Sunset's M-ASS-IVE discovery

Early the next morning, Sunset awoke to the feeling of her pajama pants somewhat tighter than normal. She soon discovered the reason as she changed clothes. Sunset's ass had somehow nearly doubled in size. The discovery almost made Sunset scream out of fear at the sight. Sunset was trying to think of a way to explain when she heard Applejack calling her from outside her tent.

"Hey, Sunset? You up yet sugarcube?"

"Y-Yeah, I'm up. I'll be there in a minute." replied Sunset.

"Alright. We'll be waiting then"

As Applejack left to rejoin the others, Sunset frantically looked through her clothes to see what could fit her new size. She quickly came across a pair of pants that seemed like they had just enough elasticity to cover her bigger assets. Sunset was somewhat relieved to discover that her panties still fit to a point before she attempted to put on her pants. It took her several attempts, but Sunset eventually got her pants before turning her attention to finish getting dressed. Once she had the rest of her clothes on, Sunset left her tent hoping that no one noticed her butt increased size.

"There you are darling. We were wondering what was taking you so long." said Rarity

"Sorry. I had some difficulties with what to wear today." replied Sunset.

"Your outfit looks good. Although, something seems different about you today.” said Rarity taking a good look at Sunset.

"Who cares? She's here now, let's just get on with our day. Right Sunset?" interjected Rainbow slapping Sunset on the ass, before heading to the nearby nature trail.

The sensation of Rainbow Dash smacking her ass sent a wave of pleasure through Sunset's body. She did her best to hide the fact that she liked it, but a small blush found its way onto her checks. Fortunately, the others had started to follow Rainbow Dash to the trail. The girls spent most of their day traveling down an old nature trail that is somewhat difficult for Sunset since her new size meant that she was slightly slower than her friends. On top of that, Sunset was also trying not to rip open a hole in her pants. Sunset's slower pace was soon noticed by Pinkie Pie.

"Hey. Why are you walking so slow, Sunny?" asked the party planner using her nickname for Sunset.

"Oh. I'm just enjoying the scenery is all." replied Sunset still worried about new enhancement getting spotted.

"Yeah. This place is pretty nice. A place like this can really grow on you.” said Pinkie as she looked around

Sunset felt the same tingling sensation in her ass as last night. The only difference was that the sensation felt stronger than last time. Luckily, Pinkie was still looking at their surroundings to notice a small shiver run up Sunset's spine. As the two girls continued talking about different things, Sunset couldn't help but notice that her pants were getting even tighter. The tightness only grew until *RIIIIIP*. A loud tearing sounded through the area causing everyone to look at Sunset, whose face had turned a deep shade of red. Her pants had torn completely to reveal her butt's new size. Sunset just stood there in silence for a few moments out of complete embarrassment while the others merely stared. The tension was broken when Rarity asked the question that was on the group's mind.

"What on earth happened to you, Sunset?"

"In all honesty, I don't know. I woke up this morning and noticed that my ass had gotten bigger." replied Sunset.

"Do you have any idea how this could have happened?" asked Twilight.

"Not really. Nothing like this has happened to me before."

"I wonder what could cause it. I mean, no one's rear end just growing for no reason." Said Applejack.

"As much as I would like to continue this conversation here, maybe we can finish it back at the campsite?" suggested Sunset.

The others agreed since none of them wanted any surprised guests dropping on them out of nowhere. The walk back took longer due to Sunset's ass being four times its size from yesterday. It also didn't help that Rainbow Dash and Pinkie Pie kept trying to play her butt every chance they got. Eventually, the group managed to return to their campsite safely and started trying to figure out how Sunset's rear end got so big. They eventually came to the conclusion that it was the pendant that Sunset discovered last night. The next question they had on their minds was, what caused the pendant to make Sunset's butt bigger.

"It could be a word or a phrase." said Twilight.

"The only problem is that, we don't know what it could be."

"That's not completely true, darling. I have a feeling that whatever the trigger is, it's very specific. Otherwise, your backside would be continuing growing right now." said Rarity.

"You make a good point, Rarity. In the meantime, I need to return to my tent. All this cool air feels weird on my ass." said Sunset getting back to her feet with some difficulties and made her way to her tent.

Sunset could feel her friends staring at her enlarged butt as she walked the short distance to her tent. She could feel it bounce slightly with each step. Once back in her tent, Sunset went over each time her back side had expanded to see if she could figure out what caused the growth. Unfortunately, Sunset just couldn't think of any specific word that would make her ass this huge. She pulled out the pendant from her shirt to get another look at the picture on it.

"Hard to believe that all of this comes from something ordinary. I wonder what word triggers this thing to make my ass grow.” said Sunset laying down on her stomach.

Once again, Sunset felt that tingling sensation in her rear end that sent a stronger shiver up her back. The sensation had also gotten even stronger as well. Sunset also noticed that the pendant was glowing. It was at this realization that Sunset knew what the trigger word was. Her theory was soon proven correct moments later as her butt grew to the point where it could match a yoga ball in size. Sunset was both relieved and nervous at the discovery of what the trigger word was. Sunset felt that it would be better to wait until tomorrow to tell her friends about what she had found out. Sunset spent the rest of the day getting used to the new weight of her ass.