Sunset woke up to find herself in a very familiar position with her mother Celestia. She is laying on top of her mother's larger body with her head nestle between her giant breasts using them as pillows. Celestia would wrap her arms around Sunset and place her on top of her letting herself be used as a bed. With her smaller body and lighter frame, Sunset was easily supported by her mother's bigger body. Sunset body is still underweight of what it should be and still recovering from starvation while she was trap in the vault. Sunset been place in a high protein and liquid diet which the later is her mother's milk. Which she has plenty to give to her daughter, which Sunset has gotten use to feeding like a baby, she would often just sit on her mother's lap and drink from one of her breasts. And it's her mother's milk that is helping her body to recover quicker then it would have otherwise.

Sunset struggle to free herself from her mothers arms holding her tightly to her warm and soft body, but her mother is just stronger. Seeing she needs to wake up her mother, again Sunset took a nipple into her mouth and began nursing. Celestia let out a moan feeling the familiar sensation of her breasts being nurse on. Upon waking Celestia smiled looking between her breasts to her daughter nursing on her drinking her fill of her rich milk. She is very protective of her not wanting her to disappear from her sight. She's been having nightmares of what Sunset was when she first saw her. Nothing but skin and bones begging to be let out of the vault... calling out for her to save her. She wouldn't let Sunset be harm like that again.

"Morning Sunset," Celestia said as she used her magic to turn the world around to face the sun. (1)

"Morning mom," Sunset said as she licks her lips after she stop nursing.

"Time to get up," Celestia said letting go of Sunset who stumbled to her feet off the massive bed. Celestia followed her into the bathroom and help her daughter in undressing for their morning shower together.

Celestia lifting the night dress off of Sunset, stared at her naked body. She still has a long way to go before she's back to full health as she still needs to put meat on her bones. While she had brought Twilight in to help Sunset adjust to the world after being away in another for so long, she had told Twilight not to engaged in any sex with Sunset till she tells her it's ok. Her body is still weak and sex would just hurt her as she is now. The show they gave to Sunset was just an example of what she's in for when she's well, that she explain to Sunset and Twilight.

"Mom is Twilight going to be here again?" Sunset ask.

"No she's busy with her studies so it just be me and you today," Celestia said as she spend as much time with Sunset as she could.

"Mom is she really ok with being my lover?" Sunset ask.

"Twilight does have 4 other ponies who she spends time with and had sex with. She isn't that experience in sex, and is much smaller then others in her age group," Celestia said.

"She's small?" Sunset ask shock.

"Yes at her age she should be bigger but for someone of your size she's a good start," Celestia said.

"What's the normal size for a penis?" Sunset ask blushing.

"Once fully matured the normal length is on average between 12 to 20 inches depending on which tribe the pony belongs to. With Earth Ponies being the largest and the pegasus being the smallest because of their body size. Of course there are some exceptions and there are spells that increase and decrease the size of a pony," Celestia explains.

"Really?" Sunset ask glancing down at her mother's monster size penis, it was in it's sheath like that of a horse but it was still huge. "Mom are you using a spell on yourself?"

"Well... I don't want to ruin someone as young as Twilight," Celestia said blushing a bit.

"You're even bigger?" Sunset ask shock.

"I only use my real size when my lover is big enough to take it. Usually Earth Ponies as they're more in my size range and can take my full size. But of course there are some who enjoy taking it long and hard," Celestia said blushing as she remembers her past smaller lovers who could take her full size.

"Mom, I won't grow much bigger then, I am now. It's ok for the Ponies to take someone of your size but it's simply too big for me as, I'm human and penis size for males aren't normally over a foot. Twilight would be above average in the human world," Sunset said as she'll be lucky to grow to 6 feet. (2)

"Don't worry my little Sunset, I'm having the mages looking for a way to turn you back to normal. Whatever you did to change yourself into a human as you were in that other world. Well be undone," Celestia said as she hugs her daughter.

"Back to normal...," Sunset mumbles remembering how badly her mother broke down the last time she brought up she might not be her Sunset.

!

Elsewhere -

Twilight was meeting with her friends having lunch in her home. They heard about her meeting with the strange creature that Celestia is keeping in her room and that she had sex with the princess. There have been alot of talk of what's been happening in the castle ever since the strange creature was found and the girls wanted to know what the truth is from the rumors. Which Twilight now found herself surrounded by her friends who all want to know what's been happening in the castle.

"Well?" her friends ask causing Twilight to scan around the table where they're sitting and having tea. Spike had made some tea for them and brought them some cookies. Then he left to go to Doughnut Joy to get some food, as he's still a growing baby dragon who keeps on eating whenever he has a chance to.

The nearest to her is Moondancer a female unicorn. She has a light yellowish gray coat, red mane and tail with purple highlights, purple eyes, and a cutie mark of a crescent moon and three stars.

Minuette a female unicorn pony with a Maya blue coat, periwinkle mane and tail with a pigment blue streak and steel blue eyes. She has an hourglass cutie mark.

Lemon Hearts a female unicorn pony with a yellow coat, a cerulean mane and tail with a lighter tail streak, raspberry eyes, and a cutie mark of three hearts; two light blue and one light green.

Twinkleshine is a female unicorn pony with an ivory coat, curly pink mane and tail, electric blue eyes, and a cutie mark of three sparkly blue stars.

Lyra Heartstrings, occasionally called simply either Lyra or Heartstrings by her friends, is a female unicorn pony. She has a magic mint coat, brilliant cyan mane and tail with a white streak, sunglow eyes, and a cutie mark of a lyre.

And the new comer is Bon Bon, a female Earth pony with a beige coat, pigment blue mane with a rose pink streak, cerulean eyes, and a cutie mark of three candies and wrap as three bows. She is Lyra's girlfriend and they been dating each other for awhile now and could be seen that they're going to become mates.

And something Twilight tries not to notice is the fact that she's the smallest of her group of friends. Since all of them undress after going indoors and out of the public eye, it's not hard to see. She had never had sex before till she had sex with the princess, she was just too busy studying like Moondancer. Who without her ratty black sweater she always wore outside, showed the largest breasts of the group. Glancing at Bon Bon, who is an Earth pony and larger in body sizes, both of them seem to be the same size. But of course they're not bigger then the Celestia's who is just huge. She couldn't help but wonder how big her friends cocks are, which are hidden by the table.

"Twilight?" Moondancer ask getting her attention.

"Sorry," Twilight said. "Well the creature that was found in the castle is the princess's former student Sunset Shimmer."

"What?" all of them but Bon Bon ask.

"She's the creature?" Twinkleshine ask.

"And she's back?" Minuette ask.

"You girls know her?" Twilight ask.

"Know her? She was just just rude and thought she was better then anyone else," Lemon Hearts said.

"What did happen to her? I heard you talk about her before Lyra," Bon Bon said.

"Don't know," Lyra said as she as the others turn to Twilight for answers.

"She went through a magic mirror to another world that is populated with beings called humans. She was transformed into a human while there and the humans of that world come in two sexes like some of the other races here," Twilight explained.

"These humans have two sexes?" Minuette ask.

"Humans? Like those old stories from Dream Valley?" Lyra ask being a huge fan of those old stories. And she's been researching on the humans that helped the old ponies of that time.

"Yes from what Sunset remembers," Twilight said.

"So let me guess she came back and the princess took her back," Lemon Hearts said.

"No. When she return she found herself trap in one of the vaults in the basement of the castle and the mirror shut behind her trapping her. She spent at least a month or more trap there. She was force to eat and drink the potion supplies that were kept in the vault to stay alive. It did something to her, it change her body back into that of a human female and warp her mind. What she remembers is that this world we ponies walk on four legs with hooves like pigs. And that we came in two sexes like some of the other races," Twilight explains to her shock friends hearing what happen to Sunset.

"How did she escape?" Moondancer ask.

"She made a bomb of what's left of the potion supplies and used the magic light in the vault to set it off. At that point she was nothing but skin and bones, so she had nothing else to lose if the bomb killed her. The blast sent her into a coma and alerted the guards. And that's how the princess found her. Sunset had kept a dairy while she was trap and the princess learn why Sunset acted as she did. All she had wanted was for the princess to be her mother. The princess is now always with her when she isn't busy as she is still recovering. She is still skinny from what, I saw while we were in the shower. The princess is going to reveal Sunset when she's in good health so please don't say anything to anyone else," Twilight explains.

"Ok," Lyra said.

"Anything else we should know?" Bon Bon ask.

"Well she has a strong scent coming from her that makes... makes...," Twilight mumbles to herself.

"Makes what?" Minuette ask as she and the others stare at their friend.

"Her scent makes ponies who smell her go into heat," Twilight said blushing.

"What?" all of her friends ask.

"It's true when, I smelled her, I wanted to rip her clothes off and fuck her. But with the princess there and seeing how skinny she still is stop me. That's the reason why the princess has kept her in her room to make sure no pony would lose control of herself and take her," Twilight explains.

"How has the princess handle the smell?" Twinkleshine ask.

"She place a spell on her that keeps the smell low and she's... been having more sex to keep her from being overwhelm by the urge to have sex," Twilight said blushing.

"Wait more sex?" Moondancer ask glaring at her. "Have you and the princess had sex?"

"Yes," Twilight answered weakly.

"Twilight you do know Moondancer wanted you to be her first right?" Lemon Hearts said.

"She's wanted you and her have sex on her up coming party," Minuette said.

"Sorry it just happen and the princess... she's... well just look at her could you tell me you wouldn't give in to have sex with her?" Twilight ask Moondancer.

"Point taken...," Moondancer said. "But still... you had sex with her before me. There is no comparing me to her sex drive. I mean how many orgasms did you have with her?"

"I... lost count.... after the 10th," Twilight said blushing from all of her friends staring at her.

"So the rumors are true," Lyra said. "How big is she?"

"18 inches and 3 inches thick," Twilight said blushing remembering how it filled her.

"She is using a size spell to make herself smaller," Bon Bon said.

"What?" Twilight ask shock.

"She's much bigger then that. She keeps her cock that size to be able to have sex with ponies who are smaller in body size then Earth Ponies. I heard about it from my cousin a Earth Pony who works as a guard and taken the princess at her full size," Bon Bon said.

"Really?" Twilight ask.

"She is larger in body mass then other Ponies and only uses her real size on Earth Ponies or those who are size queens. So she keeps it at Earth Pony size," Bon Bon said.

"Earth Pony size?" Twilight ask.

Bon Bon stood up revealing her penis to Twilight and the others to see. Twilight's eyes widen as she saw it as watch as it reaches it's full mast. It does look to be around the princess's size and looking down she saw how big her balls are.

"Twilight don't you know the average size for the different tribes?" Minuette ask.

"I... too... study," Twilight mutters.

"The average length once fully matured for a Pegasus is between 12 to 14 inches, a Unicorn is between 14 to 16 inches and Earth like Bon Bon is between 16 to 20 inches. But of course that's depending on how body size of the pony is and other things," Lemon Hearts said.

"Really?" Twilight ask as she looks down between her legs at her penis which is hidden behind her loin cloth.

"There are some Pegasus with penis that are more suitable on an Earth Pony," Twinkleshine said.

"Not to mention Moondancer," Lya said.

"What?" Twilight ask.

"Well...," Moondancer said as she got up revealing her penis which gotten hard thinking of what the princess did to Twilight and how it would had felt.

"Wow," the girls said staring at the massive penis she has that is as big as Bon Bon's.

"You're my size," Bon Bon said staring at the tower of flesh. "18 inches too?"

"I'm 19," Moondancer said.

"That's bigger then the princess," Twilight said.

"Twilight she does use a spell to make it smaller. I heard she keeps it at 18 so she can have sex with a bigger range of lovers," Bon Bon said.

"I'm 16," Lemon Heart said.

"15," Twinkleshine said joining in.

"14," Minuette said.

"I'm 16," Lyra said.

"I'm... 8," Twilight said meekly as all of her friends stared at her.

"You're only 8?" Bon Bon ask.

"I am the shortest," Twilight said.

"True but you should have gotten a growth spurt," Minuette said.

"It's the reason why, I never... till... I... with the... princess," Twilight said before perking up. "But of course, I'm the perfect size to be Sunset's lover... till the princess figures out a way to turn her back to normal."

"You only had sex with the princess right?" Bon Bon ask.

"Yes," Twilight answers.

"Moondancer can be your second and then we'll all have an orgy bringing you two into the herd. That way you can make it up to Moondancer for not being her first and that you'll learn how to please Sunset," Bon Bon said.

"I have been researching in all the books, I could find on how to have sex and pleasing your lover," Moondancer said.

"We're in!" the other girls agreed.

"WHAT!" Twilight shouted out as her friends closed on in around her.

!

Twilight found herself on her bed with her friends gathered all around her, all of them stroking their penises to full hardness. She looks around at all of her friends grinning down at her as they waited for their turn with her. And between her legs is Moondancer, her eyes going back and forth from the smirking, domineering face of Moondancer to the huge, belly-filling monster that's connected to her hips.

“Moondancer go slowly. That's how the princess did it,” Twilight said.

Moondancer approached, fatuously stroking the flesh beast that preceded her flat abdomen by an imposing foot and more. As if she hadn’t heard Twilight's verbal plea, she ordered to Lyra and Lemon Heart “Pull her feet over her head.”

With a whimper, Twilight was grabbed behind her knees and pulled until the soles of her feet once again were thrust into the air far above her head. Her broad ass was tilted nearly straight up, her cunt and deep cleft of her butt wide open to the advancing pony. Both Lyra and Lemon Hearts help themselves to her breasts, taking her nipples into their months and suckling. Minuette and Twinkleshine joined on in the fun, they alternate between licking either Twilight's penis or her cunt. Bon Bon just stood by watching.

Moondancer observed the effectiveness of her friends handiwork, Twilight was soaking and glistening from her mound to the end of her ass crack. Streams of juice and spit from her friends using their mouths on her body drooled around her fully extended penis and cunt and down her belly to her navel while more sex sap ran straight back down her ass crack and over her tail from the bubbling fuck slit between her thighs.

Moondancer knelt behind the woman’s upturned back, rubbing the monster phallus in the sodden gash, soaking the beast with feminine fuck essence until it dripped and shone. Her friends backs away from their feast so she could have Twilight to herself. Twilight’ labia wrapped themselves wetly around the obscenely big head of the penis, as if trying to draw it into her guts. Rubbing the flared head up and down Twilight’ fuck slit from her distended clit to her gaping fuck hole, easily pushing aside all labial resistance.

"You did say go slow," Moondancer teased as she slowing force herself into Twilight's cunt but took her sweet time doing so.

Twilight groaned in mortal frustration, her hips twisting and humping upward in a futile attempt at achieving penetration. For long moments Twilight strained and lunged, trying desperately to impale herself, without success. Moondancer arched over her, on her hands and toes as if ready to do push-ups, and waited, teasing the maddened pony with sudden, short jabs and rotations of her cock. Their other friends watched the foreplay teasing getting more turned on as they watch.

Moondancer upped the sexual agitation ante by initiating a slow pushing of her fat cock head, partially into the gaping hole that was the opening to Twilight's belly and then rapidly withdrawing. Twilight's cunt made loud popping and sucking sounds as Moondancer pulled out and their friends gasped, moaned and whimpered when Moondancer pushed inward. It was too much.

“Oh, God damn you–you win! Fuck me, please! Anything, just fuck me now! Please! Fuck meeeeeee! OOOOOOOOOOOOOOOOOOH!” Twilight shouted.

With a cocky grin Moondancer smoothly and effortlessly sank her dong into her friend's begging slimy gash. Twilight wailed blissfully and continuously through the entire penetration, her eyes bugging out, her hard nipple boobs thrust ecstatically upward towards her conqueror. No sooner had the cunt rending penis struck solidly the bottom of her belly, than Moondancer flung her own well muscled and formed buns into the air, ripping her dick from the widely stretched fuck hole of Twilight. Recklessly and irresistibly she again plunged back into her friend. Twilight's eyes rolled into her skull, her toes curling alongside Moondancer’s ears, as both Lyra and Lemon Hearts continue to hold her legs up.

“Oh, Celestia, what are you doing to me? It’s soooo goooood! Don’t stop, never stop! Keep fucking me, darling!” Twilight shouted.

“Like it, Twilight? Really fills your belly? Want more? I'll show you what, I learn from all the books I have read!” Moondancer moaned over the wet slaps of their hips made against each other.

For a solid ten minutes Moondancer worked up a sweat 'working out' on the equally sweaty body of Twilight's. Loud, satisfying grunts were forced from Twilight with each belly filling plunge while equally loud and sloppy suck sounds were emitted on the withdrawal. The fellow book worm hips would smack loudly against the other book worm's proffered ass and thighs in a raw, animalistic rhythm that could not be ignored by the pierced Twilight's cries. In turn, Twilight’s penis was crushed on each downstroke. The result was fire between both women’s legs and, for the wailing Twilight, orgasm both mind-numbing and enslaving.

Moondancer had read long ago the accounts of the consummate thrill of seducing ponies and pushing their limits, emotionally and physically, with massive penises. That many older ponies had written about their first hand accounts, and the ones about the princess who is a master at the art of sex thanks to her long life. It was the height of many experienced lovers sexual egotism to plow females, especially someone who is still learning into a dick induced mind–fuck. Moondancer now has Twilight in that condition. Each deep jab, each forced gurgle from the convulsing pony’s throat, each time her eyes rolled up out of sight told Moondancer that here was another member of her groups herd. Twilight was becoming addicted to the bliss only found under an experienced lover who alone could provide the special phallic size and all important technique that would both fill her belly and satisfy her mind. Of course she only learn from books, and the princess must have held back as it was her first time, but it still counts.

At almost exactly ten minutes after the first thrust, Moondancer collapsed most satisfyingly upon the quivering and receptive flesh of her lover. Twilight sighed contentedly, still beautifully stuffed, and wrapped her legs about her friend’s waist. She could feel her friend emptying her balls into her, filling her up like the princess did when she took her. For long moments Twilight would occasionally shudder and squeal in delight as the well buried phallus instilled orgasmic aftershocks from somewhere behind her navel. Then, Moondancer began pounding again. And proved that Twilight could scream even louder the second time.

Then finally Moondancer was spent and rolled off of Twilight pulling her cock out of her well used cunt. Twilight was spent as well, she could only lay on her back feeling the cum in her belly coming out of her. Then she remembers there are other ponies in the room with her, when Bon Bon crawled onto the bed and between her legs.

"Now it's my turn," Bon Bon smirks as she easily pushes her own monster up Twilight's lubricated hole and began pumping her with the same vicious pace and severity as Moondancer.

Over the course of the day each of her friends took her. Twilight had innumerable orgasms and she was filled with so much spunk that it pooled on the bed till she was practically swimming in it when Lyra finally came inside of her. Then all of her friends crawled into the bed with her and started having sex with each other and head in one big orgy with her and Moondancer in the middle of it. Her friends were already all apart of a herd already and once new members enter the herd, all the herd members would gather and have an orgy with their new members making them one with the herd.

Spike return to find Twilight in bed in the middle of a pile of her friends, all fucked out and sleeping it off.

"Twilight is finally apart of the herd. Good for her. Now, I don't have to remind her of Moondancer's birthday," Spike said as he turns around and heads for the kitchen to make something to eat.

Author's Note

1 - In the fic Celestia and Luna don't move the sun or the moon. They just use their magic to turn the world around. The world they live on doesn't spin on it's own. The Princesses and unicorns before them use their magic to keep the world spinning.

2 - The average size for human males are between 4 to 6 inches.