"You could use some work on math and English, but you are doing great in both history and geography!" Twilight said happily while clopping her hooves together.

"Well, shucks. Thanks, Twi!" Applejack blushed a little. "But, when ya need to maintain a business, at least some knowledge is necessary! And yer not slackin' either. Ya were payin' attention to everythin' Ah told ya about safety when liftin' heavy stuff! Ya'll be applebuckin' in no time. Ah'm proud of ya, Twi!" Twilight smiled brightly.

"Alright, Rainbow Dash, this is the place. Land here!" Trixie said, pointing at the town below them.

Rainbow Dash descended and collapsed on the ground as soon as they landed, panting heavily. Applejack and Twilight went to her aid.

"Everythin' okay, RD?" Applejack asked, truly concerned.

"I'll... I'll live." she gasped. "Just... Tired..."

"See?" Trixie said. "If you had paid any attention, you would have noticed that the saddle wasn't fastened properly, which made the effort required to pull it much, much bigger!"

"Aw, come on..." she said. "Can't we stop training at least during a mission?"

"Everyone is always training, even if they are unaware of that! Now let's go!"

"Can't we... Rest for a bit? I'm dying..."

"Applejack, if you please?" Trixie said.

Applejack nodded and placed Rainbow Dash on her back. "Come now, Rainbow. Ah know ya were tricked, but we have a job to do. Rest well 'til we get there, okay?"

Rainbow Dash only nodded, her respiration now slowly returning to the normal rhythm.

* * *

A rowboat was waiting for them at the shore. Trixie stretched her forelegs and jumped it.

"Alright, Sparkle. You and me, rowing now!" she said, already holding one of the oars.

"You too, Trixie?" Twilight asked.

"I'm not weak but, compared to those two behind you, I could use some exercise. And so could you!" she threw the other oar at Twilight, but she didn't reacted in time and the oar hit her face. "Your reaction time needs some adjustments, too."

Twilight rubbed the sore spot, but didn't said anything. She just grabbed the oar from the ground and jumped in the rowboat, followed by Applejack and Rainbow Dash. Trixie and Twilight nodded at each other and started rowing.

"Row, row, row yer boat, gently down the stream~!" Applejack started singing.

"Merrily, merrily, merrily, merrily, life is but a dream~!" Twilight finished, and both mares started giggling. They stopped, though, when they saw Trixie glaring at them.

"This is not a camp trip." she said. "This is an important mission. Ponies are dependding on us, and I don't want us to fail because a couple of grownmares were too busy siging like a pair of foals!"

"Gee, no need to get all uppity, Trixie." Rainbow Dash said. "I mean, sure, we need to focus on the mission and all that, but--"

"And who are you to tell me about focus?!" Trixie nearly shouted, surprising all three mares.

"Uh... Ah think we should just shup our traps now..." Applejack said.

"Smart move! I guess you're not so dumb after all." Trixie said and Applejack gritted her teeth.

"Alright, that's it!" Applejack said, jumping on Trixie.

"APPLEJACK!" Rainbow Dash and Twilight yelled. They tried to get her off Trixie, but she was blasted away by a magic beam coming from Trixie's horn. She was thrown several feet up in the air, then into the water.

"What have you done, Trixie?!" Twilight shouted.

"I didn't killed her if that's what you think." Trixie said while getting up, brushing the dust off her uniform. "But I hope this will teach her some manners!"

"She's taking her time to come back, isn't she?" Rainbow Dash said.

Trixie shrugged. "If you ask me, I couldn't care less. Now get to rowing, Sparkle!"

The pegasus grabbed Trixie by the collar. "I'm not leaving my friend behind!"

"I could leave you behind as well as I can leave her."

"Then do that! I don't care! I'm going after--"

Twilight's ear twitched. "You two, keep quiet for a second."

Trixie and Rainbow Dash stopped talking, though Rainbow was still holding Trixie by the collar.

"Did you hear that?"

"I can't--"

"SHHHHHH!" Twilight closed her eyes. "I think it's... Singing! There's someone singing!"

"Yes, I can hear it, too!" Trixie said. "And it's awful."

Twilight grabbed a pair of binoculars from her saddlebag and looked around. She focused her sight on a rock and gasped.

"I... I found Applejack." she said.

"Where?" Rainbow Dash grabbed the binoculars and looked at the same rock, where Applejack was sitting down. There were three creatures around her, though: they were very tall and looked like dragons, though their lower half was like the one of a fish. The first was yellow, the second was purple and the third was light blue. They were all looking at Applejack and singing.

"What the hay are those things? And what are they doing to Applejack?"

"That's what I'm going to find out. Trixie, let's go check it out! They might be what we came here looking for."

"Whatever!" Trixie said before grabbing the oar.

But ainbow Dash couldn't wait and she took off, flying toward her friend and those creatures. She landed a kick on the yellow one's face, making her growl in pain and stop singing, then landed on the rock. The other two stopped singing as well, startled by the sudden appearance of a flying rainbow that attacked their leader.

"Hey, Applejack, are you ok?" she called, shaking her friend. The apple farmer's eyes were glowing green and she had a vacant look on her face.

"Rain... Bow..." she mumbled.

The yellow creature shook her head and screeched at Rainbow Dash, who didn't even flinched. She just flew and headbutted her.

"What have you done to my friend?!"

Trixie and Twilight finally arrived there and jumped off the boat.

"Sirens!" Trixie said.

"I read about them!" Twilight said. "They hypnotize others with their singing magic, correct?"

"Correct!" Trixie then charged a spell and shot at Rainbow Dash, who was still attacking them. The pegasus screamed in pain and fell on the ground.

"TRIXIE!" Twilight yelled.

"So, if you don't want to suffer the same fate, I advise you to leave." she smiled, her eyes flashing green.

She looked around. Applejack was still entranced, Rainbow Dash was nearly knocked unconscious and Trixie and the sirens were grinning evilly. She closed her eyes and sighed.

"I don't know when or how you magic got so powerful, Trixie, but..." she charged a spell. "...but I'm still the Element of Magic!"

Twilight's horn flashed a very bright light, temporarily blinding her foes. She immediately charged another spell, this time a magic beam.

"I know your weak spot!" she said before shooting her spell at the red gem on the yellow siren's chest. She shrieked and fell down. She repeated the process with the other two, who reacted in a similar manner. Both Trixie and Applejack lost their balances and fell, getting up soon after.

"Wha... What happened?" Applejack asked, then noticed the blue pegasus fallen next to her. "RAINBOW!"

"Hey, AJ..." she said. "Glad you're ok."

"Don't worry, Ah brought some bandages in mah saddlebag!"

"Sparkle." Trixie asked, rubbing her temples. "Care to explain what just happened?"

"Look behind you!"

She started to turn her head. "Or you could just tell me and WHOA!" she finally noticed the three sirens laying unconscious behind her. "Did... Did they...? Me... You know..."

Twilight nodded. "Sorry to say, but you even attacked Rainbow Dash while under their influence!"

"Crap!" she ran toward the fallen Rainbow Dash.

Twilight noticed a small amount of green smoke coming out of the holes on the sirens' chests. Soon that amount grew larger and their whole bodies exploded into green clouds of smoke. It didn't made her cough, though, and it soon dissipated. The giant bodies disappeared, leaving three smaller bodies on their places. They were all the same colors the sirens were, but they looked like a little different: their lower half was still fish-like, but their upper half were similar to a pony's. They also had a fin on their back, two under their bodies, one behind each hoof and pointier ears.

The yellow siren opened her eyes and got up, looking down at her smaller body. She growled at the ponies and tried to sing, but only a high pitched shriek got out of her throat, hurting her ears and forcing her to cover them with her hooves. She then began to panic "Huh? What? Huh?! My voice!!"

Trixie stepped in front of her, glaring at the siren. "I don't care who you are, you're under arrest!"

The four mares were waiting on top of the stairs that led to the dungeons of the Organization HQ. Trixie looked at Rainbow Dash, who had bandages wrapped around her midriff.

"How does it feel?" she asked.

"Not as bad as before." Dash explained.

"I am sorry for what I did. If there's anything I can--"

"Enough, Trixie! You've been apologized since I got out of the infirmary. It's okay, I forgive you! It wasn't your fault."

"Oh! O-Okay, just... Y'know... Checking."

Chief Harshwhinny finally got back up, her expression as serious as ever. But she wasn't alone.

"What are they doin' outta their cell?" Applejack asked, pointing at the three sirens behind Harshwhinny.

"Since you shattered the gems that gave them strenght, they are mostly harmless now." she explained. "So I made them an offer: I would release them if they joined our ranks."

"And why would you make that offer?" Trixie cleared her throat. "Ma'am!"

"Because this is an opportunity! They are sea-dwelling creatures that are capable of reasoning. I have never met any of those before. Think of the possibilities!"

"While I do agree that the possibilities are astounding, they were tormenting a city and hypnotized us. Surely you can't just brush it off!"

"Trixie, if I wasn't aware of what I'm doing, do you think I would still be Chief? Trust me, I know what I'm doing! And if they step out of line, then I'll take full responsability and deal with the consequences myself."

Trixie sighed and nodded. "As you wish, Chief."

"Good. Now..." she turned around to face the three sirens. "Don't you have something to tell those ponies?"

They all looked at each other, sighed and bowed.

"We're sorry!" they said at the same time.

"Good, good, very good." she turned back at the four mares. "And you, wait in my office. I'll be right there with your uniforms and your badges!"

Applejack, Rainbow Dash and Twilight smiled at each other, then jumped, high-hoofed and shouted:

"YEAH!!!"

"Ouch." Rainbow Dash said when they landed. "Still hurts."

Author's Notes:

This fanfic takes place in an alternate universe where Starswirl did not banished the sirens, and that tiny change of events in Equestrian history caused all sorts of changes in the main timeline - chances that will be shown right here, sooner or later!

And here's an example of a siren's true form in this fanfic: