It was a mild winter day. Rainbow Dash and Sunset Shimmer were skiing together. They were wearing their winter outfits, with Rainbow wearing her skintight black pants underneath, and Sunset wearing jeans underneath.

After skiing down a massive slope, Rainbow and Sunset sat down in the snow to rest for a bit.

"That was awesome!" said Rainbow Dash. "When we get back up, let's go down that hill again!"

"That sounds fun," said Sunset. But at this moment, she felt an all too familiar sensation: She had to go to the bathroom. There was a bathroom relatively close by. But this reminded Sunset of something that she had been itching to know.

"Rainbow Dash, remember that snowball fight where you were inside a snowman for two days to get a sneak attack?"

"The sneak attack that didn't work?" Rainbow said indignantly.

"Well, it might have worked if you didn't loudly shout 'Sneak attack!' before throwing the snowball.

"Point taken."

"I've been thinking. Two days is a long time to go without a bathroom. Did you... um... pee in your snowpants?"

"You bet I did," said Rainbow unabashedly. "Do you think I'd cancel my awesome sneak attack for a bathroom break? And with all the coffee and energy drinks I drank to stay awake, I peed more than once." She chuckled.

"So... you were willing to pee in your snowpants just to get a sneak attack?" Sunset had never heard of anyone willingly wetting themselves before.

"Well... There's kind of more to it than that. You'll probably think I'm weird, and I've only ever told Fluttershy."

"Now I'm curious. What more is there to it?" Sunset felt her need to pee increase a bit, and fidgeted slightly.

"It wasn't my first time. Far from it. For years, whenever I'd be having fun playing in the snow, doing winter sports, or hanging out with you at a snow fort or something like that, whenever I have to pee, I just go in my snowpants."

"You wet your snowpants all the time? Why?"

"I'm having so much fun outside, and I don't want to take the time to go inside and remove multiple layers of clothing. The last time I did that, I felt it was a major inconvenience. So, far more easier to just pee my snowpants and be done with it."

"But your snowpants always looked dry every winter."

"They only get wet on the inside. They don't show wetness on the outside. And you never saw me take them off so you didn't see how wet my pants were underneath. So not only is it convenient, but no one can even tell. Like I said, I told Fluttershy, and she thinks it's kind of cute."

The talk of wetness made Sunset's need to pee grow more, but she was very intrigued by Rainbow's story. "Do you know of anyone else who wets their snowpants for convenience?"

"Not in person," said Rainbow. "Maybe Pinkie Pie, I've seen her a little fidgety at the beginning of some winter outdoors and then heard her sigh in relief, and I could've sworn I saw some steam coming off her snowpants, which is what happens when you pee outside. But she almost doesn't count."

Sunset had to agree there. Pinkie did all kinds of weird things and the girls had learned to just go with this without giving it too much thought. Given what Rainbow said, it was most likely that Pinkie also wet her snowpants on a regular basis. She did wet the bed sometimes, after all, and laugh about it, and Sunset had dismissed it as her just being Pinkie Pie.

"But," continued Rainbow, "I got curious so I looked it up online and it sounds like there are lots of people in the world who wet their snowpants for convenience. And they also like how it's easy to hide."

"I had no idea this was actually a thing. It sounds very interesting. Is it... unpleasant?"

Rainbow blushed lightly but smiled. "Kinda the opposite. After doing this for years, it's hard to ignore how good the warm release feels. Maybe it's cause I don't mind getting wet, but the warm wetness spreading through my snowpants... You won't know unless you've done it."

"I'm thinking about it," said Sunset. "I have to go right now." Badly, in fact.

"So, why not go in your snowpants?"

"I'm really curious now about how it feels, if it's that good. Can we... go together?"

"That would be a little difficult," said Rainbow. "I already went when we were skiing down the hill." She chuckled.

"Oh. Well, if you're already wet..." Sunset tried to pee, but was having a bit of difficulty.

"It can be hard the first time since your body is trained to not pee in your pants," said Rainbow.

"Funny how that works because when I first came here from Equestria, I didn't realize I was wearing panties the first time I went to the bathroom." She strongly suspected that Princess Twilight had had the same mishap on her first trip to this world. "At the time all I could think was how embarrassing it was and hoping no one would notice, and not how it actually felt."

"Just think of how it will feel," said Rainbow. "The warm release, the wetness spreading through your snowpants, how warm and wet it will be, and if all else fails, think of the sound of your stream splashing into the toilet."

Sunset had to pee so badly that it actually didn't take long to convince her bladder to let go. Sunset began peeing her snowpants, feeling the warm wetness soak her rear end and spread through the inside her her snowpants. She blushed, feeling a bit foolish at deliberately wetting herself, but she couldn't deny that it felt very good. The relief, the warmth, even a bit of excitement at doing something "naughty" without anyone knowing, except Rainbow Dash, who was sitting beside her in equally wet snowpants, and not for the first time.

As she peed, a hissing noise could be heard, and steam came off of her snowpants. Sunset blushed a little more, but also felt a bit of excitement at this.

Eventually, she finished wetting her snowpants and sighed of relief. "That's better." Her jeans and snowpants were very wet, never mind her black boyshort panties, but she didn't really mind this either. Quite the opposite, actually. She remembered that time she was in the rain in her Backstage Pass pants, and decided that for her next snowpants wetting, she would wear those underneath.

"Did you enjoy your first snowpants wetting?" Rainbow asked with a smile.

"Yes," said Sunset. "I just wish I'd thought of this sooner. All the times I ran to the bathroom and spent so much time removing my snowpants and my jeans... One of them was a near miss, too. If I had known how amazing this felt..."

"Yeah, it's the best," said Rainbow. "So, you're gonna do it again in the future?"

"All the time," said Sunset. "I mean, of course, my jeans are wet now too, but I can always change when I get home."

"Sometimes I don't change when I get home," said Rainbow with a mischievous smile. "Of course I do always wash up and put on a clean pair of pants for the next day. I know Rarity doesn't like it when I smell too unpleasant. I still remember that time she gave me a bath in my stinky shorts after not washing for days." She chuckled a bit, finding it funny to look back to.

"That reminds me. Have you ever messed in your snowpants?"

"Once, inside the snowman."

"And was that enjoyable too?"

"It was kind of fun at the time, but the cleanup was pretty annoying. You can try it if you want, but just keep that in mind."

"Maybe I will. Not now though, I don't have to go in that way."

"So, wanna go skiing some more?"

"Sure."

Sunset and Rainbow stood up, made their way up a hill, and began skiing down the slope in their wet snowpants, which, while very soggy on the inside, showed no wetness on the outside.

Author's Note

Actually, in regards to a note in the long description, you'll see I did add Sunset planning to wet her Backstage Pass pants. And I say she will definitely go through with it.