Suddenly Sisters 2: Biological Connection

by Timeman202

Rating: everyone
Tags: Main 6, Drama, Rainbow Dash, Cutie Mark Crusaders, Scootaloo, Adventure, Slice of Life, My Little Pony: Friendship is Magic, Alternate Universe
Length: 4556

How far does one go for loyalty? Scootaloo is about to find out...

A few months have passed since Starlight Glimmer found out she was the biological sister of Twilight Sparkle; causing her to bound with the Alicorn and her friends like never before. After loosing to the new sisters in the sisterhooves social, the CMC alongside Diamond Tiara and Silver Spoon are now forced to chart out their own family trees. One of them is about to discover that a pony they've looked up to and been mentored by is more to them then they had ever known and reveal a well kept secret.

A/N: This is a sequel to Suddenly Sisters - Fimfiction
It is very much recommended you read that story first so you have an understanding behind this story. This also takes place directly after that story's epilogue so during season 7 but not too long after the events of this story's prequel. A day or two later at most.

A/N 2: Just like with it's prequel "Suddenly Sisters 2: Biological Connection" while rated E deals with the concept of adoption. If you don't like this concept, don't read. And while comments and ratings are enabled, if you all can't behave yourselves and avoid leaving hate comments, I won't hesitate to disable comments and ratings. You all behaved yourselves with "Suddenly Sisters" and I expect those who don't agree with Scootaloo being Rainbow Dash's biological sister to avoid leaving hate comments.

A/N 3: The idea of Scootaloo being Rainbow Dash's Biological sister comes from the story "Dear Scootaloo" which is part of the "Dear CMC" series made by Jade Ring. You can check out Scootaloo's part here: Dear Scootaloo - Fimfiction
You do not however need to read "Dear Scootaloo" or any part of the "Dear CMC" series to be able to enjoy this story; in fact this is an entirely different cannon from the "Dear CMC" series. The only story you need to read to understand this one is "Suddenly Sisters".

A/N 4: Also, unlike "Suddenly Sisters", the entirety of "Suddenly Sisters 2: Biological Connection" is told in first person from Scootaloo's P.O.V. so if you don't like that, don't read this.

Main MLP Series: Friendship is Magic
Main Genres: Adventure, Alternate Universe (for safety), Drama, and Slice of life.
Main Characters: Scootaloo, Rainbow Dash, Cutie Mark Crusaders, and Main 6

Published 2020-12-29 21:00:00 UTC
Last updated 2020-12-31 07:46:04 UTC

Prologue: Up to Speed

Hi, my name is Scootaloo and it's probably best if I catch everyone up to speed at what's happened in the past year.

So first off, you know Starlight Glimmer, Twilight Sparkle's newest student? Yeah well, turns out she's the biological sister of the princess of friendship. And if that shocked you, trust me, it shocked the rest of us too.

So Starlight went around telling everypony about her newly discovered relationship with Twilight. Starting with Twilight's friends who all fainted at one point or another. Starlight then moved onto telling Trixie who took it rather well. The two then told Shining Armor who...surprisingly also took it rather well? I guess he saw the signs at the crystal empire or something.

Moving on, the two sisters told Sunburst next who was Starlight's first friend, and he took in stride. Guess him not knowing Twilight made the whole thing easier for him to handle. Cadence was next, and according to Twilight, she made Starlight do the ladybug dance. I wish I had went to see it. I bet it would've been hilarious to watch Starlight do that silly dance.

Once in canterlot, the two sisters told Celestia and Luna first who both took the news very well. I don't know why everyone was just so non-chilant about it. I guess it might be because everyone thought Starlight acted enough like Twilght's Sister beforehand or something.

...I think I just heard Starlgiht yell "OH COME ON" just now. They told Moondancer next, and she's come by to visit from time to time, but me and the crusaders have been busy whenever she visited. There was one point however where Starlight left to her old village and when she came back, the changelings had returned and replaced everyone of importance. With help from Trixie, Discord, and the new changeling leader Thorax, the changelings were reformed and Chrysalis was defeated again; thus saving the day as per usual.

But yeah. Starlight actually saved the day. Same with Trixie and Discord too. There was even a party a few months ago because of it. Fun times. Anyways, a couple of days ago was the annual Sisterhooves Social event. And despite being new, Starlight and Twilight didn't just beat me, my friends, and our sisters...they won the whole thing. And now because of a bet me and the rest of the CMC made, we now have to do research on our family trees. Though Apple Bloom just tempted fate.

She said there was no way another bombshell like Starlight's could possibly happen. I should mention that while I don't think I'm biologically Rainbow Dash's sister, she has been both a good mentor and a great surrogate sister to me. I think I'm almost to the point where I can fly on my own. And it's all thanks to my mentor and surrogate sister Rainbow Dash.

I mean, there's no way I could possibly be related to Rainbow Dash right? ...Right? I'm not tempting fate here am I?

I'm totally tempting fate here, aren't I? Famous last words...in I go to the lion's den. Here's hoping I come out the same way I went in. Also famous last words am I right? If I don't come out the same way...then it was nice knowing everyone and it was fun while it lasted. I had a good run, but here I go. No turning back.

...

...

I tempted fate didn't I? Be honest. Because lying is so not cool.

Chapter 1 - Adopted Scootaloo

I arrived at the clubhouse ahead of the others. I had testing of my DNA to do against that of my parents. After all, gotta start with the family I do know, right? After all, what good is it to map out my family tree if I don't start with my parents. Just need to do some testing real quick...

While I wait for this test to process, how about I tell you a small story in regards to when we showed Starlight the CMC clubhouse which wasn't that long after she and Twilight came back from Canterlot?

There me and my best friends were guiding Starlight to our clubhouse.

"So is there a reason you are inviting me to your clubhouse?" Starlight asked us.

"Well even though you already have your cutie mark, Apple Bloom, Scootaloo and I all discussed certain things..." Sweetie Belle said.

"And we came to the conclusion that since your now a sister of the elements like the three of us..." I said.

"That you should be an honorary Crusader. Just so long as you help us out when we deal with helping other ponies find their true talents." Apple Bloom said.

"That's awefully nice of you three...but aren't I a little old to be hanging out with you five fillies?" Starlight asked.

"Hey, if you hang out with us, then Applejack and the others can stop worrying about us needing adult supervision all the time." I said.

"I guess I can handle that." Starlight said smiling.

"Besides, maybe it'll get my mother to lay off me. With you being the sister of the princess, maybe she'll stop yelling at me." Diamond Tiara said. Silver Spoon glanced at her best friend.

"She's still yelling at you?" Silver Spoon asked.

"Yeah. Still not sure why daddy hasn't divorced her yet." Diamond Tiara said.

"So you call your father daddy, but you refuse to call Spoiled Rich mommy..." I said.

"Until she starts acting more like my mother and starts supporting my decisions, she is getting no 'mommy' comment from me." Diamond Tiara said. "Which is why if I get a child of my own, I'll make sure to support their decisions and let them become their own person. I won't care what kind of friends he or she makes; so long as they are real friends like the four of you girls are for me.' She explained.

"That's surprisingly nice of you to say, Deets." Apple Bloom said. Diamond Tiara blushed.

"It...it's nothing Apps..." Diamond Tiara said blushing. Her statement caused Apple Bloom to blush and me to look back and forth between the two.

"...Wait are you two...DATING?!" I exclaimed.

"Sort of..." Apple Bloom said.

"We're not dating dating yet. But we have agreed to see how strong we feel about each other for the remainder of our elementary school days. If our feelings persist into high school...then we'll start dating dating." Diamond Tiara said.

"Do you think your mother will..." Sweetie Belle was about to ask before I stopped her with a hoof to the mouth.

"I don't think Diamond cares what her mother thinks anymore." I said.

"Thanks for the assist Scootaloo." Diamond Tiara said, smiling.

"Hey, what are friends for right?" I asked.

What else would friends be for then to support each other. I don't care if Apple Bloom and Diamond Tiara actually hook up with one another. Their both my friends, and I'll support them no matter what. Oh hey, the test is done. I go to check them. When I see the results, I let out a high pitched scream and faint.

A few minutes later, my friends all burst through the door, Starlight is there too.

"Scootaloo, what's going on?" Starlight said. Suddenly Applejack showed up.

"...Starlight why are you here?" Applejack asked. "Actually, answer that later. Scootaloo, why'd you scream so loud sugarcube? I heard your scream from all the way out in the southern orchard; and that's the furthest orchard from the clubhouse!" She said to me.

"My family test..." I said.

"Pardon?" Applejack was confused.

"Did you girls decide to check your family trees after what occured with me?" Starlight asked.

"It was my idea. Figured it'd be a fun bounding activity we could do together." Diamond Tiara said.

"But right now, none of the four of us who were outside had anything major to reveal." Silver Spoon said.

"So it's leaving Scootaloo as the last potential for a bombshell..." Sweetie Belle said.

"But really, what are the chances of that?" Apple Bloom asked.

"What did I say about tempting fate, Apple Bloom?!" Diamond Tiara exclaimed.

"Let me see those test results..." Starlight said. She gasped. "...ZERO PERCENT PROBABLITY?!" Starlight said.

"This is all too familiar..." Silver Spoon said.

"SEE APPLE BLOOM! YOU TEMPTED FATE AND NOW WE FIND OUT THAT SCOOTALOO IS ADOPTED TOO!" Diamond Tiara yelled.

"Diamond Tiara, I have have half a mind to..." Applejack said.

"She's right..." Apple Bloom said. Applejack blinked.

"Come again?" Apple Jack asked.

"Ah tempted fate too much...and now ah have to deal with the consequences." Apple Bloom said.

"Technically Scootaloo has to deal with the consequences..." Starlight said.

"Seriously, why is she here?" Applejack asked.

"We'll tell you later...but right now I guess we need her help as now I need that test she did for herself." I said.

"Actually it's not that long of a story: They just figured since I'm Twilight Sister I should hang out with them whenever I want." Starlight said. "And even made me an honorary Crusader." She added.

"Well...I guess in that case, I can overlook ya'll not telling me. At least Starlight is responsible." Applejack said.

"So can she help us set up the test for me?" I asked.

"Sure thing sugarcube." Applejack said, smiling.

Chapter 2 - The Big Reveal

Now with Applejack's permission, we can get started on that test that Starlight made.

"No matter who comes up Scootaloo, I want you to promise me you won't be upset with them." Starlight said.

"I don't know if I could ever be upset with someone. Could even be someone super awesome and amazing." I said.

"Well I can safely rule out any of the five of us as being potentially your true family." Diamond Tiara said.

"Double on you, Diamond Tiara. Friends or not, I would never be able to live with being associated with your mother." I said.

"At least that we can both agree on. Hell, I'd probably run away from Ponyville with you and the rest of our friends if there's a universe out there where we're friends and also sisters. The less I have to spend around my mother the better. And I wouldn't ever let you get put into her grip." Diamond Tiara said.

"That actually is pretty deep. Makes me wonder if there is some crazy universe like that." I said.

"Oh god my brain..." Silver Spoon said.

"Chill Silver Spoon; it's a hypothetical thing. No offense Scootaloo, but I hope there isn't a universe where we are biological sisters. Heck, not even just biological, a universe where you get adopted by my parents." Diamond Tiara said. "Now that one...that one I know for sure I'd run away from home with you in." She added.

"You know something Diamond? Maybe I misjudged you before I started giving you a chance to be a true friend. If you want, I'll let you call me Scoots like my friends do." I said. Diamond shook head.

"No. That's something I won't take away from your best friends. Doesn't feel like I've fully earned it yet." Diamond Tiara said. I smiled.

"Gee Diamond...you really wanna feel like you've earned that right if your that passionate about it." Apple Bloom said.

"Thanks Bloom." Diamond Tiara said. "I don't want it handed to me. I wanna feel like I've earned it. For once in my life, I wanna feel like I've earned something." She added.

"Well whenever your ready, you have my permission Diamond Tiara." I said.

"Good to know ahead of time, Scootaloo." Diamond Tiara said. "So thanks for that." She added.

"You five sure are moving past your differences." Starlight said.

"We're friends now. And friends look out for each other." I said. Suddenly the test results came in. "Oh boy I can't wait, who is it? Who is it?!" I ripped the results out of Starlight's hooves. And was stunned.

"...Who is it? Don't keep us all in waiting Scoots." Silver Spoon said.

"Um...Scootaloo?" Starlight took the results back from me. "...Huh...interesting..." She said.

"Well? Who is it?" Sweetie Belle said. "Better not be Blueblood..." She added.

"No, thankfully not him. Whoever that is." Starlight said. "Her closest living realtive; with a one hundred percent probabilty; is the element of loyalty herself, Rainbow Dash!" She announced. The room fell silent. "...Um...what's wrong?" She asekd.

"Oh my gosh..." I said slowly. But then burst with excitement and starting flying all over the room. "OH MY GOSH OH MY GOSH OH MY GOSH OH MY GOSH!" I yelled.

"Sc-scootaloo..." Diamond Tiara said.

"What?" I asked, hovering in place in the air and not knowing.

"You...your flying..." Diamond Tiara said. As soon as she said that, I noticed.

"OH MY GOSH OH MY GOSH OH MY GOSH OH MY GOSH!" I yelled as I started doing more flying around the room.

"Huh...apparently that news was so great to her that she's managed to start flying." Silver Spoon said.

"NOT IMPORTANT!" Sweetie Belle said. "Well...okay yeah it is important but...that's not the most shocking revolation..." She added.

"Then what is?" Starlight asked.

"That Scootaloo is Rainbow Dash's biological sister when they've been surrogate sisters this whole time." Apple Bloom said.

"...And here I go..." Starlight said but instead of fainting... "Wait, your not upset?!" She exclaimed.

"No! In fact I'm thrilled! I can't wait to tell her! I wonder how she'll react!" I said and opened the door and flew out.

"...Gah! Wait for us!" Diamond Tiara exclaimed.

BEST. NEWS. EVER!

Chapter 3 - Biological Connection

Author's Note

Another tittle drop in the middle of a story when it's not even the final chapter. At least this one warrants it.

Chapter 3 - Biological Connection

I finally arrived to where Rainbow Dash was.

“RAINBOW DASH!" I yeleld out as I flew towards her.

"Whoa!" Rainbow Dash said and joined me in the air. I stopped before I collided with her. "Well lookie here squirt: Your actually flying. All that mentoring paid off dividends huh?" Rainbow Dash asked.

"Yep. And I have you to thank for it, sis." I said. My friends and Starlight soon joined me.

"Think nothing of it, Scoots. I'll still be here if you want lessons and as your surrogate sister." Rainbow Dash said.

"Actually Rainbow Dash, that's why I came to see you." I said. "I just did some testing...there's a one hundred percent chance I'm your biological sister." I added.

"Hey Sweetie Belle, twenty bits says Rainbow Dash is gonna flee." Diamond Tiara said.

"I bet thirty she's gonna go either gonna go into panic mode or Scootaloo just broke her." Sweetie Belle said. Rainbow Dash instead just closed her eyes.

"Bucking finally..." Rainbow Dash said, surprising everyone.

"What?!" Both Diamond Tiara and Sweetie Belle exclaimed.

"Do you know how hard it is keeping a promise to one's parents about your relationship with a foal who looks up to you like a big sister when they have no idea?" Rainbow Dash asked, opening her eyes. "Because that's what they did: They made me promise to to say a word and let Scootaloo find out on her own." She said. "Yeah, I knew the whole time, but I couldn't say anything. Because you know, Loyalty. Trust me though, I was half tempted to just say 'buck the promise' and be there for my little sis more then my parents. I'm just relieved I can finally stop worrying so much. In fact, I was considering telling Scoots first thing tomorrow." Rainbow Dash said.

"That's okay big sis. It's fine. I don't mind." I said. Rainbow Dash blinked.

"You mean your not mad at me?" Rainbow Dash asked.

"I could never get mad at you. You've already been a big sister to me this whole time in your own secret way of doing so. That doesn't have to change. You just don't have to hide our biological connection now." I said.

"Heh...that's a big relief. I thought you might get mad at me keeping a secret like that." Rainbow Dash said.

"It's not your fault." I said. "But you do know whose fault it really is for making you promise and thus keeping our connection a secret." I added.

"I guess we're on the same wave length then: It’s my parents that deserve your anger. Not me." Rainbow Dash said.

"Their my parents too you know." I said.

"No their not." Rainbow Dash said.

"Huh?" I was confused.

"They don't get the right to call you your daughter. Not after making me promise to hid our biological connection to you." Rainbow Dash said. "The ponies who raised you? Their the the only parents that get that right. They were more loyal to you then my parents ever were." She added.

"But what about us being Biological sisters?" I asked, I was confused more now.

"I never said that I didn't accept that. When you asked me to mentor you, I jumped at the chance. Because that way I could treat you like the little sis you were to me from that point onward instead of treating you as just a fan. And I did a pretty good job at being your big sis too, didn't I Scoots?" Rainbow Dash asked.

"You've got a point...you did practically treat me like your little sister while still keeping the promise to your parents..." I said. I was getting it now.

"And that's not gonna change squirt. Even with you finding out the truth. I just no longer have to be careful about slipping up and telling you myself. But hey, that means I fulfilled my promise to my parents. For what that's worth." Rainbow Dash said.

"So I can still call you my big sis right?" I asked.

"So long as I can call you my little sis." Rainbow said. I smiled.

"I can live with that sis. But...I am going to have to step down." I said.

"Step down? Step down from what?" Rainbow Dash said before realizing. "Oh...that..." She added.

"Huh?" Starlight was confused.

"Scootaloo is the president of the Rainbow Dash fan club." Apple Bloom said.

"Soon to be former..." I said. "It wouldn't be right for me to be the president of my own biological sister's fan club." I added. "It's the right thing to do. Besides, I no longer need to run the club." I finished.

"Oh really? Why's that Scoots?" Rainbow asked me.

"Because I'm hoping that once I'm old enough, I'll join the wonderbolts alongside you." I said. Rainbow Dash smiled.

"I'd like that." Rainbow Dash said.

"Even if you never let me see my biological parents, I at least have you big sis." I said.

"Thanks squirt. I'm glad you accept me as your biological sister." Rainbow Dash said.

"Hey, I can be loyal too." I said, smiling.

"Heh...feels like we could do what my parents couldn't for you for when we have children of our own." Rainbow Dash said.

"You bet: Loyalty to family all the way." I said and hugged my big sis. "I love you big sis." I said.

"I love you too, little sis." Rainbow Dash said. Oh my gosh she actually said she loves me.

BEST. DAY. EVER!

Episode 4 - Telling the Main 6

Something has gone wrong. We don't seem to have an archived copy of that chapter.

Chapter 5 - True Parents

Since it was getting late, it was time for everyone to get home. Rainbow Dash came with me to my house since I wanted to tell my adopted parents about my biological connection.

"You sure you want to be here with me when I tell them?" I asked Rainbow Dash.

"Yeah. Besides, I want to meet the ones who've been raising you all this time as I've never met them." Rainbow Dash said.

"Welp, then here goes nothing." I said and knocked on the door. A female pegasus and a male earth pony soon opened the door.

"Scootaloo...what's Rainbow Dash doing here with you?" My adoptive mother asked.

"Now sweetie, remember Rainbow Dash is old enough to make her own decisions." My adoptive father said.

"...Hey dad...hey mom...can me and Rainbow Dash come in?" I asked.

"Sure thing sweetie." My mother said and we headed inside.

"I noticed you've finally started flying. First your cutie mark, and now your flying. So proud." My father said.

"It's thanks to Rainbow Dash's teachings. She's been such a good mentor to me. But that's not the main reason she's here with me today." I said. I sighed. "Oh boy...I thought I had my nerves in order to say this...but..." My mother stopped me.

"I think I can guess then. You finally found out you were adopted by us and discovered Rainbow Dash to be your biological sister, didn't you?" My mother asked.

"...I'm guessing you met them then. My biological parents." I said.

"And here I was ready to give the promise speech again..." Rainbow Dash said.

"Funny you should mention a promise...because your real parents..." My father said but I cut him off.

"Mommy, daddy...my big sis Rainbow Dash made it clear to me that my biological parents don't deserve to call themselves my parents. They lost that right. And I agree with that statement. As far as I'm concerned, you both are my real parents. Because you practically raised me as your own daughter and have treated me very well in that regard. So I guess the bottom line here, is that my real parents are you two. It's always been you two. And that will never change." I said. "...I hope that wasn't too sappy..." I added.

"Nah. That was fine little sis." Rainbow Dash said. I smiled.

"Thanks big sis." I said.

"But let me guess: They made you promise not to tell Scootaloo and let her find out on her own just like they did to me?" Rainbow Dash asked.

"...Guess we don't need to give a speech after all..." My father said.

"Figures..." Rainbow Dash said. "Seems I'm the only one of my family who was loyal to Scoots as best as I could be without breaking the promise to my parents. Though I'll be honest, I was very close to doing so anyways. Because seriously, buck that promise. My little sis deserved to know." She said. "I am glad she found out on her own though. And thankfully I don't think it changes that much between us. Sure, I'm still going to treat her like my little sis, but I can be a little more of myself around Scoots now." Rainbow Dash explained.

"And we thank you so much for agreeing to take Scootaloo under your tutelage. Clearly it's paid off dividends." My mother said.

"She came to me about it, actually." Rainbow Dash said. "So I chose to accept that role for her because it would allow me to be the big sis I wanted to be to her without breaking the promise to my parents. I wish she had found out before getting her cutie mark instead of after. But oh well. At least now I can better train her." She said.

"But aren't you a Wonderbolt now Dash? Do you really think you can manage?" My mother asked.

"Hey I can fly now remember? I doubt Spitfire or anyone related to the wonderbolts would stop me from seeing my big sis every now and again." I said.

"That's a good point...well made dear." My father said.

"You'll have to wait a few weeks for Spitfire to put you on the biological family list so security doesn't get on you by accident first squirt." Rainbow Dash said.

"There's a list for that sort of thing?" I asked.

"Surprised me too, I know." Rainbow Dash said.

"Well one day, I hope to become a Wonderbolt too. And I will do my best to get in." I said.

"That's the spirit sis." Rainbow Dash said and we hoofbumped.

"Ah...our little filly is growing up..." My mother said.

"But we couldn't be more proud of you, Scootaloo." My father said.

This has been THE BEST DAY EVER!

Epilogue: Sisters till the end

I was waiting for wonderbolt practice to finish today so Rainbow Dash could train me a bit. It's been a few weeks since we discovered our biological connection. In that time, not really a lot has happened to me and my friends. In fact, nothing really changed for all of us.

"Guess that's a testimate to how much me and Rainbow Dash already felt like sisters..." I said. Suddenly I noticed Spitfire come up to me.

"Scootaloo right? Rainbow Dash will be here shortly." Spitfire said. "Heard from your big sis that your gonna start training to be a wonderbolt even though your not old enough for it yet. I like your gumption kid." She said. Suddenly Rainbow Dash entered.

"Thanks for waiting little sis." Rainbow Dash said. She was still in uniform.

"So that's what you look like in your wonderbolt uniform. It makes you look at least 20% cooler big sis." I said.

"Gee...thanks for that." Rainbow Dash said.

"You two really are sisters. I almost swore that she sounded just like you, Flier." Spitfire said.

"Tell me about it. I think I've rubbed off on her from all that time I spent with her when she didn't know." Rainbow Dash said. "Speaking of...Spitfire, wanna help me train Scoots today?" Rainbow Dash asked. Is she seriously asking? Of course Spitfire is going to...

"I don't see why not. I want to see what she's capable of right now though." Spitfire said.

"OH MY GOSH OH MY GOSH OH MY GOSH OH MY GOSH!" I was gushing now, zooming around the room in excitement.

"...Yep...totally your biological sister..." Spitfire said.

"Sisters until the end I say." Rainbow Dash said.

She would be right. We would be sisters till the end.

Eight years have passed since then. Spitfire is on her last year as Captain with Rainbow Dash set to take her place. And me? I'm only in the Wonderbolt Reserves right now, but with my big sister's training regimen and some help from Spitfire, I think I'll be a full fledged Wonderbolt before the year is through.

And all the while, I'll have my big sis with me until the end of time. Life could not be anymore awesome right now.

Actually it can get more awesome: One of my friends is about to get married next month. I honestly couldn't be happier. Actually three of my best friends are getting married next month. All in one big ceremony for the entire foursome. Huh? What is it only a foursome if three of my friends are getting married? Well...I guess you'll have to wait until next month.

TO BE CONCLUDED IN SUDDENLY SISTERS 3: LOOSE ENDS

Author's Note

I know the epilogue is short, but I wanted to end this whole thing off on a positive note. And before anyone asks, yes my decision to ignore Rainbow Dash's parents inclusion in this is deliberate and I have no plans on backing down from that. So don't ask me to include them because I won't. If you harass me about including them, I can and will disable the comments for everyone so don't be that guy that ruins it for everyone else. Also, sequel hook!