Then, once her mind returned back to reality and she finally noticed the full extent of the damage done to her clothes, she looked mortified. Quickly followed by angry, as she fixed Wendy with a tearful glare.
It was truly rare to see Mabel upset like this.
Wendy had really messed up.
"Sorry." She tried again, eager to appease the young brunette. "I really didn't mean to surprise you like that. Tell you what, I'll make it up to you later, when we're back at the Shack. How about that?"
"How?" Was the girl's only question. It was a valid one. How, indeed?
Wendy didn't have any cash or candy on her, so that option was out of the question. She would just have to offer Mabel a favor, instead. And so she did just that.
Truth be told, Wendy had been expecting something harmless out of it. Perhaps to participate in one of Mabel's tea parties with her plushies. Or to accompany the twins on one of their adventures. Perhaps to help Mabel finally bag a boyfriend, or to maybe have to spend a single date with Dipper, just to appease the brunette.
But when the girl, after mulling it over for a bit, finally made her decision, it was not what Wendy had expected at all.
"You know, it's not fair that I'm the only dirty one. You surprised me and made me pee myself! I... I shouldn't be the only one who pees herself!"
Wendy hung her mouth open in shock. Was... was Mabel suggesting what she thought Mabel was suggesting?
It couldn't be...
"What...?"
"I don't wanna face Dipper and Grunkle Stan alone like this. I don't want them to make fun of me, or... or think less of me. It's not my fault this happened! I don't wanna-... I shouldn't be the only one!" The young girl insisted, in an almost childish fit, shame and fear written all over her face.
Was Mabel really that worried over her family's reaction? That insistent over her favor? Wendy swallowed.
This was so bad. Downright shameful, even. Wendy did not want to do it and she seriously considered trying to weasel her way out of it.
But something stopped her from that. Her own guilt. Mabel's words. The favor she had promised her. The fact that certain humiliation would await the young brunette, the moment she returned home with a wet skirt and dripping panties and had to face her family.
At least sharing that shame with Mabel, taking half of the attention and blame off of her, was only fair, right? After all, like she had said herself, Mabel wouldn't have had that accident in the first place, if it hadn't been for Wendy.
With a heavy sigh, the redhead made a split-second decision, before she could lose her nerves.
She nodded. Then pushed.
Some part of her had been hoping for sudden pee shyness to pop up. For her own bladder to clamp up, to not cooperate with her brain. For Wendy to have a plausible excuse to not have to go through with it.
She felt a crushing, shocking disappointment, when, upon pushing, an immediate warmth spread out in her underwear.
There was probably still a chance to save her pants. To stop her bladder. To just lie to Mabel and invent some pee shyness out of thin air. But the shock over the sudden warmth in her panties made Wendy's brain freeze up - and so her body kept on going, uninterrupted, as if on autopilot.
Warmth washed over her entire panties, from crotch to butt, making the fabric cling to her skin persistently. It audibly dribbled against the inside of her jeans, before running down both her pant legs at once, finally drenching the inside of her shoes. It all felt so... wet. Overwhelmingly wet. Like there was a hot shower running inside her jeans...
Wendy didn't need to look down to guess the extent of the damage she was doing to her clothes. She didn't even want to look down, to acknowledge what was happening.
She was... really peeing herself on purpose...
Wendy's face grew hot in shame.
"You know..." Mabel suddenly spoke up, her voice timid, unsure... perhaps sounding a bit guilty, even, over making Wendy pee herself like that. "Now that I think about it... I could have just jumped into the river nearby. Make all my clothes wet. Tell everyone I fell into the river by mistake..."
Wendy groaned. Of course. A perfect solution to hide her piss-drenched clothes and they both had been too blind to see it, until now.
"...Well, there is still time until my shift starts. We can still visit the river." Wendy offered, eager to follow this idea. Now that her bladder was running dry, leaving her jeans heavily dripping onto the ground, her own clothes were clearly in need of a wash, as well.
Mabel nodded, just as eager to follow this idea. To leave this awkward situation, and her temporary anger at Wendy, completely behind them and to wash the stains off her own clothes.
"Okay. Okay, let's do this."
"Mabel, do you think-"
"Ah-!!"
SPLASH!
For minutes now, the two girls had been standing in the river, naked from the waist down and spending all that time washing their pants, skirt and underwear as thouroughly as possible. It had been a quiet and mindnumbing task - enough so that Wendy's sudden voice had caused Mabel, who had been completely lost in thoughts, to flinch and immediately lose her footing.
Wendy cringed, when she saw Mabel fall backwards into the water.
She cringed even harder, when, after a moment, she saw Mabel finally emerge out of the water... completely empty-handed.
One look over both their shoulders showed the girls Mabel's skirt and panties - now floating down the river and out of sight.
Mabel let out a high-pitched noise of distress, at the same time that Wendy groaned in frustration and rubbed the bridge of her nose.
What favor would she owe Mabel for this, she wondered bleakly.