The party wound down pretty quickly after that. Some took showers, others just hosed off by the pool, while some simply chose to go home smelling of debauchery. Eventually the only ones in the house were Scoots, Bulk, and I.

With my help Scoots and I took a shower together. I thought about having another quicky in the shower with her, but after she had well over 50 orgasms over the course of the evening she could barely stand. With my dress ruined, a fact that I regretted having to inform Rarity about, I had to borrow some of Scoots’ clothes. I managed to fit into a Wonderbolt soccer jersey and some yoga pants. I tucked her in when I was finished getting dressed. Despite the strong smell in her room she quickly drifted off to sleep.

Not long after Rarity texted me letting me know she was ready to pick me up. I stopped in the basement and grabbed Scoots’ handcuffs. I bundled them in my damp dress to hide them from my sister before heading out to meet her.

When I got to the car Rarity was already dressed in some lingerie. I could make out purple satin bra and panties under an almost see through white robe. She was clearly not wanting to waste any time before having our special midnight rendezvous. She didn’t see me at first and I noticed she was blushing. I heard a soft buzzing and it appeared she was trying to stifle moans.

“Looks like someone started without me.” I teased as I approached.

“Sorry Sweetie, modeling my new line for Fancy Pants made me really horny.” She panted, “Do not follow my example. Masturbating while driving is very dangerous, not to mention uncouth.” She reached between her legs and shut off her toy. It was then that she noticed the state of my dress. “Oh your poor dress.” she shrieked sniffing the air, “Is...Is that chlorine?”

“Yeah, you can punish me for it later.” I said winking.

“I just might.” she smirked as I got in.

*** *** ***

We barely made it inside before we were making out. I could feel the carnal want radiating from my sister as we ascended the stairs. The soccer jersey tossed on the kitchen table, Rarity’s robe tossed on the stairs. As we made our way to her room I slipped my fingers into her panties and began to finger her already aroused folds. Rarity in turn slipped her hand into my borrowed pants and stroked my dick. Even this soon after the party I was already hard and ready to fuck my sister silly.

We entered her room and made our way to her bed. I took charge and pushed her down to the bed.

“No hair elastics tonight.” I purred, producing the handcuffs.

“What are-” she began, but I silenced her with another kiss, locking her wrists in the cuffs around a bar on her headboard.

We parted and I gave Rarity a sultry smirk, “Last night you were in control. Tonight I am. Do you trust me?”

“Fleur is into this kind of stuff. Never tried it myself...it's-” she replied blushing.

“Uncouth?” I teased, “More uncouth than having sex with your sister, who not to mention, has a dick?”

“Fair point.” she relented, “Just don’t put the cuffs on too tight. It would be hard to explain bruises. If you want to do more...um...of this, please be gentle?”

“Careful, I might make you start calling me 'Mistress.'” I flirted and her cheeks bloomed a whole new shade of red.

I moved to kiss her down her neck, across her stomach and finally her womanhood. I stalled inches from her slick slit. I took in her sweet scent and let my hot breath tease her sensitive skin. I waited until I heard a soft whimper of frustration from my older sibling before I dove in. I was rewarded with a grateful moan of delight. I worked my tongue in her folds taking in every bit of her arousal. I can tell she’ll really like bondage if simple hand cuffs are making her this wet. Though she has been teasing herself for a while, the act is clearly making her more aroused than she'd like to admit.

I poked and licked deeply into her folds until she finally called out in climax, thrashing against her restraints. Her girlcum splashed against my face and dribbled down my chin as I made no real effort to drink it all. I had other plans.

I stood and removed the yoga pants and panties to free my hard on for the impending action. First I teased her by rubbing my dick across her soaked slit covering it in her heavenly girlcum. I needed it to be slick for what I wanted to do next. I shifted my sister on the bed so I could get a look at her virgin asshole. Rarity must have sensed what I was up to as I heard the cuffs clink against the bars in mild panic.

“S-Sweetie, what are you–WHAHAHH!” She screamed in a mix of fear and delight as I penetrated her ass.

It was a tight fit, the tightest ass I’d been in thus far. I really should have loosened it up first. Rarity’s gonna be sore in the morning. I’d only made it half way into her anus before stopping. Her body soaking me in another wave of girlcum.

“Dear sister,” she addressed me, barely covering a moan, “I thought I told you this was unladylike.”

“Want me to stop?” I teased, “Because I’m pretty sure you just got a second orgasm from me just sticking it in.”

Continuing my teasing I began to remove my member from her ass.

“Don’t.” she whispered.

“Don’t what?” I purred.

“Don’t take it out.” She whispered.

“Take it out?” I went on, “Ok.”

“Don’t take it out.” She begged.

I smirked, “So what do you want me to do?”

“P-Put it in my asshole,” she stammered, turning redder, “and fuck the uncouth shit out of me.”

At that I slammed my dick back into her ass, this time all the way to the hilt. Rarity let out a rather unladylike moan that I had no doubt could be heard all the way at CHS. I pulled out again and pushed back in. Another moan. Another thrust, faster, faster. Her never used backdoor pleasure spot was massaging and pulling on my dick like no other I’d fucked. Soon my own moans joined with hers. I’m pretty sure Rarity came four more times while I destroyed her ass. Finally I was pushed over the edge and came into her ass. The pressure shooting my incestuous cum out along the side of my dick.

Soon we were both panting and enjoying the afterglow. I took my softening dick out of her ass and let the rest of the cum flow on to the bed.

“Sweetie?” Rarity panted, “You've been a naughty girl. First you ruin my dress, then my ass. You need to be punished.”

“What did you have in mind?” I asked, leaning over to kiss her.

We parted and she answered, “Unlock me and you’ll find out.”

Her silky voice and the promise of some naughty punishment renewed my boner as I unlocked the cuffs. As we swapped places, Rarity left the room and I was left with my thoughts. I wonder how she’s gonna punish me. I hope she spanks me. The memory of Luna;’s brutal punishment causing some precum to dribble from my cock. No, the cuffs were her first experience with this kind of stuff...right? Then again until last night I wasn’t fully aware of how much she loved me. There might be other things I don't know about her.

My thoughts derailed as Rarity reentered carrying a nondescript black box. It reminded me of the one Applejack had back in the CMC clubhouse, but was bigger.

“This was a gag gift from Rainbow on my last birthday. Though from the kinds of things she’s been teaching you, maybe it wasn’t so much a joke.” She explained, opening the box.

“I think I saw AJ with a box like that...smaller though.” I replied, trying to get a look at what was inside.

“RD got her a pulsemaster vibrator.” Rarity answered, not at all surprised, “Though AJ swears she doesn’t use it. Guess she’s getting better at lying.” She paused as she removed a red ball attached to a leather strap, another set of handcuffs, this time frilly purple ones, a few purple candles and a small leather whip. She set all but the whip aside. “She got me the dominatrix starter kit.” She murmured, sitting next to me on the bed, “You're due for a good spanking.”

I could feel the red on my cheeks. She was going to spank me! I stood and laid across her lap. My still hard dick slipped between her legs as I assumed the position I had not used since I was a little girl...well not counting the other day in Luna’s office.

Rarity cleared her throat, SMACK! I stifled a moan. “That was for ruining your dress.” SMACK. I felt the hit send shivers down my spine and my dick twitched between my sister’s legs. “That was for being uncouth.” SMACK. I couldn’t hold back my moan as my dick released a rope of cum. “Naughty sister, you're enjoying this.”

“Yes… I mean no, keep punishing me.” I begged.

“I think we need a different punishment.” She teased, “Lie back on the bed.”

I did as instructed, enjoying the aftershocks of pain from my still tender ass. The whip is more painful than the belt, but I think I like it more. Once I was back in the bed, I found myself being locked into the cuffs. Though I didn’t look, I could tell which was Scoot’s and which was my sisters. Hiding the cuffs in a wet dress was not the best idea as it was still damp. After the cuffs were in place Rarity returned the box and took out some rope. That was used to secure my feet to the other end of the bed. My heart was racing as this was my first time completely restrained. It only turned me on more. Lastly my sister secured the ballgag around my head.

“Didn’t think I’d use this, but you have a thing for pain...and you need to be punished accordingly.” She said picking up a few candles.

She returned to the box one last time to take out a box of matches. She lit a candle and mounted atop me. I could feel the heat emanating from her vag as she moved the flame towards my chest. The flame mirroring the heat.

“You've been rather naughty, Sweetie Belle.” She whispered, “growing a dick,” a drop of wax fell to my undersized bosom. The pain causing me to moan through the gag, “Ruining my dress.” anther drip, another moan, “Having sex with all your friends and a few of mine.” Another drip, another moan, “and lastly, awaking the uncouth nymph your dear sister tries to suppress.”

She blew out the candle and tossed it aside. Sliding my quivering hard-on to its hilt in her snatch. She then began moving up and down Moaning with reckless abandon. I was helpless to her lust, restrained and gagged on the bed. As she pushed into another orgasm, she dragged her finely manicured nails into my chest pulling up the hardened wax. The act causing my own climax. Rope after rope of my hot seed. The key that unlocked my sexy, slutty sister’s perverted side. It filled her to the brim and flowed out onto my balls.

As she came down from her climax, she unhooked the ballgag and kissed me deeply as she slumped on top of me.

“I’m so glad you finally came of age and pulled this side out of me,” she sighed, breaking the kiss, “I love you Sweetie Belle.”

“I love you too, Rarity.” I whispered.

“I can tell.” she whispered back before drifting off to sleep.

I just lay there enjoying my sister’s scent and warmth. I wasn’t concerned about the fact that I was still tied and cuffed to the bed, I just took in the moment and watched my sister sleep until my tiredness from all my sexcapades finally knocked me out too.

Author's Note

And with that we are finally into the Saturday of the fic! Sorry this chapter took so long....I have to be a special kind of horny to write this...and I haven't been until a few days ago.