They both laughed openly as each one did their best to surpass the other while running. It wasn't long though, before Rarity took the lead again. This didn't bother Twilight one bit, as she enjoyed the sight it offered her. What the nerd didn't expect however, was for her friend to stop so suddenly in front of her, causing them both to collide.

"Oof!"

"Ouch!"

Both girls rubbed their heads while laying besides each other, as well as rid the rest of their bodies of any dirt, twigs, or leaves.

"Why did you stop so fast?" Twilight asked, still rubbing her head.

"Look." Rarity replied, pointing over a couple bushes at Canterlot High.

The sciencey girl stared at the school building, not quite catching on yet.

"Yeah? It's the school."

"Well, I know that. What I'm saying, is there's no one there at this time of evening." Rarity stated with a hint of a smirk curling on her lips.

It didn't take long before the nerd caught on, making her eyes widen again. "Are you really suggesting what I think you're suggesting?"

"Yes, yes I am. Let's streak through the school." The fashionista giggled giddily.

"Oh, I don't know…." Twilight responded with worry.

"Trust me on this. There's going to be no one here except us." The fashionista replied reassuringly.

"Well…." The sciencey girl muttered, tapping her fingers together while her mind debated whether or not she should go along with this.

"It'll be fun." Rarity said, smiling and placing a hand on her nervous friend's shoulder.

"Alright, if no one else is there, sure." Twilight smiled back, deciding to go along.

The fashionista clapped her hands eagerly, looking back at the school. "Ooh! This is going to be so much fun!" She practically squealed in delight.

Twilight instead, looked back down at her friend's hindquarters, noticing something. "Um, Rarity, you still have a leaf stuck to your butt."

Rarity peeked behind her, confirming that she did in fact still had a leaf stuck to one of her butt cheeks. "Oh my, you're right."

For a split second, the fashion girl's face filled with dread.

"What's wrong?" Sci-Twi asked.

"It's not poison ivy is it!?" Her friend exclaimed.

"N-no, I don't think so." Twilight responded.

"Well, can you check?" Rarity asked, smiling awkwardly at her spectacled friend.

"Sure thing." The nerd replied, getting down on her knees and lowering her head so that it was on eye level with Rarity's bountiful backside. She found herself staring in awe once again, forgetting how big it is up close, and just how much it tended to jiggle unintentionally.

"Well, is it?" The fashionista's voice broke Twilight out of her trance.

"Oh, no. It's not."

"Oh thank heavens." Rarity breathed out in relief, before peeling the leaf off of her bum. She grinned and rubbed it on her friend's cheek, before discarding it.

"Umm, what does that mean?" The nerdy girl asked in puzzlement, blushing a little.

"Oh, it's nothing dearie." Rarity giggled, causing her confused friend to blush more.

After a moment of awkward silence, both of them went back to looking at the school again, with each of their hearts beating heavily.

"On the count of three, we'll both run across the street, and duck into the bushes around the school." Rarity stated, to which Twilight nodded in agreement.

"Got it."

"You ready?"

"Ready!"

"One…"

"Two…"

"Three!" The two girls yelled as they sprinted across the street. In a few seconds, the two girls had crossed the empty street, and ducked right behind some bushes next to the school. They both huddled close to each other, each of their bodies warming themselves.

"Ow!" Rarity cried out.

"What's the matter?" Twilight questioned, slightly concerned.

"I felt a twig poke my bum." The fashionista groaned a little, rubbing her derriere.

"Phew, thought it was something worse." Twilight responded, looking up from their hiding spot.

"I see no other cars or people coming by at the moment."

"Good, let's check to see if the door is locked." Rarity said, quickly jumping out from the bush and zipping over to the school's doors. She grabbed the handle and pulled. Unsurprisingly, the door didn't budge. Wanting to avoid being out in the open for too long, Rarity hurried back to the bush her friend was hiding in, ducking behind it.

"It's locked."

"Figures."

"Well, what should we do now?"

"Hmm, let me think."

Twilight rubbed her chin in thought, peeking her head out of the bush again and looking around the school.

"Maybe there's a slim chance someone left a window open?" The sciencey girl suggested.

"It's worth a shot." Rarity replied.

"Although… given the size of our posteriors… we just might not be able to squeeze through unless it's a large one…" Twilight pointed out.

"True… but as I said before it is worth a try." Rarity declared, determined.

"I agree." Sci-Twi nodded, peeking once more out of the bush. "Let's stay hidden in these bushes and go around the school. Maybe we'll find a window."

"Yes, let's."

The two naked girls maneuvered their way through the bushes along the school's walls, keeping an eye out for any openings while doing so.

"See anything yet?" Rarity asked, looking around.

"Nope, not yet." Twilight replied, continuing through the bushes.

"Wait, do you hear that?" The fashionista spoke up, hearing the sound of a car's engine getting closer. "Stay still!"

Both girls hunkered down low to the ground, trying their best to not move an inch. Rarity lowered herself low against the grass in front of her friend, meaning her big white behind was directly in front of the spectacled girl's vision.

The nerd sweated nervously as the car's engine got louder, while she focused on the round, jiggling, twin globes of Rarity's enormous booty. Her whole face was as red as beet, having no choice but to endure staring at the fashionista's giant butt, just centimeters away from her face.

While remaining absolutely still, with her friend's ass right in front of her, she noticed how tense it looked, no doubt from the fashion girl being nervous. As the car passed by them, both of them shivered just a bit, and felt their butt cheeks instinctively clench.

Once the engine from the vehicle grew fainter and fainter, until it could no longer be heard, the two streakers breathed out heavy sighs of relief. Twilight lifted her head up, no longer having to be right by the fashionista's large ass, although she really didn't mind it.

"Phew, glad that's over. For a second there, I was afraid you might…" Twilight caught herself, stopping before saying anymore.

"Afraid I might what?" Rarity inquired, looking behind her with puzzlement.

"Oh, it's nothing, really." The spectacled girl offered her friend a worried smile.

"Oh really?" Rarity bemused, not believing her.

"Yes, really." The nerd responded quickly, her face sweating like crazy.

"Hmm, sure…." The fashionista responded, looking back ahead of her. "Well, let's continue."

As soon as Rarity turned her head to face in front of her, Twilight's eyes widened to the size of saucer plates, her whole body running cold.

"Um, Rarity?"

"Oh, what is it now?" Rarity questioned with annoyance, keeping her eyes locked ahead of her.

"Whatever you do, don't move."

Now it was Rarity's turn to be worried. Chills ran all through her naked body as she did her best to stay in place.

"Twilight, I don't like the tone of your voice right now." She gulped, beads of sweat forming on her forehead.

"Don't worry, just let me handle this." Twilight said, picking up a stick and cautiously bringing close to the back of Rarity's head.

"Handle what? Twilight?" Rarity's body was shaking like a leaf, her heartbeat rapidly increasing while anxiety invaded her mind. Even though she fervently wanted to deny it, the fashionista was almost certain she knew what was going on.

"Twilight…. I want you to be honest with me. Is there a bug on me?"

Twilight ignored her friend, instead focusing on getting the stick closer to the fashionista's hair.

"Just get on the stick little guy." The science girl muttered to herself, much to the discomfort of her nervous friend.

"Twilight why aren't you…" Rarity paused upon feeling something move along her hair, something with many, many tiny legs. At that point, she couldn't keep her emotions inside for any longer.

"GAAAAAAAHHHHH!"

Twilight flung herself back in surprise from the sudden shrill cry, covering her ringing ears while her friend flipped out, frantically waving her arms everywhere and feeling all over her body.

"Rarity! You're making too much noise!" Twilight warned, her words not registering to the panicking fashionista.

"Is it still on me!? Is it!? Is it!?"

As Rarity bent forward and started wildly brushing off her legs, that's when Twilight saw it. The little eight legged nuisance that was causing so much trouble, was spotted directly on the fashionista's right butt cheek, not moving a smidge.

Twilight narrowed her eyes at the bug, knowing full well she couldn't let it get away this time. Without fully thinking it through, the spectacled nerd raised her hand up high, her eyes locked dead set on her target. Then, with one fluid swift motion, she swung her hand down right onto it.

SMACK

"OW!" Rarity jumped up in shock, quickly rubbing her stinging posterior, which now had a faint pink hand print on the right cheek. "What was the meaning for that!?"

"Look." Twilight simply stated, pointing at the ground behind her.

The startled fashionista looked where her friend was pointing at, soon figuring out what she meant. A spider was seen dead on the ground, it's legs twitching. The thought of that thing was just on her derriere mere seconds ago, made Rarity shudder and her face contort in disgust.

"Twilight, you could've warned me before doing…. That." Rarity said, still rubbing her slightly sore behind.

"Sorry… but hey, at least it's gone now." Twilight offered her friend a cheeky smile.

Rarity sighed in exasperation. "Well, I guess you're right. Thank you. But warn me next time!" She asserted, to which the science girl nodded.

"Duly noted."

Next Chapter: Chapter 16 Estimated time remaining: 3 Hours, 32 Minutes