At this point Twilight's erection had finally calmed down, which made it a bit easier to focus on finding a book to rid her of this nightmare.

"No... that's not it... there!"

She excitedly pulled a book off of the shelf titled Magical Mishaps: What To Do When You Suck At Magic. While she didn't like the title much, the information inside was all good.

The purple-haired magician began frantically flipping through the pages until she reached the section on sleep casting.

The section read "sleep casting is a phenomenon similar to sleep walking, but instead of moving around the person is using magic. Sometimes even casting spells the mage is unaware he or she knows. This is not an uncommon occurrence for young, inexperienced, no talent..."

For about half of a page, the book continued to use insulting adjectives but Twilight felt the need to read all of them as a punishment for letting this happen. When she finally reached the end, her ego was completely shot.

"...Worthless, bad magicians as they often have yet to develop much control over their magic. If a spell cast during sleep has lingering effects, such as changing the size, shape, color, etcetera of an object, it is not advised to attempt to revert the object to it's original form.

"This is because often times the next time that person sleep casts, the spell he or she will cast will be the counter spell for the first spell he or she had cast. If the counter spell is cast on a object where that spell no longer is being applied there can be complications. Such as permanent damage or warping."

Her heart sank, she felt a lump in her throat, and for the third time today Twilight broke out in a sweat. If her dick wasn't already flaccid, it certainly was now. She couldn't fix herself, at least not right now, and on top of that she had no idea when she was going to sleep cast again so she might be stuck like this for a while.

Disheartened, Twilight put the book back onto the shelf and dragged herself over to the closet to retrieve the party decorations. She wasn't in the mood to party though, in fact she wasn't in the mood to do anything but crawl back into her bed and live there forever.

As the purple mage took out each streamer and balloon, she meant to hang them up but instead just tossed them to the ground.

"Eh, good enough..." she muttered.

Suspiciously, the balloons were already filled with helium, but Twilight was just too down to care to wonder why. She was so down that the helium was affected and balloons fell limply to the floor. She slumped to the floor and closed her eyes she felt she could just fall asleep right there.

Just then, Spike walked in with the cupcakes in hand.

"Yo Twi! I'm back! Did you set up the... decorations?"

Upon seeing his big sis sitting in the middle of the floor and the party decorations strewn about Spike immediately knew something was wrong. He put the cupcakes on the table and ran over to comfort her.

"Hey Twi what's wrong? Did you forget how to put up the decorations? Don't worry I'm sure it's not that hard, we can figure it out."

Spike reaches over to one of the streamers to pick it up but Twilight grabs his hand.

"No! Leave it there! That's exactly where I want it!" she yells as she squeezes Spike a little too hard.

"T-Twilight stop! What's gotten into you?!"

The anger drained from Twilight's face and she let go of his hand.

"Oh Spike I'm so sorry! I-I just..." she said as tears began to fill her eyes.

*Ding-dong*

"Whoa they're here," said Spike as he trotted off to go answer the door.

"Hey! What about me?!" thought the poor girl as she tried to regain her composure.

Pinkie and Rarity enter the library, both holding gifts.

"HAPPY BIRTHDAY!!!" shouted Pinkie as she ran up to Twilight and gave her a, very tight, birthday hug.

During this, Pinkie's breasts squished up into Twilight's face which made her feel a tingle in her loins.

Uh oh.

"P-Pinkie! Don't squeeze me like that!"

Twilight pushed Pinkie away from her and took a moment to regain her lost breath, and hopefully stop her dick from getting hard again.

Rarity gracefully strode over to the lucky birthday girl to greet her. Rarity was wearing a beautiful, glittering dress made from pearl white silk with blue gemstones interwoven into the fabric. By far though, the most noticeable thing about it was how incredibly low cut it was, it showed off quite a lot of her cleavage.

"Happy birthday darling! I love what you've done with the decorations! It's so artsy I... um Twilight? Are you alright?"

Twilight had gone wide-eyed staring at Rarity's infinite bosom, and consequently her penis was becoming hard at an incredibly fast rate. There was nothing she could do at this point other than run, and so she sprinted straight into the bathroom, locking the door behind her.

"Spike what't gotten into Twilight?" Rarity inquired.

"Huh? Oh she's fine..." he muttered. He was far too enchanted with her chest to put any thought into his response.

"Well if you say so..."

From inside the bathroom Twilight was close to having a mental breakdown.

"Gosh dang it Rarity, why do you have to have such a great pair of boobs?! Man this dick is becoming such a hassle! You stupid thing!" she thought whilst cursing her bad luck.

She lifted up her skirt to take another look at the terrible attachment. Twilight reached down and pinched her penis hard with he thumb and first finger, it immediately went flaccid.

"W-Wait... what? That's all I had to do? Well that was easy," she said aloud.

There was no more reason to remain in the bathroom so, feeling much more relaxed and content, the purple-haired returned to her friends. If she hadn't been freaking out so hard she might have noticed that her pajamas had mysteriously disappeared off the bathroom floor.

"Oh Twilight! There you are! I was so worried, are you alright?" Rarity asked.

"Yeah I just suddenly needed to pee really bad is all."

"Oy that happened to me once I had to pee so bad that I exploded and there was blood and guts everywhere and it was really gross!" said Pinkie in one breath.

"Yes Pinkie, we all remember that. You don't need to remind us," is what Twilight said, but in all honesty she was a little glad to be reminded of such a grotesque image as it helped keep her from getting another boner.

There was another knock at the door. When Spike answered it Applejack, Rainbow Dash, and Fluttershy walked in.

"Sorry we're late egghead, we had to fight off ten million timber wolves on the way over here," stated Rainbow with a contented expression on her face.

"Could you not call me that on my birthday of all days?"

"Oh fine, egg birthday head."

"Egg birthday?! Ooh I had one of those once! I..."

"Can it Pinkie," said the exasperated magician girl.

The party continued without incident for a while, that is, until the presents were being opened.

"Here ya go sugar cube, open mine next," suggested Applejack.

Twilight took the small, round package and unwrapped it.

"It's... an apple. Uh, thanks AJ,"

"That aint just any apple, it's The Apple."

"Whoa dang, are you sure I can have this?"

"Yeah whatever."

"Oh here, just open mine already darling, I sure it's the one you've been anticipating the most," commanded the breasts in a white dress.

Twilight reached into the big bag Rarity handed to her and pulled out a glittery, blue dress.

"Wow Rarity! This is so pretty, thank you!" exclaimed Twilight.

Rarity was giving Twilight an expectant look.

"W-What is it?"

"Well aren't you going to try it on?" Rarity asked.

The lump returned to Twilight's throat. While the dress was very nice looking, it also appeared to be quite formfitting, so much so that the bulge between her legs would be immediately apparent if she were to put it on.

"Oh! Uh, right... try it on... Well you see I, uh, don't think that's a good idea," muttered Twilight.

"Why, whatever do you mean?"

"It's just that... I've... uh... gained some weight! Yeah that's it! I think I gained a few pounds recently, so the measurements you had for me when you made it aren't correct anymore. If I tried to put the dress on I might tear it and that's the last thing I want to do after you worked so hard on it."

"Hmm, well when you put it like that I guess I can't really argue," said an obviously disappointed Rarity.

"Really Twilight? I thought you said yesterday that you had lost two pounds?" inquired Spike.

"Well then I guess my diet is working," growled Twilight through gritted teeth.

"Diet? Didn't you eat a big bowl of ice cream last night?"

"Yes Spike. That's just part of the diet."

"Oh yeah! Didn't you say something about wanting to help Rarity out with her dress making?"

"Really?! That sound's wonderful darling! I've been so busy at work recently, having an extra horn would be great! How about you come over tomorrow at noon?"

If he wasn't her mailbox Twilight might have started strangling Spike right then.

"Sound's... awesome... I'll be there right on time," mumbled the poor, exhausted girl.

"Awesome? Sounds pretty troublesome to me," added Rainbow Dash.

Twilight would have argued, but at this point, she honestly could not have agreed more.

Author's Note

In case anyone doesn't catch it, the fact there isn't any punctuation in some of Pinkie's lines is because they are supposed read very fast, but I'm sure you already knew that.