It's been weeks since brother's day and we see Sonic and the mane six having a picnic.
"It sure is nice out today isn't it?" Sonic asked.
"Simply gorgeous." Rarity replied.
"Good call on having a picnic today Twilight." Sonic said.
"I just figured we'd spend some time together seeing how busy we've been lately." Twilight responded before asking, "Wait, where's Spike?"
"He said something about checking how much gems he had left." Sonic said.
"Hopefully he gets here soon, it's too good a day to pass up on."
"Twilight!" called a voice.
The group looks in the direction the voice came from and saw Spike running towards them.
"What's wrong Spike?" Sonic asked.
Spike was catching his breath before belching a letter.
Twilight picked up the letter and began to read it,
Dear Twilight, I am sure you are as excited as I am about the upcoming wedding in Canterlot.
"Wedding?" Sonic asked.
I will be presiding over the ceremony, but would very much like you and your friends to help with the preparations for this wonderful occasion. Fluttershy, I would like you and your songbird choir to provide the music.
"Oh my goodness! What an honor!" Fluttershy said.
Pinkie Pie, I can think of no one more qualified than you to host the reception.
"Yay!" Pinkie exclaimed.
Applejack, you will be in charge of the catering for the reception.
"Well, color me pleased as punch!" Applejack said.
Rainbow Dash–
Rainbow Dash interrupts by letting out a yawn.
...I would very much appreciate it if you could perform a sonic rainboom as the bride and groom complete their "I do"'s.
"Yes!" Rainbow Dash exclaimed.
Rarity, you will be responsible for designing the dresses for the bride and her bridesmaids.
"Princess Celestia wants me to– ...wedding dress? For a Canterlot wedding... I, ah, ooh, oooh!" Rarity said happily before fainting.
And as for you, Twilight, you will be playing the most important role of all: Making sure that everything goes as planned. See you all very soon. Yours, Princess Celestia.
"
But... I don't understand. Who's getting married?" Twilight asked as she finished reading the letter.
"Oh, I probably should of gave you this letter first." Spike said as he handed Twilight another letter.
"Let me see." Sonic said as he grabbed the letter and read it.
Twilight Sparkle, you are here by invited to the wedding of Princess Mi Amore Cadenza and Shining Armor.
"Congratulations on your brother's wedding Twilight." Applejack said.
"Oh this is nice." Twilight said before adding, "Only my brother sent an invitation instead of telling me in person! And who the hay is Princess Mi Amore Cadenza!?
"Uh, Twilight..." Sonic tried to say before he was interrupted by Fluttershy.
"Are you ok Twilight?" She asked.
"Sorry girls, it's just that Shining Armor is my BBBFF." Twilight said, only to earn confused looks from everyone except Sonic.
"It stands for Big Brother Best Friend Forever." Sonic explained.
"Ohhhh." The others said.
"Besides Sonic and Spike, Shining Armor was the only pony who I was truly friends with." Twilight explained, "He's also really special, not anypony can become captain of the royal gaurd."
"So let me get this straight. We're helping out with the wedding of not only a princess, but a captain of the Royal Guard?" Rarity asked.
"Looks like it." Sonic responded.
This caused Rarity to let out a cheerful squeal.
"Anyways, we better get to the train station if we plan on getting to the wedding." Sonic suggested.
"Can't you just use chaos control to teleport us over there?" Rainbow Dash asked.
"I would, but I think it's best if we process this new information for a bit." Sonic explained.
Before the group began to head out, Spike suddenly belches a package.
"What's this?" Sonic asked as he picked it up.
He then noticed a letter attached to it and read it to himself before sighing.
"What is it?" Fluttershy asked.
"I'll show you later." Sonic said, "I've got to look at this, I'll see you guys at the train station."
With that Sonic then runs off.
"What was that about?" Rainbow Dash asked.
"I don't know but let's just do as he says." Applejack said.
With that the mane six and Spike make their way to the train station.
Not too long later at the train station, everyone was waiting for Sonic to show up but Rainbow Dash started to become a bit impatient.
"What's taking him so long?!" Rainbow Dash complained.
"Relax Rainbow, whatever he had to probably won't take that much longer." Spike said.
As if on cue, the group spots a familiar blue trail heading towards them. When said trail stopped, they were hit with the harsh wind that was following it.
"Sorry for the wait guys, it's been a while since I put this on." Sonic said.
"Put what o-" Rarity was saying until she saw Sonic.
Said hedgehog was now wearing a red cape, a golden shoulder plate on his left shoulder, and a golden crown.
"Wow, I haven't seen you wear that in a long time." Twilight said.
"Well according to the letter, mom wanted me to look formal until the wedding was over so she decided to send my crown and cape." Sonic explained.
"You definitely accomplished that in my opinion." Rarity said.
"Hate to cut things short, but we have a train to get to." Twilight said.
"Right, let's go everypony!" Sonic exclaimed as the made their way to the friendship express.
About an hour later, while waiting for the train to arrive in canterlot, the group decided to discuss how excited they were for the wedding.
"My sonic rainboom is going to make this the best wedding ever!" Rainbow Dash exclaimed.
"You said it Dashie!" Pinkie said.
"Well me and Sonic are going to be in charge of the bachelor party!" Spike said before adding, "Question, what's a bachelor party?"
This caused everyone but Twilight to laugh, which Applejack noticed.
"What's wrong Twilight?" She asked.
"It's just that I haven't really seen Shining Armor since I moved to ponyville." Twilight explained," And now he's going to start a family with this Princess Mi Amore-whatshername. We might not see each other."
"Come on Twilight, he's your brother, he'll always make time for you."
"Well he didn't have the time to tell me he was getting married." Twilight huffed.
"Hey everyone, we're here!" Sonic exclaimed.
Everyone looked outside and saw canterlot come into view. They also noticed that canterlot had a large barrier around it.
Soon after exiting the train, the group notices a large presence of guards in the area.
"What's with all the guards?" Rainbow Dash asked.
"With the royal wedding coming up, they're most likely making sure no shady figures decide to show their faces." Sonic said.
"Well we better get going, we have a lot of work to do." Rarity said.
"That and you've got a big brother to congratulate." Applejack said, pointing towards Twilight.
"That, and give him piece of my mind." Twilight grumbled.
"Hey, there he is now." Sonic said while pointing towards the stallion in general.
Twilight immediately made her way towards Shining Armor while angrily yelling, "I've got something to say to you mister!"
The yell caused nearby guards to point their spears at her.
"Stand down." Sonic commanded, which causes the guards to do just that.
Shining Armor finally notices Twilight and calls out, "Twily! It's good to see you again. How was the train ride? I -"
"How dare you not tell me about your own wedding!" Twilight interrupted, "I'm your sister for pony's sake!"
"It's not my fault." Shining Armor said in defense, "The princess wanted an increase in security. Didn't you notice all the guards when you arrived?"
"I hear there's going to be big wedding, did you hear about it?" Twilight sarcasticly asked.
"Twilight, it has nothing to do with the wedding." Shining Armor assured, "A threat was made against canterlot, so Princess Celestia ordered an increase in security, haven't you noticed the large barrier around us?"
Shining Armor demonstrated what he meant by letting out a gasp and everyone notices the barrier weakening before it suppenly strengthens again.
"The burden of keeping canterlot safe and secure rests on me." Shining Armor explained, "Staying focused at the task at hoof has been my top priority."
"Okay I get it. You've had the very important job of keeping canterlot safe with a giant barrier only you can make, but still..." Twilight said, "How could you not tell me about something as big as your own wedding? Am in not important to you any more?"
"Hey you're my sister, of course you're important to me." Shining Armor assured, "But if you don't want to be best mare now..."
Twilight brightened the moment she heard that.
"You want me to be your best mare?" Twilight asked.
"Well ... yeah." Shining Armor replied.
"I'd be honored!" Twilight chirped, "But I'm still mad at you for marrying somepony I don't even know, and who is this 'Mi Amore Cadanza'?
Shining Armor chuckled, "Twilight, Mi Amore Cadanza is Cadence, you old foalsitter."
Twilight gasped, "Cadence? As in the Cadence? The best foalsitter in the history of foalsitters!?"
"You tell me, she was your foalsitter." Shining Armor said.
"I tried to tell her that earlier, but I was never given the chance to." Sonic said as he and the others came into view.
"Sonic! Long time no see!" Shining Armor said he and said hedgehog fist/hoofbumped.
"I trust you've been keeping the castle safe in hope." Sonic said.
"You bet your flank I have." Shining Armor replied.
"Sonic, why didn't you tell me Shining Armor was going to marry Cadence, your cousin?" Twilight asked.
"I just said, I tried to tell you but you and the girls never gave me the chance to." Sonic replied.
"Oh, right. But still I'm so happy for you Shining Armor." Twilight said before thinking something, "Oh! Sonic let's do the chant!"
"The chant? Why?" Sonic asked.
"I haven't done it for a long time now and knowing that I'll get to see Cadence again just make me want to do it!" Twilight chirped.
"Come on Twilight, is this really necessary?" Sonic asked.
"Please!" Twilight said while giving Sonic puppy-eyes.
"Fine." Sonic sighed.
"Yes!"
The two stood before each other before they began to sing, "Sunshine, sunshine, ladybugs awake! Clap your hooves and do a little shake!" As they sang they did a couple of gestures before ending it off by shaking their flanks (butt in Sonic's case).
"And you say I need to grow up sometimes." Sonic said.
"I hope I'm not interrupting anything important." Said a voice.
When everyone looked in the direction the voice came from, they saw the mare of the hour herself, Princess Cadence.
"Cadence!" Twilight exclaimed as she ran towards said mare.
Once Twilight reach her she began to do the chant.
"What are you doing?" Cadence asked.
"Cadence it's me, Twilight." Twilight said.
"Uh-huh." Cadence said, seemingly uninterested.
"Hey cuz, long time no see." Sonic said.
"Cuz?" Cadence asked.
"Come on Cadence, it's me, Sonic." Sonic said but go no response, "Your cousin?"
"Oh right I remember now, sorry it's been a while." Cadence quickly said.
"Right." Sonic said before thinking to himself, 'Somethings not right here.'
"Anyway, I've got to go back to my station, but Cadance will be checking in with all of you to see how things are going. I think I speak for both of us when I say we couldn't be more excited to have you here. Right, dear?" Shining Armor asked.
"Absolutely." Cadence responded.
"Well I'll leave you to it." Shining Armor said before making his leave.
When the group left to do their thing, Twilight walked alongside Sonic and asked, "Is it just me, or is Cadence acting weird?"
"You're not the only one." Sonic responded, "Cadence is always up to chant with you and last time I checked, she isn't the forgetful type, especially when it involves us."
"You've said it."
"How about this? We keep an eye on her for a while, and if we see something weird happen, I tell either Shining or my mom about it. They'd have to believe me since, well can you think of a time I lied to anypony."
"Almost never."
"My point exactly." Sonic said.
"Okay, we better get going, we wouldn't what her to suspect anything." Twilight said.
With that the duo part ways but remained alert whenever Cadence was around.
As the day went on, Sonic and Twilight became more and more suspicious of Cadence due to her actions.
What caused the most suspicion between the two was when Cadence yelled at Spike. The two of them knew the real Cadence would never raise her voice to a child, let alone Spike. When Sonic saw this, he looked calm on the outside but on the inside, he was furious and he let it out as soon as he and Twilight were alone.
After calming Sonic down, Twilight decided it was time to tell the others, but even after explaining how trustworthy Sonic was, the others were skeptical of their suspicions.
After that failed the duo decided to talk to Shining Armor about their suspicions.
As they were on their way to his house, Sonic (who was no longer wearing his crown and cape) tried to calm down a fuming Twilight.
"I know that you're angry Twilight but can you blame them?" He asked, "They don't know Cadence as well as we do, of course they'd be skeptical."
"Yeah, but after telling them you would always make sure something was true before warning somepony about something, they still didn't believe us." fumed Twilight.
"Let's just focus on telling Shining Armor what we learned." Sonic said.
"Whatever you say Sonic." Twilight responded.
The duo soon reach Shining Armor's home and noticed the door was slightly open. Just as Twilight was about to barge in, Sonic stopped her.
"Hold on Twilight," whispered Sonic, "It sounds like Shining Armor is talking to somepony in there."
When the two looked through the crack in the door, they saw that Shining Armor and Cadence were the ones talking.
"I thought I told you not to wear that crest." Cadence said.
"But this is my favorite uncle's." Shining Armor said back.
"And?"
"Are you disagreeing with me?" Cadence sternly asked.
"I guess I am - Gah!" Shining Armor said before Cadence placed her horn on his and it began to glow green.
"Headaches again? Here, let me help with that." Cadence said as the glow on her horn intensifies, causing to Shining Armor to gasp again.
"We've got to warn everyone about this." whispered Sonic as he and Twilight quietly leave.
As soon as they were far enough away, they began running back to the castle in an attempt to warn the others.
"I can't believe it, they didn't even listen to us this time?" Yelled an angry Twilight.
"Now hold on there Twilight, they were too preoccupied with the bridesmaids they didn't even know we were there." Sonic said, trying to calm her down.
Twilight remained unmoved for a moment before saying, "You're right, but how are we going to make them listen?"
"We just need them somewhere where they're all together, then we can warn them," Sonic began, "they may not listen to that much but I know my mom would. She knows me too well to think I'd make something up about something this important."
Twilight thought for a bit before saying, "Let's try at the wedding rehearsal tomorrow, I definitely know everyone will be there."
"Alright then let's do that," Sonic said, "but if I'm not there for whatever reason, try to explain on your own and stall for as long as you can, I'll hopefully make it there by then."
"Sounds like a plan, alright I'll see you tonight." Twilight said as she went to get room, "Goodnight Sonic."
"Goodnight Twilight." Sonic said as he made his way to his own room.
On his way he saw a guard suspiciously looking around before said guard went in the direction of Cadence's room.
"What's he up to?" Sonic said to himself as he silently followed him.
After a few minutes Sonic followed the guard until the said guard was outside Cadence's room. Sonic decided to play it safe and was hiding down the hall away from the room.
The guard then knocks on Cadence's door and waits for said mare to answer.
'If Cadence answers the door, I'll make my way over there and listen through the door.' Sonic thought to himself.
Before anything else could happen, Sonic is suddenly struck in the back of the head and is knocked out cold.
"There's no way I'll let you get in my way!" said an eerie voice.
The next day at the wedding rehearsal, everyone was already in position and just as Shining Armor and Cadence were about to practice their vows, Princess Celestia noticed someone was missing.
"Has anyone seen Sonic?" She asked.
Looking around Shining Armor then asks, "And has anyone seen Twilight?"
Just then, the doors magically burst open, gaining everyone’s attention, and Twilight walked in.
“I’m here,” she said angrily. “I’m not gonna stand next to her. And neither should you!”
Shining began to look slightly embarrassed as he turned to his fiance. “I’m sorry, I don’t know why she’s acting like this.”
“Maybe we should just ignore her,” Cadence said, agitated that Twilight was ruining her wedding reception for her.
“You have to listen to me!” exclaimed Twilight.
“Oh goodness,” said Fluttershy. “Are you okay?”
“I’m fine,” Twilight said, "but I’ve got something to say."
Everyone looked at Twilight, afraid of what the purple mare was about to do.
Twilight pointed at Cadence and blaintedly said, “She’s evil.”
Everyone was shocked. Shining Armor moved in front of Cadence protectively.
“She’s been horrible to my friends,” Twilight said. She then teleported behind Cadence. “I saw her put a spell on my brother that made his eyes go all-” Twilight rolled her eyes disorientedly to emphasise her point. Everyone looked at Cadence, shocked. Cadence smiled awkwardly, but stopped when Twilight got up in her face. Twilight smiled, sure that he had Cadence cornered. Princess Cadence looked at everypony...
...and began to sob. “Why are you doing this to me?” she exclaimed before running off.
“Because you’re evil!” Twilight yelled after her. Twilight teleported into the doorway and continued, “Evil! And if I don’t, you’re going to ruin my brother’s life!”
Everyone stared at Twilight, mouths hanging open.
Twilight proudly walked back into the room, only to bump into a very unhappy Shining Armor. Twilight smiled sheepishly at her brother, but he still gave her a death stare that could rival her own.
“You wanna know why my eyes went all-” Shining tried to repeat the motion Twilight had done, but ended up hurting himself instead. He shook himself off and continued. “Because ever since I started to perform my protection spell, I’ve been getting terrible migraines. Cadence hasn’t been casting a spell on me, she’s been using her magic to heal me.”
Twilight was about to ask about the bridesmaids, but Shining beat her to it. “And she decided to replace her bridesmaids because she found out the only reason they wanted to be in the wedding was so they could meet Canterlot royalty.”
“I was just trying to-”
“She’s completely stressed out because it’s really important to her that our big day be perfect!” exclaimed Shining, interrupting his sister. He turned around and said right into her face, “Something that obviously wasn’t important to you!” Shining barreled past her, stomping away down the hall and as far away from Twilight as possible. “You can forget about being my best mare! And If I were you, I wouldn’t even show up to the wedding at all!” And with that, Shining Armor left, leaving Twilight alone with the others. They all looked at her, appalled, until Applejack spoke up.
“Come on, y’all. Let’s go check on the princess.”
Everyone walked past Twilight, refusing to even look at her. Princess Celestia walked down the hall as well, and looked down at Twilight. The alicorn princess was flowing with disappointment and an upset energy was brewing within, all directed at Twilight as she said, “You have a lot to think about.” With that, Celestia departed as well without another word.
Twilight stood there, misty-eyed and horrified by these recent events. She was tearing up at the thought of what she had just done.
“Maybe I was being overprotective,” she said to herself. She walked over to the steps to the altar and laid down. “I could have gained a sister. But instead... I lost a brother. He was my big brother best friend forever, and now we’ll never do anything together.” Somepony walked up to Twilight and began stroking her mane. Twilight looked up and saw Cadence standing over her, a sympathetic smile stitched upon her lips. “Oh, Cadence... I’m so sorry...” wept Twilight.
Cadence’s eyes flashed green, taking a serpentine guise. Forest-green flames shrouded Twilight as Cadence coldly stated, “You will be.”
Twilight thrashed wildly as she phazed through the ground, as an evilly grinning Cadenza before walking out of the room like nothing happened.