Sweetie Belle was as happy as can be. She had a new coltfriend and he was coming to visit, so she was leaping about her room, desperate trying to clean.

"What should I do? What should I do?" Sweetie ran about, sweeping and dusting.

"Now Sweetie." Her sister Rarity tried to calm her down. "I'm sure Button will like your room as it is."

"But he's never been here before." Sweetie responded. "And I've never had a colt over and not just any colt, my cotlfriend!"

Ding Dong sounded the door bell.

"OHMYGOSH HE'S HERE!" Sweetie panicked, grabbing a towel. "I still need to shower, stall him." Sweetie was off to the bathroom before Rarity could say anything.

Rarity shrugged and made her way to the door.

'I'm happy Sweetie found a special somepony.' Rarity thought to herself. 'But is she ready for a relationship with a colt?'

Rarity soon reached the door. 'Time to meet this Button Mash.' Rarity opened the door to see the little brown colt.

"Hello." Button said nervously. "Is Sweetie Belle home?"

"She is." Rarity responded. "Come in."

Button came in the house and looked about. Seeing as how fashion wasn't his thing, he never went to the boutique, and how he was always too nervous to talk to Sweetie Belle before only recently.

"You must be Button Mash." Rarity said, looking Button over.

"Uh yes." Button said nervously. "And you're Rarity, Sweetie's sister."

"Yes I am." Rarity responded. "And there's no need to be nervous."

Button made his way into the house, Rarity couldn't help but mentally critique the young colt.

'He seems rather shy and nervous.' Rarity thought, 'But this is to be expec-what the?!'

It was only seen at the corner of her eye, but Rarity could of sworn she saw something rather big under Button.

'Maybe it was just my imagination.' She immediately thought. 'Then again, maybe I should test him.'

Button was sitting on the nearby couch in the parlor of the boutique. He was subtly trying to hide his slow growing erection.

'Why did this have to happen now?' Button worried in his head. 'I just have to endure until I see Sweetie. But she never said her sister was good looking.'

"Button dear?" Rarity asked. "Are you okay?"

"Uh-YEAH!" Button panicked to answer. "I'm-well-I'm fine."

'He's so cute that he's hiding it.' Rarity giggled in her head. 'I really shouldn't but as long as nothing serious happens, I'm sur Sweetie wouldn't be too upset.'

Rarity sat down besides Button and slowly moved her face close to his.

"Uh what are you doing?!" Button was worried.

"Just seeing if you have a fever." Rarity said, pressing her gentle head against Button's head.

Button's little erection was definitely getting bigger. He could hear his own heart racing and feel Rarity's breath against his skin.

"Hmmm." Rarity hummed. "You feel a little warm. And your face looks a little flushed."

Rarity moved her face away from Button's, who was now red with a blush. "Uh..al-alright."

'He's so cute when he's nervous.' Rarity thought as she turned around to walk to the kitchen, making sure to sway her hips, giving Button a good view. 'I can see why Sweetie likes him so much. But am I going too far?' Rarity looked over her shoulder to see Button trying to hide his almost full erection. 'How cute, he's getting turned on. Wait..he looks like he can't even hide it. It can't be that big, he's only a colt.'

Rarity turned around and walked straight back to Button, her face looked as though it was worried. Upon reaching Button, Rarity took hold of his little hooves.

"Uh Rarity?!" Button was worried she might see 'Little Masher'. "What are you-aahh"

"Oh my goodness." Rarity said aloud, after moving Button's hooves away.

Rarity got a good view of it. It wasn't the biggest Rarity has ever seen but it was necessarily large for a colt Button's age. Button was way past the point of embarrassed, but this embarrassment was sadly a turn-on, making him a little bigger.

"Oh my." Rarity started playing the innocent role. "What is this? It's so big....It must be swollen!"

"No no it's fine!" Button panicked, pulling his arms free and covering himself up again.

"That certainly won't do!" Rarity said sternly, staring into Button's eyes. "Just relax and let your big sister handle this!"

Rarity looked down at the penis. Her breath became heavy with anticipation, she knew exactly what to do, but how to approach it?

"Stay right there." Rarity said, gently pushing Button down on against the couch. "We need to apply some pressure to stop this swelling."

"I don't think that nessa-ahhhh." Button tried to resist but stopped mid sentence to the feeling of Rarity's warm and wet mouth on the head.

"Ouh dou id eel?" Rarity gagged on the size of the member.

"Please." Button adorable begged, unable to escape Rarity's grip. "What if Sweetie walks in?"

"Don't worry dear." Rarity said, removing her mouth to a faint popping noise. "We're not doing anything wrong, I'm only helping with your swelling." Rarity started jerking the shaft faster. "And this thing is quite swollen, it's as big as an average stallion's."

Button failed to stop Rarity from grasping his cock with her mouth and the feeling made his body unresponsive. Button knew this was wrong, but couldn't deny that he was somewhat enjoying this. Sweetie was amazing at sucking dick but there was something about Rarity that was different, almost better....maybe she was more experienced. He was getting close, very close, his body tightened up. He was about to-

"HOW COULD YOU?!" Shouted a voice from behind Button.

The shock forced Rarity to let go of Button, but the sudden sensation caused Button to shoot his load across Rarity's face. Turning around, with terror in his eyes, Button saw the tear filled eyes of Sweetie Belle glaring with sorrowful anger.

"How could you Button?!" Sweetie cried. "Why would you do this to me?!"

"Sweetie wait." Button leaped up. "I'm sorry, this wasn't meant to happen."

"But it did!" Sweetie was angry, walking towards both the guilty ponies. "HE'S MY COLTFRIEND!!!"

Stopping suddenly, Sweetie then leaps at Rarity. Sweetie began to lick the cum off Rarity's face.

"Sweetie Belle?!" Rarity said, failing to stop her younger sister. "What are you doing?!"

"Button is my coltfriend." Sweetie kept licking Rarity's face, the sensation felt pretty good. "So everything about him is mine."

"But Sweetie you can'-mmmfffhhhh." Rarity's sentence was caught off by Sweetie's tongue breaking through her lips and into her mouth, licking and sucking Rarity's mouth.

Sweetie released Rarity's mouth and the breathtaking experience dropped her to the floor. Sweetie then turned to Button, who was too afraid to move. Sweetie walked straight to Button. Closing his eyes in fear, Button expected the worse, but didn't feel anything. When he opened his eyes, he looked down to see a teary eyed Sweetie Belle staring up at him.

"Why Button?" Sweetie said. "Am I not good enough for you?"

"No Sweetie it's not that." Button said.

"Maybe I've been too nice." Sweetie mumbled, taking a firm and tight grip of Button's limp penis.

"Sweetie, what are you-oohhh..aahhh.." Button could feel the tightness of her hooves as Sweetie started to jerk Button off.

"I'm going to have to make this clear Button." Sweetie said, there was a serious look in her eyes as she kept stroke the dick, making it bigger and harder. Sweetie turned her gaze towards Button. "You are my coltfriend, this is mine!"

Sweetie picked up the pace of the stroking the shaft faster and faster. It wasn't too long before button felt like he was about to cum again.

"Oh no you don't!" Sweetie squeezed tightly on the shaft and bending it slightly. "You don't get to cum until I say you can." Sweetie let go of Button's shaft. "You stay there and you better stay hard!"

Sweetie made her way back to Rarity, who was still sitting there. Seeing Sweetie's attitude right now was a shock but intriguing and Rarity couldn't help but stay and watch. Sweetie didn't say anything, only pushing Rarity on her back.

"Sweetie, we can talk about-aaahhhhh" Rarity's words fell on deaf ears and Sweetie went straight to work, rubbing her hooves up and down Rarity's almost wet marehood.

"You were getting wet from sucking off my coltfriend weren't you? Weren't you!!" Sweetie demanded, rubbing harder and faster.

Rarity may have had some experience when it came to sex, but Sweetie was a whole different level. Rarity could feel herself ready to cum. It was too fast, even the feeling of cumming fast is making her want to orgasm.

"I'm sorry Sweetie." Rarity moaned, her body was unresponsive and refused to move. 'You know I would never try and come between you and your coltfriend."

"Oh I know that." Sweetie proclaimed, stopping her rubbing; leaving Rarity's body craving more. "You were just turned on by his huge cock! Is that what you want? Some huge cock deep in your soaking cunt?!"

"Please Sweetie." Rarity begged. "I didn't mean to hurt you."

"But you still did!" Sweetie teased. "Button! Get over here!"

Button didn't argue, he got up and went to Sweetie. Sweetie, in turn grabbed at Rarity's legs, spreading them open.

"I want you to fuck my sister!" Sweetie ordered.

"Wait what?!" Both Button and Rarity said.

"This is your punishment." Sweetie said. "I'm giving you what you want but you will not enjoy it."

Button felt bad about what he was about to do, but he was currently more terrified of what Sweetie would do if he refused. Button aligned the head of his cock to Rarity's pussy lips. Button tried to ease it in slowly, but Sweetie would have none of that. From behind Button, Sweetie pushed against his back causing his body to jerk forward and his cock split into Rarity's tight, wet pussy. The scream Rarity gave off was both one of pain and orgasm, and she sadly didn't last long. Sweetie's little hoof rub and the sudden massive cock breaking her open caused multiple orgasms and Rarity was down.

"Guess she couldn't handle it." Sweetie said with a triumphant tone.

As Button pulled his still erect dick from Rarity's open, soaked pussy, Sweetie took a hard grip on it. "I'm not through with you yet." Then she whispered."It's my turn."

Author's Note

I'm sorry if you consider this to be a little dark but I promise, everything works for the better in the end. That and Tartaras hath no fury like a mare(filly) scorned.

Two more chapters to go. Final target: Twilight Sparkle