A different sibling's wedding

"Mares and gentlecolts, we are gathered here today to witness the union of Princess Mi Amore Cadenza, and Twilight Sparkle." Celestia's muffled voice could be heard beneath the Canterlot caves, as Shining and Cadance ran into a dead end.

"Oh... We're never going to save her!" Cadance lamented.

"We will! We just have to find... there!" Shining cried, as he teleported himself and Cadance to an upper platform with an entrance to the surface.

However, they would find that company would greet them shortly...

"You're not going anywhere..."

Later...

"Princess Cadance and Twilight Sparkle, it is my great pleasure to pronounce you-!"

"STOP!!!"

Everypony gasped in shock, as the captain had once again come between his sister and her "true love".

"Ugh! Why does he have to be so overprotective of his little sister?! "Cadance" complained, causing Celestia to look at her niece concerned.

"Why does he have to ruin my special day?" "Cadance" rephrased it while "sobbing".

"Because, it's not YOUR special day, IT'S MINE!!!" Cadance announced, causing several ponies to gasp in shock and horror.

"What?! But HOW did you escape my bridesmaids?!" "Cadance" questioned the ponies.

Earlier...

The three brainwashed bridesmaids cornered the captain and the princess, but Cadance picked up a bouquet and levitated it near them, grabbing their attention, she then tossed it into the caves.

"I WANT IT!!!" The three unicorns exclaimed, as they leaped towards where the bouquet was thrown.

Shining Armor and Cadance then made their way to the surface.

Currently...

"Hmph. Clever, but you're still too late!"

"I- I don't understand! How can there be two of 'em?"

"She's a changeling! She takes the form of somepony you love and gains power by feeding off your love for them!"

Enraged, and out of lies and tricks to save her stolen skin, Chrysalis shed her disguise and revealed her true form to everypony, as she laughed maniacally.

"You are right Princess, but I'm not just any changeling...... I am Chrysalis! Queen of the changelings! And it is up to me to find food for my subjects, Equestria has more LOVE then anyplace I've EVER encountered. My fellow changelings will be able to DEVOUR so much of it, that we will gain more power then we've ever DREAMED of!"

"They'll never get the chance! Shining Armor's protection spell will keep them from ever even reaching us!"

Chrysalis merely chuckled evilly.

"Oh? You mean the protection spell he was unable to perform after being trapped in the caves? THAT protection spell?"

Cadance could only recoil in horror, as Shining indeed couldn't keep his grip on the spell after being out of distance from it for so long...

"Ever since I took your place, I've been feeding off Twilight Sparkle's love for you. Every moment she grows weaker, while my minions chip away at your precious barrier."

The ponies looked outside to see an army of insectoid like creatures banging away at the shield, as Chrysalis laughed maniacally.

"She may not be my wife, but she is under my TOTAL control now!"

Cadance gasped in horror.

"And I'm sorry to say, unable to protect Equestria as the ELEMENT OF MAGIC!"

"Not my Twilight Sparkle!" Cadance cried.

"Soon, my changeling army will break through! First, we take Canterlot! And then, ALL of Equestria!"

"NO... You won't." Celestia stood up to the changeling queen.

She had hurt her most faithful student, somepony she was about to welcome into her family, and one of the ponies she most closely adored...

And now, she was going to make her PAY.

"You may have made it so that Shining Armor was unable to perform his spell, but now that you have so foolishly revealed your true self, I can protect my subjects, from YOU!" Celestia declared, as she fired her magic at the overgrown cockroach, to which she fired back.

For a second, it seemed like Celestia would be able to win, but Chrysalis's magic soon found itself overpowering hers...

As she gasped in horror, she was struck back by the changeling magic, as she fell to the ground weakened.

Everypony gasped in horror at the fall of their beloved Princess.

"CELESTIA!" Shining Armor cried, as he and Twilight's friends rushed over to help her.

Chrysalis blinked in confusion, before realizing the reason for her victory.

"Ahh! Twilight Sparkle's love for you is even stronger then I thought, consuming it has made me even more powerful then CELESTIA!"

"Princess, what do we do?..." The captain asked his superior...

"Without Twilight... the elements cannot be used... I don't know..." Celestia weakly stated, as the shield begun to collapse, and the changelings surrounded and attacked the capital.

"You know, Shining Armor was suspicious of my behavior all along... Too bad the rest of you were too busy caught in your wedding planning to realize those suspicions were correct! Hah ha ha!" Chrysalis mocked the ponies, as she flew over to the window to observe the destruction.

"Sorry Captain, we should've listened to you."

"It's not your fault, she fooled everypony."

"But it IS our fault! You knew something was up with Cadance from the start, and we didn't listen!" Fluttershy exclaimed.

"You're Twilight's brother. You always know what's best for her, and you know how to protect her..." AJ stated.

"Well, I couldn't protect her today..." Shining Armor teared up, staring at his brainwashed sister.

Cadance gazed at her hypnotized fiance, before walking over to her and trying to snap her out of it.

She embraced her with a hug, before a spark of her horn begun to form a heart.

It touched Twilight's head, and she was freed from her enchantment, as she rubbed her forehead.

"Wha-... Is the wedding over?" Twilight was confused, while Cadance and the others were delighted.

"It's ALL over!" Chrysalis boomed.

"Wha-?! Shining Armor! Perform your spell!" Twilight cried to her brother, but Chrysalis merely laughed.

"What good would that do?! My changelings already roam free!" Chrysalis laughed, as she pointed at the parasitical invasion happening outside.

"No! I have to stop this... I have to... I must... I'm too weak..." Twilight cried, as she tried to do the spell herself but was weak from Chrysalis's brainwashing.

"My love will give you strength." Cadance stated, as she grasped Twilight in a tight hug.

"Hah hah ha! What a lovely yet absolutely RIDICULOUS sentiment." Chrysalis merely mocked, as Twilight stared with contempt.

But then, Cadance and Twilight's horns begun to share their magic.

It started as a small spark, but then it ignited into an aura that eventually engulfed them both.

They both looked surprised at first, but then decided to just accept it.

Her friends and brother all looked with adoration as they saw the brides finally re-unite.

Chrysalis turned around and saw what was happening, as her jaw dropped in shock.

Eventually, the love Twilight and Cadance had for each other was so powerful it created a wave of magic that blasted all of Canterlot.

"NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!" Chrysalis screamed in fury, as she was sent flying from Canterlot.

Eventually, the other changelings followed suit, as they too were sent packing along with their queen, all the way back to the changeling kingdom.

As gravity affected Cadance and Twilight again, they hugged in loving embrace.

Shining Armor rushed over to Celestia to help her up.

"I'm sorry..." Shining Armor apologized for earlier.

"You have nothing to apologize for, you were determined enough to protect your sister from harm, and was resilient enough to bring the real Cadance back to us. That is a sign of a true big brother." Celestia assured, as the captain's cheeks begun to rise.

"Now, without further ado, you have a real wedding to put together." Celestia stated, as Twilight's friends went to prepare the wedding for real...