The days cycled on as Twilight Sparkle remained in the clutches of Lilly Sweet; growing ever more fatter and Lilly siphoning both the Alicorn’s lust and magic. A terrible fate if not a pleasurable one for Twilight. Everyday drinking that sweet tailmilk, swimming in warmth of her expanding body and experiencing sex like she could not even weave into imagination and the fourth night was no different.

Twilight suckled Lilly’s tail greedily, her plump cheeks bulged as she received cups worth of tailmilk, its taste just as delightful as the nights before. She gulped down every offering she received with the same vigour she had for the first time, moaning at the familiar warmth it gave her body and the gentle stretching of her skin as pound after pound expanded her massive frame. The queen-sized bed squeaked at the growing mare’s bulk rested on her side. Despite the pressure, the bed hugged Twilight’s form with nary a strain on its legs, yet it was running out of space to fit the Alicorn. It was not a concern for the demoness, right now. Behind Twilight, Lilly Sweet licked and suckled the Alicorn’s magical horn. She already finished her feast on the princess’s magic and lust -- the glowing sphere between Lilly's white horns attest to that. All she was doing now was just giving her pet the elation of her horn being tickled by her tongue as it slithered and lapped from the base to the tip of its length. Lilly tasted the sparks of magic that reacted to her teasing and her ears perked at the happy mewing her pet let out. Lilly pressed in deeper to Twilight’s flabby back. Her ample bosom rubbed the soft feathers of Twilight’s wings as Lilly grind into the soft flesh in anticipation for tonight’s ‘fun’.

Twilight let the tail slip out of her mouth. She sighed happily, satisfied at her latest binge. Her head sinked into the many folds of her chin and neck fat like they were cushions. She purred as she felt the hot breath of Lilly tickle her ear.

“What shall we do tonight, my pet?” she whispered into the mare’s ear, the arousal deep in those words that even Twilight's addled mind could detect, “Shall I give your precious flower a lovely pounding?” Lilly’s tail-spade nudged in and out of those swollen lower lips. “Or shall I milk your massive tits?” Twilight yelped as Lilly mare-handled her purple beach ball tits; they sloshed and oozed out from Lilly’s grip, filled to the brim with milk. “Or do you have something else in mind, my clever pet,” Lilly chuckled at all the debauchery the Alicorn could come up with. Oh, how it made her hot at just the thought of it.

“Cuddle,” Twilight Sparkle sang out.

That was… unexpected.

“C-c-cuddle?!” Lilly managed to blurt out, her face awash with shock, disbelief, concern, amusement-- why only cuddling?! At this stage of being enthralled to a demon of desire they would be begging for an endless orgy, not cuddling! “A-are you sure?” she asked to check this was not a tease. Twilight's response was a kiss. The kiss itself was not tongue fighting, mouth eating ecstasy, but an affectionate peck on the lips, another surprise for Lilly.

When Twilight broke the kiss she said, “Yep. You give the best cuddles,” she rubbed her bloated cheeks between Lilly’s, “you’re so warm and gentle.”

Lilly went slack jawed. She was at a sheer loss in how to respond. She could just force her to accept a good rump, yet for some reason, cuddling did feel better... But she really wanted sex!

Dammit, why do you have to be such an adorable little thrall!??

Lilly sighed, “Okay, my pet, I’ll give you the best cuddling you ever had,” she moved her arms between Twilight’s breast and gut, feeling the weight and heat between the two. She started massaging the belly in circular motions and rub her torso into Twilight’s back. Lilly then settled her face between Twilight's pillowed one. She felt the vibrations of the Alicorn’s purring at the treatment she was receiving. It felt… nice. Having her here was quite productive for her. It was a shame she could only keep the princess here a few more days before anypony would notice her absen-

“SUCULA!!!!”

uh oh.

SUCULA! WHERE, IN THE REALMS OF TARTARUS, ARE YOU?! The voice that was the embodiment of fury echoed through the cavern walls. For Lilly, however, the hot fury was an icy chill cutting upward through her spine. If her brother was using her true name then he is clearly not happy with her. But why? The harvesting was not behind schedule and He doesn’t know about the Alicorn being here, at least until now, she guessed. Lilly's eyes snapped to Twilight who was quivering from the sudden outbursts. Did taking her reveal them? But why now? If Twilight spoke the truth they should not be looking for her now.

“SUCULA!!” Lilly winced. Instinct told her to take Twilight and run, but instinct forgets how adept of a hunter her brother is. She gave Twilight a quick peck on her chubby cheek and leapt out of the bed and made for the hallway, as she walked, her horns glowed and wisps of maroon magic surrounded her body and solidified into a bra and lower robes of the same colour. Now presentable, she needed to find her brother and reason with him over whatever he was furious about. As luck would have it - more like unluckily - she did not have to look for him. Once she entered the hallway to her left there stood her brother: Eros.

Eros closed the distance to Lilly. His indigo face scrunched like a bull charging at his victim. Even his inward horns glistened with murderous intent. His green bloodshot leered into Lilly’s feared ones.

“Of all of the stupid, reckless actions you’ve done, Lilly,” he started, his fists tightening as he tried to hold back from screaming at her; he failed, “KIDNAPING A PRINCESS?! A BEARER OF HARMONY?! WHAT IN THE HELLS WERE YOU THINKING?!”

To an unknown spectator, Eros’ limber frame facing the voluptuous Lilly would be an amusing sight to watch. But Eros' power did come from his strength, rather his intelligence, strategy and influence in the underworld clans made him a dangerous demon to cross -- even if one was a sibling to him. Lilly knew if she did not play the game of persuasion and reason well… she dare not think of the punishment.

“B-brother,” she tried to maintain her cooing voice, but Eros’ sea of bloodshot eyes was making it difficult, “I understand if you think I acted rashly, but I assure you, I brought her here knowing no one will miss her for at least a week.”

“Really?” Eros seemed to relax, which made Lilly relaxed. Until he began his dreaded listing: “So you knew about her studying about demonkind and the disappearances?

“Yes, I did, which is why I--”

Eros interrupted, “--Oh, good, so you prepared reports to send to the other princesses, so they won’t get suspicious?”

“I, uh, well-”

“-You did know about her meeting with her friend, Rarity, at the Manestar restaurant… yesterday?”

“No, I didn--”

“-Shocking. You did, at the very least, know about the dragon Spike that is *ALWAYS* by her side and has been waiting for her at the hotel?”

“Oh, Tartarus, no,” she felt very, very tiny right now. A bug ready to be crushed by her brother's cloven hooves. The power that twisted in his hands made his eyes glow a bright opaque green and his white hair stand as the power coursed through him. This was the end for Lilly. She will be sent to the darkest pits of Tartarus and end up as a plaything to the Abyss King, a ruler who likes skinning as a pastime. She did not like to be flayed alive. She braced for the blow--

--Of her brother’s breath; excising the fury he had built up in his chest. “You’re lucky the dragon is actually in Las Pegasus for a comic con.” Lilly released the air that had been dammed away inside her chest.

Eros rubbed his forehead temples, trying to relax the pounding inside his head; it did little to relieve the stress that his anger was hammering at him. “You are fortunate that *I* was assigned to investigate this or we would be in even deeper hell than we currently are! This whole harvest has been compromised, Sucula. For infernals sake-- J-just get the captives ready to be released and sort out the stockpile we have. By the lost Queen, the shortages are going to hurt us.”

“We’ve gone over our quota.”

“...What?”

Lilly eyes brighten in the dark atmosphere. Her tail pointed to the mountain of flesh that is Twilight, “It’s thanks to her that we reached the amount ahead of time. Oh, the richness of it, Eros! It’ll keep an impling full for days!”

Eros watched her sister drool at the description. He would’ve dismissed it as Sucula’s taste in lust, but the orb between her horns: it does not pulsate like that unless one had a binge or the prey is that potent. It did not matter anyhow. The kidnapping was reckless and now they would have to lay low or be discovered by the Equestrians; they did not have the resources to be hunted down by the guard. He shivered at the thought of what the elements would do to their kind. The Changeling Queen losing her hive was a dreaded outcome for any demon and their clans.

He sighed, “Revert the captives back to normal first before you sort out the stockpiles. I’ll handle the princess.” If Twilight is that… potent, he cannot trust his sister in the reversion process. It was not the first time she kept a captive she liked as a pet.

“C-can’t we just keep her for a few more days? Just write a letter to say she’s fine and she found the others at a private retreat like we planned?” Lilly asked.

Puppy-dog begging would not win her the day as Eros smacked it away with reality, “She’s far too active of a pony to not be missed, Sucula. If you actually planned this right then, perhaps, but it’s too late now. We’re just fortunate no one has come looking for her yet!”

She wanted to retort but Eros raised a clawed finger to stop her, “Do as I say, Sucula or the council will have your heart.” He said, not to threaten her, but to warn her of the consequences. Lilly, defeated, limped down the hallway to do her task. Eros' eyes locked on to the purple whale in the room.

She felt so warm and soft. So secure in her prison of blubbery flesh. Her limbs were useless tree-trunks, her breasts were beachball orbs that pushed her neck flab against her bloated cheeks, forming a comfortable pillow for her head. Her rear lost all definition, it was all just a waterbed of cellulite, even her back had layers of flab that cushioned her useless wings. And then there was her belly, the epicentre of her warmth and it was her favourite part of her. So squishy and gratifying. Her condition should have caused all sorts of health issues, yet she still could breath soft and soundly as if she was dreaming. Maybe this was all a weird dream.
A hand touched her favorite spot and she welcomed it with a moan. Lilly had return. Concern had welded up inside over the yelling of what Twilight could best describe as a feral diamond dog. She worried for her mistress, but she is here now and she did not have to worry about anything anymore.

“Twilight.” the deep voice called out. That was not Lilly. Twilight opened her eyes; an effort that felt as though she was trying to lift 2 boulders with her eyes, she overcame the sands of sleep to look at the new indigo newcomer. The only thought she had for the newcomer was that he had gentle green eyes.

Eros stared at the red eyes of the princess: he saw the lust in them and also curiousness, wonder and other emotions. He breathed a sigh of relief. The sight was good news for Eros. Even at her Current state of enthrallment, seeing those other emotions in her eyes instead of endless need of sex was some good fortune for him in this mess. The efforts to revert her back to her normal state would not be arduous at first thought. Strange, though, Eros pondered. In her current condition she should be like an animal in endless heat: wanting to do nothing but eat, drink, fornicate and sleep. Must be something to due with her Alicornhood, Eros guessed. Whatever the reason, Eros hoped he could revert her back to normal today, but at this size -- he rubbed the belly again -- it won’t be simple. With a heavy groan, Eros got onto the bed, he gently moved the mare onto her back and between Twilight’s spread legs face the mountainous gut. He wrapped his arms around said gut and rested his head on top of it. Normally He preferred to knee down, however the sheer size of Twilight’s gut prevented that. He placed an ear to it feeling the steady rise and fall of her breathing and listening to the inner workings of her stomach. Then He and her caught on fire.

Twilight yelped in surprise at the sudden feeling, yet cooed softly at the sensation of being in the spa ponies hot tub: the warm water and bubbles massaging her skin, removing every knot and stress out of her body. She and Rarity should make an appointment sometime soon. Her cooing became a pleasant moaning as Eros began massaging the sides of her belly. Whoever this stranger was, his gentle touch always knew the right spot to rub and find a nerve to excite. The sensation was so great that she did not even register her quivering belly was slowly shrinking away like a fire to candle wax. Eros’ flames burned the flab away in her gut. When it reached half the size it was, the rest of the flesh began to shrink away. Days of explosive weight gain was being burned away by his gentle caressing flames in but a few moments. Yet the toll was becoming apparent.

Sweat dripped off of his soaked fur as he continued to burn away the demonic flab within the princess’s body. He expected the demonic sorcery to be potent inside Twilight, but somehow her magic has enhanced the demon sorcery. No wonder her sister was able to absorb so much. The Princess was like an enhancement to their magic. If that was not bad enough there was Twilight’s lust: a sweet succulent fruit that just kept pouring and pouring out her desire which never lessened no matter how hard one squeezed. It would take days to burn all this off and he’s trying to do it all in an hour! Even demons of his calibre would be overwhelmed and become a sex-crazed monster. Was his will strong enough to succeed or will he fail? He hesitated. It lasted for only a second. He had to or his kind would be endangered. With renewed ambition in his eyes, Eros’ flames blazed higher and he pressed down his hands deeper on Twilight's still large belly. His face turned to a devilish grin of a mad villain beating the hero who stood against them for so long. Yes, this is what this was, he thought: a challenge to overcome, to keep their secret safe and have an awesome feast of this maelstrom of emotion, power, and lust. He was halfway done when he felt his body spasm from all the lust he had drained from Twilight’s body. Muscles bulged out of his skin as his rational mind fought against the primal side that wanted to plunge into the Alicorn’s still plump form. Plump, Eros repeated the word again. He looked at Twilight’s breast. His flames had burned away most of fat, but her bosom was still their oversized bountiful form. Bigger than his head he would be lost in them if he sank into them. He licked his lips, tasting the salt of his dripping sweet. If there was one part he loved more than anything on a mare, it was having an ample cleavage.

“Just one grope,” his primal side whispered in his mind, “A light squeeze is all you need before they go away.” his hand reached for the right one; shaking as it grew closer and closer and squeezed the flesh, feeling the softness and firmness of it. Twilight let out a welcoming moan which enticed him to grab the other. They felt so good, so plump and filled with milk, he could only imagine the taste of this lust-filled Alicorn would provide. His primal side pushed him into it, but he retracted by mentally headbutting his bestial thought form, breaking its non-existent nose. He let go; the flames dispersing as soon as he did. He panted, hard. He was so exhausted, mentally and physically, too. He never imagined the hero of Equestria to be this lust driven. Did Lilly awaken some deep desire within the Princess? By the queen, just reversing this was as if he was in an orgy and denied his climax multiple times. He stared at Twilight’s half-lidded eyes: the red glow had lost much of their hue, but like her body, there was still a layer of demon energy and flab to burn away. It was a shame, too. She was that right size of plump that a stallion would love to explore if they were into thicker mares. He shook his head. Eros needed to recover if he wanted to get Twilight done today. He did not want to give his sister the satisfaction to gloat if he had his way with the princess. He was about to leap off when Twilight trapped him between her arms and legs. The sudden weight caught him off-guard and he fell forward. Twilight used the sudden descent to embrace him in a deep passionate kiss.

Mmmh, so very sweet and warm was her impression of his lips. Twilight did not expect the stranger to taste like her favourite rock candy. She giggled at his surprised shock in those green eyes, he was not expecting that, and why not? Giving her the best body massage she ever had and not expect a reward? She knows what he wants, those eyes are just like Lilly’s. They told her what he wanted. Earlier on she just wanted to be embraced, but this stranger brought out a deeper hunger she was all too happy to indulge with this handsome pony.

The last thing Eros needed was being kissed! And this was not a typical virginal princess kiss. It was hard, rough snogging with tongues battling for dominance. Her purple body started grinding his and her still beefy thighs found a way to knead his most sensitive ‘spot’. It was too much for his vulnerable psyche; so filled with desire and the overwhelming need to take this magnificent mare as his. He felt his stallionhood unsheathed itself, those cursed thighs grinding harder at his meat, encouraging it to come out. A feral groan escaped his throat, his vision fading. The last thought in his mind before his true incubus side took over, “Dam you, Sucula.”
With his stallionhood fully erect pushed into the mare below. The demon let out an animal growl of approval as the muscles of the mare’s flower rub his organ tightly in her.

S-so big, so warm, was all Twilight thought about when the stranger slid in his stallionhood into her marehood. The size of its girth pushed her inner walls to their breaking point, yet she felt no pain or even stress in her muscles, just her nerves ablaze with euphoria as he went in deeper and deeper in. She could barely stop her endless moaning. She gasped as the tip docked into her tender spot; the tip poking out of her uterus. She let out a high pitched cry as he retreated out of her only to slam back in with nerve-flaying pleasure. Her screams were muffled by Eros’ lips in a hard embrace between her own.

Like a piston Eros entered and retreated his meat with such speed and fury that it should have brought more pain than pleasure to the Alicorn. It could if Eros wanted to, but He was not into that ‘kink’ like some desire demons are. Eros was simple, tamer than other demons. He enjoyed just feeling his prey spasm as he pounded into them. Feeling the heat of their bodies, the fur damp from their sweet, the taste of their tongue. But of course there was his most favourite part of a mare he so adored playing with. He broke their kissing, Twilight trying to bring oxygen into her exhausted lungs. She purred feebly as Eros went for his favourite part: the bosom. Those bountiful orbs deformed as he pressed his hands into them. Feeling again their firmness and the milk that sloshed within them. He rubbed the tips of her teats, the mare’s excited cries persuading him to press harder to milk out the ambrosia that he loved. White liquid spluttered out and before any could escape, Eros enveloped her areola with his maw, sucking powerfully, drinking both her milk and lust essence. All the while he still drove into her without even missing a beat. Even when lines of flame began to tattoo out around his body.

He was getting closer now. His body reacted to the waves of lust and passion that Twilight put out. By instinct he absorbed it all and his body began to heat up. The tattoos around his body began to flare up with green flame. With some sorrow he departed his mouth around that glorious mound of flesh and straightened himself, putting all his focused into the climax. His pounding accelerated to a borderline blur.

Twilight bit the tip of her lip, trying to feel some other sensation than the white searing ecstasy of her poor marehood. She dared not watch anymore fearing her mind would break if she went in too deep in that ocean of pleasure. A grain of thought asks how she had not climaxed yet.

Eros neared the crescendo of orgasm, his Tattoos a furnace of fire from the impossible output of the alicorns lust. It was the perfect time to finish it. And at the final moment - he stopped. He felt her behind him, gloating.

Too good to resist, huh?

Dam you, Sucula...

Twilight eyes fluttered open, a mix of confusion and disappointment awash her face. She started at the blank eyes of the stallion. The green flames a steady burn. She opened her mouth to ask what was wrong. In that split string of a second Eros kissed her and slammed into her one final time.

Twilight’s world went white then green as the nova of her orgasm and Eros’ ejaculated into her. Both were consumed by Ero’s fire that was their passion.

You really know how to pick them.

I always do, brother.

Author's Note

Sorry for the wait. I just have the epilogue to finish up and this story is over. It was an interesting tale to make. Hope the 'reversal' does not disappoint some of you.