Author's Notes:

I couldn't resist another chapter that put Sunset in pony position this time, seeing as how she was originally a pony. Sorry if the quality's lower.

Sunset was really excited as she was on her way to Pinkie's house for another session. As much pleasure as Sunset had gotten out of riding Pinkie like a pony, she wanted Pinkie to ride her now. She knew she was a pony and that it was not unusual for others to ride her, but she was used to being a human and seeing humans ride horses. Furthermore, she enjoyed riding Pinkie Pie like a pony, and could tell how much Pinkie enjoyed her part of it. After their latest pony play a few days ago, Sunset had gotten curious and asked that she be the pony next time. She worried that Pinkie would be disappointed, but Pinkie was excited to try something new.

Sunset was wearing a black tank top and a short, tight pair of jean shorts today, not unlike Pinkie's.

She knocked on the door, and Pinkie answered immediately, wearing her usual summer outfit for their sessions.

"Hi Sunny! Ready to have some fun!"

"You bet."

They first ate one can of beans each, and drank a lot of soda from Pinkie's massive stash. Sunset drank four cans of soda and two glasses of water, and Pinkie drank ten cans, spilling a little down her front.

"Now, time to go for a pony ride!" said Pinkie.

They walked outside, and Sunset got down on all fours. Pinkie hopped on her back. "Giddy up, Sunny!" Pinkie slapped Sunset's butt.

Sunset started to walk on all fours, and Pinkie enjoyed the ride.

"Remember," Sunset said quietly to Pinkie. "No matter how badly I have to go, don't let me unless I say 'Cherry Changa.'"

"Okey dokey lokey!" said Pinkie cheerfully.

They walked through the park. Anyone who saw them was only slightly surprised that they had switched places this time, as if it was Opposites Day.

Then, as they were walking into the trees, Sunset let out a loud fart.

FFFFFFRRRRRRT!

Pinkie laughed, and Sunset giggled a little. Then Pinkie lifted her leg.

PPPPPPPPFFFFFFFT!

Sunset enjoyed the vibration of Pinkie's fart against her back. Pinkie slapped Sunset's butt and she resumed walking. They let out several wet farts along the way, much to their amusement.

Then Sunset let out a longer, deep-pitched fart that felt nastier than any of her farts today.

BBBBBBBRRRRRRRRRRRRRRRT!

"Did I just soil my shorts?" said Sunset.

Pinkie felt Sunset's butt. "Nope! All good!" She slapped Sunset's rear again.

Not long after their farting subsided, Sunset felt an urge to pee. "I have to go to the bathroom," she said.

"Just hold it!" said Pinkie. "Ooh... But now that you mention it, I gotta go pee, too!"

Pinkie fidgeted on Sunset's back, but although she wasn't crossing her legs, there was more pressure on Sunset from Pinkie's weight on her back, combined with her fidgeting, which Sunset really enjoyed. She wasn't sure which of them would burst first. Which would be the first part of her to get soaked - her shorts or her back? She anticipated Pinkie peeing all over her, but as her need to pee rapidly increased, she wasn't sure she could outlast her.

"Ooh," said Sunset, stopping and crossing her legs. "Can we stop, please? I REALLY have to go!" She squirmed a little.

"No! Hold it for the rest of the ride!" Pinkie giggled, playing her part slightly unconvincingly, and slapped Sunset's butt. Sunset leaked a little, dampening her shorts, but she uncrossed her legs and continued walking.

Only a minute later, Pinkie said "Stop! Now! I'm about to burst!"

"You said it yourself, hold it for the rest of the ride." Sunset kept walking, and Pinkie giggled, enjoying her desperation.

The pressure in Sunset's bladder grew, and she could feel pee sloshing inside her as she walked. Pinkie fidgeted harder, but had an easier time holding it in than Sunset did.

Finally, Sunset lost control. Her overflowing bladder gave out, and a powerful stream burst out of her, soaking the crotch of her shorts in seconds. She stopped walking as the pee trickled down her legs in thick torrents and onto the grass below. She sighed in relief, enjoying the warm release.

"I didn't tell you to stop moving! Get me to a bathroom NOW!" Pinkie slapped Sunset's tush.

Sunset started to walk again, still peeing. Pinkie could hear the hissing sound easily and it made her leak a little, but she just managed to hold back the flood. She wanted Sunset to enjoy wetting her shorts before she soaked her.

After two minutes, Sunset finished peeing. Her shorts were drenched, as were her legs, and they smelled strongly of pee, but she liked it. She could understand why Pinkie always took so much pleasure in this. She let out another sigh of relief and satisfaction as she continued to walk.

Then, feeling playful, she bumped Pinkie upwards a bit with her back.

Pinkie whimpered as she leaked again, dampening her shorts even more. "Sunny, quit it! I really have to go!" She didn't cross her legs but continued to sit with a pained expression on her face.

Sunset bumped Pinkie again. "Sorry Pinkie, this is a bumpy ride!"

Pinkie leaked for a few seconds, and then, started to pee full force. She stopped squirming and sighed in relief as her shorts grew very warm and very wet.

Sunset felt Pinkie's rear end become soaked, and soon after, the pee started to flow all over her back, soaking her shirt. She stopped where she was and closed her eyes, enjoying the warm feeling, and the naughtiness of her rider peeing on her.

Pinkie slapped Sunset's behind, and she continued to walk, while Pinkie kept peeing, her giggling nearly drowning out the sound of pee spraying denim.

She peed for about two and a half minutes, and sighed, feeling immensely relieved and having taken great pleasure in wetting herself.

"Wow, you really needed to go," said Sunset. Her head was the only dry part of her now.

Pinkie giggled again. "How did you like that?"

"I loved it."

"Good, cause you have to stay like that for another hour!"

Sunset was a little shocked, but knew she'd enjoy this.

They stopped at a park vending machine to grab some water, took a drink, and continued their ride in their wet state. Occasionally Sunset would stop just so Pinkie would slap her butt again. They farted a few times as well, and their farts were wetter than before.

About 45 minutes in, they needed to pee again. Pinkie let it all out in her shorts, and as soon as Sunset felt the pee re-wetting her damp back, she peed her shorts again as well. She farted in the middle of this, and laughed along with Pinkie.