When Ponies Collide

“Oh, Sweetie BEEEEEEEEEELLLLE!” Rarity sang out as she entered her boutique. The dark, dank air wafted into her nose and she recoiled a bit. Ugh…what is that repulsive aroma? She asked herself before noticing that the trash had not been taken out as she had asked her sister to. She was just about to throw a minor hissy fit to herself when the offender came prancing into the room. “Hi, Rarity!” Her sister said sweetly, “what’s up?”

“What’s up, darling, is that the trash was not removed last night. I believe I asked you to do so.”

“You aren’t my mother!” Sweetie replied defiantly.

“No, but I am the owner of this building, and as the owner, I kindly asked you to do me a favor.”

“You didn’t kindly ask me! You commanded me!”

“Oh, darling, how I asked is irrelevant. The point is I asked you to take the garbage out, and you failed to do so. Now the boutique reeks of old banana peels, moldy food, and dirt of all kinds. Now, please, be a dear and run it out to the curb.”

Sweetie Belle grumbled under her breath, but the filly did as she was told. When she returned, her nose was wrinkled a bit and Rarity was finishing a small aromatic spray of the room. “There,” the fashion lover said, “now the boutique smells as good as it looks, and I must say, it looks extra shiny this morning! It’s almost as if…something special is supposed to happen today.”

She gave Sweetie Belle a devilish look and smiled. The younger pony couldn’t help but detect a trace of something deviant in her sibling’s blue gaze. It was odd, to say the least, and she couldn’t help but wonder what in Equestria was going on. “Sweetie, darling,” Rarity continued, “it’s time you and I had a very important talk. Let’s go into my bedroom.”

Sweetie, stunned into silence, followed her sister. She wondered why Rarity was wiggling her rump at her in such a manner, and why she seemed to enjoy it. There was a tingling sensation under her tail, almost like the greatest itch in the world. She wanted very much to scratch at it, but she didn’t know what Rarity would say. So she kept her hooves forward and trotted into the room behind her sister.

After shutting and locking the door, Rarity turned to Sweetie. “Now, I’m going to give you a potion. Whether or not you drink it is entirely up to you.”

“What does it do?” Sweetie asked.

“If you drink it, you’ll find out,” Rarity said, batting her eyes.

She turned on all of her charm. Ever since the orgy, she and the other mares had been clamoring for Starlight to turn their vaginas into penises for sexual reasons. The light purple mare had refused, stating that too much of the magic would leave them as stallions forever. But she gave each of them a small potion to do the trick for a few moments of pleasure. Rarity knew she wanted to give Sweetie Belle her first experience in bed, but she needed her little sister to be older. Under Equestrian law, just as under human law, a pony needed to be a certain age to give consent. Sweetie was still a year or two away from that age, but the concoction she had been given would help speed up the aging process.

“I’m not gonna force you, Sweetie Belle, but know that if you wish to continue, you’ll have to drink all of it.”

Sweetie looked at the pink drink with an odd mixture of curiosity and hesitancy. It looked good, but would it do something she didn’t want? She trusted Rarity, but she didn’t know what was coming, and fear of the unknown was beginning to grip her small body. I wanna know what happens next, she reasoned, but what if Rarity wants to hurt me?

“This…is okay…isn’t it?” She asked cautiously.

“Of course, my darling! You can trust your big sister.”

Sweetie sighed. “Okay…I’ll do it, mainly because my curiosity is just begging to be satisfied. But, if this turns out badly, you’re taking the blame for it!”

“I understand,” Rarity said, putting her hoof up, “I take full responsibility for everything here.”

“Alright,” Sweetie said, “I’ll drink it.”

So she tipped the container up and drank all of the liquid. She was surprised to find that it tasted incredibly sweet, yet bitter at the same time. She didn’t know if she liked it or not, but the potion wasn’t going to wait for her verdict. It immediately wrapped her up in magic and caused her to grow, much as she and her friends had done the time they had snuck off to the Appleloosa Fair. She turned into an adult mare, beautiful and confident. Her voice had matured and deepened ever so slightly, yet it still carried the same cute quality it once had.

“Wha…what did you do to me?” She asked.

“I turned you into a mare my age. Now we can do this and not have any guilt about it.”

“Guilt?”

“Darling, you need to be taught about the birds and the bees, and what better way to teach than by using…er…visual aids?”

“Oh…you mean the thing where a stallion puts his penis into a mare’s vagina and moves it back and forth and it feels really good and then the mare shoots liquid onto him and he shoots some kind of sticky substance into her and it gets her pregnant?” Sweetie asked rapidly.

Rarity’s mouth hit the floor. How in Equestria did Sweetie already know about sex? “Darling…wherever did you learn this?”

“From Apple Bloom. Applejack had ‘the talk’ with her a couple of weeks ago, and she told me and Scootaloo about it.”

“Are you…very interested?”

“Am I?! It sounds like an amazing experience!”

“Oh, darling, it is…” Rarity said dreamily. This was going much better than she had expected. She figured she would have to coo and coax Sweetie into agreeing to mate, but she saw that this was not the case.

“What do you mean, ‘it is?’” Sweetie asked, “have…you…done it?”

“Oh, darling, I’ve done it a lot! Let’s see…I had a wonderful one-night stand with Trenderhoof-“

“Trenderhoof? But I thought he wanted to be with Applejack?”

“Oh, darling, he did. But then I got ahold of him, and well…he was mine! Oh, the way we made love that night…he was amazing!”

“I’m sure you were pretty good yourself.”

“Yes, yes, yes, darling, but you never want to brag. Look, Sweetie…do you want to have sex…with me?”

Sweetie didn’t answer, but narrowed her beautiful green eyes as she slowly stepped in front of her sibling. Rarity felt her marehood quiver with excitement as Sweetie came ever closer and finally met her in a kiss. The sisters felt warm as they let all of their trepidations go and felt their bond grow immensely. Their tongues danced, and Rarity found that her sister’s mouth was even more amazing than she could ever have dreamed.

When they broke, Sweetie gave her sister a very alluring look. “Yes,” she said, in answer to Rarity’s earlier inquiry, “I do want to go to bed with you.”

Without another thought, Rarity pulled her sister into another kiss and began rubbing her hooves down her stomach. Sweetie Belle moaned into her big sister, and Rarity found this to be very exciting. Her pussy became wet as she deepened her kiss. They broke apart, and Rarity lay on the bed with her back legs spread. “Go on, my Sweetie Belle,” she said, “make me feel good.”

Rarity’s voice was like butter, and the filly turned adult mare quickly stepped forward. Rarity’s erotic flower bloomed in front of her, and she was mesmerized by it. The folds looked so soft and inviting, and at the top was her sister’s throbbing nub. She decided she’d play with that first, and test the waters. She used her hoof and massaged her sister’s sensitive area, and Rarity moaned deeply. “Oh…my little Sweetie Belle…that feels so good!”

Sweetie was happy that her sister was satisfied, so she continued. She even dared to prod at the inside of Rarity’s vagina, trying desperately to elicit more moans. Rarity’s voice drove her ever onward, but she was very gentle with her movements. Her hoof was soon stained with Rarity’s liquid, and the fashionista sat up. “Mm…that was wonderful, darling. But I believe it’s time you did something a tad more…invasive.”

With that, she brought out the special potion Starlight had given her. “Go on,” she said, “drink up. There’ll be plenty for both of us.”

Sweetie quickly downed the white liquid, and felt pain shoot through her lower half. She cried out in agony as her very body parts were rearranged. “Rarity, it hurts!” She yelped as she felt something growing out of her private area, “something’s happening! I need help! Please, Rarity, help me!”

Rarity smiled. “It’s okay, my love,” she said, “this is supposed to happen.”

When Sweetie finally felt the pain evaporate, she looked down to see that she had a rather sizable penis hanging between her legs. She squeaked and tried to hide it with her hooves, but Rarity got off the bed and moved them. “Rarity!” Sweetie said angrily, “that’s…that’s a stallion part! I’m no stallion!”

“Oh, darling, I know you’re not. But for the purposes of our little exercise, you need a penis. I’m going to have one as well after you’re done.”

“Done with what?”

“Done with me, darling,” Rarity said lustily.

She dove under her sister and began to give her an extremely hard blowjob. Sweetie moaned as her sudden and magical erection was sucked. Up and down the shaft Rarity went, stopping to kiss and play ever so gently. Then she would take the entire thing again, her heart thudding and her body feeling as if it were ready to burst.

“Rarity! Rarity!” Sweetie cried out as the pleasure began getting to her, “don’t stop! Please, don’t stop! Oh, my Celestia, this feels so amazing!”

Suddenly, Rarity did stop. Sweetie complained and whined, but Rarity put a gentle hoof to her lips. She didn’t say anything, but kissed her sister, allowing Sweetie to taste just what kind of a member she now had. Sweetie was enraptured by her sister’s saliva and her own sexual emission, and she fell under Rarity’s spell once again. “Now, then,” Rarity said as she got on her stomach and lifted her tail, exposing all of her backside. “Why don’t you fuck this mare?”

She batted her eyes, and Sweetie was entranced by them. They were so beautiful, and they sparkled in the light of the room. She stepped forward and tried to figure out how best to do this without harming her sister. “Rarity, how the hell do I do this?!”

“Darling, you have to mount me like a stallion would. Just get on top, grab my mane in your teeth, and shove your penis into whichever hole you desire.”

“There’s more than one?!”

“Of course, darling! Mares have three holes! I’ve shown you two, the mouth and the vagina, but…the third one is…well…a little embarrassing.”

Sweetie gasped as she recognized that the only other hole was her sister’s rump hole. “Um…you did wipe yourself after you went to the bathroom last, right?”

“Of course, darling!” Rarity said defiantly, “it would be unladylike not to. Plus, I don’t want everypony smelling what came out of there!”

“Okay…then I think…I’d like to try your rump first.”

“Go right ahead…” Rarity cooed.

So Sweetie gently pressed her new body part inside her sister’s rump. Her sister howled with pleasure as she felt the girth press against her very rectum. Soon enough, Sweetie found her rhythm and the two mares cried out in pleasure as they made love. “Sweetie! Oh, Sweetie! Fuck my ass!” Rarity cried, losing all sense of being a lady and turning into an animal, “your dick feels so good in there! Please! More! MORE! MORE!”

“Rarity, oh my Rarity! Oh, I never imagined your butthole feeling so good! Oh, my Celestia! Oh! OH! OH!”

Faster and faster Sweetie went, until both mares felt the sweet release of an orgasm coming. Sweetie had never experienced one before, and the feeling frightened her a bit. But all the same, the pleasure was dominant and she squealed in delight as the feelings heightened. “RARITY!” She screamed, “I THINK…I…I…”

“Oh, darling, I know,” Rarity said as Sweetie began slamming into her with reckless abandon, “keep going, baby! Keep going! More! You’re doing so well! Oh! OH! FUCK! FUCK! OH! SWEETIE BEEEEEEEEELLLLLLLLLLLLLEEEEE!”

Rarity screamed as loud as she could as her body finally released all of its pent up energy and squirted up and down Sweetie’s member. The penetrating mare, being unable to hold herself any longer, also screamed and unloaded deep inside her sister’s anus. She collapsed on top of Rarity, cuddling into her mane and sniffing it. “Mm…you smell so good,” she panted.

“Darling, we’re not done yet.”

“We aren’t?!” Sweetie asked.

Rarity cooed at her softly before flipping her onto her back. They both noticed that Sweetie’s penis had returned to its vaginal state, and Rarity was eyeing it with a lot of lust. She grabbed the rest of the potion and drank it down, creating a long penis of her own. “Now, Sweetie,” she said, “I’m gonna be as gentle as possible. You are a virgin, and I don’t wish to harm you. But this is going to hurt just a bit.”

“HURT?!” Sweetie asked with worried eyes.

“Don’t worry, darling, the pain will be replaced by immense pleasure within seconds. Now, then. Let big sissy fuck you.”

With those words, Rarity gently pressed her new member inside Sweetie’s vagina. Her sister screamed in agony as she felt her insides being torn asunder. Blood began flowing in a tiny trickle, but Rarity pressed on until she finally broke through her sister’s barrier. “RARITY, STOP!” Sweetie cried. Rarity immediately pulled out and kissed Sweetie Belle. “I know, darling, I know your first time can hurt. But you’ve got to get past this if you’re ever going to have healthy sex with a stallion.”

“I know,” Sweetie Belle said as the pain ebbed, “I just wish it didn’t.”

“Let’s try this one more time, shall we?”

Sweetie nodded and Rarity pressed in again, kissing her sister in the process. Her sister screamed into the kiss, but soon enough Rarity began making love to her normally and Sweetie’s cries turned into moans of pure bliss. She had never felt anything like this before. Her sister’s penis was so big, and she wanted every last inch of it inside her. “More, Rarity,” she begged, “fuck me more…”

“As you wish, darling,” Rarity said as she shoved inside all the way to her hilt.

“OH!” Sweetie cried out, “OH, YES! IT’S SO BIG! PLEASE, DON’T STOP, RARITY!”

“I won’t!” Rarity panted as her thrusts began to get more violent, “I won’t ever stop! I want you, Sweetie Belle! I love you!”

“I love you too, Rarity! Please don’t quit! Don’t ever quit!”

By this point, the slaps of their rear ends meeting could be heard around the room, and Rarity was thankful that the door was locked. She was wailing away at her sister, and both mares were experiencing the absolute peak of pleasure. She thwacked her sister’s rump with a hoof, eliciting even more intense cries from Sweetie. The two mares’ sweat mingled as it ran down their coats, and Rarity bent down and kissed Sweetie once again.

“OH, MY CELESTIA!” Sweetie screamed into the kiss, “I’M GONNA GO OVER THE EDGE AGAIN!”

Rarity broke the kiss and looked straight into her sister’s eyes as her thrusts became more violent than ever. “Let’s go together,” she said calmly, “one…two…THREE!”

With one mighty thrust and a scream that would have shaken the heavens, she shot her release into her sister’s womb. Of course, it was simple vaginal liquid, but the mare liked to think that she had impregnated Sweetie. Sweetie, for her part, let out a shriek of delight and poured forth waterfalls of her own. Rarity, feeling her penis revert back to a vagina, fell beside her sister and the two cuddled into each other. Their breathing began to slow down as they caressed one another and just enjoyed being sisters.

“Does this make us…lovers, Rarity?” Sweetie asked.

“In a way,” Rarity responded, running a hoof through Sweetie’s mane, “but I could never have a romantic relationship with you. It just wouldn’t be right. You know I love Spike…”

“If you love Spike so much, then why haven’t you done this with him?”

“Oh, sweetness, Spike and I fuck all the time. I mean, seriously. How do you think I got so much experience?”

Sweetie smiled and pressed even deeper into her sister. She felt safe and secure with her older sibling beside her, and she felt that their bond was now stronger than steel. It could never be broken. Their friendship had led them here, and she wanted very much to be able to return to this destination, but she was unsure that they would be able to. After all, Rarity was intensely busy with the shop and she was intensely busy with her Crusader work. “Can we do this again, Rarity?” Sweetie asked with her voice muffled in her sister’s bright white, sweat covered coat.

“Of course, my darling,” Rarity said, and felt a jolt of excitement course through her sister, “we can do this anytime you like, as long as I’m not busy. But…today will always be special. Do you know why?”

“Why?” Came the muffled, tired response.

“Because it was our first time, and the first time is something nopony ever forgets. I’m just glad I was able to share it with you, my dear sister.”

“Me too, Rarity,” Sweetie said as she closed her eyes and fell asleep with the warmth of her sister and the sweet smell of their completed lovemaking wafting in the air. It was definitely better than the smell of the trash.