Author's Notes:

Title Drop already and it's not even the final chapter either.

It's been a couple of days since Starlight made a huge discovery. One two ponies who weren't there for when it happen would soon find out...

"Slow Down Pinkie..." Applejack said following her shuddering and bouncy friend. "Your saying that there's a doozy at Twilight's Castle?" She asked.

"Yep. My Pinkie sense has never steered me wrong. Plus, my party senses have been going off like crazy since two days ago." Pinkie Pie said. "So whatever the doozy is, it has to be connected to my party senses as both my Pinkie Sense and my party senses are going off at the same time. That's never happened before." Pinkie said as they arrived at Twilight's Castle.

"Woo boy...I bet we missed a battle or something..." Applejack said as they headed for the Map Room.

"Could even be that we might be going on a friendship mission. Two cousins on a friendship mission...that's gotta be a first." Pinkie Pie said. Applejack opened the map room doors, finding a pacing twilight, all their friends, and the CMC with their friends.

"Oh finally." Diamond Tiara said. "And what's with Pinkie Pie?" She asked.

"I think her Pinkie Sense is acting up. judging from the shaking she's doing, I'd say she's sensing a doozy." Rainbow Dash said.

"Gee, talk about a two day delay. We've already experinced the doozy I think she's been predictining..." Silver Spoon said.

"So ah was right...we missed some huge battle." Applejack said.

"Nope. No battles to be had. Unless you want to count Twilight battling against her own mind." Scootaloo said.

"Ditto." Sweetie Belle said.

"Yeah. That's really the only battle we've had for the past two days..." Rarity said.

"I'm still sensing a doozy. And it's only getting bigger..." Pinkie Pie said.

"Oh boy...should you just tell them, Starlight?" Apple Bloom said to a worried looking Starlight Glimmer.

"What's going on Starlight? Did Trixie do something bad?" Applejack asked.

"No! But I'd honestly prefer that over this!" Starlight said. "Especially over this..." She added with a sigh.

"Just tell them, Starlight." Fluttershy said. "Better to get it out of the way now before Pinkie starts going crazy." She added, pointing at a very jittery Pinkie Pie.

"...Twilight...mind helping me out?" Starlight asked her teacher.

"Fine...I could use a break from figuring out how I'm going to approuch my parents about what we've learnt." Twlight said.

"Wait...are you dating Starlight?!" Pinkie Pie exclaimed.

"What? No!" Both Starlight and Twilight said at once.

"Not only is there no romance connection going on between us..." Twilight said.

"But it'd be super icky and wierd and very very taboo." Starlight said.

"Um...come again? Taboo?" Applejack said. "Also, if I didn't know any better, for a moment, it was like the two of you were sisters." She said.

"Oh boy...that joke has run it's course now that fate's been tempted enough with that..." Starlight said. "Fine. So first off, I tested my DNA against my mothers to see where I came from as the whole thing with you and Pinkie Pie being related got me curious to see if I have some long lost cousin out there; one I wouldn't mind seeking out and connecting with. However, turns out, I'm not related to the mare that raised me as her daughter at all. In fact, there's a zero percent chance we're even related." She said. Pinkkie was still vibrating.

"Oh boy...the doozie's just starting...I can feel it..." Pinkie Pie said.

"So Starlight here dsecided to call her dad and he was insistent that he and his late wife both loved each other very much and were the parents she known them for." Twilight said.

"You didn't think to run your dad's DNA after?" Applejack asked.

"Well knowing what we know now, there's a mute point. I guarantee you, it'll also come out to be a zero percent probability. Because believe it or not...I'm adopted." Starlight said. That made Pinkie do the thing where she expands a bunch but was still jittery.

"Well that was quite the doozy but...my pinkie sense is telling me there's an even bigger doozie to come." Pinkie Said.

"Seriously? Just what could possibly top that?" Applejack said.

"Your going to regret asking that." Rarity said.

"Yeah...trust me." Twilight said.

"So I found this complicated test that would give you your closest familial match within equestrian boarders. I folllowed it to the letter and the result...pratically made everyone who wasn't the kids faint upon hearing it." Starlight said.

"So? What is it? What was so big that it would cause that kind of reaction?" Applejack asked.

"Me and Twilight...well..." Starlight gulped. "...Turns out...we're biological sisters..." She added. That made Pinkie Pie do her exploding and then faint alongside Applejack. Pinkie had stopped jittering.

"...And that I'm betting was the Doozy..." Twilight said.

"That...was the mother of all Doozies..." Pinkie Pie said.

"So...let me get this straight...this entire time that Starlight's been learning about friendship from us...she's been Twilight's sister?!" Applejack exclaimed.

"We are. I'm her little sister. Two years younger, in fact." Starlight said. "So...surprise?" She asked, nerviously.

"...It's times like this I hate being the element of honesty..." Applejack said.

"So...Starlight finding out she's Twilight's Sister..." Pinkie Pie said before suddenly getting her party cannon out. "...It's why my party senses have been going off like crazy for two days straight! Same with my Pinkie sense." She said.

"Uh oh..." Starlight knew what Pinkie Pie was gonna do. And she was right: Pinkie Pie fired her cannon and decorations went everywhere. There was even a banner that said "finding your family party" on it. Twilight face hoofed.

"I swear I'll never comprehend Pinkie Pie." Twilight said.

"Let me guess: You tried studding her Pinkie sense." Starlight said.

"Yep. How'd you guess?" Twilight asked.

"Sounds like something you'd do, big sis." Starlight said. "I guess I've just gotten to know you that well." She added.

"Yeah. And that's not a bad thing, little sis." Twilight said.

"Still, what are we going to tell your parents? Let alone Shining Armor!" Starlight said.

"Oh boy...I didn't even consider my BBBFF..." Twilight said and began pacing again.

"...And there she goes again, way to go Starlight..." Rainbow Dash said.

"To be honest...I'm half tempted to join her..." Starlight said.

"Yep...they are totally sisters..." Applejack said. "So when you mentioned that saying that you were sisters was an old joke..." She started.

"Yeah. First the girls who were here tempted that fate, then the CMC, and then you. The joke has officially run it's course." Starlight said.

"Oh yeah. You have to be Twilight's sister. That is very much something Twilight would say." Pinkie Pie said.

"And here I was ready to give a stern talking to to Starlight's Parents. Then I find out their Twilight's Parents." Rainbow Dash said.

"It's already bad enough that I wish me and Twilight knew what to say to help my biological family stomach this..." Starlight said.

"Oh boy..." Applejack said. This was going to be a long winter...