Bluebelle

It was a fine Summer's day and Celestia was feeling good. There wasn't a single cloud in the visible sky.

Suddenly, she heard a familiar snobbish voice. 'Spoke too soon. There seems to be one cloud, at least'

There it was, her nephew Blueblood, giving the castle staff an undeserved tongue-lashing, as usual. He really was a jerk, most of the time.

"Watch where you're going, wench!" the stuck up Pony said.

The maid considered a witty rejoinder, but thought better of it, instead going with, "I'm sorry! It won't happen again, sir!"

At breakfast with Luna, Celestia discussed the finer points of what they should do about their nephew's bad attitude.

Eventually, Luna had a brilliant idea.

She whispered to her sister, and a grin slowly formed on Celestia's face. They knew just the thing.

Waking up in the morning as per usual, Prince Blueblood noticed a letter on his nightstand. Picking it up, he read it.

Dear Nephew.

We've decided that it's high time to give you some new responsibilities. Come to see us at your earliest convenience.

-Your aunts

"Finally!" Blueblood said with a smug smirk. "They see my natural talent was squandered as it was."

He hurrried in getting one of his best outfits and dashed to the throne room.

"I'm here, auntieeees~!" he said in a sing-song manner.

Luna opened pleasantly. "Why, nephew! How good of thee to come!" she said, as if it was a surprise that he'd graced them with his presence.

"I'm answering your summons, aunties! I understand that this is important?"

"Why, yes! VERY important!" Celestia replied. "We think that it's a good time to give you a bit more responsibility, since you've handled the tasks that you've undertaken so well." she added, with a subtle bit of sarcasm.

"I'm glad that you considered the task worthy of me. What is it?"

"We think it's time that you were recognized as official royalty. Nothing huge as of yet, just a small event. After that we'll tell you of the task ahead."

Blueblood smiled, clearly looking forward to what would come.

"However, there's a caveat that thou should'st knoweth of." Luna said.

"Yes." Celestia put in, "For as long as we've ruled, there have been some Alicorn sightings - aside from us. You may have seen one or two yourself?"

"Can't say I have." Blueblood said, somewhat puzzled. He had no idea what was about to come.

"Yes. One in Manehattan. Two in Mustangeles. One in Trottingham. One or two in Vanhoover, even! Do you know what they all had in common?"

"No. What might that be?" the hapless prince queried.

"All of them have been female. As almost all Alicorns (about 75% of the Pony population in general, for that matter) happen to be."

"Where are you going with this, auntie?" Blueblood asked, tilting his head slightly.

"Thou shalt see'th where in a moment." Luna said.

Unceremoniously, the two sisters blasted the prince with a jolt of magic.

Immediately, Blueblood began to shrink somewhat. The muscle that he'd managed to put on started to diminish as well. His snout rounded off and his mane and tail started to stretch out. His coat became more glossy and smooth as bumps started to form on his back. His throat itched as his voice-box started to change. As if on cue he said, "What did you do to meeeee?!"

"Don't think we haven't noticed how you treat the staff around here. What we've done is give you an opportunity to have a taste of what a mare's life is like." Celestia said with a smug smirk. "Now just relax; it'll make the change easier on you."

Just then, some of the maids came through the entrance. They'd been called for by the Princesses and arrived just in time to catch some of Blueblood's transformation.

Bluebloood was still feeling it hard. He started trying to run, but that only made the change more painful! As his groin started to itch, so did his underbelly and his backside. "No, no, no, no!" he exclaimed, swiftly becoming a she instead. As his penis finished withdrawing, it was replaced by a set of teats and feminine folds. As female hormones flooded her system, the bumps on her back were growing larger by the seond, swiftly becoming full fledged angelic wings. Feathers began to grow on the new appendages and her horn lengthened, developing even more rings than the previous shape.

Her clothes also started to shift, becoming less dress suit and more dress like. The tie she'd added while she'd been male started to migrate to the back of her head, becoming a large cornflower blue bow.

Luna said, "Thou did'st bringeth this upon thyself, niece. Maybe it shall teacheth thee to appreciate the fairer sex, since thou shalt be among them for the forseeable future. Furthermore, thy first heat shalt kicketh in soon. Good luck avoiding the attentions of stallions that passeth by." she added.

Sure enough. Bluelood felt heat spread through her system. She started to feel the urge to find a handsome stallion and-

'Nope! Nope!' She tried her best to block out those thoughts, attempting to run back to her room. As she ran, she attracted the attention of several passing males, which only spurred her transformation further, causing her to develop enlarged hips; foal-bearing hips.

In her mind she could still hear the voice of her azure aunt. 'Did'st thou thinketh that running off would'st alloweth thee to escape thy fate? If so, thou were't mistaken.'

Her mane curled into a new style, becoming twin naturally coiffed 'tails'. Also, her cutie mark began to change, becoming one depicting iconic blue dangling flowers with a golden stem and every second one sporting gold and blue petals on the outside.

As she entered her room and slammed the door shut, she felt her teats begin to fill with fluid, a distinctly odd feeling. Then they started to slowly drip, the pure white milk dribbling on the floor. She scrambled to find some bottles to store the excess fluid, to avoid making more of a mess.

'Don't worry. Thou shalt only needeth to do that once a day. For now, at least. Some extra bottles shall be sent to thy room. We hath at least that amount of couth.'

Finally finding some vacant bottles, she sat down to allow her to empty herself of the lactose laden liquid.

Thus began the newly minted mare's new life. Gone was Prince Blueblood. In his place was princess Bluebelle.