Chapter one: Spoiled beginnings
"Fluttershy! Where is that sandwich I ordered? I've had to wait for nearly five minutes on you."
This had happened often for Fluttershy; first, she would be ordered to do something by her Mistress, then she'd be chastised for not being fast enough. "I-I'm on my way, Mistress. It'll be delivered." Fluttershy powerwalked through the hallway to Rarity's lounge room, seeing her sitting on a lawn chair outside the enclosure connected to the lounge room. "H-Here you go, Mistress. I'm sorry for being so slow."
"You should be, Fluttershy. Goodness, me, making a sandwich is honestly not that difficult that it should take five minutes or more to do." Fluttershy gulped as she saw Rarity's posterior sitting on the lawn chair. Thankfully, Rarity was too busy eating her sandwich that she didn't notice Fluttershy ogling her rear. The legs of her chair were slightly wobbling from supporting her rear end. She was chubby but not obese. Her chest was easily cantaloupe-sized, big but not huge.
"Fluttershy, darling, what are you looking at?" She just noticed Fluttershy staring at her rump as Fluttershy quickly tried to evade the question, "Fluttershy. I am waiting for a response. Were you staring at my butt while I was eating?" Fluttershy was frozen stiff from fear; this would end horribly for her, and she knew it.
"Y-Yes."
"So you confess? Then what is it about my derriere that is so marvelous that it warrants you staring at it?" Fluttershy knew she had to tread carefully here; one mistake could be her last if she weren't careful.
"I-It so... so big." She quickly covered her mouth in shock, "Oh no, that came out wrong; I didn't mean to say that." Rarity glared at her over her shoulder until her glare went from furious to smug.
"Big, hmm? Is that all you have to say about it, darling? Do keep going."
"W-Well. It's so big... and p-plump."
"Big and plump, you say? Hmm. Then how about I help you with appreciating my divine derriere?" After finishing her sandwich, she stood up from her barely stable chair, showing signs of wear and tear from being warped by her butt sitting in it.
"Oh no, you don't need to do that, Mistress. It's fine. I won't stare at you anymore, I promise."
"Oh, but I adore a standing ovation, darling. I suppose you wouldn't be standing when you're under me." Each sway of her hips made her asscheeks swing and bounce around like two soft wrecking balls as the shadow of her rear was now looming over poor Fluttershy's face as she stared up at Rarity's ass in shock and horror.
"M-Mistress, please... do not sit on me." Fluttershy saw her blushing; she wanted to do this, and nothing would stop her from getting what she wanted. "Oh no..."
"It won't be so bad under me, darling. I think anyways. I guess that depends on you, doesn't it?" She sat down onto Fluttershy and felt her face sinking into Rarity's supple rump as she panicked. "The queen claims her throne; how lovely. Oh? You're a feisty one, aren't you, darling? Won't do you any good, I'm afraid. So long as I'm sitting on you, you'll not go anywhere."
Fluttershy tried to breathe, but her breaths were shallow when she was so deep in Rarity's butt. "Admire all this for me, darling, why I can't blame you for your indulgence. You should feel privileged that you are this close to me." As Fluttershy's nose grazed deeper, she noticed the unpleasant smell of Rarity's rear end. "You're speechless; I understand, darling. Then keep massaging me right... there."
She whimpered as she tried but failed to dig her way out of Rarity's rump. "Mmm... not too shabby, darling. At least you're good at doing something. It would be best to work on your punctuality, which certainly needs improvement. Then let this be a lesson for you, darling." that horrible ass fat was gradually squishing outward like pliable dough before it came back in every time she tried to wiggle to get comfy. "Try to bend the rules by slacking off on your duties; get bent underneath me. Yes, that seems to be fair enough to me."
Then, the butter pegasus had given up on trying to free herself; she knew how frivolous that would be. "Now, as I gradually put you to sleep under my butt, darling. Use this time to think about your poor performance recently. You disappoint me, Fluttershy, darling, you do. But I suppose I can gain some gratification from you yet."
"Oh darling, please, you whine as if this would be your execution. It is no such thing, darling. If you want a job done right, you must do it yourself, so I'll discipline you just fine, darling." Fluttershy's poor snout then grazed Rarity's pungent butthole, and she was lightly convulsing under her. "It wouldn't be so painful if you didn't squirm so much, darling. But as for me, I can do this all day."
Fluttershy was getting weak as sleep threatened to take over her synapses. The smell did not make it better for her at all. "Honestly, it's so difficult to find competent help these days. I try to be patient with you, darling, but this was my only recourse for you to learn to pick up the pace." The butthole kissed Fluttershy on her snout, "You promised me you'd be a hard worker, darling. I do not appreciate being lied to, not one bit."
This was getting bad; any longer, and she would be knocked out cold. Fluttershy then tried to beg; her whining was like pleading for mercy. "Eventually, you shall learn your place, Fluttershy, darling; I know you will." Her stomach gurgled as Fluttershy wiggled more, knowing what that meant for her. "Ah, so you know what will happen next, huh? Then you should do everything you can to avoid this next time, should you not?"
Anything but this, Fluttershy would do anything for her Mistress; please don't fart. She was trying vainly to struggle as she couldn't speak without sounding muffled; silence was the best answer for someone who did not value her words. "Oh, and let me tell you, darling, brussels sprouts and spinach make my flatulence nothing short of lethal."
She grunted as she blew out her first bout of gas in Fluttershy's face;
Bbbrrpptthh!
A foul and haunting green mist billowed out onto Fluttershy's poor nose. She was internally begging for mercy. This wasn't very pleasant. Her gas was very veggie-like in the choice of food she ate. "Ahh~ be sure to whiff that in, Fluttershy darling. It was brewed specially for you." Fluttershy's breathing was faint until she calmed down into a gentle sleep before too long. Rarity had successfully knocked her out. "Yes, I expect better from you next time, darling."
There was a ring on her door shortly after she knocked out Fluttershy. "What?! I did not plan on having any visitors today. What is the meaning of this intrusion?" Rarity stood up as she felt Fluttershy's face still trapped in her butt and grinned lasciviously for a moment before walking over to the door and quickly putting on a dress, making sure to hide Fluttershy's body in her dress. "This had better be good, or so help me."
She opened her door to see a lavender mare standing there with what looked like tattered rags covering her. She, oddly enough, looked too well groomed to be a beggar; she knew the difference with a simple observation. "What do you want?" Her tone was anything but amused, however.
"Food, water, hospitality, please. Where I came from was a very terrible place. Mares like us are treated with much contempt for our lesser status."
"Well, that's too bad, darling. I have neither spare rooms for you nor any food for you. If you want water, there's a faucet on the side of my manor, darling. Be thankful that I'll even allow this for you. Take some water and then get off of my property." Rarity then slammed the door in her face as she trotted off. "The nerve of some ponies, coming here just to beg me for free food and hospitality."
"I will make sure you regret this selfishness; you will be forced to become humble like me, do not think that I did not notice the little servant you were torturing. With this spell, you shall be merged with that you despise, from hubris to humility; your arrogance shall be purged. You will see how it feels to be burdened like we are." The mare then lit her horn and weaved a spell for Rarity to warp her body.
After roughly a few minutes since slamming the door in that mare's face, Rarity suddenly came down with vertigo; her head was spinning, and it ached. She was propped up against the manor wall for support, and her body was heating up like a fever, "w-what's happening to me?" then she collapsed just as fast as she felt ill.
After a few hours, she woke up and felt something was... off. Her entire body was taller, and she felt bigger in her chest and rear; her body wasn't white as it used to be, it was now a butter peach color, and she felt gentle breathing to her left side and looked in that direction to see Fluttershy's head still sleeping. She then looked at the rest of her body and realized they were merged.
She tried to hold in shock so she didn't wake up Fluttershy as she thought about that mare at the door some hours ago and scowled. That mare was the cause of this; she just knew it; she saw her horn glowing right as she slammed the door in her face. Fluttershy began to stir as she felt weird, too. "Mmm... that was a lovely nap. Umm, Mistress? Why are you so close to me like this?"
"Look. I can explain, darling. But you must promise me that you will not freak out, as it were." Fluttershy then noticed that they were both merged, and she began to panic. "No, no, darling. It is fine; I'll find a way to reverse this. Somehow." Fluttershy then realized that they were both merged and their heads were on either side of each other. "Yes. I know this looks bad."
"This is terrible, Rarity. Oh, goodness. I was never this overweight." Fluttershy curiously poked her merged stomach as Rarity huffed in annoyance.
"Oh, please, darling, having a little chub on you isn't kill you. I'm fine with it."
"B-But I feel so much heavier than normal, Mistress. It feels wrong."
"You will grow like being a bit thick in the right places, my dear. In fact." Rarity blushed as she lit her horn to massage her magic on their merged pussy as Fluttershy moaned uncontrollably. "Aww, am I making you whine, darling?"
"Oh, goodness me. Stop that, Mistress. It feels so... aaauuuhhh~ Oh my, that feels nice."
"You sound like an angel when you're horny, darling. Did anypony ever tell you that?"
"Y-You're such a cruel tease, Mistress. Oh my. It feels like I'm going to b-burst."
"Don't you mean we'll burst, darling?" this felt satisfying for her. Rarity didn't mind being merged with her servant. "That mare that cursed us, I shall let her in and then show her what happens when you curse nobility. You'll help me, Fluttershy, darling, won't you?"
"D-Do I have much of an ooohhh... a choice?"
"No. Not really, no. Just imagine how good it feels to be one with your Mistress, darling. To be thick, powerful, and sexy like me." Rarity was nearing the edge of her orgasm with Fluttershy as he could barely hold on against it. "Yes, now we shall.. aaaauuuoohhh. Oh my god, that felt simply amazing, Fluttershy, darling." they both came as Rarity felt temporarily sated, and Fluttershy felt intense pleasure that she never thought she'd experience.