Please tell me that you didn't just all have sex,” gasped Brandy, eyes bouncing back and forth between the two lightly tousled beds.

“Well not all together,” shrugged Pickle. “I mean we were in the same room.” He scoffed at the idea. “That would be crazy, mom. We wouldn't do that.”

“It's crazy either way,” she blurted. “What were you thinking?”

“Well we were just going about our business about to make our next foal and they stepped out of the shower wanting to rut each other and who are we to stop them?”

The Cakes stood stone-faced behind Brandy.

“They were in the shower and you were just going to do it out here?” she lambasted.

Barley exited the bathroom and into the fracas.

“Did you two actually rut?” Mrs. Cake asked her twins in shock.

The Cake Twins exchanged uneasy looks. “Yes,” they admitted in unison.

“Did you give them a fertility potion?” Brandy interjected after noticing the familiar Brown satchel on the nightstand.

Barley frowned. “Uh well… I didn't exactly give them one. I said they could help themselves if they wanted.”

“I'm uncomfortable with the speed at which today is traveling,” declared Mr. Cake.

“I am so sorry about all this.” Brandy facehooved at their recklessness and lack of awareness and judgment. “I know they’re breeder bonded but they just figured this out and their parents still hold responsibility over them. This should have been handled in a discussion between the four of them. Discretion. I can't believe you still haven't learned. This is just like when you started making those movies.” - - -

Pickle flipped to the next page of the script as he tried to decipher his own hoofwriting. His sister studied an identical transcribed copy.

“I have it down,” she mumbled. “I thought you said there was going to be dialogue to learn.”

“Yeah but I chickened out,” he replied without looking up. “We don't usually talk and it just sounds weird to me. It'll be just as good without it.”

“Well if there are no lines to learn and you're ready then I guess we can just start right now.”

“Yeah,” he agreed, putting the paper aside. Barley passed him her copy and he stacked it decidedly out of the shot.

“Okay, so just sit there on the edge of the bed to start out and face the camera.” Pickle went over to the camcorder which sat attached to a tripod near the wall. He flicked it on and centered their bed in the shot. Barley settled into her spot and composed herself sweeping the hair from her face with one hoof.

“Okay, here we go.” Pickle stood to the side out of view of the lens and tapped the little red button to begin the recording. “Twins Two: The Incestining. Take one. Action.”

Barley burst into laughter, “That's not the title.”

“I know. Doesn't matter, just roll with it.”

She quickly straightened out her expression again for the take. Without any lead in Pickle walked into the frame at the foot of the bed and sat down next to his sister. They turned toward one another and launched straight into a passionate, open mouthed kiss. Barley moaned softly as she raised her hoof to grab the back of her brother's head. Their tongues explored each other's mouths. He bit her lip. She stuck out her tongue and he sucked it in lick whipped cream.

Pickle's cock sprouted from his sheath, growing tall and fat right at the center of the frame. The siblings continued kissing and without even looking, Barley reached her free hoof down and began to stroke him slowly from base to tip. Pickle grunted in appreciation and moved his legs apart, allowing his balls to spill down between them. His fully aroused colthood was now on full display for the camera, full to capacity and aching with desire.

Barley pulled away from him with one last smack of their lips and turned her eyes downward. She stretched out on the foot of the bed. Keeping in mind where the lens was pointed and making sure not to obstruct it she brushed her hair back with one hoof, took his cock with the other and plunged his flare into her mouth.

Pickle tilted his head back and sighed in euphoria as his sister's lips glided down his length and all the way to his base. She'd fit all of him down her throat without even a pause. Her skills had improved greatly over the past several months. There arose a fast rhythmic squelch timed with the bobbing of her head. She added a little bit of torque motion to her up and down movements. Her tongue curled against the side of his shaft. She pulled off of him and kissed his tip. Then she began to nibble the edge of his flare making eye contact with the lens. She swirled her tongue around him, playing to the camera as written in the script. Her brother was still drooling with pleasure.

She went back to deepthroating him but soon felt him throb in her mouth, signaling that she probably needed to move on if they wanted to fit in the rest of the script. She pulled off of him again and pushed him backward with one hoof. He toppled onto his back but shifted over a bit to regain the center of the frame for their next act.

Barley stood up straddling her brother in reverse. He looked up between her legs to see her wet pussy and swollen udders hovering above him enticingly. He licked his lips automatically in anticipation devouring one or both but quickly reminded himself that they weren't meant to come his way this time.

Barley dropped to her haunches atop his midsection with her hind legs splayed wide in front of the camera. She slid forward until her slit brushed against his dick. She bent it upward with one hoof and hopped up momentarily to spear herself upon it. Then she settled back down until he was fully stuffed inside her. Her lower lips arched over his veiny girth, crowned by her clit at its apex.

Barley swirled her head around once to throw her main back and out of the way before planting her two hooves down on either side of the action between their legs again remembering not to block the shot. She rolled her hips and her mouth cracked open with a pleasurable smirk. Then she began to bounce on her brother. Their thighs smacked together and pickle groaned. He grabbed her hind legs to help leverage her bounces higher in the somewhat awkward but no less fun position.

Barley's mouth grew wider as her cries intensified she looked directly into the camera as she slammed down on her brother again and again.

The door of their room opened without warning and their mom walked in, not even raising an eyebrow at the spectacle of their entanglement. Typically they wouldn't care at all about her presence either but they both stopped abruptly as she came by the side of the bed and into the edge of the camera frame.

“Oh, don’t mind me. Just got your laundry.” She set down the basket in the corner with a thump. Her eyes fell on the red blinking light of the camcorder. “So that's where the video camera went. Are you… recording a video right now?” Her forehead creased.

“Yeah and you wrecked the take,” grumbled Pickle.

Barley lifted herself off of his slick cock. He got up to go turn off the recording.

“Sorry, I didn't know. I had no idea you were into… watching yourselves.”

“We aren't,” replied Barley.

“The videos aren’t for us,” explained Pickle. “They're for clients.”

Brandy blinked. “Clients?”

“Yeah, we've found some ponies who will pay a lot of money for videos of us rutting or doing other stuff. They specifically want to see twins I guess.”

Brandy's mouth dropped open in horror. “Are you serious?”

“Yeah, we know money is tight right now. We thought it would be a cool surprise for you if we brought in some more with a side job.”

“No!” She shook her head. “Don't do that!”

Pickle shrugged in confusion. “But why not? It's pretty easy. I mean we're basically doing this all the time anyway and they're paying-”

“No! Absolutely not,” she reiterated. “For one, it's illegal. For another, you're being exploited. You have no control or ownership of your… movies once they change hooves. Copies are going to end up on some black market for perverts. I don't even know who you're doing these deals with or what their intentions are. You have to promise not to do this until… you're legal adults I guess.”

“Fine,” they groaned in unison, thinking about all that potential money going down the drain.

Pickle casually reared up to mount his sister, slipping back inside her with ease.

“We're still gonna finish though,” he grunted. - - -

“We never did anything like that again though, even when we became adults,” said Barley.

“Yes but my point was that it was weird. You did a lot of weird things without thinking and you still do.”

“We didn't do anything else weird,” argued Pickle defensively.

Mrs. Cake turned to whisper to her husband. “Telling all these stories is super weird.”

“You definitely did,” retorted their mother emphatically. - - -

Barley was gone on an overnight school trip for her art class. She had taken Tornado with her which was a little worrisome for Brandy but at the same time she trusted Ms. Cheerilee and the other parents to keep an eye out and help her if she needed it. In the meantime it was strange just having Pickle in the house.

With no Barley and no baby it seemed like they should seize the moment to do something fun together. Brandy walked past the twins’ open door. Her plan to announce her presence was stifled when she spotted her son laying on his bed. His muzzle and much of his face were shrouded, covered by a familiar article of clothing, one of Barley's beanies. It was like he was just breathing it in.

Brandy screwed up her face quizzically. Pickle sniffed the used hat, his eyes were closed as he thought about what she could only guess, his sister and her body. She wasn't here to service his ravenous biological needs. His hoof went down to his sheath where it began to massage slowly in a back and forth stroke. It wasn't long before his tip was poking out. Brandy turned away knowing where this was going and not wishing to see anymore. She’d just come back later.

One day pickle had to stay late at his after school job. It wasn't even that late but Barley got bored quickly without him. Brandy brought a load of groceries into the kitchen and called for her daughter who didn't respond. She listened for signs of life but the house sounded empty so she kept bringing in food. She filled the kitchen table with bags from the cart outside and then called again. Still no response. She was sure she was still at the house. Oh, maybe she was sleeping, she thought, she should be quiet.

Brandy wandered into the living room to find Tornado asleep in his playpen and her daughter splayed out on the couch. She clutched one of Pickle's hoodies to her muzzle with one hoof. The other one was busy between her legs flicking her damp clit as fast as it could. A soft moan escaped her lips.

They weren't apart all that often, thought Brandy. So how did they figure out this little trick that they did? Did they come up with it together?

Barley's eyes suddenly flicked open and she looked over at her mother. Then she moved the hoodie aside to speak. “Oh, hey Mom. Did you need help with the groceries?”

“Yes but why don't you just finish up first and help me when you're done.” She turned back to the kitchen. “But wash your hooves first,” she added under her breath.

Brandy woke up from a well deserved nap with the baby. She left him swaddled in his crib and went to find her daughter to remind her to feed him soon. She poked her head inside the twins' room first and saw her two foals in the middle of an intense make out session. Not surprising. Pickle was on top of his sister, pinning her to the mattress while he dominated her mouth with his own. She was about to shut the door and leave them be but stopped abruptly to do a double take. Pickle's mane was so long. Wait, that wasn't Pickle, it was Barley dressed in his red hoodie. Then that meant… She looked down beneath her daughter to see that it was actually Pickle who was pinned to the bed and wearing his sister's beanie on her head.

Brandy froze, mystified at the crack of the door. What were they doing? She'd never seen them do anything like this before.

Barley pulled off of him and slid off the edge of the bed. She reared up between his legs which stuck out over the side. Then she pulled his cock into an upright position against her pussy and began to stroke it with her hoof, rocking herself into it as she did. Her udders squeezed around his girth.

Brandy's eyes widened in amazement as she watched her daughter bend her brother's cock back even further and slip it between her legs. She got it inside her and began to thrust her hips into Pickle almost like they had reversed roles completely.

Barley grabbed his thighs in her hooves and pulled him in close to get him as deep inside her as she could. Despite the awkwardness of the position, her hips moved with the same cadence of a colt fucking a filly on her back.

Pickle moaned as he felt himself quickly approaching climax completely at the direction of his sister. Brandy closed the door silently and trotted away, both astounded and intrigued by the position she'd never considered before. She needed to try that one someday. - - -

You saw that?” blurted Barley in horror.

“Yep,” answered her mother bluntly. “I've seen everything.”

“Even the-”

“Yep.”

Pickle buried his face in his hooves and groaned.

“So this is what it takes to embarrass you.”

There was an awkward silence before Carrot cleared his throat to speak directly to his foals. “Why don't we all go to our room now?”

Author's Note

Fun Fact: 'The Incestining' was the working title of this story.