After the game of secret masturbation it was getting late and I had to head home. Since Rainbow Dash and Gilda were heading out as well they offered to drive me home. My borrowed panties were still wet so I told Scootaloo to wash them and give them to me the next day at school. She invited the three of us over tomorrow since her and her brother were throwing a party. I texted Applebloom and Treehugger inviting them to the get-together the next evening and left for home.

“So, Rainbow, when did you and Scootaloo start being...you know intimate?” I asked as we turned out of the driveway and towards my house.

“I think it was last summer. She had an incident at Flim & Flam’s Fun Center.” She explained, batting Gilda’s wandering hand away from her lap, “She accidentally masturbated in a go kart. Let’s just say I talked with her about it in the restroom after and things happened from there.”

“Oh…” I said flatly, I knew parts of the event, but wanted to confirm that was when things happened.

It was also the same reason why Rarity refuses to go back to F&F’s Fun Center. Though she thought she sat in pee, I learned it was Scootaloo’s cum. Like I said, Scoots, AB, and I share just about everything with each other, though such lewd occurrences were the exception...until now.

Not much else was said aside from Dash yelling at Gilda for trying to finger her while driving. For someone who was so against carpet munching, she had no qualms about fingering in public. My perverted mind wanted to have a sexual experience while driving, even though I knew it was dangerous. Though I was able to nix the idea based on the fact that despite being 18, I only had my learner’s permit and Rarity was never free to teach me to drive. Then again...it probably would be enough if just Gilda sat next to me. Fun isn’t exclusive to the driver’s seat after all.

Finally we arrived at Carousel Boutique. I waved goodbye to Rainbow and Gilda and headed inside. All the light’s were out in the rooms o the second floor, so I figured Rarity was already asleep. Using the key under the doormat I unlocked the door and let myself in. I felt tiredness wash over me and I headed up stairs to my room, stripped naked and fell asleep.

*** *** ***

I awoke a few hours later when my pillow fell off my bed. I yawned and looked at the time. My phone said it was 11:59pm. After getting my pillow I tried to fall back asleep, but like when I’d first woken up with my dick, it was rock hard and I couldn’t find a comfortable position to fall back asleep without masturbating.

You’d think with all the loads this thing released today it would be tired too?, I thought to myself as I got out of bed.

I thought about covering up, but Rarity was asleep and I was only going to the bathroom across the hall. So trying to be a confident while naked as Treehugger had been, I entered the hallway. As I walked my hard on bounced merrily between my legs. I was then struck with a very lewd thought based on the last event from Scootaloo’s house earlier this evening. What if I masturbated down in the kitchen and then drank my cum again like a midnight snack?

My dick twitched as if agreeing with the raunchy thought. I made my way to the stairs and made sure that my sister was asleep. Based on her unlady-like snoring I figured she would be out for a while and I could masturbate in peace. The last thing I needed was for her to see me like that. Not only would I have to explain what I was doing, but why I wasn’t someplace more private, and worst of all, why I had a dick to begin with. The drama that would follow was something I didn’t need this late.

When I reached the kitchen I pulled out a tall drinking glass and got to work wanking my penis. Compared to the feeling of another stroking my dick, self stimulation just wasn't the same. It was like trying to tickle yourself, except a bit more possible. It just took far longer than when I was in the shower this morning to get into it, but before long precum was forming at the tip and I used it as lube to stoke more smoothly. I was so into it I didn't realize how much noise I was making until I heard a groggy voice from behind me.

“Sweetie? What are you doing this late at night?” Rarity asked tiredly. Luckily her angle was not quite right to see my dick, but my naked ass was there for all to see, “Are...are you naked?”

“RARITY!” I squealed in shock, losing my balance and tumbling to the floor, “Wha-what are you doing up?”

She didn’t answer and so I chanced a look at her, her normally alabaster face was beet red and radiating heat. She was also staring right at my stiff shaft. I’m doomed!

“Oh my,” she whispered in a perfect impression of Fluttershy, “Thats a nice...dildo? Are you masturbating in the kitchen?!”

I cringed visibly at her loud and appalled exclamation. I started to sweat nervously, thinking of any way to save this situation from deteriorating any further.

“Um, no, well, yes, sorry, and it's not a dildo.” I stammered out, not able to hide the truth as I was going red myself. The cat is out of the bag now, “Its...its um, a dick. A real dick. I, uh, have a dick now.”

“Really?” she asked, still transfixed on my member, “Well...um…”

She stepped closer and I froze. Then she did something I never thought my sister would do: she leaned over and touched it. In response it twitched releasing a glob of precum.

“Oohhhh…” she breathed, “I, um, must admit that it is a rather marvelous piece of equipment.”

A thought swam its way into my mind and I felt my blush grow darker. What if I had sex with my sister? I shook my head and countered the thought, No, that is wrong. So. Very. Wrong.

The venomous perverted part of my mind sang a siren thought, But you want to do it and so does she. Just ask her. There is no harm in that. The most she can do is deny you~

“D-do you want to, um touch it m-more?” I stammered, flinching at the incoming response instinctively.

“W-would you want to?” she asked, her question leaving me stunned.

All I could do was nod my head slowly. There was a pregnant pause as I waited for her next move. It felt like hours, but it was only a few minutes before anyone said anything else.

“Then lets.” Rarity purred, winking at me.

Finally I was relieved of my paralysis and got up. She grabbed me by the hand and pulled me close. Before I could react she planted a passionate kiss on my lips and I melted in her arms. It wasn’t like Scootaloo’s sloppy, post orgasm kiss. This was a refined, elegant kiss that only a high class fashionista like Rarity could give. She gently slid her tongue into my mouth and traced it expertly around the roof. Our tongues danced a majestic ballet. She kindly let my tongue then pass into her mouth and I tasted the cinnamon of her toothpaste. I wasn't as skilled as she was, but tried to mimic what she had done. As quickly as it began it ended and we parted lips. A perfect string of spittle connecting our mouths before falling away. Who knew Rarity was such a good kisser?

She parted our embrace and interlocked her fingers in mine. She then lead me back up the stairs and into her room. It was like a dream come true – a dream created only a few moments ago – but a dream come true nonetheless. I was just too happy to question it in the moment and decided to just go with the flow. She led me to her bed and had me sit down. She let go of my hand and removed her nightgown. She wore only a pair of red panties beneath it. A darker spot on them showed her arousal. She elegantly removed the cloth and returned to her bed.

Gently she had me lay down, her elegant body and breasts pressing into me. She planted another soft kiss on my lips before lowering her head. The next kiss was on my neck, then my chest, then my belly. Just when I thought my sister couldn’t be any more uncouth, I felt her lips on my dick. First planting a kiss on the tip, but then she took it into her mouth. I can’t believe this is happening, my sister Rarity is giving me a blowjob!

She started out slowly cleaning up the precum and replacing it with her saliva. Then she slowly picked up the pace. If Fluttershy had been the expert in cocksucking, then Rarity was the master. She pushed my buttons in all the right ways with her tongue in a way not even Gilda with her tongue piercing could. I was so turned on by not only the blowjob, but by who was giving it to me that It was feeling my edge fast approaching. I could practically feel the pressure building in my balls. I was so close to cumming when suddenly she stopped and removed my member from her mouth.

“What are you doing?” I whined in a daze.

“Your very sensitive down there.” she commented in a sultry tone, “It would be unpleasant to have you coming before I do, don’t you think?” She reached into a drawer next to the bed and pulled out an elastic hairband, “This should do nicely.”

She stretched it, pulled it to the bottom of my shaft, twisted it and pulled the second loop down to the base. She then returned to sucking my dick and in no time I was ready to cum. I reached out with my hands, feeling her soft elegant locks as I was gripping her head. I was needily pulling it to my crotch as I felt my dick breach her soft throat. My dick twitched as if to cum, but no cum came out. I let go of her and let out the breath I was holding.

“What i-is going on?” I asked in confusion.

Rarity just smiled and wiped spittle off her chin with the back of her hand, “It's a trick Fleur De Lis taught me. Keeps a dick from cumming until you remove the elastic.”

I suddenly regretted wishing there was a penis version of what Rainbow had been doing to Gilda, but my sister was in control now and she always got what she wanted. If she wanted to cum first, she would cum first. I couldn’t really do anything against that, no matter how frustrating I found this denial.

As if to apologize for the inconvenience she kissed me again, though this time it was more sloppily. As she did she began to stroke my dick. She then guided my hand to her private parts and I picked up on what she wanted me to do. I began to finger her and she moaned into the kiss and began to stroke faster. I returned her moan with my own and increased my speed. Before long I felt her walls clamp on my fingers and she broke the kiss to moan loudly as she orgasmed. She continued to stroke my dick as she convulsed in pleasure. Not long after I was thrown over the edge again. My dick strained against the hairband, but no cum came out. I don’t understand, She came, why can’t I?!

“Not yet, my dear Sweetie Belle. A true lady needs to control her urges,” she purred in my ear, as if sensing my question, “Besides your big sister Rarity isn’t done having her fun yet. I’ll let you cum in time.”

My sister is the devil.

She leaned forward and flaunted her large bust before pushing my head towards them. I opened my mouth and began to suck on her nipple. As I sucked she put three fingers in her already glistening slit and began to pleasure herself again. Feeling like giving a little payback for not letting me cum I bit down on her nipple. She moaned loudly as I did cumming a second time on her hand. My plan has backfired!

When she came down from her second orgasm she laid back on the bed, “You know I gave you head. And as a proper lady I think it is time for you to return the favor.” She ordered and I obeyed.

I knelt in front of her on the bed and stuck my face in her snatch.

“You can masturbate while you eat, but no removing the band.” She said between moans.

For a brief moment I thought about disobeying her and removing the band, but I didn’t want to be stuck only cleaning her carpet. Rarity after all would certainly disapprove if I came now and as a punishment possibly cut our fun short, even before she could make me cum on her own, so I kept it on and just stroked it. The faster I stroked the more into eating out my sister I got. My tongue dug deeper and deeper into her folds trying to find all her hidden pleasure spots. I found her clit and sucked on it enjoying the sweet tang of her girlcum and juices. She moaned with a loudness that outshined both Gilda and Dash. I was glad our parents didn’t live with us, they would for sure have heard what we were up to. I just hoped our neighbors were sound sleepers. That would be awkward to explain.

We came simultaneously, or I would have if it weren't for the headband. My dick twitched pathetically with the extreme want to ejaculate and despite the pleasure it was actually starting to ache. I hope she lets me cum soon.

“So, what’s next?” I asked between pants, “Anal?” I inquired further, hoping my sister would finally have mercy on my poor cock.

“A lady does not stick it where she poops!” Rarity gasped appalled, “It is so uncouth, repulsive. You haven’t done such a thing, have you?”

Yeah, several times. Diamond Tiara, Fluttershy and Rainbow Dash. Treehugger also did it to me once.

“No, of course not.” I lied.

“Good girl. Now for the main event.” She said positioning her vagina on the edge of the bed and spreading her legs.

She reached down and pulled off the hairband, to my surprise I didn’t cum right away. My dick twitched, it was far more erect than it had ever been before and some splodges of pre came out. It was highly sensitve now and a slight breeze could have set me off. Instead of waiting for that to happen and paint my sister like Jackson Pollack, I stuck it into my sisters waiting slit. I almost lost it then and there. The thought of defiling my sister in a way no sibling should was almost too much.

Before I could think about the act any further I began to thrust with all my might. We both moaned loudly in pure carnal bliss. We didn’t care if our neighbors heard. Let them. Let them know we are more than sisters, we are incestous lovers. Let them hear our loud fits of passion in the dead of the night. Heck, I once heard there was a place in Tartarus for that special brand of naughty, and right now I wouldn’t mind going there together with my sister. In this moment it all seemed worth it.

I could clearly hear the slapping of my balls echoing in my sisters spacious room. I could feel the pressure building in my balls far greater than any orgasm I’d felt before. And I could experience Rarity’s walls closing around my dick, lustfully pulling me to the brink of lust-fueled madness.

“Oh, yes! Sweetie Belle!” She screamed as the orgasm rocked through her core, “Fill me with your incestuous seed!”

Her words were more than enough to push me over the edge, the intense orgasm shattering my mind until everything went blank. I exploded rope after rope after rope. I splattered my baby batter all up in her fertile womb, breaking one of the biggest taboos in society. I coated her vaginal walls to the point where my seed spilled out onto the bed sheets and floor. The cum just kept on cuming. The combined cum of all the previous blocked orgasms emptied into my sister. I felt like I came for a solid five minutes.

Finally it stopped and my dick began to soften. A wave of tiredness washed over me as my dick slipped from my sister’s pussy, spilling more seed onto the bed. I fell atop her and she hugged me close in a loving embrace. With my last bit of energy I reached up and lightly fondled her breasts.

“Thank you, Sweetie.” Rarity sighed, still lost in her afterglow, “I’ve been so stressed with my new fashion line lately. I really needed that release.”

“I was stressed too.” I replied in a soft whisper, “Then Treehugger told me about this shop. I never would have thought it would give me a dick. But now I think I’ve never been more relaxed in my life, too.”

“Then I’ll have to thank Treehugger properly.” Rarity said with a yawn, “After all she gave me a way to spend quality time with my loving little sister.”

I blushed and let out a content sigh. I secretly wondered if Rarity planned on rewarding Treehugger in a similar fashion to what we had just done or if she would give her something more practical and less uncouth. I was about to ask when she let out another yawn, pulled the covers over us and closed her eyes. I mirrored her sentimen. The warmth of her body lulling me to sleep. It was the end of a very interesting day and I had a feeling there were many more to come.

Author's Note

this was inevitable based on the type of fic this is and who it stars...