"Great!" Pinkie hopped up and down, and her dick and boobs bounced everywhichway. "Let's get going!"

"So, uh, what are we doing first?"

"Fucking!"

"Alright then..." Rainbow Dash swallowed. She had expected Pinkie to request at least a bit of foreplay first. Then again, she had no reason to expect that. Pinkie wasn't very good about delayed gratification. "I guess I better get naked."

"Yep!" Pinkie watched intently as Rainbow Dash peeled off her clothes. She giggled. Even though Rainbow Dash was totally naked, her tan lines were so obvious it looked like she was still wearing a set of see through bra and panties. The only real color there was the pinkness of her nipples, and colorful patch of below-deck hair that was trimmed, appropriately enough, into a landing strip. She reached out and planted her hands on Rainbow Dash's breasts, which were just big enough to qualify as actually being there. Every part of her petite body was so toned.

"So...uh... how are we doing this?"

"You don't know how it works!?" Pinkie's eyes bulged. "You're missing out! All I have to do is stick my dick in your--"

"I know how sex works!" Rainbow Dash grabbed Pinkie's hand as pulled them off of her chest. "I was asking about what position you wanted to use. Should I bend over, or what?"

"Oh." Pinkie sat on the edge of her bed. "Hop on!"

"O-okay. Let's see, how should I do this...?" Dash slowly climbed onto the bed, trying to figure out the best way to lower herself onto Pinkie's cock. She put her hands on Pinkie's shoulders and swung one leg over her. "Okay, Pinkie, I'm coming down."

Pinkie grinned as she lined yup her cock with Rainbow's crotch. "This is gonna be awesome!"

"Yeah, I sure hope-" She inhaled sharply as the tip of Pinkie's dick slid into her vagina. She looked down, and could hardly believe what she was looking at. Pinkie watched intently as the shaft of her penis disappeared into Rainbow Dash.

"Your pussy feels so amazing!" Pinkie put her hands on Rainbow's hips and gave her a shake. "It's warm and tight and wet and feels like it's squeezing my dick and it feels really good!"

"Y-yeah..." Rainbow Dash wrapped her legs around Pinkie. Each time Pinkie so much as twitched, the thrill that ran through her curled her toes. "Your dick feels pretty good, too."

"It's not too big, is it?"

"No, it fits right in."

"Great!" Pinkie began to wriggle her hips, sliding herself further onto the bed. Rainbow Dash gasped as Pinkie's dick stirred around inside her. "You comfortable, Rainbow Dash?"

"Yeah..."

"Let's get going, then!" Pinkie began to thrust, her entire body bouncing as she shoved her dick into Rainbow's pussy.

"AH!" Rainbow Dash felt herself lift into the air with each thrust, only to be slammed back down onto Pinkie's dick. Her entire body shook as her thighs smacked against Pinkie's. It was glorious. "Harder! Harder, Pinkie!"

"Sure thing!" Pinkie thrust harder, nearly lifting herself off the bed. She threw her arms around Rainbow Dash and pulled their bodies together.

"Pinkie, what are you- MMMMPPHH!"

Pinkie's tongue interrupted her as she kissed her. Rainbow Dash gasped as she found Pinkie's tongue writhing around inside her mouth. She could taste it. Sweet; of course. No surprise there. She pressed her tongue against Pinkie's and began to suck on it. Pinkie tried to giggle, but couldn't. Rainbow Dash embraced Pinkie and squeezed. Pinkie's breasts were so big it felt like there was a pillow between them. They were pressed so tightly against Rainbow Dash that they couldn't even bounce despite the furiousness with which the two of them were bouncing.

The two of them released the kiss, gasping for breath. Pinkie leaned back. Rainbow Dash slowly withdrew her legs from around Pinkie, slowly shifting so her knees rested on the bed. Pinkie flopped back on the bed, Rainbow Dash riding her as she bounced. Pinkie clutched at the sheets and bit her lip. Rainbow Dash smiled. Pinkie could barely keep her eyes open; her eyeballs were starting to roll into her head, lost in coitus.

"Come on, Dash!" She gasped, barely coherent. "Do something!"

Rainbow Dash looked down at Pinkie. Her boobs were jiggling beautifully. Dash reached down and grabbed them. Her fingers sank into Pinkie's chest, soaking up the softness and warmth. She squeezed, and felt Pinkie's nipples getting harder against her palms. She began to move her hips, compounding Pinkie's thrusting with her own. She could feel Pinkie's cock pulsing against the inside of her vagina.

They were bouncing so hard that the bed was nearly leaving the floor. It squawked as it slid over the floorboards, moving a fraction of an inch with each shake. Rainbow Dash began to shiver. The entire world was shaking, and was about to explode.

She closed her eyes.

"What in tarnation is goin' on up there?" Applejack nodded her head at the ceiling, from which was coming a loud thumping.

"It's Pinkie Pie, dear," Mrs. Cake answered. "She and Rainbow Dash are up to... something."

"Really? I wouldn't trust those two up there. Probably settin' up some sorta prank or somethin'."

"Maybe, but I don't think so."

Applejack shrugged. "Suit yourself. If they break somethin' feel free to give me a call."

"I'll keep that in mind." Mrs. Cake chuckled and looked back over her shoulder. "Dear, where are the biscuits that the Apple family ordered? Are they back there?"

"Yes, I'll bring them right out!" Mr. Cake stumbled out of the storage room, bearing a surprisingly large box. He dumped it on the counter. "Could you ring these up? One of the babies needs a diaper change."

"Are you sure you're okay with that?" Applejack pointed to the ceiling. The thumping had gotten louder. "They're probably gonna-" There was an incredible crash from above, then silence. "Somethin' like that. I'm gonna go check that they're okay!"

She rushed up the stairs.

Mrs. Cake shouted after her. "Make sure you knock first!"

Author's Note

Even if they weren't bumping uglies, RD and Pinkie would still be up to no good.