Author's Notes:

This chapter will try something I've never tried before, for some reason I really like the idea of this with Smolder over anyone else, even Rainbow Dash.

Also, I know in real life white fabric turns transparent when wet, but as this doesn't seem to happen with Fluttershy in Monday Blues, I'll say that simply doesn't apply here either.

Silverstream was so excited as she walked to Smolder's house. It had been several days since their last night together. They'd had fun with their other friends, but she couldn't wait for the kinky fun she and Smolder would have tonight!

She reached the door to Smolder's house and knocked on the door. Almost immediately, it opened.

"Wow!" said Silverstream.

Smolder was wearing her usual shirt, but instead of her shorts or jeans, she was wearing a tight-fitting white pair of men's briefs. Smolder pulled Silverstream in and closed the door before anyone else could see her.

"Like my choice of outfit for tonight?" said Smolder.

"I love it!" said Silverstream. "It makes you even sexier than the pink underwear!"

"Thanks. I've always wanted to try men's underwear. Does it make my butt look big?" She turned around.

"Your butt always looks big," Silverstream chuckled.

"Wanna make sure?" said Smolder, getting down on all fours.

Silverstream got up close to Smolder's rear end. She put her hand on it and sniffed. Her butt smelled bad. Or perhaps it was her underwear. "I like the smell, but are you..."

"Nah, I just wore these for the past three days, including at my games and when going for a run. I'm still showering. I thought you'd appreciate the smell."

"Do I!" said Silverstream. Smolder's underwear was dry, but she could tell she had sweated in them a lot before today.

BBBBRRRRRRRRRRT!

Smolder farted loudly. Silverstream giggled and slapped Smolder's butt, before caressing it with her hands.

"I drank five big bottles of soda just before you got here," said Smolder. "And two of them had fart powder in it, so I'll be really gassy in the next hour."

Silverstream squealed.

They sat on the couch and started watching football. Throughout the game, Smolder let out several loud, boisterous farts.

"Careful you don't stain your underwear," said Silverstream.

"Are you saying I'd soil myself?" said Smolder. "Over my knee!"

Silverstream giggled as she got over Smolder's knee, and Smolder spanked her five times. She farted again before releasing her.

About fifteen minutes later, Smolder said "Here comes a big one." She closed her eyes tight and grunted.

PPPPPPPPPPBRRRAAAAAAAAP!

"Uh-oh," said Smolder.

"You didn't soil yourself, did you?"

"No, but I think I peed a little."

Silverstream took a good look at Smolder's crotch. Her underwear had a small yellow spot on it.

"It's all right. It's just a little bit, it won't ruin the big wetting I have planned. Speaking of which, put your hands behind your back."

Smolder did as she was told, and Silverstream grabbed a thin rope and tied Smolder's hands.

"If you have to use the bathroom, let me know."

As the soccer game progressed, Smolder's farting subsided, but as it did, her need to pee increased. She couldn't even hold herself because her hands were tied behind her back. She liked the feeling of this.

Eventually, she was really fidgeting.

"Everything all right?" said Silverstream.

"Can you untie me?" said Smolder. "I really need to pee!"

Silverstream grabbed a dry scrubbing brush. Smolder's heart started to beat faster. Silverstream stood to Smolder's right side, lifted up her right foot with her left hand, and started brushing it with her right hand.

Smolder burst into a fit of laughter, and only a few seconds later, she was bursting in another way. Her white underwear yellowed quickly as she peed like a race horse. She kicked her left foot in the air repeatedly, but Silverstream knew where to stand so she was clear of it.

Silverstream waited until ten seconds after Smolder finished peeing before she stopped tickling. Smolder was breathing heavily, having greatly enjoyed this. She didn't know which she liked more - the tickling, or the feeling of wetting herself uncontrollably from laughing too hard.

"Wow, you really needed to go," said Silverstream.

"I peed all over the couch. I've been a bad girl." Smolder put herself over Silverstream's lap. Silverstream rubbed Smolder's butt, patting it lightly. It was wet, smelled of urine, and her underwear was stained yellow.

"I deserve a harder spanking than that," said Smolder.

Silverstream slapped Smolder's butt. Smolder kicked her legs, but couldn't hide on her face how much she was enjoying being spanked in her wet underwear.

After ten swats, Silverstream untied Smolder and they resumed watching football. Smolder drank more soda and gave a glass to Silverstream. Both their sodas had fart powder in them. First Smolder let out a sputtering wet fart in her soiled underwear. Silverstream laughed, and released a loud fart of her own.

After farting for about half an hour, Smolder eventually cooked some beans for dinner. Silverstream stared at her butt whenever she was at the counter. It looked so sexy in her damp, pee-stained underwear.

They ate their beans, and had another farting contest soon after. Near the end, Silverstream needed to pee, but of course she didn't want to leave the farting contest, and ended up peeing herself laughing at one of Smolder's loudest farts. Smolder won, as usual.

Then they sat on the couch and watched an episode of Dragon Knights of Everfree, and then a Daring Do movie. Halfway through the movie, Smolder really needed to pee, so she just let it all out in her underwear.

Eventually, once they'd had their fun, it was time for bed. They brushed their teeth and were about to climb into bed when Smolder let out a dirty wet fart.

"Silverstream, check to see if I soiled myself." Smolder turned around.

Silverstream looked at her butt. "Nothing but pee stains."

"Are you absolutely sure?"

Taking the hint, Silverstream put both her hands on Smolder's butt, which was still damp. She felt every inch of it three times. "No mess."

"Good."

"I like your new underwear, but you'll still wear your shorts for some nights, right?"

"Of course. Wait, we didn't go to the bathroom. We did drink a lot just now. Do you want the bathroom first?"

"No, I'll just wet the bed." Silverstream giggled and climbed into the bed in her wet jean shorts.

"I really need to go, and that'll keep me awake." Smolder walked into the bathroom, not closing the door. She sat on the toilet with her underwear up and peed. "Ahhhhhhh..."