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Blueblood had only been walking the halls of the castle for three minutes, and he was already getting tired. He missed the strength and stamina of his old body even more now that he actually had something heavy to carry around. The box of anal plugs Celestia had left him was surprisingly heavy, and his pitiful magic couldn't lift it. He had to lug it around on his back, though several servants had already offered to help him. He had turned them away with a few harsh words, terrified that one of them would peek inside or see through the illusion cast on him.

Celestia's spell was holding up rather well, at least. Nopony had noticed his change in size, and they all still treated him like royalty. "A silver lining," Blueblood thought wryly as he reached up to knock on Celestia's door. "Huzzah."

The door opened and allowed him in, then shut and locked itself behind him. "Ominous," he said dryly. "Can we please get this over with?"

Celestia was lounging on her bed with a book held in her magic. "You have a lot to learn about your new position," she said with a welcoming smile. "To begin with, you don't dictate the schedule. Climb up here, dear. Just set those anywhere."

Blueblood set the box aside and climbed up onto the bed with Celestia. "Goodness, look at you!" she snickered. "I didn't realize how tiny I made you until just now."

"Don't rub it in!" Blueblood snapped. He saw Celestia's unhappy glare, and immediately shrunk away from her. "I-I'm sorry," he whispered.

Celestia's magic pulled him across the bed, and she kissed him affectionately on the forehead. "I forgive you," she said, "but mind your tongue in the future. Now, see if you can get me in the mood." She gently positioned him between her legs, and guided his lips to her own.

"Just like that?" Blueblood wondered as the pressure on the back of his head slowly increased. "No foreplay, or even an explanation of what we'll be doing?" This was evidently the way of things now, Celestia had already gone back to reading. He reluctantly made contact with the royal pussy and got to work.

At first Blueblood wasn't entirely sure what Celestia wanted, but she was more than willing to give him instructions. "Slower," she said as she turned a page. "No need to rush." Blueblood complied, and soon the only sound in the room was the faint _schlick...schlick...schlick..._of Blueblood servicing his new mistress.

The door to Celestia's balcony opened, and Blueblood was horrified to see Princess Luna striding in out of the afternoon sun. He gasped and pulled away, but Celestia's magic immediately forced him back between her legs. "What did I tell you the last time you tried to pull away?" The sun goddess asked. "Don't do that unless I give you permission." He could do nothing but clench his eyes shut and hope that somehow, despite no recorded instance of it every happening, the shame would be so great that it could actually kill him.

"Sister, have you seen our guards?" Luna asked. "We...err, I believe that they are hiding." Her eyes settled on Blueblood, and the former prince whimpered. He was still hoping for shame to strike him down, but it was seeming less likely by the second. "Oh, you have begun!" the night princess exclaimed. "His new form is indeed pleasing, sister. He has become quite adorable, and your punishment shall surely make an impression. Have you begun to prepare his anus?"

"Not yet," Celestia said calmly, not sounding at all embarrassed that Blueblood was eating her out right in front of her sister. She repositioned herself on the bed to get comfortable, and in so doing wrapped her legs around his head. She squeezed a little, reminding him that he still wasn't allowed to stop. "We were just about to begin. I believe that I saw Rock Solid and Spear Point in the Royal Library. They were looking at legal texts."

Luna beamed at the good news. "Wonderful!" she exclaimed. "Surely they are looking for a way out of their punishment. When they see that We are operating within the law, they will give up and submit to our wishes. We shall fetch them at once. Good evening, sister."

"Evening," Celestia called as Luna flew away. The sun goddess magically closed the balcony door and drew the curtains shut, then smiled at Blueblood's mortified expression. "What's the matter?" she asked. "You didn't think that Luna would be fooled by a simple illusion, did you? Besides, I can't very well keep your punishment a secret from the pony responsible for dealing with your accomplices."

With his tongue otherwise occupied, Blueblood was forced to remain quiet. He returned his attention to Celestia's marehood and tried not to think about what a goddess with control over dreams would come up with as a punishment.

This went on for a long time without Celestia showing the slightest interest in what he was doing. Her clitoris peeked out, and he even licked it once or twice, but still she remained aloof. Blueblood's tongue began to ache, and his jaw hurt like mad. Eventually he had to stop, and worked his jaw painfully to try and loosen it up. "Tired already?" She asked absently. She set her book down on the nightstand and levitated the box of plugs onto the bed. "We'll begin, then. I expect you to last longer next time."

Celestia popped open the box's lid and peered inside. "Which one shall we start with?" she asked. One of the plugs floated out, and Celestia held it up to examine it. "What do you think?" she asked. "Too big?"

If he hadn't been blushing before, he certainly was now. "Yes," Blueblood squeaked. Celestia floated it back into the box, and pulled out another. This one was much smaller but it still intimidated him. As much as he wanted to deny it, he knew that it would probably fit.

"You're so cute when you're embarrassed," Celestia laughed. "Alright, I believe I've found the right one. Lie up here next to me and lift your tail." She waited as Blueblood trudged over the mattress and sulkily threw himself down next to her.

"Do we really have to do this?" the former prince whined.

A drawer in the bedside table opened, and a bottle of lubricant floated out. "We don't necessarily have to," Celestia said. "However, let's not forget that you raped a pony last night. Then you tricked him into believing that he would be small and frail forever. I think it's only fair that your punishment should leave you feeling just as helpless, don't you? You are free to back out if you like, but that will put an end to our agreement. Is that what you want?"

Blueblood hid his face beneath his front hooves and shook his head. Celestia nodded. "I understand. The offer still stands, but if you are ready to prove how much you want to change, this is the time to do it."

A glob of clear goo was smeared onto the plug's surface, and Celestia held it up for Blueblood's inspection. "I'm honestly surprised that you need to start with something so small," she said. "I've seen you flirting with quite a few stallions. I thought you'd be more experienced with anal play. Frankly, this part wasn't meant to be all that unpleasant for you."

"I-I don't like to be the one receiving," Blueblood whimpered. "Hurry and get it over with."

"And I thought that you were a quick learner," Celestia cooed into his ear. He felt the cold smoothness of the plug pressing against his rear. "You're going to have to learn eventually, my pet: you don't get to set the pace."

Blueblood felt the pressure on his back door increase, and did his best to relax. The plug was shaped more or less like a small egg, with the smaller end now pressing into his anal ring. It slowly eased into him, and a stinging pain began to flare up around it. He clenched his teeth and tried not to cry out, determined to at least accept this treatment with what little dignity he had left.

"Is something wrong?" Celestia asked. Blueblood's only answer was a frustrated grunt. The sun goddess sighed and pulled the plug away, allowing his opening to close once again. "You need to tell me if it's too big," she scolded. "I'm trying to train you, not hurt you. We're going to try again with more lubrication, and this time you'll warn me if it starts to be too much. Is that clear?"

Blueblood nodded meekly, still hiding his face. He heard a wet squirting noise, and squealed cutely as Celestia's hoof smeared some lube around his tailhole. A larger glob of it, guided by her magic, spread him apart and squeezed into his anal passage. "That should help," his aunt said as she reapplied the coating on the plug. "Now hold still, and remember what I told you. If it starts to hurt too much, tell me immediately."

Once again, the cold tip of the plug pressed against his anus. Blueblood forced himself to relax, and it began to slide in much easier than before. It was uncomfortable, of course, but it didn't hurt. The former prince felt Celestia's hoof against his flank, holding him still so that he wouldn't hurt himself by squirming.

As his passage opened around the plug's widest part, Blueblood let out a tiny groan of relief. That groan was cut off as Celestia stopped the toy's plunge into his body and held it still. "You still need to let it move slowly," she said. His ring tightened, trying to suck the rest of the toy in. "You'll see in a moment."

A new pain, this one quite different from having his hole forcefully stretched, made Blueblood grit his teeth. His anal walls ached at the pressure being put on them, and clenching amplified the feeling tenfold. His hooves clutched at the bed sheets as Celestia eased the plug deeper into him. "There you go," she said soothingly, and he felt the toy's base press against his rump. The ache intensified, but slowly his insides got used to the new sensation of being occupied.

"Well done," Celestia said as she gently rolled him onto his back. The change in position caused the ache inside of him to flare up, and he was glad when he could finally lie still again. "Take a while to get used to it," she advised. "It may not be comfortable right now, but before long you'll be able to move around without much difficulty. Practice makes perfect."

"At least this doesn't hurt like I thought it would," Blueblood reflected. "I suppose I'll have to get used to this sort of thing. I have a dreadful feeling that I'm going to be stretched like this quite often." He wiggled his butt experimentally, and was able to move without any further pain.

"Excellent," Celestia said. "Now that you're properly marked as mine, you can begin carrying out your duty." She carefully lifted him into the air, rotating him so that they were lying face to face.

"What duty?" Blueblood wondered. "I already did...did what she wanted. What else is she expecting?" Celestia's horn flashed, and the huge member that had frightened him earlier that day returned with a vengeance. "Oh. That duty."

"I realize that this seems a little demanding after what you've already done today," Celestia said. "But, if you hope to absorb any significant amount of magic, a magical endowment is the best way."

Calling the next hour uncomfortable would have been an understatement. Blueblood did his best, but there was just too much of Celestia to fit into his mouth. His dainty hooves were of some help, but he wasn't in a very good position to use them.

In the end, it was only with Celestia's help that he managed to get her off. After trying and failing to please her, Blueblood finally broke down and asked for help. The goddess was very understanding. With the aid of her magic he quickly brought her right up to the brink of climax.

"H-Here comes your reward," Celestia grunted, pushing deeper into Blueblood's mouth. Her sunny orange tip tickled his tongue. "Remember to drink as much as you can. You'll need all the magic you can get. I-I'm...I'm sure you don't want this punishment to laaaAAAaaast for....mmmm...longer than it has to!"

Blueblood's hooves kneaded her huge foal makers, and Celestia bucked her hips. With a wordless cry, she sprayed the inside of his mouth with her royal seed. The taste was bland and mildly unpleasant, but Blueblood forced himself to swallow it anyway. He could sense the magic in it, and every spark he consumed was another second he wouldn't have to spend on his knees in front of Celestia.

In very short order, the volume of spunk she pumped into him became too much. Celestia wasn't letting him up, and he couldn't swallow fast enough to keep it all down. First his mouth backed up, and then twin streams of cum burst from his nose before his gag reflex finally began to rebel against such treatment.

Just as he was starting to think that he would suffocate, Celestia released him. Blueblood gasped for air as he sat up, coughing and sputtering as alicorn semen dribbled down his face. "I believe I may have gotten a bit carried away," she admitted as he tried to wipe his eyes clean. "Sorry about that."

"D-Did I grow?" Blueblood asked once he had cleared his airway. He looked down at his body, but only saw a little bulge in his stomach. He felt a tingling around his midsection, but nothing more.

"I warned you that it would be slow going," Celestia said. "This is not going to be a quick solution." Blueblood nodded sadly, rubbing his belly. "You might feel better knowing that the effects are mostly noticeable after you digest. Most of that mass is going to be part of you by tomorrow."

Blueblood sighed. "Was there anything else?" he asked, dreading the answer.

Celestia pulled him toward her stallionhood once again, and Blueblood almost protested. "You need to clean me," she said gently, causing him to sigh with relief. He didn't think he could take another load like the last.

Blueblood lapped up any traces of cum that he could see, and decided that was good enough. "You did well," she said. "I expect to see improvement, of course, but this was a good first try."

Blueblood nodded and lay down next to her. She allowed him to recover from his ordeal, and he eventually nodded off. When he woke, Celestia had opened her book again and was idly flipping through the pages. Her wing was draped protectively over him, and in his sleep he had cuddled up against her midsection.

"This is so, so wrong," Blueblood thought as he tried to discretely slide away. "Oh, you're awake!" Celestia exclaimed, nearly giving him a heart attack in the process. "Excellent. As I was saying earlier, we need to find you something to wear. I've got a collection ready, but I'm having trouble deciding. I thought I'd let you pick."

Celestia's horn began to glow, and for the first time in days Blueblood began to get his hopes up. "I can decide what I want to wear!" he thought. "Perhaps this isn't going to be as...no, I suppose it will be exactly as bad as I feared. Let's not kid ourselves. Still, I have control over something. Silver linings, damn it all!"

There were several bright flashes at the end of the bed. Blueblood's mouth fell open at the choices in front of him, causing his aunt to chuckle. "What were you expecting?" she asked.

"Not this, certainly." Blueblood focused his magic, but his horn only gave a faint spark before going out. He was forced to crawl across the bed, accidentally shaking his backside and displaying the plug with Celestia's cutie mark on it far more than he wanted to. "Th-These are panties," he said as he lifted one pair.

Celestia nodded happily. "They certainly are. I also have a collar for you, but we can skip that if you like. Which would you like to wear?"

"None of them!" Blueblood shouted. "I'm not a mare!"

Celestia giggled, undoubtedly thinking that he could very easily pass for one. "I know that," she said. "That's part of what makes this so much fun. Nopony can see you, dear. This is just between us and your new friends, all of whom are sworn to secrecy. Go ahead and pick something."

He was sorely tempted to argue, but he knew that there would be consequences. Celestia was deadly serious about this being his only chance at redemption, so his choices were very limited. He just wished that he didn't have to choose between lace and frills. "I-I suppose the pink ones," he mumbled.

"Really?" Celestia asked, levitating the pair in question over to examine them. "I was so sure that you'd pick blue."

"The blue ones have lace," Blueblood pointed out. "Are we done here? I made my choice, didn't I?"

Celestia floated the panties over to him and grinned. "You certainly did," she said. "Put them on. Would you like the rest of the outfit that goes with them?" Blueblood reluctantly nodded, thinking that he might as well start showing some of that effort that his aunt was looking for.

Celestia watched as he struggled with the undergarments, clumsy without his magic to help him. "Allow me," she said after a while, and magically pulled them up his legs. The soft fabric caressed his backside, sliding over the plug and making his back legs tremble at the contact. "Not a bad fit. Let's get the rest."

"What else is there besides a collar?" Blueblood asked. Said collar materialized around his neck in a flash of light, and he tried to contort his neck to look at it. It was beautifully crafted silver band, padded with silk to make it comfortable. Celestia's name was elegantly engraved in the metal in golden lettering.

"What else?" Celestia wondered aloud. "Ah! These should match perfectly." Her horn glowed again, and a pair of pink socks floated out of the room's walk-in closet. "Put those on, Blueblood. Today your service officially begins. You are now one of my personal consorts. I'll have the rest of the outfits moved to your quarters. You may go now, if you wish."

Blueblood looked down at his sticky coat and cum-soaked hooves. "Must I go out like this?" he pleaded.

Celestia stared at him blankly, then lightly smacked her forehead with a hoof. "Oh, of course! How terribly absentminded of me. My apologies." She was kind enough to let him use her shower before he was forced to go back to his room. He was pretty sure that she was watching his flanks sway as he walked toward the bathroom door.

He had thought that she intended to share her bed with him, but when he asked about it she only laughed and shooed him toward the shower. "I have a bedmate for that," she said. "You've done your duty for the day, so I'll see you tomorrow. Don't forget to leave that plug in as much as possible."

Blueblood took a long time to clean himself off. When he left, Celestia was reading her book once again. He noticed a pony-sized lump under the blankets, curled up against the sun goddess's side. "Who could that be?" He wondered. "I don't remember Celestia mentioning that she had a special somepony."

Walking back to his room was...challenging, to say the least. Every time he moved, the plug in his rump rubbed him the wrong way. He finally had to resort to shimmying around, back legs held rigid like a paid escort after a productive night. He would have said that it was the most demeaning thing to ever happen to him, but...well, that ship had sailed. Fortunately, none of the castle staff noticed the strange way he was moving or his new wardrobe. It seemed that his aunt's illusion spell accounted for just about everything.

Finally, he made it to his room. Blueblood staggered between Crossfire and Gina, who were standing at either side of his door. "Are you alright?" the unicorn asked. Blueblood whimpered pitifully and tried to ignore him. As he pushed past them, he hoped that they wouldn't look at him too closely. The sun-branded plug was mostly hidden by his panties, but they might notice the way the fabric shifted over the flat base.

To his complete and utter dismay, Blueblood discovered Slipstream waiting for him inside. "What do you think you're doing in here!?" the former prince shouted, well aware that a blush was creeping into his cheeks. It was next to impossible to look intimidating while wearing panties, silk socks, a collar, and a butt plug, but he did his best. His size also didn't help matters. "These are my private quarters! Get out this instant!"

"No can do," Slipstream said with a shrug. "We were told to watch you."

"You can do that just fine from your post!"

Slipstream stepped aside and pointed to a group of horseshoes painted on the floor. "This _is_my post, Blueblood. Neither of us has any choice about this."

Too tired to argue, Blueblood turned out the light and crawled gingerly into bed. He knew that he wouldn't be getting much sleep, stuffed and sore as he was. Instead, he lay awake and thought about what it was going to take to earn his old figure back. It was a daunting task, especially if today was any indication.

"I'll be alright,"_he told himself. _"Chin up, Blueblood. Celestia isn't going to make this easy, but she wouldn't force me to do anything that I can't handle."

At least, he hoped she wouldn't.

---

This image of Blueblood, along with the image I used in the first chapter, are the two that inspired this story. Skipsy just draws him so...cuddly. Yes, those are the very panties he's now wearing. I also considered using this one. Sissy Blueblood and dominant Celestia. Mmmm.

Celestia doesn't come across as being horrible, does she? I tried to make her seem reasonable, insofar as that's possible with this kind of setup. I'm marking this as "semi consensual", because he could back out whenever he wanted. I think that's right, but I don't know for sure. What do you guys think so far? Don't be shy!