It was a regular Sunday morning in Canterlot. Twilight Sparkle was brushing her mane in the bathroom at her parent’s place she was visiting with Spike. She had woken up early and didn’t need to rush, so she was taking her time. She had a nice bath and was preparing herself for the day.
Spike was still sleeping in his basket, having no care in the world. Twilight’s parents were downstairs preparing the breakfast.
It was as peaceful a morning as they'd ever be.
Shining Armor on the other hoof was still sleeping in his room, having had a rough night earlier. He had off-duty from his work as a captain of the royal guards and decided to visit his parents for a weekend. He had called his old high school friends over and they had been drinking, reminiscing their past times and playing Orcs & Oubliettes like they did as teens.
Spike had also gotten part of their game, but after he left to go to sleep, they had decided to go to a night club and their drinking got out of hoof. After that Shining had staggered home, hoping nopony would see his drunken appearance and sneaked upstairs to his room, not wanting to wake anyone.
He was now sleeping his drunkenness away, but he was finally starting to wake up.
Sound of the dishes clattering downstairs pierced Shining’s ears and he shot his eyes open, not having a clue where he was. His head was hurting and his whole body ached from rising up. He held his head and tried to put pieces together in his mind.
”I… I was having friends over… And we went to the Flaming Crow's… And then we took those tequila shots… and then…”
Shining felt a sudden ache in his bladder. It was completely full and needed an immediate release. ”Ah! Gotta pee!”
Shining jumped out of bed and rushed through the door. He felt like he was bursting, needing to go to the nearest bathroom. He grabbed the handle and threw the door open, as it wasn’t locked. He didn’t see that the bathroom was already occupied as it was an emergency.
He didn’t even care, he needed to go NOW!
Twilight was surprised when she heard his brother enter the bathroom. She had forgotten to lock the door, which was a saving grace for Shining. She stopped on her tracks and turned her head to look at the door which Shining closed behind himself.
"Oh, Shining!” she said to her brother. ”You’re awake-”
Shining stumbled close to her in a hurry and pushed her into the empty bathtub next to them.
"MOVE ASIDE!" He commanded as he raised the toilet seat up.
Twilight fell into the bathtub and was dumbfounded. Shining definitely didn’t need to be that harsh. She climbed on the edge of the tub looking pretty annoyed and snarled: ”Hey! What’s the big-! Big… Big…!”
Twilight’s mouth slipped open as she saw the view in front of her: Shining’s obsidian and a quite sought-after penis was emerging from his sheath, growing into a veiny sausage that resembled a trunk of an elephant. His cockhead was size of a foal’s hoof and droplets of his urine were already falling from the tip.
He grabbed his stallionhood with his right hoof and tried to steady his aim, leaning to the wall with the left. As his stream started to form to a trickle, he needed to keep his eyes shut for the lights were too bright for him, missing the toilet couple of times.
Once he finally aimed in the right way, he let out a loud groan and his stream became stronger and stronger, creating a healthy splattering sound as he aimed his junk in the middle of the toilet.
It felt so good!
He was so relieved he totally ignored the other pony in the room, that pony being his own sister he had known and loved for so many years. He was in bliss and sunk deeper into the orgasmic feeling of the moment.
Twilight was having quite a show in front of her. She was still lying in the bath tub, feasting her eyes in the sight of Shining’s fifteen - no, 16-inched gushing length. It wasn’t even hard and it was twitching along the pressure it was releasing. The air was filled with the masculine scent of Shining’s musk and urine.
She felt a twinge in her stomach and leaned backwards, her bottom pushed against the edge other side of the tub. She felt her clitoris beginning to swollen, shooting against the edge as it winked out. Her marecum was starting to seep out.
It wasn’t the first time she had seen his brother urinating, having seen him go for many times throughout their youth, either by walking into him by accident when he was using the toilet or catching him relieving himself in the bush.
Shining himself didn’t have a shy bladder at all but the act itself, being so mundane and something he did so often, wasn’t his cup of tea. He wasn't interested of mares doing such a thing - not that he had ever watched. Right now Shining was too sick to even care whether somepony was watching him or not.
Twilight on the other hoof felt ashamed she liked such a thing so she blocked those thoughts from her mind, for all eternity, as she told herself, but now that nostalgic tingly feeling of watching her brother relieve himself was waking up inside of her. The act was so intimate and somewhat taboo, even though it was completely natural. It was still his brother doing it, one of the closest stallions in her life.
Having been virgin for god-knows-how-long, she relished anything sexual happening in front of her. It was a real penis she was now seeing, spurting heavy liquid that had an irresistible smell which made her hormones going. She started becoming wetter and wetter and needed to cross her legs, although it didn’t really help the situation.
Why did her brother have to be so hot?
”Oh Celestia! This is so awkward!” she thought to herself while keeping her eyes locked in her brother’s member, his stream still arcing towards the toilet and not showing any signs of stopping. She fought the temptation of moving her hoof closer and touching her brother’s turgid schlong.
Shining went over for a minute and half, almost two minutes before his stream started to slow down to a trickle, his tip finally shooting the last couple of squirts into the water. Shining sighed yet again and, to Twilight’s surprise, started to shake himself dry, to get off the last droplets that were still clinging onto his tip. Drops of his urine were flinging around as he did it.
Oh my, Twilight almost said out loud as she was watching her brother’s meaty length swing like a fire hose, her blush deepening. She was positively winking against the edge she was leaning on. This was definitely something she would remember on her nightly alone times on her bed.
That’s it, she would go straight in her room and masturbate right after this was over!
After dragging on his shaking for a while, Shining let go of his member and flushed the toilet. His junk retracted to it’s hiding place and he stumbled to the sink next to him, not caring to put the seat back down, and tried to balance himself.
His eyes had now gotten used to the lighting and he finally noticed Twilight’s presence next to him. He turned his head and looked at Twilight’s blushing face, as she shifted her legs uncomfortably and tried to look away. After such display of manliness she had hard time fighting against the want to jump on her brother and let him rut her like no tomorrow!
”Um… Morning, Twi-!”
It was only then when the sink he was leaning on broke under his weight, pulling him along to the floor. He managed to break a pipe while falling and it sprayed cold water on him and his horny sister.
”Whaaa-! Goddammit Shining!” Twilight shrieked as she got her share of water in her face. This wasn’t the kind of climax she had in her mind!
***
”Mom… Dad…! I destroyed the bathroom!”
Shining Armor admitted to his parents, that were sitting in front of him in their living room, looking rather disappointed. Twilight was standing next to him looking as ashamed.
”Yup, you did!” replied his father Night Light. He had a stern look on his face, even though it was pretty likely just an act.
”Luckily you didn’t hurt yourselves” said his mother Twilight Velvet who was also as done with her kids’ antics. ”Don’t worry, our insurance will cover that up.”
”Thank Celestia!” Shining sighed in relief.
If he was so prone to accidents after drinking, he would definitely NEVER drink again. Or at least for a week or two. Maybe next time’s a charm…
”I just don’t get it…” said Night Light. ”How come you managed to cause property damage while having a HANGOVER and not while drunk? Back in my day it was always the other way around!”
”Oh, don’t you exaggerate!” Velvet giggled. ”I was the one who was breaking stuff while drunk, YOU just wanted to drink tea!”
”Exactly!” replied Night Light with a worried look. ”Why did our son have to take after you? I was a model student!”
Shining and Twilight sighed in unison. It was totally going to be one of those days.
What a happy Sunday, indeed!
”Hey guys!” They suddenly heard Spike’s voice by the stairs. ”What did I miss?”
-THE END-
Author's Note
This story was inspired by one scene of Shakespearicles's Cat's Cradle, which I expanded upon. I liked the idea so I made it more graphic, detailed and awkward for the characters, so that I would never have a reason to do it again. 
I hope this made someone's day, though. There's never enough WS of these characters! 
Addendum: This is de facto my 2nd fic I uploaded here as I wrote this before my G5 story, it was just approved after that one.
