What happens during Brother's Day...
Sometimes you really don't know what you get yourself into. That’s what Shining Armor was thinking after his sister Twilight Sparkle had invited him to an event that was suppose to be a picnic in woods for the old times sake. However, such occasion was actually an excuse for a sex party: he and some other stallion, Big Macintosh, were actually supposed to have sex with each others sisters, pretending they were de facto doing it with their own little sisters!
Not that he was complaining, though. As he was a little reluctant at first, he finally gave in, and all his troubles melted away, quite literally, when he ejaculated gallons of his virile semen after a long oral session with Big Macintosh’s sister Applejack.
And before he knew it, Applejack had aimed his erupting member towards Twilight’s face, making him involuntarily commit incest! But for some reason he didn’t care. He knew he had some explaining to do for his loving wife, Princess Cadence, but luckily their marriage was pretty open: instead of being concerned of Shining cheating on her, she would get upset for not being invited to watch!
"Who's ready for round two?" Applejack said to her partners after their session was done.
"Seconds?" Shining asked Applejack as he was gasping for air, "Sheesh, gimme a second, would you?"
Applejack smirked at his messy face that had gotten sticky by her juices, having just rubbed her pussy against his snout.
"Come on Big Mac," Applejack said, turning her attention to her brother, "you ready for some more action?"
"Eeyup!" he said. He nodded yes but it seemed that ole' Little Mac was still taking a break. It had been only a couple of minutes since he had shot his load into Twilight’s mouth after one of the best blowjobs he had ever received!
"Well let's see, if we can't get you going again," she said, looking at the mess Shining was wearing behind her. She had so many ideas inside her head, waiting to be come out.
But whatever it was, she had to put them aside for a moment, as Shining rose up from his spot and started trotting towards the nearby tree.
”Oh, where are you going, Shining?” Twilight asked curiously, worried if Shining had gotten enough of their picnic.
”Gotta spring a leak, Twily!” Shining replied, ”Be right back!”
”Mmm, okay… Wait, W-WHAT?!! Twilight noticed Shining was straightening himself by a tree only a couple of feet away from them, where they could clearly see him, ”Y-you’re going to do it next to us?!!”
”Oh, ya gonna show off your sausage again?” Applejack smirked and took a better position, ”This ah gotta see!”
”Hey, you both have already seen my cock," Shining replied calmly, ”I have nothing to hide anymore!”
”Y-yes, I suppose…” Twilight looked down as she blushed, ”But it’s just… It’s not normal!”
”Twilight, we already sucked their cocks while they watched!” Applejack rolled her eyes, ”Ya think that’s kinda normal?”
”Oh, right!” Twilight grinned nervously, ”I guess we have already broken some rules here…”
”Just sit back and enjoy, Twi!” Applejack reassured, ”You ain’t gonna see something like this very often!”
Big Mac turned his head away at the same time as Shining let his horsecock drop out of his sheath. Even in its flaccid state it was quite a marvel: it was as thick as Twilight’s hoof and its throbbing shaft was bulging with veins, big enough for somepony to land a helicopter on it!
Shining was leaning against the tree with his other hoof while he started aiming himself with the other one, and soon let out a stream of clear liquid that arced down on the base of the tree.
”Aawright, work on it, sugarcube!” Applejack said in excitement and leaned closer to the action. Twilight on the other hoof tried to look away as she blushed profusely, she felt uncomfortable watching her brother doing something so disgusting in front of her. She wringed her nose as she smelled it.
Not that she had ever seen Shining doing that, though. Ever so often she had entered the bathroom carelessly, accidentally walking in on him while he stood to urinate into the toilet, something which she wasn’t so proud of. She was very aware of the pony biology, having been read about it many times, but she didn’t care to see something like it with her eyes.
It wasn’t that she didn’t enjoy seeing her brother’s penis on some occasions, as she had fantasized about it many time while masturbating, it just wasn’t the context she wasn’t keen of - she associated urinating with dirtiness like many other unicorns did.
Shining groaned loudly as he kept going, the amount of his piss growing in volume, his meatspear twiching in his grasp. He had created a small waterfall cascading down the tree and it was starting to form a puddle dangerously close his hooves. He started waving his dick from side to side as if he was marking the tree as his own.
”Damn, boy! That’s a lot of pee!” Applejack saw getting wet as kept staring. Her fleshy pearl of clitoris was poking out of her folds as her lips swelled, getting ready for some action. ”Ya could start a fire department and put out forest fires with that!”
”Well, I do have a hose for that!” Shining winked back at her, while Twilight squirmed in embarrasment. How could his brother be so casual about any of this?
”H-how can you enjoy this, Applejack?” she asked in confusion, ”Peeing is so gross!”
”Hey, when ya live your whole life in a farm, you can’t avoid seein’ somethin’ like that!” Applejack replied and smirked, ”Me and Big Mac take potty breaks in the woods all the time! When somepony pees while you’re around, it’s just a sign of affection!”
She turned her head towards Big Mac, ”Sometimes Mac just turns his back away from me and starts hosing the ground!”
”What?!!” Twilight yelped in shock as Big Mac blushed nervously.
”Ah… Ah thought you weren’t watching!” Mac stammered, Applejack smirking at his reply.
”Hey, we’re Apples, remember!” she cracked, ”We ain’t closet pervs, we do it as openly as it gets!”
”Well, that explains everything…” Twilight mumbled and looked at his brother, ”Are you done yet?”
Applejack followed suit, turning her head back to the show where Shining’s stream was slowing down to a trickle. He sighed in relief and gave his precious member a couple of hard shakes to get the last drops off, making Twilight’s eyes go wide.
”Atta boy! Shake it for momma!” AJ hollered while giving jerking motions with her hoof. Even Big Mac glanced curiously towards Shining's direction as if checking if his flopping thing was bigger than his.
”Ok, that was something I didn’t need to see…” Twilight looked away awkwardly, as Shining finished and kicked off the tree, his member twitching on its own as it retracted into his barrel.
”Whew, that felt good!” He sighed in relief, turning towards others, ”Sorry about that, guys! My bladder always gets filled up during sex!”
”None taken, sugarcube!” AJ replied and winked at Twilight, ”Your sis here enjoyed that a lot, ya know!”
”Wha- NO! I-I DIDN’T!” Twilight protested and blushed, while Applejack laughed her head off. She was starting to lose her mood if this went on!
”Yeah, sure!” She chuckled and turned towards Mac, wanting to get going what they had started, ”Ah reckon’ you still want what Twilight here was havin’?”
”Eee-nnnope!” Big Mac replied, thinking Applejack was referring to urine. He might have enjoyed watching his sister pee, but by Celestia, he didn’t want to get involved in pee drinking!
”Mah pussy juice, that is!” AJ added, rolling her eyes at Mac.
”Oh… Eeyup!”
”Good!” AJ rose up on the blanket, ”Let’s get started then!”
-THE END-
Author's Note
Sorry Shakespearicles, hope you still enjoyed this... 
Extra Chapter: Applejack Joins The Fun (And Twilight's Not Amused!)
"Well, that was uncalled for..." Twilight rolled her eyes as Shining had returned to his patch of the blanket. Her loins were aching, eager for some real action with the stallions, not just watching one of them shaking his junk. "Okay then. Maybe NOW we could get on with our picnic?"
"Hold your horses, sugarcube!" Applejack said suddenly "There's one thing Ah need to do first!"
"What now, Applejack?" Twilight asked in frustration, immediately getting worried as she realized what was going to happen,"D-don't tell me you're going to..."
"Eeeyup!" AJ trotted past Twilight to the same tree which Shining had already watered, "Watchin' your brother pee really made me wanna pee too. Ah've been holdin' it for a while!"
She positioned herself just over the tree's roots, right above the foamy puddle of piss Shining had created only a couple of minutes earlier. She raised her tail high, presenting her marehood at her brother's direction, making his eyes go wide, and before Twilight could stop her, she squatted down with an arc of piss spurting out of her folds.
"Aaaaaaaah!!" She sighed happily as her golden stream grew in volume and pressure, hissing loudly against the ground below. Her lips were parted by the pressure, making her flash her pink insides at her friend and the boys.
Twilight and Shining looked away in disgust and modesty, but Big Mac couldn't help but stare at his sister's gushing pussy as she was watering the ground like a power-washer. His "Little Mac" had fully woken up from its slumber, standing up like it was trying to pierce the very sky. He had never imagined watching a mare, specially his little sister of all ponies, urinating in front of him could be that erotic!
As Applejack's piss-spray was faltering, she turned her head to check on her brother's reaction - and of course, his ERECTION - noticing his cock towering in it's full flared and throbbing glory!
"See somethin' ya like, Big Bro?" AJ asked teasingly, swaying her hips a little to make her piss flow from side to side.
"Eeeeyup..." Mac replied in awe, his cock twitching as he was enjoying the show, making AJ smirk.
"Atta boy! Stare as much as you like..." She squeezed the last squirts of her piss out with a couple of winks from her priced clit and then shook her rump for a moment to get the last drops off her snatch. Big Mac swallowed hard as he watched AJ's hypnotic swaying, a drop of pre gleaming on the tip of his cock.
"Aaah, that felt good!" AJ sighed as she wiped her pussy with her hoof, "That cider really did its stuff!"
"C-could we just... Stop doing this already?!!" Twilight pleaded as Applejack walked towards her, noticing how the big puddle under the tree had started flowing down the slope, dangerously close to the blanket they were sitting.
"Say what, we've already seen each other's cocks and pussies!" Applejack replied calmly, putting her wiping hoof on Twilight's shoulder, much to her horror, "Ah guess you fancy town ponies really haven't seen that side of life!"
"Well, unlike you farm ponies... We do have standards!" Twilight snapped, brushing AJ's hoof away, "Can we just get to the round two, already?"
"Sure thing, Sugarcube!" Applejack chirped and then looked at Twilight teasingly, "Ya sure ya don't need to tinkle too?"
"NO!!!"
-The End-
Author's Note
I was asked to do another chapter with the roles reversed. 
That's all folks, for real!
