To Be One with Generosity

by AppleOfThineEye

Rating: mature
Tags: Sweetie Belle, Porn, My Little Pony: Friendship is Magic, Fetish, Rarity, Romance, Sex
Length: 11594

On a slow day in the boutique, Rarity and Sweetie are busy being sisters when Rarity begins to get some urges she can't ignore. Sweetie quickly melts into the same inclinations.

It is a slow day at the boutique, and Rarity has been quite productive out of the blue. However, after some sibling interactions, things become much more playful between her and her sister. Soon, the two are getting together in a way sisters normally would not. And soon after that, some very strange things start going on between the two. Opal and Tank, who Rarity is pet-sitting, aren't free of oddities either. None of them are going to end the day quite the way they started it.

This story is a follow-up to To Be One with the Rainbow, but reading it is not required to enjoy this one. This story contains spoilers for chapter one of To Be One with the Rainbow.

Special thanks to superfun for co-writing and co-editing!

Chapter One contains: nuzzles, foalcon, incest, crotchboob transformation, permanence, milking, and identity loss

Chapter Two contains: turtle-on-cat action, mild voyeurism, cock transformation, permanence, and identity loss

Chapter Three contains: bestiality and tit-fucking

Published 2021-01-24 21:50:01 UTC
Last updated 2021-01-27 21:52:33 UTC

Chapter One - Milk on the Mind

"Rarity!" Sweetie whined from the backroom where she was drawing pictures with half-broken crayons - levitating one after another over to scribble onto her parchment. "Did you do something with my purple crayons?!"

It had been a slow day, but one not so productive. With how much work Rarity got done the day before from an inexplicable stretch of inspiration, the white mare thought herself entitled to a break. Of course, she hadn't counted on Cheerilee giving the filly the day off simply because her friends were apparently nowhere to be found. Rarity had been predictably less worried; Applebloom and Scootaloo were both rambunctious and adventurous, and with Applejack also not seen for some time, the mare was convinced the three of them were safe. She did, however, make a mental note to check for a second time with Big Mac the next day to confirm he also did not worry about his younger sisters.

The introspection was quickly followed by another call of that shrill voice of the filly that, though she loved- "And do you know where we have some extra paper?!" -she really, REALLY hated sometimes.

She took a deep breath as she laid down the tea she was currently sipping, looking over at Tank and Opal. Rainbow Dash had dropped her tortoise companion off earlier that day, saying she needed a sitter for him while she went off to do something. And, with Twilight away in Canterlot for the day doing something with the Princesses, she was obviously the only available candidate, so she generously accepted.

"I never touched your crayons, darling! And there should be some extra paper in the drawers in my inspiration room! Just be careful, I've got some designs in there that I don't want you to mess with," she called back

The filly could be heard shifting - getting up and then trotting towards the room specified as she shouted back a quick "Okay, Rarity!"

Sweetie adventured into the inspiration room, using her horn to better-illuminate the room darkened by the late afternoon and closed curtains. She walked towards Rarity's work desk, careful not to tip over any of the several mannequins within the room. The dark wasn't a huge fear of the filly, especially in the boutique - but introduce mannequins to that darkness, and she was nervous, at best. Still, she pressed on, taking a deep breath of relief as she curved towards the front of the desk and grabbed the handle of the lowest drawer. She was lucky - finding the extra paper on her first try. She levitated it out of the drawer and prepared to leave, swiftly closing the drawer and turning her body to move 'round the desk once more. And then, she screamed - dropping the paper in fear. What she was immediately staring at, she was sure, was a mannequin designed exactly like her. A thing of nightmares. It was screaming back at her. In reaction to the horror, the filly instinctively zapped the foe. It would be little more than a tickle to any evil creature.

But it was enough to shatter a mirror, to be sure.

Immediately upon realizing her mistake, the filly shrunk back - ears folding down and small body stiffening as she backed up and curled up under the desk. Maybe there was a chance Rarity didn't hear. Maybe if she did hear, she wouldn't be all that mad. Maybe it was an easy fix. These sweet little lies Sweetie fed herself did very little to beat back her quivering fear - now more of her sister than any daydream she might conjure in her stead.

At first, Rarity was concerned when she heard Sweetie's scream, but the subsequent blast of magic and sound of glass shattering wiped that away, her eye twitching a bit. Straining to maintain her composure for at least a little while, stood up from her seat. "Sweetie Belle, was that what I thought it was?" she called in a faux-curious tone as she walked over, her hoofsteps sounding like thunderclaps to the scared child.

The expression on Rarity's face was enough for Opal and Tank to go into one of the other empty rooms, Tank riding on the cat's back. They knew that whatever was going to happen was going to be unpleasant, and they didn't want to risk accidentally getting caught in the crossfire between the two sisters.

The filly under the desk prayed that she might not be found, as futile as she knew that was - especially with how shaky her breathing was. Hell, her booming heart could practically be heard from the entrance of the room even. She tried not to make a sound, as though Rarity were a mirage that might fade away before reaching her hiding place. There was little more to hope for. On the floor lay the broken evidence of her ultimate mistake, yet she could not garner the courage either of her school friends might have gathered to apologize. She just kept quivering, isolated from the world, save her fear and the thunder of the coming lecture.

Rarity, upon finding the cracked mirror, took another deep breath. There were some very choice words she wanted to use, but she could not, for a lady does not swear. At least, that's what she told herself as she used her magic to lift the broken pieces and throw them out. She knew from experience that once a mirror was broken, it was hard, if not impossible, to repair. And even the few times she was successful, there were always cracks that remained. Cracks that were impossible to ignore, especially when she was trying to work.

"That Sweetie Belle, always making a mess," she muttered as she cleaned up.

The hidden filly bit her hoof to try to stifle her shaking breath, too scared of coming out of hiding to help her sister clean up - much as she knew it was her fault. But she knew she couldn't stay there. She'd be found out soon enough if she didn't vacate the scene of the crime. Sneaking while Rarity's back was turned, the filly crawled out from her spot and carefully slunk towards the door of the darkroom. Unfortunately for her, she forgot at least one important factor in her environment.

Mirrors, however broken they are, continue to reflect.

Sure enough, Rarity spotted the sneaking filly in one of the broken pieces. Not even turning around, she gripped her in her magic and placed her on the floor in front of her, a safe distance away from the remaining shards. "You are not going anywhere until we talk, Sweetie Belle," she said sternly before resuming cleaning up the glass. "And we WILL talk about what just happened."

"I was just-!" Sweetie tried to justify, words catching in her throat. There was no weaseling out of her cowardice, ironically. She sighed, looking down at the floor and watching as Rarity lifted shard after shard. Sheepishly, the filly levitated one of the shards into the trash, then a second. All of the mess was piled before she could levitate a third. Still not ready to face the music, the filly kept her ears folded down as though that might shield her from the lecture. At the same time, she kept her gaze fixed to the floor. Surely if she didn't look at Rarity, she didn't exist.

Rarity did not say a word to her sister as she dropped the broken pieces into the room's trash can. The dress designs that just didn't work for her were joined by the glass shards of the broken mirror. She took a moment to take another breath and rub her temple with her hooves before turning back to face her sister.

"I don't know what angers me more. The fact that you broke the mirror when I specifically told you to be careful, or the fact that you tried to sneak away while I was cleaning up. What were you thinking, darling?" she asked, her tone and expression carefully blank.

Haunches creating a stone-like impression into the carpet from her slouch, Sweetie shrugged - moving her hoof back and forth as though the fibers could wipe away her half-concealed shame. "I... the room was really dark, and the mannequins are really spooky..." she explained sheepishly, not daring to look up into the whites of her sister's eyes. "I was being careful not to knock anything over - I got the paper - and I was just about to leave when I swore one of them looked just like me..!" The absurdity of her imagination swelled in her throat along with the recollection of fear, drawing forth the need to swallow. her breath uneven, she continued: "I screamed and it screamed back at me. I-I didn't know it was a mirror..."

"And your first instinct was to blast it with magic instead of, oh, I don't know... coming to get me!" Rarity briefly snapped before taking another deep breath. Her sister's explanation soothed her anger just a little bit, but she was still extremely cross. "And why didn't you just use your magic to turn on the light switch? You know it was right by the door." As if to demonstrate, she flicked the aforementioned switch a few times, the light going on and off. She continued to stare expressionlessly at her sister, waiting for her response.

The filly winced, stung by the shout - her body now stiff with the fright of something much more material than her own ghost. Her hoof was now firmly planted on the floor, she swallowed again. "I... I-I just wanted to try to be a little braver..." she murmured pitifully, eyes watered but unseen by her sister. The shake in her voice, though, suggested a strong inclination towards weeping. "Like, like Scootaloo or Applebloom!"

Rarity's eyes widened briefly at her sister's words, but she quickly adopted the same expressionless face she had been wearing. "What do they have to do with this?" she asked, in a tone that indicated she was trying to still be at least a bit angry, but the calmness in it was noticeably less forced.

"I've been... worrying about them and worrying they might be in trouble," she exhaled, starting to recover from the peak of Rarity's rage. "I was making posters of them. I'm scared I might not see them again..."

"You know how rambunctious those two are. I'm sure that wherever they are, they're fine. I mean, Applebloom probably has Applejack with her. And if I know Dashie, she's probably out searching for Scootaloo right now," Rarity said, gently hugging her sister, her prior anger all but forgotten now.

Sweetie let her soft eyes wet Rarity's neck as she nuzzled the white mare, hugging her back more tightly than Rarity gave. "Thanks, Rarity..." she said, words muffled by the floof of Rarity's neck.

"You're welcome, Sweetie Belle," Rarity said, the light scent of her perfume entering Sweetie's nostrils. While she wasn't planning on going anywhere that day, she still wanted to look and smell nice. A lady never skimps out on presentation, after all.

"Ha... you smell nice," the muffled voice came again, the filly nuzzling deeper into her sister's warm neck fur. "You always smell nice..."

"Heh, thank you. I do try my best," Rarity said with a gentle smile. "Maybe you could try some on for yourself?" she suggested gently.

With one more deep inhale of her sister's romantic scent, Sweetie withdrew her head and bobbed her head excitedly. "Sure!"

"Alright," Rarity got to her hooves, placing her sister on her back before walking into the bathroom. "Just be careful not to use too much, okay?"

"Sure thing, Rarity!" Sweetie chirped, hopping off 'soon as the pair were at the destination of the kitchen sink. Once Rarity had retrieved her perfume from behind the mirror of the cabinet, Sweetie levitated it towards herself with Rarity's permission and began to spritz it over herself one time too many. Once on her neck, once on the side of her stomach, once on her flank, and once more on the other flank. She then levitated back towards her sister, the bottle haphazardly tinking against the edge of the sink.

Rarity quickly caught it in her magic and put it back in the cabinet before it could fall. "Well... you used a bit too much, but I'd be lying if I said you didn't smell good with it, darling," she said after sniffing a bit, the smell being just a bit too strong for her, but she kept herself calm. She didn't want her sister to get worried again, and it wasn't like she had dumped the perfume bottle on herself.

"Thanks!" the filly beamed, smile as bright as her sister's fur - perhaps even more so. Her tail flicked with the excitement of the moment, making the scent of the perfume encompass that much more of the small room. It was one of spice, and one which was almost overpowering - what with it not only being more than should have been applied but it also being placed on a filly. The distinct scent of cinnamon permeated the air along with the linen undertones. If any of Sweetie's peers were getting into those special years of a colt or filly's life... well, put lightly, Rarity would likely have to pray that the scent wore off by the morning, else she forced the white filly into the bath as if she were four.

"You know... you really could use some makeup to go with the perfume. You look pretty good already, but a bit of makeup could help your features stand out even more," Rarity said, gently petting the filly. "Of course I won't force you to wear it if you don't want to. But if we're bonding like this, we could try to get even closer that way."

"Sure!" Sweetie exclaimed in agreement again. "Can I put some lipstick on first? Like, um, like the color of Applebloom's bow?" A bit of (for now) natural blush crept onto the filly's face, but she still smiled, carefree as ever. "I wore one of her bows once, and I really liked the color!"

"Sure, Sweetie," Rarity said with a smile as she took out the red lipstick. "I'll put it on you, though. Don't want to overdo it," she said with a lighthearted chuckle as she removed the cap, before gently brushing it against the filly's lips.

Sweetie happily pursed her lips like she had seen Rarity do a hundred times before going out to have highball drinks with business executives or other members of high society - exaggerating the expression just a little, as a mare from one of any number of cheesy movies. The stick glided over her lips, painting them their beautiful red that was comically mature for Sweetie. Still, it certainly didn't make her look ugly. When her sister had finished, the filly did a kissy face at Rarity and giggled at herself.

Rarity chuckled a bit herself at how mature the lipstick made her sister look. "You look like you're getting ready for a date, darling... Are you seeing anyone?" she asked playfully as she put the cap back on the lipstick. She had a feeling that Sweetie wasn't, but some light teasing wouldn't hurt. And, if she was, then she'd just have to meet the lucky colt. Or filly, Rarity didn't judge. Especially not when everypony in her friend group had known how Pinkie and Dash felt about each other, even when they didn't.

Giggling again, but now red in the face from the personal question, Sweetie fixed her glance towards the mirror so that she might look at Rarity without actually looking at her - while also giving her red lips a good look. "...Pipsqueak is kinda cute," she admitted after a moment, blush reaching her ears. It was also true the filly harbored some mildly romantic feelings for her two closest friends, but she certainly didn't feel about that duo the same way she felt about the confident colt who always acted twice his size. "Okay, he's really cute..."

"I see. Maybe later I could give him a visit," Rarity teased gently, her amused expression growing wider as Sweetie gained a mildly mortified look at the thought of her giving the colt an interrogation. "But first, let's continue with the makeup. I think you could do with some eyeliner next," she said before the filly could respond.

"I- okay..." Sweetie submitted, following Rarity's gaze until the mare was ready with the tool. Sweetie closed her left eye. "Oh, should I close one eye?" She closed her right. "Or both?"

"Both, please. I want this to be a surprise for you when I'm done," Rarity said gently, as she applied the eyeliner, being careful not to accidentally get it in her sister's eyes.

As Rarity worked on Sweetie's complexion, the filly casually spoke of her crush, more comfortable with Rarity now that they were well into the bonding experience. "One time, my friends and I helped Pip win a school election. It was really fun. Hehehe... he was too short for a group hoofbump, so I lifted him up with my magic so he could!"

"Oh yeah. Wasn't that around the time you three got your cutie marks?" Rarity asked as she continued her work, deciding to add some light blush to Sweetie's cheeks as well. The filly's eyes now looked like hers, with the same blue on the lids that she likes to use. All that was missing now was a pair of false eyelashes, some mane dye, and a comb, and Sweetie would look like a miniature version of herself, like when they had tricked Trixie into removing that Alicorn Amulet. That was a day she didn't like to remember for the most part.

"Hehe, that tickles," the filly giggled, squirming just enough for Rarity to accidentally dab her sister on the nose with the blush. As Rarity worked to wipe it away, Sweetie gave a small nod. "Mhm! Same day!" she confirmed, recalling what a great day that had been. A few moments later, she grinned. "What are you making me look like?" she asked excitedly. "Oh, oh! Are you making me look like Fleur?" The filly's pronunciation was wrong, but it was true that it wouldn't take a lot of work to make the filly look like the spitting image of the high-society mare. And yet she remained completely oblivious to her growing resemblance to her older sister.

"While Fleur de Lis does have an immaculate face," Rarity said, emphasizing the proper pronunciation of the mare's name. "I'm actually making you look like somepony just as beautiful, if not more so," she giggled as she finished her work for now. "Go ahead and open your eyes, tell me what you think?" she asked, restraining more giggling as she spoke.

Sweetie opened her eyes as told, eyelids fluttering to gaze into her reflection, which was infinitely less horrifying than it was in the darkness of her sister's inspiration room. She murmured a quiet "Wooooow," turning her head to either side. Red lips, blue-lidded eyes, tinted cheeks. She... "I love it!" she cheered, turning to the mare beside her with a smile. "I kinda look like a little you!"

"Not just a little darling, a lot," Rarity said with a smile as she took out a comb and some mane dye. "Would you like to look even more like me? Or do you want to stop here? I'll be fine with whatever you choose, but I'd love to play with your mane a bit."

"Sure, I'd love to have a blue mane like yours!" the filly beamed again, horn lighting up and legs tensing with excitement. Soon, though, she was looking a little quizzically towards the shower. "Whenever you put that stuff on, aren't you usually in the shower..?"

"Yes, but that's usually because I apply it whenever I'm getting ready to go somewhere, so I combine cleaning my mane with applying the dye. But since we plan on spending the day here, we don't have to. But we could shower together if you want to," she added.

"I..." Sweetie stopped for a moment, suddenly embarrassed - but not why a mare might have been given the implications. "I've been kind of nervous about my first shower," she admitted shyly, rubbing one leg in a way similar to how Fluttershy would have (well, given a less permanent position...). "Would it bother you if we showered together..?"

"It wouldn't at all. I'd be glad to teach you how to shower properly. This will be the next step on your path to becoming a mare," Rarity said gently, lifting her sister up in her magic. "And I'm glad I'm here to see it."

Sweetie Belle smiled, blushing the slightest bit as she was levitated. "I can walk you know," she feigned in complaint, blowing a raspberry at her sister. "But... thanks, Rarity," she smiled, if sheepishly. "I'll be careful not to wash off the make-up!"

"Trust me, Sweetie Belle, it takes a lot of water to get this makeup off," Rarity said. That and it usually only comes off with tears, but she wasn't going to let her sister know that. With that, she reached over and turned the water on, making sure it was set to the right temperature. Too cold, it'd be uncomfortable. Too hot, and she'd look more like a marshmallow than she did already.

When Rarity had it just right and had lowered her sister onto the tub floor, Sweetie squirmed just a bit at reactions of both the heat of the water and- "It's loud..." she complained quietly, just barely loud enough to hear over the running water. Her head was lowered, allowing the front of her mane to quickly become soaked and the water to run down her face as she stood there half-frozen.

"Well they haven't created volume controls for showers yet," Rarity said, making sure Sweetie could hear her as she took the shampoo and squirted some into her mane. Before she could use the comb, she had to make sure her sister's mane was completely clean first. "Eyes shut darling, I don't want to accidentally get shampoo in your eyes," she said gently.

Tilting her head back so that the soap could have a chance to be scrubbed into her scalp, Sweetie obediently closed her eyes - not only because of her sister's advice, but also because of the water now striking the top of her face. "Let's get this over with..." she half-gargled, shoulders still taut with nerves.

As Rarity continued to scrub the shampoo in with one hoof, she used the other to start gently massaging her shoulders to get rid of her nervousness. "Darling, there's no need to be nervous with me here," she said gently. That was actually kind of true of herself as well. Even though she was never nervous when showering, somehow just having her sister in the shower with her made her more relaxed, and part of her wanted them to be like this forever.

Unbeknownst to the older unicorn, that thought was creating a feedback loop in her head, and the slight urge to hop in the shower to more closely assist her sister was planted. Sweetie, equally oblivious, simply took deep breaths - letting the hoof on her shoulder kneed away her stress. She eased into her sister's scrubbing. A soft sigh escaped her lips as she felt her nervousness slowly melt away and swirl down the drain.

Rarity licked her lips a bit before stepping into the shower behind Sweetie Belle. She wasn't sure why, but as she finished scrubbing her sister's mane, she wrapped the now free hoof around her, using her magic to help wash out the shampoo. As she did this, she subtly pressed herself against the filly. Something about being this close was feeling really good, and she had no idea why.

Sweetie Belle turned her head to the side, opening her eyes after the soap had finished washing down the drain. She smiled despite the confusion she felt. "This is a weird place for a hug," she giggled, "but thanks. I feel a lot better, Rarity!" In her excitement, Sweetie flicked her tail - consequentially (and unbeknownst to her) running the floofy tail against Rarity's more... private area. None the wiser, Sweetie held Rarity's leg close to her stomach, returning the hug as best she could, given her current position.

The sensation of her area being brushed like that made Rarity's breath hitch slightly as she tightened the hug. "You... you're welcome Sweetie Belle. But, you know... I could make you feel even better..." Even as she said this, though, a part of her was trying to fight against it. After all, doing THAT to a filly, and her own sister no less, was wrong... wasn't it? But if it did, then why did she want to do it so badly...

Curious, if perturbed by Rarity's odd disposition, Sweetie held her smile and tilted her head - holding Rarity's gaze despite the difficult angle. Her obliviousness rivaled what even Fluttershy's may have been in younger days. "Is it by making the water colder?" she joked, blowing a raspberry on the lower part of her sister's shoulder. "-Because you're REALLY warm!"

The sensation of her sister's breath against her seemed to shatter most of her remaining inhibitions. "No... not like that," she said, trying hard to keep a blush from coming to her own face. "There's something that people do when they're... really close. And we're close aren't we?" she asked.

"When you're hugging me like this!" Sweetie chirped, nodding happily. "Of course we're close, Rarity! Um..." An uncertainty swept onto Sweetie's visage. "You're not going to give me a noogie, are you..?"

"No... this... this is a different kind of touch..." Rarity said, subtly placing her hoof against her sister's entrance. Even with her inhibitions mostly broken, she was still hesitating a bit. "You'll love it, I promise."

Sweetie's shift was immediate. Squirming with the sensation, the filly's heart began to pick up speed. "What are you..." she started to ask, her virgin pussy's clit winking out and kissing Rarity's frog. "Ah!.."

Feeling the touch being reciprocated spurred Rarity on a bit, and she started gently rubbing her hoof against the clit, pushing in a bit. Some part of her was still worried about the scandal that would come out if anypony were to somehow find out about this.

Sweetie, feeling sexual pleasure for the first time in her life, gave another confused moan, unable to explain the warmth that began surging through her body. "Rarity... why am I starting to feel so... why does it..." She panted, eyes closing as her clit winked again. "I feel all... hot, but good at the same time!" she finally exclaimed.

"That... that is the power... of sex, my darling sister..." Rarity said, practically moaning herself at this point. "Your first time feels weird... but good... and it'll only get better later the more we continue..." At this point, she subtly gripped Sweetie's tail in her magic and used it to rub herself.

Consequently, Rarity's fluids wetted the floof of the tail and began to stream down it, eventually warming the radiant white ponut of her sister, who was then already a mess. Still, she held onto the slightest ounce of her sensibilities. "Isn't that- mmph!... what a stallion and a mare are supposed to do..? To make- ah!... babies..?"

"It... it is.... but... stallions can do it with stallions and... and mares can do it with mares..." Rarity moaned out, rubbing Sweetie Belle just a bit faster. "And it... it can... be done for more than just babies..."

"Do..." Sweetie struggled, the up in speed starting to cloud her judgment. As oblivious as it was. "Do families do it tooooo..?" she asked, dragging out the last word in a moan as for a third time her nub poked out to kiss Rarity hello.

"I... I don't know... Depends on the family I guess..." Rarity brushed her hoof against her sister's nub. "It's not polite in conversation to ask about one's sexual partners... but... I get the feeling that Applejack, Applebloom, and Big Mac do this a lot...."

Sweetie cooed in jealousy: "If Applebloom does this, then- ah - then I need to ask her about what it feels like with a stallion AND a mare!" She would giggle if not for the pleasure running up and down her body, tensing her shoulders and arching her back. The dull side of her horn rubbed against Rarity's chest floof, as the filly had straightened out. No matter if she couldn't see; she didn't need to. The feeling was plenty, and hearing her sister's voice made it complete. She drooled onto the shower floor needily, her clit poking out more regularly. The tip of Sweetie's horn grazed Rarity's neck, almost nipping her lovingly each time the mare intruded on her little sister. Such a naughty fashionista...

"While it isn't exactly the... the same, I do have... special toys that could provide a similar sensation to that of a... rod...." Rarity moaned as she pressed against Sweetie even harder, more fluids dripping from her. "Maybe... maybe when we're done here... I could use one on you... if you'd like..." With that, she tilted her head down and gently licked her sister's horn.

Sweetie Belle quivered as her big sister's tongue teased her horn. She'd played around with it before, but never had anyone licked it before! (Short of that incident involving Pinkie Pie and a LOT of icing.) Nothing like this at all - Rarity's tongue added a whole new depth to the pleasure. As though the hoof against her folds were now running against something even more sensitive. Sweetie was immediately lost for words. All she could do was nod her agreement, submitting to pleasure as her sex began to ache with a strange need.

The taste of her sister's horn only sent Rarity further into the arousal she was already feeling at this point, and she practically squeezed Sweetie's tail between her folds, covering it even further in her juices. At this point, she wanted nothing more than to just stay like this forever, the two of them pleasuring each other, even if one wasn't exactly fully aware of her part in it.

With this thought came not an urge of Rarity, but a sudden warmth not far from her own winking clit. Her crotch-tits had long since perked against Sweetie's rear, but now, they were beginning to feel... more disconnected from her. As though too warm to be felt. But while Rarity was beginning to feel a sense of disassociation, Sweetie was feeling much the opposite. Between loud sounds of pleasure, the filly struggled out, "Rarity! M-my other mare parts! They feel so, nff, haaaaard!!"

"Those... those are your... your crotch tits.... and they feel hard... when... when you feel good..." Rarity said, throwing her sense of being ladylike out the window. She cupped her sister's in her magic and rubbed them as she rubbed her own against the filly, moaning louder every second. "Do... do they feel good?" she grunted to her sister as she continued both of her ministrations.

"Y-yes!" Sweetie cried, bucking her hips back against Rarity's hoof. Her body was vibrating now. It was clear she was quickly approaching the inevitable. "And I'm starting to feel so... so..!" Sweetie's vocabulary lessons proved unfruitful. There was no word she knew to describe the ecstasy of her coming orgasm. Her first ever. The rubbing of her tiny, adorable teats only spurred on her pleasure - making it impossible for her to hold back the waves for long. Meanwhile, the mare on top of her, now rubbing Sweetie's tits like this, was feeling as though she were rubbing her own as well! Further, it felt like her crotch-tits were somehow "further away" than they usually were. But oh, how could she care! In these wild throes of pleasure, how could she have a care in the world! And with her sister on the edge of climax of all things!

Unbeknownst to the two of them, as Rarity rubbed Sweetie Belle even harder to bring her to the sweet bliss of her first orgasm, the filly was also slowly getting smaller. Not that either of them noticed, either because of the pleasure clouding their minds or something else entirely. But Rarity was focused on one thing, and one thing only, so she practically threw her whole body into helping her sister cum for the first time in her young life.

And at Rarity's whim, Sweetie's body did exactly what it needed to do. The added speed is just what Sweetie needed to let go and allow the dam to break. She came right then, her moan echoing throughout the boutique thanks to the reverberations off the water. Flurry after flurry, she climaxed on the opposite wall of the shower - stray drops here and there tickling the fur of Rarity's hind legs. By the time the filly weened off of her orgasmic high, her nipples had seemed to throb to become at least twice - no, thrice! - as large. And she could not help but rub them, unsatisfied by just her sister's magic. "That felt so... good..." she panted, stroking her sensitive tits - pleasuring both herself and the larger mare. A mare even larger than before. "I'm dizzy," she giggled, imagining nothing was wrong. She just shut her eyes and kept rubbing what she felt compelled to.

"That... that's perfectly normal darling," Rarity panted a bit as her own dam broke, arousal pouring over Sweetie's tail and down both of their legs. Sweetie's ministrations on her crotch tits made Rarity moan even louder, feeling as if those were her own being massaged. As she looked down, she noticed that Sweetie Belle was even smaller now. At this point, she was about the height of a five-year-old foal.

But the filly was none the wiser. She'd convinced herself easily it was just her vision warped by that fantastic feeling. And if it was touching her mare parts that made that come, then touch her mare parts she would. Groping her crotch tits, she moaned again. Little did she know that every touch helped her rear fuse to Rarity's crotch. The filly felt like she was walking on air! And that wasn't far from the truth; her hooves were dangling, scarcely touching the floor of the tub.

At this point, the fillies' hooves were starting to retreat into her body, making her look slightly chubby. Rarity started to notice this and was about to try to pull away, but something in her head told her to let this happen, so she closed her eyes and continued massaging her. As she did, Sweetie's body also got rounder and rounder as it continued to shrink, the feeling of where her crotch tits were centering themselves on the filly

Sweetie's neck was practically non-existent by the time she finally started to grow some concern about her situation. It only barely peaked over her self-ministrations, but it was there still. "Rarity..? Ah... hah..." she panted, still groping herself as her hind legs began to slowly merge with her flanks. "Is this... ah... normal?"

"I... I don't know Sweetie..." Rarity admitted, not letting up her ministrations. "But let's just... keep going... see what happens..." With that, she pushed her hoof into Sweetie's entrance again, wanting to use it a second time before it vanished forever.

As though already beginning to be affected by the changes over the rest of Sweetie's body, the filly's small vagina seemed to lack depth. Little more than labia on either side of a pink spot, housing still a sensitive nub. Yet even this was enough for Sweetie to feel great pleasure in addition to the growth of her crotch-tits, which had once more doubled in size. They were larger than the average mare's now, to say nothing of the size of her milk bags. But then again, they weren't really hers, were they? Oh well, they were hers enough for all her self-ministrations to spur her transformation on further. Her horn began to shrink, any chance of magic aiding her out of her predicament soon gone as her forehead smoothed over. But she didn't care. Not with how great her mare parts felt. With how good she felt.

At this point, Rarity finally caught onto what was happening. Somehow, her sister was turning INTO her crotch tits, making them much bigger than they already were. This was bizarre to her, but at the same time, it felt so right. Deciding to help her sister's transformation along, her horn glowed, causing her sister's tail to start shrinking into the rest of the body as she shrunk even further, her head practically sinking into herself at this point.

And poor Sweetie was left with the most awful of problems; her front hooves were merging in with her now! Yes, with her tail now gone, the rest of her body had followed, and she could no longer touch herself as she wished. And her fillyhood? It had all but merged with her then. What was left was but her clit, as though frozen in a wink. A cute little button. Just a press, and it too would be sealed away for all time. As her mane merged in with her head and the rest of her body - front legs completely entering into her form never to be seen again - Sweetie's eyes darted around. Half in panic, half in sexual need.

The desire won out.

She could hardly speak, her mouth now dripping with something more than just drool - but still, she had a request she deeply needed to give. Half-gargling her new contents of breastmilk, she begged, "Never... stop... touching... me..."

"N...never... Sweetie Belle..." Rarity moaned out as she pressed her sister's clit, sealing it away forever. With that, the filly was now permanently part of her sister. Even though she could still speak a bit and see, both of those things would be temporary, with the sight going away first. As the filly's eyes clouded over in pleasure, she caught Rarity's gaze one last time before blinking a few times, each one slower than the last. And, on the fourth blink, her eyelids practically melded to the rest of her face, leaving just the blue that had been added before.

Nostrils sealed over, cheeks rounded out, ears smoothed away... all left of the filly's old, inferior form was her mouth. It leaked milk in an endless sputter, and it too was beginning to seal to be a part of a proper carry-case for its new owner's lactation. Yet still, Rarity could hear it say one last thing. Whatever her crotch-tits said to her was unclear, but she made out at least one word. Love. And then, Sweetie's mouth closed forever, voice forever silenced.

"I love you too, Sweetie Belle," she said out loud, leaning down and kissing her now larger pair of crotch-tits. The only evidence at all that they used to be her sister was the cutie mark on one side, and the fact that they were a bit more vibrantly white than the rest of her. They felt so good on her, but now that one desire was fulfilled, she found herself with a new desire as she reached over and turned the water off for the shower. She had to give her milk to somepony.

Lucky for the improved mare, there was a quiet mewl as her pet cat passed the closed door of the bathroom. She was wandering about, probably waiting for her mistresses to be done in the shower.

"Just a moment, Opal, darling! Mama's almost done," Rarity called as she brought a towel over and dried herself off, moaning gently at the sensation against her huge crotch tits.

With every step - every sway of the hips - Sweetie Belle begged for release from her new owner. She needed to be touched. And oh how full she was... she needed to be milked. Oh, how she would plead if she could!

Even though she couldn't hear her anymore, Rarity knew exactly what her sister needed. "Just another minute or two, darling. Mama's gonna get you exactly what you need," she whispered as she hung the towel up and opened the door

The jiggly tits seemed to jiggle just a little more than usual on the next step, and the nipples perked, either in ongoing protestation or anticipation. Or both.

Rarity couldn't help but smile as she stepped out of the bathroom and looked down at her beloved cat. "You and Tank were getting along well while I dealt with Sweetie, right?" She asked.

Opal let out a meow of desire, looking towards her empty milk bowl and wholly ignoring Rarity's question. Tank, on the other hand, lifted his head as though about to "respond," but the moment he laid eyes on the mare's new honkers, he simply laid his head back down and sighed.

"Oh, Opal, darling, don't worry. Mama's gonna take good care of you," Rarity said, petting the cat a bit as she walked over to the milk bowl. She positioned herself so her "udders" were right over it and then, with great enthusiasm, started milking herself with her hooves.

Rarity's nipples immediately went from stiff to rock-hard as the filly within writhed with pleasure. Milk squirted from either breast almost effortlessly, and for Sweetie, every tug felt as exhilarating as orgasm. Even better. And at the same time, each one seemed to cloud her mind with pleasure as her milk shot down into the bowl for Rarity's darling Opal.

With each squirt, Rarity's legs twitched a bit, already feeling her arousal. "Oh... this... this feels divine..." she moaned out, tugging just a bit harder to get more milk out. At the same time, she used her magic to start rubbing her entrance a bit to help get more out of this. This only added to how good milking herself was feeling.

Sweetie was feeling likewise, yet she couldn't voice it. Not like she could though, even if she did have the mouth too. She was far too caught up in the feeling of being milked. Of doing what exactly she had been made to do. Opal and Tank were the only ones witness to the filly's cutie mark becoming just a little less vibrant against Rarity's milk-white breasts with each tug of her teats.

Opal was just staring at the mark with confusion, while Tank just nodded. With what had happened to his owner the other day, this was nothing new to him.

Unaware of how the two pets were feeling, Rarity tugged just a bit harder as the bowl continued to fill to the brim. It was about half-filled now, but her tits were still gorging.

The crotch-boobs swayed not just with Rarity's ministrations, but with the feelings they left the filly within with. Sweetie was practically being driven mad by the constant, unending pleasure. So much so that she was starting to forget what being a filly had been like. Her school lessons were the first to go - emptied from her mind by her sister's ceaseless milking of her new, engorged form. Her nipples quivered as Cheerilee was forgotten from the altering mind entirely.

After that, the next thing to go from the filly's mind were her friends. Wherever they were, they were probably fine was the last thing she thought about them.

With each thing Sweetie Belle forgot, the mark faded just a bit more and more. And Rarity felt her own pleasure increase further the longer this went on. At this point, she was starting to cum a bit, her juices mixing with the milk.

As Rarity's juices ran down her crotch and dripped from her breasts, they jiggled slightly with excitement, wriggling in their growing pleasure. A pleasure that only increased as the former filly drew a blank on her name. Something starting with a... oh, it didn't matter. Breasts don't have names. Nor hooves, which she had long since forgotten how to use. Nor eyes, nor mouth nor ears. All things she didn't need when she was right here where she belonged. With her cutie mark more than half faded from the world, the breasts jiggled with the thought of being nothing but what they'd been turned into - as though a part of Rarity's sister knew she was losing her mind, and graciously accepted it. Spurring Rarity on, even - milk dripping from her tits even between tugs.

The more milk that fell, the smaller they got - for now. They were still pretty impressive-looking, but they weren't as gargantuan as they were at the start. But there was still a bit more milk to go, and the encouragement she was feeling only intensified the intensity of her tugs, causing her own pleasure to intensify even further, the cum dripping harder down her legs. The next thing to go from the filly's mind was her knowledge of who their parents were. It wasn't like they were around that much anyway, so being with Rarity like this forever was much more preferable.

Forever. That thought echoed through what little was left of the filly's mind. No, no... not filly... Had she ever been a filly? Not that she could recall. What a silly thought! The tits jiggled as the cutie mark upon them threatened to vanish entirely. She was nothing but a pair of boobies, jiggling and wiggling with every sway of her owner's hips. With its owner’s hips. The pair of breasts faintly recalled that its owner was its sister, but even that was beginning to fade. What did it matter? As long as she could feel like this Every. Single. Day. Still, the fleeting thought brought with it a moment of happiness, and the nipples twitched almost lovingly against the frogs of their owners' hooves. Begging her to finish it and milk away the last of their meaningless mind.

Feeling the eagerness of her former sister, Rarity gave a few more good hard tugs, and, soon enough, the last of the milk that was in them poured out at the moment. The sensation sent her over the edge, and cum no longer dripped from her. Instead, it practically exploded out of her, covering the area around the milk dish. With that, the rest of the filly's mind vanished with the mark, never to be regained again. And, as Rarity sat on the floor near the dish panting a bit to regain her breath, she knew this was how things were meant to be for the two of them. "Thank you, Sweetie Belle, thank you..." she muttered, a smile on her face. With that, she looked over at Opal and nodded. "Your milk is ready, dear."

Chapter Two - From Pussy to Cock

As Opal’s mistress sat there in her afterglow of milk and cum, nipples twitching and rightfully free of any thought process of their own, Opal cautiously approached the bowl. Her curiosity was piqued, but how could she refuse her hunger? With a meow of thanks, the cat leaned down to drink from her bowl - tongue blepping in and out and so that she might sate herself with the mixture of the marshmallow-flavored milk and the proper fatty milk it had transitioned into as Sweetie's mind was milked away so smoothly. That, and the cum that had dripped down into the bowl. Opal certainly seemed to enjoy the sweet mixture, given the pleased smile on her face as she lapped up the contents.

As the cat drank it up, Rarity smiled a bit at how cute she was looking. Unbeknownst to the two of them, this milk was special in more ways than one. At the moment, though, Opal just continued to lap the milk up, purring in contentment at the feeling of her hunger being satisfied. As she did, she started to feel a strangeness near her rear legs. This was similar to that of heat, which was something she hadn't felt in a while. For now, it was just dull enough that she could ignore it, continuing to drink up the milk.

However, what couldn't be ignored was the scent beginning to emanate from her sex. For now, it was not so strong as to draw her attention away from her appetite, but it was certainly enough to draw the attention of the tortoise, who would be more than happy to oblige her body's need. The tortoise slowly made his way behind the cat, quietly inhaling Opal's scent to be acquainted with his mate if she didn't strongly protest. To test the waters, Tank leaned forward just a little more and flicked his tongue against the kitty's little clitty.

Sure enough, this got the cat's attention and she pulled her head up from the milk dish, letting out a startled meow as she turned her head to look at what the tortoise was doing. Her expression was a mix of annoyance at being interrupted and curiosity as to why he did that. However, she did not try to pull away from him, just staring a bit to see if he'd do it again or let her get back to her milk for now.

Giving a teasing look, as though to say "Oh, did you LIKE that?" the tortoise held Opal's gaze for a few moments before letting his tongue lol out his mouth again and lap once at Opal's folds while he looked into her eyes.

She let out another meow, but this one had a bit of a moan to it. At this point, her expression now shifted to one that said, "You'd better keep going." And, at the same time, she felt her heat start to intensify, the smell coming off of her getting stronger.

Urged on by both the pussy's insistence and her pussy's insistence, the tortoise teased her by withholding for several moments - exaggerating his slowness. His tongue slowly crawled up the cat's folds from clit to the pinch of skin between pussy and anus. The latter he laid a kiss on to tease the pet.

She shivered a bit from the pleasure the kiss made her feel before pushing against him, starting to get a bit impatient. She knew he was pretending to be slower than he really was, and wasn't having it. At this point, the smell emanating from her was strong enough that Rarity could smell it as well, even if it wouldn't necessarily affect her as strongly as the two animals

Tank obliged her more obediently, giving Opal and himself both a better taste of what they wanted. The tortoise's tongue slathered the edges of Opal's labia before, with little warning, he drove the wet muscle into her and licked all around her inside - hungrily licking at her bestial fluids.

She let out another loud pleasured meow at the sensation of his tongue against her insides, body twitching a bit as more fluids dripped from her. But the more he licked, the more she felt the need to be filled with a different organ of his, so she let out a mewl, letting him know her desire.

Who was Tank to deny her? He swiftly extracted his tongue from her insides and gave her nub another kiss before promptly mounting her, his animal cock prodding her entrance. and teasing her cruelly.

She meowed in distress at being teased like this, pushing herself against him. She hadn't admitted this to him before, but ever since they met back during Dash's contest to choose her pet, she had developed a bit of a crush on him. But even so, she'd never imagined a day like this would come.

Tank had never admitted it, but he too for a long time had harbored a desire to be with Opal. And now that he had his chance, he leapt at it as best a tortoise can. He thrust into her, binding their love together as he squeaked out a moan of pleasure. The tight confines of the cat were far greater than the tortoise could have possibly hoped for.

Opal let out a pleased meow at the sensation of his cock inside her, rolling herself against him. This felt better than she could have ever imagined, and she hoped this sensation would never stop. And, thanks to the special milk she drank just a few minutes ago, that desire was about to be met.

Tank hilted quickly within his crush, his hard shell kissing her anus as he groaned in sexual desire. He began to hump, soon with wild abandon. He was too absorbed in his gratification that he didn't notice when his testicles began to swell. He didn't know it, but Opal's legs were beginning to lift off the ground and fuse with her changing haunches.

Opal, too absorbed in her pleasure as well, didn't seem to notice this either as she bounced herself against him in time with his humping. Each thrust made her meow louder and louder, some of her juices starting to release around him. As this happened, her legs continued to recede into her body. At the same time, the rest of her was starting to shrink a bit as well.

As the bell around the cat's neck got looser and looser, jingling a little less with each thrust, Tank fucked the cat's legs away until they were merely a sack with the lightest patch of snow-white fur. He continued to hump, yet he couldn't so much feel her tight cunny's insides. Unbeknownst to either animal, the rocking of his hips was now righting the arrangement of the cat's insides. Smoothing her out and creating a proper inside for the new form she was about to take.

Rarity, watching this display, was a weird mix of mildly disturbed and also really curious. With what had happened between her and Sweetie Belle just a few minutes ago, she figured that if this was happening, it was meant to. She had no idea it was because of her milk, not that that mattered anymore.

Opal continued to rock herself against him, desperate to get his cum to fill her. At the same time, she felt her tail start to retreat into the rest of her body, moaning in pleasure at the sensation. As they continued their combined humping, she felt her fur start to fall off a bit, exposing herself to the cool air of the building.

Before the cat's tail vanished completely, the last of its nub ran against her asshole, sealing it shut forever as the tail too merged permanently into her body. As the cat's fur began to fall away slowly, starting at the base of her crotch and sloughing off her body up from there, Tank began to moan regularly - his cock feeling much more sensitive than before. He was fairly certain he knew what was going on, and he allowed himself to enjoy it. He encouraged Opal to change - leaning down and rubbing his cock against the carpeted floor, rubbing off her fur to reveal smooth, white, phallic skin beneath that already was growing veins.

While she still could, Opal let out a few meows of pleasure with each rub, her pussy feeling more and more sensitive by the second. At this point, the only thoughts running through her head were about how good this all was feeling. By now she was aware that she was changing, but she wasn't sure why or how. And, overwhelmed by the pleasure, she didn't particularly care. All she wanted was to cum from her cunt for at least once before whatever was happening finished, so she wriggled against him the best she could with her remaining mobility, feeling said movement slow down the further the transformation went along.

Although perhaps completely by accident, Tank allowed Opal to feel the stimulation she craved, as he began to teabag the floor. Balls rubbing against the carpet, and Opal's shrinking pussy stroked by the fibers with each and every thrust. The tortoise did this so long as his catty cock continued to sing her sounds of pleasure - though those were quickly being met with the sounds of bubbling gurgles as something began to leak from Opal's mouth, leaving as wide a trail on the carpet as did the wet and needy folds of her sex.

To Opal's mild surprise, what was leaking from her mouth wasn't drool, but cum. Cum that had to have been from the tortoise she was currently merging with. She let out one last meow of pleasure while she could, feeling her mouth start to shrink and tighten up, becoming the slit of a cock in the process. At the same time, her pussy continued to leak until it sealed up permanently around Tank, preventing her from moving further. But she was loving what was happening, so she couldn't particularly care.

All that remained now were two adorable cat ears, a pair of eyes, and the fur covering the tip of the penis. The last of Opal's visage, threatening to fade away at any moment as Tank went back to jerking himself off with the carpet. Every rock of his hips felt a little more sensitive. Assured him and the former cat that this was right in every way. He began to draw close to orgasm, knowing that would seal Opal's fate and make her part of him forever. He felt just how much she wanted to do that, so he didn't slow his thrusts. Not in the slightest. He wanted to ruin Rarity's carpet with the first of many mind-shattering orgasms the new sex organ would be feeling from that day forward.

Opal, encouraging this, twitched herself against the carpet as best she could, mind overloaded with bliss. Her ears were next to go, flopping against her head and merging with it, sealing off her hearing forever. If she could, she would have looked Tank in the eyes. Part of her was mildly disappointed that she couldn't give him one last glimpse, but most of her didn't care thanks to the bliss of the situation. As this happened, her memories started to go a bit as well. The first thing that she forgot was that she had a different owner. In her mind, Tank was her only owner ever.

As Opal's transformation continued its march to its inevitable conclusion, Rarity thought back to how Dash had looked when she stopped by earlier that day. Knowing what had happened to Pinkie, she realized that the bliss her soon-to-be former cat was feeling must have been how the former earth pony had felt when her change occurred.

Feeling Opal sink further into cockhood, Tank happily helped the cat by humping away more and more of her memories. She didn't need to remember anything when she was a cock. Just needed to feel. Experience the world pleasure by pleasure. The tortoise bent his knees to lower himself closer to the ground. The carpet now not only grazed his new package of baby batter, but instead his balls whapped against the floor - drawing his cock's orgasm closer. Closer...

The next memory to go was her name, as the former cat moaned internally, the only way she could. Cock's don't have names, after all. She felt her eyes close one last time, sealing shut forever as the world was engulfed in darkness. But this was fine, she knew she'd be okay as she felt herself fill with more of Tank's cum, some more pre drooling from the slit where her mouth used to be. She twitched and quivered with need, feeling so close to release.

As his new, perfect cock pulsed against the carpeted floor, Tank knew it was time. Closing his eyes and gritting his jaw, he fucked the floor with wild abandon, telling his body to do what it deserved to do. Told it to make Opal let go of herself and be what it deserved to be. A cock. Nothing more, and certainly nothing less.

As the cock let go of whatever memories it had left, not even bothering to keep track, it twitched hard as cum started pouring out of it, leaving a massive stain on the carpet, one that was growing bigger the more the orgasm went on. And the cock loved every second of it. Why wouldn't it, when this is what it was meant to do?

The last of the former cat's fur fell away, signifying the loss of all that used to be her, save the white shade left now upon the tortoise's member as he orgasmed onto the floor. Yet he continued to rub himself out, riding out his climax and making sure Opal came away all her worries, all her responsibilities - until she was nothing but his throbbing meat - dripping the last of her old self out and becoming his cock forever. The tortoise slumped to the ground, slathering the cock in its old life almost teasingly.

The cock twitched with remaining pleasure as it flopped about in the remains of what it used to be, happy with the life it now led of being just part of the tortoise.

"Well, that was a sight," Rarity spoke up. "I'm not going to lie, I'm going to miss my darling Opal, but I know she'll have a wonderful time being part of you, Tank. Just like I know that Sweetie loves being part of me," she said, lovingly rubbing her former sister.

Not that Sweetie was so much there anymore as she was milked away into pleasure, effectively breastified, but the nipples twitched against the mare's touch - always, always begging her stimulation. Daily milkings would be a must with her new crotchboobs. Let alone the wardrobe edits she would have to make. Meanwhile, Tank simply sighed, tiredly humping the ground until his new cock was fully flaccid and awaiting its next use.

She was looking forward to milking herself each day. Perhaps she'd make it part of her breakfast. And while it would be a bit lonely without being able to actually talk to her sister or cat anymore, she had a feeling things would be just fine.

Chapter Three - Testing the Milkers

"Well, I think today went VERY well," the unicorn said to the tortoise as she sat on her couch.

Following her despite his sexual exhaustion, Tank climbed up onto the couch with the mare, smiling and giving "Sweetie" a kiss on either wet tit.

Rarity let out a light moan herself at this as she gently rubbed his head. "Thank you, Tank. That's wonderful of you."

The tortoise looked up, flexing his brows at Rarity in a suggestive manner, as though offering his sexual service to his temporary pet sitter.

Rarity smiled at him as she adjusted herself, turning her body so that she now laid on the couch, giving him easy access to her crotch tits.

The tortoise moved to oblige Rarity's mirrored desire, poising the tip of his quickly recovering cock at the entrance of the white valley of Boob. He had Rarity mounted like that, and he gave another kiss to either of the precious, perky mounds.

Rarity felt her tits twitch a bit in pleasure at the kisses. "Go on, Tank, use my dear Opal to please Sweetie," she encouraged. They both knew that using the names at this point was unnecessary, but it felt comforting for her to still use them.

Tank grinned, giving the mare a knowing smirk as he slowly slid his erect cock between the impressive assets. White against white, soon to be covered in even more white. Very soon, as Tank was already opening his jaws wide and accepting one of the nipples into his mouth - soon sucking on the mare's new breasts.

Already, a bit more milk was starting to come out of the nipple, causing Rarity to moan loudly. "Oh my.... that... that feels divine... keep it up darling," she said. Normally she wouldn't dream of having an animal down there, especially not a tortoise. But with the kind of day she'd been having, pretty much all of her limits had been pushed aside, and now she was open for anything.

Tank could only happily do as Rarity asked, opening his mouth wider and letting the nipple into the start of his throat as he sucked down more of the fatty milk. No more marshmallow, no more worries. Just a needy tit leaking its milk. The white cock was withdrawn and then placed back, Tank slowly thrusting in and out of Rarity's crotchboobs.

"Mmmm..." Rarity pumped herself back and forth in time with Tank's thrusts, feeling more milk leak out each time, making the already white cock even whiter. They'd barely begun, and she was already feeling amazing. She'd have to convince Rainbow Dash to let her petsit Tank more often. But that was a concern for later.

Tank switched nipples when he'd gotten bored of the first, picking up the speed of his humps as he sucked down more of the fatty nectar of life. A small part of him envied the jiggly tits and the hot cock concealed from his view - but being "on top" like this was much more satisfying for the wise animal. His shell whapped needily against Rarity's boobs, the milk jugs quaking with each slap-concluded thrust.

The harder Tank suckled, the more milk seemed to come out of the tits. It seemed like they'd never stop producing at this point, but Rarity wouldn't complain about it even if she had the mental capacity to. Right now, however, she was just giving herself to the pleasure of what the tortoise was doing, feeling some cum starting to slip from her pussy as a result of the pleasure his ministrations were giving her.

Tank swallowed dollop after dollop of the rich, creamy milk - moaning gently into the pliable flesh of the breast. He was doing that regularly now, the warm milk and hot flesh working together to pleasure him more than even his former crush's folds had. Of course, the sensitivity she had given him was a great factor in that. No matter - one way or another, he was fucking his sitter's tits with primal desire. He felt the compulsion to blow his seed on the mare and make the wonderful boobs all sticky and hot with his animal cum. As though a distant to thank you to both Sweetie and Opal for their grand contribution to the sex life of both pony and tortoise alike.

Feeling Tank's cock start to twitch, Rarity wriggled herself even harder than she had already been moving, desperate to get him to cum. "Do... do it Tank! Cover me in your juices! Make us both feel divine!" she begged, feeling on the verge of another orgasm herself, but she was holding back as best she could, wanting them both to feel their maximum pleasure at the same time. If she had known what this was like, she'd have insisted on making it so she could try it beforehand. She still had no idea what caused all of this, but she had a feeling she'd get a few answers soon. Either way, it didn't matter. What mattered was getting that sweet, sweet cum on her milky white breasts.

With a final victorious thrust, Tank sucked hard on Rarity's tit, swallowing a great gulp of the fatty milk and pushing Rarity off the edge with him. His quivering cock gave out, and he blew his load in between Rarity's breasts - its stream blocked by their fat. His seed messied the mare's crotchboobs' valley wonderfully. A river of cum and milk, fur stained and sticky and gloriously decorated by the cumshot and milking alike.

At the same time as he came between her breasts, Rarity blew her own load, her juices mixing with his cum and her milk. She had never felt this kind of pleasure in her life, and she was looking forward to feeling it again later. She'd have to shower again later, but for now, she just gave herself into the pleasure of being covered in his cum and her milk. "This... this is so.. amazing..." she moaned out as she came.

As the former cat was soaked in her former mistress's milk and the new salty substance of her permanent form, the cock mindlessly twitched between the breasts, enjoying its bath as its owner opened his mouth and let the nipple go free - thoroughly swollen from all the attention. He slumped against Rarity, kissing her stomach sweetly after their romp.

Rarity tiredly wrapped her hooves around him in a hug, letting him know just how much she appreciated what he had done for her. She closed her eyes to try to get some sleep for now, but this was interrupted by the sound of a familiar scratchy voice.

"Well... I missed a lot," came the voice from a certain prismatic pegasus.