"Come on, Spike, where are you?" Twilight whispered nervously, glancing at the door and clutching her hind legs.

Forty minutes ago, the unicorn had felt the tea she'd been drinking with her friends begin to beg to come out, and she was horrified that she didn't know how to let it out. No, of course, she guessed how the stallion cock worked and understood what she needed to do. Except knowing it and doing it every day were completely different things. That's why she needed advice from someone who had already gone pee-pee a number of times. And of all the folks she knew, that was Spike.

"How long could he sit through a movie? Where the heck had he gone?" She wailed, glancing at the bathroom again, unsure if she should continue to endure it or go in there and do it herself at her own risk. Maybe she could wait for Spike to come after all. And then he would write a letter to Princess Celestia, and she would quickly teleport to her and undo those awful spell. And then the unicorn would have no trouble going to the bathroom like a normal mare.

"Exactly, she'll have me back to normal in no time, and I won't have to pee with this walking hazard," she said, glancing at the door once more.

Finally, after another twenty minutes or so, the door opened and a purple dragon entered the library.

"Spike, you're finally here! I urgently need you to..." the unicorn immediately rushed over to him.

"Wait, Twilight," he said, tossing a large soda cup into the trash. "I drank too much Mega-Dew and now I have to let it out, and then I'll do what you need. Be patient for a little while."

"Wait? Oh, why, why did you say that?!" Twilight squeezed out in agony as she watched her assistant go to the place she so badly wanted to be for the last hour.

Soon the treacherously loud sound of falling liquid began to echo from there.

"Oh, not again," the mare whispered, shrinking into a lump, not knowing how much longer she could endure without doing the most embarrassing thing in her life.

And then a very frightening thought occurred to her.

"What if I were to follow him unnoticed?" She thought. "For research purposes, of course. I must learn how to piss."

And, fighting her embarrassment, she carefully walked to the door and opened it slightly.

"That's it, I'll just watch him pee and leave right away," she consoled herself, peering cautiously into the bathroom, where Spike was sticking out his dragon wiener and peeing leisurely.

"Wow, so that's how it works, I didn't know it needed..." the unicorn whispered as she watched him.

"Twilight?" Suddenly a familiar voice came from behind her.

The mare flinched and turned back quickly. There, behind the open window, was Cheerilee, watching her with interest.

"Oh, hello, Cheerilee! How are you?" Twilight said in a whisper.

"I'm fine, Twilight. But… what are you doing?" The earth pony asked.

"Shh, not so loud. Spike is peeing right now, and I'm… watching," Twilight said the first thing that popped into her head, then turned away blushing.

"Oh," Cheerilee said with a nervous giggle and hurried away from the window. "What a strange family," she added quietly.

"Why? Why did I say that?" Mentally horrified Twilight, fearing that Cheerilee would now think of her as a pervert. But there was nothing she could do about it now, so she decided to just continue her observation to see how she could relieve herself.

However, as soon as she reached the door again, Spike came out.

"Well, I'm empty now, and ready to go back to work," Spike said with a towel on his claws. "So what did you want to ask me, Twilight? Should I write you another letter?"

"Yes, Spike," the unicorn said, crouching painfully. "But first I'd like to, um..."

"What?" Spike asked, noticing her confusion.

"Well... I..." she mumbled.

Twilight wasn't sure if she should tell him about her problem. After all, it was a rather delicate matter, and she hadn't planned to share it with the young dragon that was practically like a little brother to her. But if she didn't, something worse might happen that would still expose her, but as a puddle left on the floor.

"Oh, no! I've suffered enough, and don't want to wet my tail," she decided, and, still hesitating, she said aloud:

"Okay, Spike, I want to ask you something very important. But first you have to swear you won't tell anypony about it."

"Of course, Twilight, you know you can always count on me," the little dragon said, squinting curiously. "Whatever your secret is, I'll keep it safe and not tell anybody."

"Oh, fine. And..." she swallowed nervously, "Promise me you won't laugh."

And with these words, she spread her hind legs, exposing her impressive-sized cock, which had grown again and was now literally reaching the floor.

"Wow!" Spike gasped in surprise, taking a few steps back from her. "Where'd you get that?"

"I don't know," the unicorn said, twitching her eyelid nervously. "Cockatrice attacked me this morning and turned into stone, and then, when I was back to normal, I... uh, I got it."

"Cockatrice?" Spike asked incredulously. "Did he do it?"

"I think so," the mare confirmed.

"I don't understand. How could he..."

"Look, Spike, it doesn't matter! I've got to get rid of it as fast as I can! But it's not easy. Only an alicorn can do that kind of magic. So you have to write a letter to Princess Celestia and ask her to, um, remove my penis."

"Yes, I understand. Okay, I'll write her right now," the dragon nodded, and was about to go upstairs to get a pen and paper, but Twilight stopped him.

"Wait, that's not all!" She said.

"Is it?"

"Yeah. Before you write to her about my problem, I'd like to ask you one more thing."

"Okay, what is it?" Spike asked.

"I'd like... um... I'd like..." she started uncertainly.

"Yes?" Spike said impatiently, twirling his paw.

"That you... uh... teach me to pee."

"What? Teach you to pee?" The little dragon repeated, barely able to keep from laughing.

"Yes, to pee. I've had this cock since this morning and I've never... um... relieved myself before and I have no idea how to do it properly," said Twilight blushing like a tomato. "So, could you teach me how to pee like a stallion?"

She turned away from him embarrassedly, waiting to see what he would tell her. Deep down, the mare feared that Spike was about to laugh at her, but he just put his paw on her shoulder and said with a smile:

"Of course, Twilight. Now I'll tell you all the secrets of this great deed, which is honed by years of hard and grueling training. So, first you have to put it forward and..."

***

"That's it, now all we have to do is waiting," Spike said, burning with his fiery breath the letter in which he described Twilight's problem and asked the princess for help. "I'm sure Celestia will figure out how to make you back to your old self in no time."

"I certainly hope so," the unicorn said, shifting her legs in embarrassment. "I wouldn't want to keep walking around with dick. It's a real nuisance. How do the stallions carry it? It's so uncomfortable."

"It's a matter of habit, Twilight," Spike shrugged. "Of course, it's a little different with dragons. We keep it inside, but it's pretty much the same, since we live with it all our lives we ignore it, so I suggest you do the same. Just pretend you don't have one."

"No way! I'd rather wait until it's really gone! And once the princess takes it away, I'll go back to being a mare with a normal genital organ."

"Normal?" Spike squinted. "Isn't a penis normal?"

"I mean for a mare. Don't mince words," Twilight snapped back.

"Okay. If you say so," the little dragon agreed. "By the way, while we're waiting to hear back from the princess, I'd like to get something to eat and have a glass or two of juice. Would you care to join me?"

"No! I don't want to fill my bladder anymore!" The unicorn shook her head.

"Aw, come on, I already showed you how to pee. So it should be easy for a talented pony like you to put your knowledge to work," the dragon said with a cheerful grin.

"Ha-ha, very funny, Spike," the mare said sarcastically. "But I'm not laughing now; I don't want that "thing" between my legs with those big..."

She looked embarrassed at Spike and didn't finish her sentence, confining herself to a brief statement:

"When is the answer coming?"

About half an hour passed. Spike went to the kitchen and made himself and Twilight a couple of sandwiches, which he set out on the table in front of her. Then he brought two glasses of apple juice and the unicorn, after a little hesitation, changed her mind and took a cheese sandwich and ate it slowly, drinking the juice and talking to her assistant about everything that had happened to her during the day.

After a while, Spike felt something stirring inside him, and he opened his mouth wide and spat out a scroll of Celestia's answer in the green flames.

"At last she has written! Come on, Spike, read it soon!" The unicorn said, quickly plopping down in her chair and accidentally landing on her balls. "Ouch! It hurts! I can't get used to them! Do balls have to be so sensitive?!"

"Careful, Twilight, you can hurt yourself," the dragon sympathized her, unwrapping the letter and a couple of times coughed, read aloud:

«Twilight Sparkle, my prized pupil, what you've written to me is terrible, and I'll get right on it. However, finding the right spell will take time. Not to mention practice. Because even I, with all my magical experience and skills, don't remove unwanted offshoots from other ponies' bodies every day. So I'll have to practice on inanimate objects before I can cast the spell on you. I don't want you to lose anything else, like your leg or head, so expect me to visit at the end of this week, when I've found the spell and am sure it will work.

Your mentor and friend, Princess Celestia.»

"What? At the end of the week?" Twilight gasped in fright as she looked at the calendar on the wall. "But it's only Tuesday. Do I have to walk around like this for six whole days?"

"Well, you heard what she wrote – it's a very difficult spell, and she needs time to try it out. So you'll have to wait until she..."

"Wait? Are you serious?" Twilight exclaimed, jumping to her hooves. "Spike, I can't live with this thing for a day, let alone a week!"

"Well, you've already lived one day with it, so don't exaggerate," Spike tried to reassure her. "Besides, you said yourself Rarity will make you a dress tomorrow and you can wear it without drawing attention to yourself. So don't worry. You'll be fine."

"Yeah, you're probably right," the unicorn said doomfully, sitting back down in her chair, almost hitting her balls again. "Ouch!"

"Come on, cheer up. After all, you've got us, your friends, and me, Maestro Spike, to give you a ton of good advice on how to use your 'big fella,'" Spike said cheerfully, patting her on the shoulder.

"Yes, Spike, thank you," the mare said, and leaned toward him and hugged him lightly. "You're absolutely right, I'm worried for nothing, I'll be fine," she whispered.

"That's the spirit! And now let's do something to distract ourselves. It's been a long day."

"I agree. I'll look through some books."

"I'll do the cleaning. Oh, by the way, Twilight, is that an extra leg down there, or is you just happy to see me?"

The unicorn glared angrily at Spike.

"Just kidding, don't look at me like that," he winked.

***

"Good night, Spike," the mare said in the late afternoon.

"Good night, Twilight, sleep well," the dragon said with a loud yawn as he climbed into his basket and curled up.

The unicorn habitually jumped onto her bed, but immediately clutched her balls again.

"Oh! Not again! Every time the same! How uncomfortable they are!" She grumbled, wrinkling in pain and carefully spreading her legs.

She'd banged her balls five times today, and the pain was unbearable.

"Well, now I understand why stallions always spread their legs so wide. Walking with that thing is terrible," she said, wrapped in a blanket. "It's a lot easier for them, though, of course. They're all so much bigger and taller, and their dicks obviously fit their figures, not like mine."

She rolled over onto her side and felt uncomfortable again.

"Also, they live with them all their lives and, as Spike correctly pointed out, get used to the discomfort they bring. That's all right; just a week and I'll be a mare again. Yeah, I'll definitely make it."

She closed her eyes and began to fall asleep and, as usual, indulge in mild erotic fantasies. Yes, Twilight liked to fantasize before going to bed about strong and sturdy stallions that could take her on their hooves and hold her against their sturdy, brawny bodies. And then, caressing her tender croup, lay the unicorn on her back and begin...

"Oh no!" Twilight whispered, suddenly opening her eyes, as she felt a stirring begin beneath her.

She lifted up the blanket and saw her cock begin to stretch out.

"I had completely forgotten that when stallions get horny, their dick starts to grow," she thought, sweating, trying to pull it away, but nothing worked.

"Come on, stop growing, or Spike will notice," she whispered desperately, holding onto it with both hooves and glancing at the little dragon who might just wake up. But no matter how hard she squeezed or rubbed it, it continued to harden until Twilight suddenly realized that she was enjoying it.

"Wow, that feels good. It's so sensitive when I rub it. And so firm," the mare giggled softly, as she stroked her cock with both hooves and felt a new flow of pleasure with every stroke. And then a very bold idea occurred to her.

Taking one more look at Spike and making sure he was sound asleep; Twilight ducked under the covers, then lit her horn and gently touched her cock with telekinesis.

"This is so... delightful," she immediately moaned muffled as she felt an incredible sense of pleasure take over her cock. She ran her telekinesis over it several times, gently caressing its head with the magic, then, without hesitation, began to rub it rapidly.

"Yes! Like this! Back and forth, back and forth, this is just great! I never would have guessed that stallions felt so much pleasure when they did that! Oh, I've never felt so good! That cock is fabulous!"

She masturbated vigorously for a few minutes until she felt a sweet cramp run down her cock and something came up sharply at the very tip of it. Twilight squeezed and with a groan let out a powerful stream of cum that drenched her legs and stained the blanket.

"Oops, looks like I overdid it a little," she whispered, breathing loudly. "Stallions cum a lot harder than we do. Now I'll have to wash all this. And preferably as soon as possible, before Spike sees it."

However, no sooner had she stood up and thrown back the blanket than a sudden wave of warm slumber hit her.

"But I'll get some rest first. I'm tired. Yeah, I'll just lie down for about five minutes and then I'll get right down to it. Now... just a second," she whispered, yawning, and then fell asleep soundly, smiling happily and holding onto her gradually shrinking cock.

Author's Note

So Twilight is slowly getting used to her new cock, knowing that all is not lost and that Princess Celestia will help her at the end of the week. Wondering what will happen to her before then? And how will she hide her "big friend" from the rest of the ponies? You'll find out all the answers in the next chapter